Today's Message Index:
----------------------
1. 05:45 AM - Re: air system charging (Genzlinger, Reade)
2. 06:49 AM - Air (owner-yak-list-server@matronics.com)
3. 07:31 AM - Re: (A. Dennis Savarese)
4. 08:17 AM - Re: air system charging (AirshowPilot1@aol.com)
5. 08:22 AM - Re: A heads up (Terry Calloway)
6. 09:09 AM - Re: (Jim Ivey)
7. 10:10 AM - Re: HOME! (Barry Hancock)
8. 10:42 AM - Re: air system charging (A. Dennis Savarese)
9. 10:45 AM - Re: Re: (A. Dennis Savarese)
10. 11:52 AM - Re: air system charging (N4829T@aol.com)
11. 11:57 AM - Re: air system charging (Coffey, John)
12. 12:18 PM - Aux. air system charging (Wes Warner)
13. 12:56 PM - Luggage compartment (owner-yak-list-server@matronics.com)
14. 01:22 PM - Re: Aux. air system charging (Jim Ivey)
15. 02:04 PM - Hughes H-1B Crash! (Petri David S Contractor USNORTHCOM J3)
16. 02:15 PM - YPA Transitional Brief (Drew Blahnick)
17. 03:04 PM - Re: Hughes H-1B Crash! (William Halverson)
18. 03:15 PM - Hughes H-1B Crash! and YPA at OSH (Mark Schrick)
19. 03:18 PM - Re: air system charging (AirshowPilot1@aol.com)
20. 03:28 PM - Re: air system charging (AirshowPilot1@aol.com)
21. 05:15 PM - Re: Re: HOME! (Dee Grimm)
22. 05:58 PM - Tach Question (dabear)
23. 06:16 PM - Re: Tach Question (A. Dennis Savarese)
24. 06:29 PM - Re: Tach Question (Jim Ivey)
25. 06:45 PM - Re: Tach Question (Dee Grimm)
26. 10:12 PM - Re: Tach Question (Brian Lloyd)
27. 11:36 PM - Digital tach (Frank Stelwagon)
Message 1
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| Subject: | air system charging |
--> Yak-List message posted by: "Genzlinger, Reade" <ReadeG@Cairnwood.com>
This makes sense. I appears then that the slightest adjustment in start
timing settings can make quite a difference since my engine currently starts
well but will not start with N. I'll check it out. Thanks.
Reade Genzlinger
Cairnwood Cooperative Corporation
215.914.0370
215.790.6212 fax
readeg@cairnwood.com
-----Original Message-----
From: Brian Lloyd [mailto:brian@lloyd.com]
Subject: Re: Yak-List: air system charging
{SPAM?} Header
--> Yak-List message posted by: Brian Lloyd <brian@lloyd.com>
A. Dennis Savarese wrote:
> I am not questioning whether you have been successful starting your engine
> with nitrogen in the main air system. I'm sure you have. What I am
saying
> is that I have been unsuccessful starting the engine with only pure
nitrogen
> in the main air system. So for every person who has been successful, my
> guess is there are probably just as many unsuccessful attempts.
This is an engine timing issue. In an engine that is properly timed, the
engine will start just fine with N2 in the air system. The ignition timing
is supposed to be just before or at TDC. The starting air injection is
supposed to be substantially after that to ensure no chance of turning the
engine backward. So if the engine is properly timed, the burnable fuel-air
mix is already in the cylinder when the spark happens. If the cylinder
fires the pressure holds the check valve closed and keeps the starting
pressure air from entering the cylinder. If the cylinder doesn't fire, the
starting pressure air provides the force on the piston instead of the
burning gasses.
So if your engine will not fire when your air system is charged with pure
N2, you need to check the starting timing of the mags and check the timing
on the air distributor.
--
Brian Lloyd 6501 Red Hook Plaza, Suite 201
brian@lloyd.com St. Thomas, VI 00802
+1.340.998.9447 - voice +1.360.838.9669 - fax
GMT-4
Message 2
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--> Yak-List message posted by:
Subject: Air
I just purchased a YAK 52. It has setup for two years without being flown,
but was run monthly. The only problem I have found involves the air. It will
only pump up to 30 ATM. I I suspected the regulator on the firewall and
replaced the seal, but that didn't solve the problem. I have it screwed all
the way down, but 30 is all I get. I have ordered a new spring in hope that
the old one is weak. I am told that each 1/4 turn equals 5 ATM. Any ideas.
