Today's Message Index:
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1. 12:40 AM - Re: Rocket-List Digest: 13 Msgs - 06/06/08 (capmrp)
2. 02:26 AM - CHT's and Fuel Flows ()
3. 05:56 AM - Re: Subscriptions (N395V)
4. 06:11 AM - Re: CHT's and fuel flows (N395V)
5. 08:07 AM - Re: CHT's and fuel flows (Wiley)
Message 1
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| Subject: | Re: Rocket-List Digest: 13 Msgs - 06/06/08 |
A friend had the same problem and closer inspection revealed that the full
rich position of Mixture Control was not producing full rich at the engine.
Upon re-rigging, CHT's came down to normal.
mp
Message 2
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| Subject: | CHT's and Fuel Flows |
On one of my early cross country flights, I had to pull back the rpm's a bit when
I noticed one of the CHT's was getting close to my personal upper limit of
400'.
Back home after pulling the cowl and plenum, I noticed that some of the paint on
the cylinder heads had flaked partially blocking air flow, particularly on the
hot cylinder head.
I took great care to completely clean out all the cooling fins of any paint flakes
or casting flash and I was amazed to see a dramatic drop in the formerly hot
CHT!
I am also amazed at how operating lean of peak in economy cruise ( I NEVER run
LOP at high power settings) drops CHT's! Bart did a nice job right from his shop
on my fuel flows to each cylinder...I sent my data to GAMI and they responded
that my numbers were so close with the stock injectors that there was nothing
they could do for me!
A good rule of thumb with the IO-540's is at full power, take your fuel flow in
gph and multiply by 10 (add a zero at the end of the fuel flow) and that will
give you a pretty good idea of the horsepower you are getting. So depending
on compression ratio, it is normal to see takeoff fuel flows at sea level in the
26 to 29 gph range.
Paul Siegel Evo N4XU
Message 3
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| Subject: | Re: Subscriptions |
Nico,
See my post on the Commander List
do not archive
--------
Milt