I have a question about the air distribution block on the firewall. It has
four ports. The top one is for the regulator, the port side is for the main
air supply from the engine, the bottom goes to the main air bottle. Is the
other port vented overboard when the max pressure is reached? I have ordered
manuals, but a guessing until they arrive.
Aubrey C. Price
Message 3
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--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Aubrey,
You seem have a pretty good understanding of the components on the firewall.
As you're looking at the air distribution block, on the top as you already
know is the pressure relief valve. Once the preset pressure is reached, the
valve opens and vents the pressure through the small holes in the T just
below the 22 mm locking nut.
On the left as you're looking at the distribution block is a check valve.
This check valve goes to the external air servicing port on the fuselage.
It prevents air from the main system from discharging back out the external
air servicing port. On the right is another check valve which goes to the
"snot bottle", thus preventing air from discharging back toward the
compressor. On the bottom is the only pneumatic system filter on the
airplane.
Have you observed both the front and rear pneumatic system gauges to see if
they agree on the air pressure? Also make sure you have turned the 22 mm
locking nut below the pop off valve completely down to the bottom of its
threads so you can get the maximum number of clockwise turns on the "top
hat" part of the pop off valve. The 5 ATM's per 1/4 turn is an
approximation, but a good rule of thumb to start with.
When the gauge reads 30 ATM's does the pop off valve release air pressure?
If the top hat is turned all the way down and you still can't get above 30
ATM's and both gauges agree, then replacing the spring is the next most
likely problem.
Let me know how things progress. If you wish to take this problem off list,
my email address is adsavar@gte.net. Or you can call me on the telephone.
334-285-2141
Dennis Savarese
----- Original Message -----
From: <owner-yak-list-server@matronics.com>
> --> Yak-List message posted by:
>
> From: Aubrey Price <aprice@vartec.net>
> To: "'yak-list@matronics.com'" <yak-list@matronics.com>
> Subject: Air
> Date: Tue, 5 Aug 2003 08:48:25 -0500
>
> I just purchased a YAK 52. It has setup for two years without being flown,
> but was run monthly. The only problem I have found involves the air. It
will
> only pump up to 30 ATM. I I suspected the regulator on the firewall and
> replaced the seal, but that didn't solve the problem. I have it screwed
all
> the way down, but 30 is all I get. I have ordered a new spring in hope
that
> the old one is weak. I am told that each 1/4 turn equals 5 ATM. Any ideas.
>
> I have a question about the air distribution block on the firewall. It has
> four ports. The top one is for the regulator, the port side is for the
main
> air supply from the engine, the bottom goes to the main air bottle. Is the
> other port vented overboard when the max pressure is reached? I have
ordered
> manuals, but a guessing until they arrive.
>
>
> Aubrey C. Price
>
>
Message 4
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| Subject: | Re: air system charging |
--> Yak-List message posted by: AirshowPilot1@aol.com
Buy a strut pump and use shop air. Several models are available capable of pressures
up to 2000psi. I carry a lightweight stand-alone strapped alongside me
in the cockpit of my 55M on x-country that looks like a bike pump and pushes
up to 650 psi. Takes a lot of work to pump up a dead bottle but it is better
than nothing. The shop air driven strut pumps work fairly quickly and can charge
a dead bottle in a couple of minutes.
W. A. Linscott
Message 5
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--> Yak-List message posted by: "Terry Calloway" <TCalloway@datatechnique.com>
Doug,
I talked to my wife and she said that manufacturing a new throttle handle was a
good possibility. The mold is the expensive part.
The company that builds the molds will be in town Friday if there is any way you
can get me a spare handle to show them in time that would be very good.
Thanks;
tc
Terry L. Calloway MCNE, CDE
Data Technique, Inc.
P.O. Box 1301
3510 Airport Drive
Pittsburg, Kansas 66762
620.235.1000 Office
620.231.0990 Fax
620.231.6727 Home
620.249.9190 Mobile
620.875.9450 Sprint Mobile
479.277.3110 Wal-Mart Desk
tcalloway@datatechnique.com Email
Message 6
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--> Yak-List message posted by: Jim Ivey <jim@jimivey.com>
Aubrey:
I had a similar symptom right after purchasing my bird. I tried many
things but finally found the culprit was the banjo fitting on the air
compressor outlet. The fitting was loose and the crush washer was
unusable. After installing a new crush washer and tightening I was able
to get good air charging up over 30atm.
May not be your problem but it is very easy to check (I wish I had
started with the simple things back during my troubles).
Jim Ivey
Message 7
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<walterfricke@yahoo.com>, <finleycj6@juno.com>,
<tcalloway@datatechnique.com>
--> Yak-List message posted by: Barry Hancock <radialpower@cox.net>
Sorry about the damage....bummer. Great to see you guys, hope you can
stay for the BIG Saturday show next year....
Cheers,
Barry
On Monday, August 4, 2003, at 10:11 PM, Yakjock wrote:
> Great!=A0 I'm glad y'all made it through the boomers.
>
> Blitz, Steve Hollified and I headed out Saturday morning.=A0 Spent a lot
> of time at 10,500 over Minnesota winding through building cumulus - a
> really pretty flight.=A0 Got us through the line of weather that was
> closing to the East.=A0 Made it to Cheyenne that evening.
>
> Sunday dodged boomers through Utah and Nevada.=A0 I couldn't get to
> Oregon so headed for California.=A0 Just West of Salt Lake we went
> through a line of rain between two boomers and found ourselves in a
> hail storm.=A0 Lasted less than 15 seconds, but did considerable damage
> to the planes by way of dented shutter vanes and leading edges as well
> as loss of some paint.=A0 It also nailed the tip of one prop blade so
> that will have to go in.
>
> After spending the night with Blitz, made it back to Oregon this
> morning.=A0 Fifteen hours to the Bay Area, three more to Portland.=A0 All
> told over the ten days I logged 45.4 hours and just over 5,000 miles.=A0
> A great trip with good friends.
>
> Hal Morley
>
>
Barry Hancock
Director of Operations
Red Stars, Inc.
949.300.5510=09
www.allredstar.com
"Communism - Lousy Politics, Great Airplanes"
Message 8
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| Subject: | Re: air system charging |
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Only one word of caution on using a shop-air driven strut pump. It will
induce a significant amount of moisture into the system unless you have a
moisture filter on the output of the pump. As we all know, moisture is our
worst enemy in the pneumatic system.
Dennis Savarese
----- Original Message -----
From: <AirshowPilot1@aol.com>
Subject: Re: Yak-List: air system charging
> --> Yak-List message posted by: AirshowPilot1@aol.com
>
> Buy a strut pump and use shop air. Several models are available capable
of pressures up to 2000psi. I carry a lightweight stand-alone strapped
alongside me in the cockpit of my 55M on x-country that looks like a bike
pump and pushes up to 650 psi. Takes a lot of work to pump up a dead bottle
but it is better than nothing. The shop air driven strut pumps work fairly
quickly and can charge a dead bottle in a couple of minutes.
>
> W. A. Linscott
>
>
Message 9
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--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Excellent point Jim. Also inspect the output check valve on the compressor
where the banjo fitting connects. It carbons up over time and may be
restricting the output from the compressor as well.
Dennis Savarese
----- Original Message -----
From: "Jim Ivey" <jim@jimivey.com>
Subject: Yak-List: Re:
> --> Yak-List message posted by: Jim Ivey <jim@jimivey.com>
>
> Aubrey:
>
> I had a similar symptom right after purchasing my bird. I tried many
> things but finally found the culprit was the banjo fitting on the air
> compressor outlet. The fitting was loose and the crush washer was
> unusable. After installing a new crush washer and tightening I was able
> to get good air charging up over 30atm.
>
> May not be your problem but it is very easy to check (I wish I had
> started with the simple things back during my troubles).
>
> Jim Ivey
>
>
Message 10
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| Subject: | Re: air system charging |
--> Yak-List message posted by: N4829T@aol.com
Guys,
I was at Tyndall, AFB, a few years back and needed some air.... One of the
ramp guys brought out a cylinder of what he thought was air... Turned out to be
a miss marked bottle of Nitrogen... Needless to say hand proping worked
better than the nitrogen.
Jim Plumlee
N31103 CJ/6A
Message 11
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| Subject: | air system charging |
--> Yak-List message posted by: "Coffey, John" <john.coffey@attws.com>
Walt,
What's the manufacturer's name and model # of your lightweight strut
pump? Where did you get it?
Thanks!
John Coffey
Yak-55m Lover
-----Original Message-----
From: AirshowPilot1@aol.com [mailto:AirshowPilot1@aol.com]
Subject: Re: Yak-List: air system charging
--> Yak-List message posted by: AirshowPilot1@aol.com
Buy a strut pump and use shop air. Several models are available capable
of pressures up to 2000psi. I carry a lightweight stand-alone strapped
alongside me in the cockpit of my 55M on x-country that looks like a
bike pump and pushes up to 650 psi. Takes a lot of work to pump up a
dead bottle but it is better than nothing. The shop air driven strut
pumps work fairly quickly and can charge a dead bottle in a couple of
minutes.
W. A. Linscott
Message 12
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| Subject: | Aux. air system charging |
Mail-Followup-To: Wes Warner <wes@lppcs.com>, yak-list@matronics.com
--> Yak-List message posted by: Wes Warner <wes@lppcs.com>
I use a extra small scuba tank that I just put in the baggage area of my
55m. Works great. I get about 3 complete system refills from it.
Wes
--
Time to go to... Group Therapy.
Message 13
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--> Yak-List message posted by:
Subject: Luggage compartment
I have a YAK 52. Does anyone know of a set of plans/drawing to add a luggage
compartment to this aircraft. I am an A&P and don't think it would be that
difficult, but I would prefer to work from plans that have be tested.
Aubrey Price
Message 14
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| Subject: | Re: Aux. air system charging |
--> Yak-List message posted by: Jim Ivey <jim@jimivey.com>
I have a Corneilius type 24v air compressor in the rear of the aircraft
plumbed into the external fill line. It can be run to charge up the
standard air system kind of like an APU. It eats my battery's lunch,
though. It's good in a bind and can be run during flight or taxi if
necessary. I think the previous owner of my bird bought it from Joe
Howse or somebody similar. I think they were used to charge weapon's
systems on B-52's or B-29's.
Jim Ivey
Wes Warner wrote:
>--> Yak-List message posted by: Wes Warner <wes@lppcs.com>
>
>I use a extra small scuba tank that I just put in the baggage area of my
>55m. Works great. I get about 3 complete system refills from it.
>
>Wes
>
>
Message 15
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| Subject: | Hughes H-1B Crash! |
--> Yak-List message posted by: "Petri David S Contractor USNORTHCOM J3" <David.Petri@northcom.mil>
I just read on the NTSB site that the replica Hughes H-1B crashed in Yellowstone
National Park and the pilot was killed:
http://www1.faa.gov/avr/aai/M_0805_N.txt
I checked the registration number, and it appears to be the one that was just built
by Jim Wright in Cottage Grove, Oregon, and that was supposed to appear at
Oshkosh this year:
http://www.eaa.org/communications/eaanews/pr/030509_h1b_racer.html
Message 16
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| Subject: | YPA Transitional Brief |
--> Yak-List message posted by: "Drew Blahnick" <aapilot@adelphia.net>
Folks,
As promised, I've provided interested parties with detailed information on the
Transitional Brief given at MTW at:
http://www.allredstar.com/The_Cockpit.asp
I hope this answers questions and please, e-mail me directly off list with your
feedback, positive and negative and I will address your issues if any.
Thanks,
Drew
Drew Blahnick
YPA/Red Star
310.386.9181
"Communism: Lousy Politics - Excellent Airplanes!"
Message 17
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| Subject: | Re: Hughes H-1B Crash! |
--> Yak-List message posted by: William Halverson <william@netpros.net>
What a waste ..
Petri David S Contractor USNORTHCOM J3 wrote:
>--> Yak-List message posted by: "Petri David S Contractor USNORTHCOM J3" <David.Petri@northcom.mil>
>
>I just read on the NTSB site that the replica Hughes H-1B crashed in Yellowstone
National Park and the pilot was killed:
>http://www1.faa.gov/avr/aai/M_0805_N.txt
>
>I checked the registration number, and it appears to be the one that was just
built by Jim Wright in Cottage Grove, Oregon, and that was supposed to appear
at Oshkosh this year:
>http://www.eaa.org/communications/eaanews/pr/030509_h1b_racer.html
>
Message 18
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| Subject: | Hughes H-1B Crash! and YPA at OSH |
--> Yak-List message posted by: "Mark Schrick" <schrick@pacbell.net>
I just took great pictures of it Sunday morning as the sun came
up at 7am. Jim Wright is in the picture wiping the morning dew
off the wings.
Watch a shame and very sorry to hear. The prettiest metal job
I have ever seen.
Great to see everyone at OSH this year and the YPA formation
looked great (have pictures) with the only down side being this
crash.
Mark "SHREK" Schrick
Mark Schrick
966 Wallace Drive
San Jose, CA 95120
(408) 323-5150(H) or (408) 391-6664 (Car)
>--- Original Message ---
>From: William Halverson <william@netpros.net>
>To: yak-list@matronics.com
>Date: 8/5/03 2:06:07 PM
>
--> Yak-List message posted by: William Halverson <william@netpros.net>
>
>What a waste ..
>
>Petri David S Contractor USNORTHCOM J3 wrote:
>
>>--> Yak-List message posted by: "Petri David S Contractor USNORTHCOM
J3" <david.petri@northcom.mil>
>>
>>I just read on the NTSB site that the replica Hughes H-1B crashed
in Yellowstone National Park and the pilot was killed:
>>http://www1.faa.gov/avr/aai/M_0805_N.txt
>>
>>I checked the registration number, and it appears to be the
one that was just built by Jim Wright in Cottage Grove, Oregon,
and that was supposed to appear at Oshkosh this year:
>>http://www.eaa.org/communications/eaanews/pr/030509_h1b_racer.html
>>
>
>
Message 19
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| Subject: | Re: air system charging |
--> Yak-List message posted by: AirshowPilot1@aol.com
Aircraft Spruce carries the portable strut pump - part no. 12-16714. www.aircraftspruce.com. 1-877-477-7823. It is pricey at $234.00. You can expect to pump the thing for a while because it moves a small volume but it will pressurize up to 650psi by hand. Aircraft tool supply www.aircraft-tool.com carries the compressor driven pump. These use an internal piston that will push the inlet pressure up 15 times so in theory you only need about 50 psi from your compressor to get 750psi out. It works best at 100-120 psi inlet. I have both and they do work - the "boosted" variety works best.
Message 20
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| Subject: | Re: air system charging |
--> Yak-List message posted by: AirshowPilot1@aol.com
Yes - the strut pump should be used with moisture conditioned shop air (moisture
trap)if possible but is a good out on the road even without the moisture trap
if you need that extra boost to get home.
Message 21
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--> Yak-List message posted by: "Dee Grimm" <deegrimm@cox.net>
Hi Hal,
It sounds like a hair raising trip. Glad to hear you guys all made it with
no one hurt.
Regards, Dee
----- Original Message -----
From: "Yakjock" <Yakjock@msn.com>
<walterfricke@yahoo.com>; <finleycj6@juno.com>;
<tcalloway@datatechnique.com>; <radialpower@cox.net>
Subject: Yak-List: Re: HOME!
> --> Yak-List message posted by: "Yakjock" <Yakjock@msn.com>
>
> Great! I'm glad y'all made it through the boomers.
>
> Blitz, Steve Hollified and I headed out Saturday morning. Spent a lot of
time at 10,500 over Minnesota winding through building cumulus - a really
pretty flight. Got us through the line of weather that was closing to the
East. Made it to Cheyenne that evening.
>
> Sunday dodged boomers through Utah and Nevada. I couldn't get to Oregon
so headed for California. Just West of Salt Lake we went through a line of
rain between two boomers and found ourselves in a hail storm. Lasted less
than 15 seconds, but did considerable damage to the planes by way of dented
shutter vanes and leading edges as well as loss of some paint. It also
nailed the tip of one prop blade so that will have to go in.
>
> After spending the night with Blitz, made it back to Oregon this morning.
Fifteen hours to the Bay Area, three more to Portland. All told over the
ten days I logged 45.4 hours and just over 5,000 miles. A great trip with
good friends.
>
> Hal Morley
>
>
Message 22
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--> Yak-List message posted by: "dabear" <dabear@damned.org>
Thinking of going to a digital tach and wondering if anyone out
there has used the Horizon Instruments P-1000? Any other non
Chinese/Russian Tachs that anyone is using in their CJ or Yak?
Thoughts?
Regards,
Al DeVere
Message 23
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| Subject: | Re: Tach Question |
--> Yak-List message posted by: "A. Dennis Savarese" <adsavar@gte.net>
Although I personally don't have one, my hanger neighbor does have one in
his 52. I found it to be too sensitive for my liking and I was constantly
chasing the numbers. As you know, the 52 uses percent RPM. I'm used to
that and trying to chase 10 or 20 rpm was more of a pain to me. FWIW.
Dennis Savarese
----- Original Message -----
From: "dabear" <dabear@damned.org>
Subject: Yak-List: Tach Question
> --> Yak-List message posted by: "dabear" <dabear@damned.org>
>
> Thinking of going to a digital tach and wondering if anyone out
> there has used the Horizon Instruments P-1000? Any other non
> Chinese/Russian Tachs that anyone is using in their CJ or Yak?
> Thoughts?
>
>
> Regards,
>
> Al DeVere
>
>
Message 24
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| Subject: | Re: Tach Question |
--> Yak-List message posted by: Jim Ivey <jim@jimivey.com>
Al:
I have an Electronics International digital tach installed in my CJ with Yak
52 FWF (M14P). I concurr with Dennis's analysis about electronic tachs. They
can be a little squirrely on the read-out. His neighbor seems to have the
Horizon version and it sounds the same as the EI like mine. The EI does have
an "alleged" analog read-out with it's circumferential green lights that light
up in a circle based on RPM (kind of like a needle tip).
I don't know why electronic tachs are so squirrely. Maybe it's the
interference or quality of pick-up. The only exception to this rule I have
seen is with the JPI EDM-800 I installed in my Comanche. It's RPM readings
are rock solid and smooth. Then again it's a Lycoming installation so there
are too many moving targets to say why the JPI seems better than my EI in the
CJ.
The EI tach was in my aircraft when I bought it and I figured it was installed
because an American Jasco alternator was put on the engine and therefore there
was no tach signal output to run the original tach.
Jim Ivey
Quoting dabear <dabear@damned.org>:
> --> Yak-List message posted by: "dabear" <dabear@damned.org>
>
> Thinking of going to a digital tach and wondering if anyone out
> there has used the Horizon Instruments P-1000? Any other non
> Chinese/Russian Tachs that anyone is using in their CJ or Yak?
> Thoughts?
>
>
> Regards,
>
> Al DeVere
>
>
>
>
>
>
Message 25
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| Subject: | Re: Tach Question |
--> Yak-List message posted by: "Dee Grimm" <deegrimm@cox.net>
Hi Al,
I Havre two digital tachs in my CJ. They are set to read out in percent
and they work very well. I have not contacted George Evans about the smoke
tank yet but hope to get that done tomorrow.
Regards, Dee
----- Original Message -----
From: "dabear" <dabear@damned.org>
Subject: Yak-List: Tach Question
> --> Yak-List message posted by: "dabear" <dabear@damned.org>
>
> Thinking of going to a digital tach and wondering if anyone out
> there has used the Horizon Instruments P-1000? Any other non
> Chinese/Russian Tachs that anyone is using in their CJ or Yak?
> Thoughts?
>
>
> Regards,
>
> Al DeVere
>
>
Message 26
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| Subject: | Re: Tach Question |
--> Yak-List message posted by: Brian Lloyd <brian@lloyd.com>
Jim Ivey wrote:
> The EI tach was in my aircraft when I bought it and I figured it was installed
> because an American Jasco alternator was put on the engine and therefore there
> was no tach signal output to run the original tach.
The tach generator is not the same as the generator for the eletrical system.
You can switch to an alternator and still use the stock tach.
--
Brian Lloyd 6501 Red Hook Plaza, Suite 201
brian@lloyd.com St. Thomas, VI 00802
+1.340.998.9447 - voice +1.360.838.9669 - fax
GMT-4
Message 27
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--> Yak-List message posted by: "Frank Stelwagon" <pfstelwagon@earthlink.net>
I have a Horizon digital tach in my CJ (front cockpit) rear cockpit has stock tach.
If you want to keep the stock tach location then the EI would be the way
to go as it is 2 1/4 inch. The digital tach is a bit strange to use initially
but it grows on you.
Frank
CJ-6A N23021
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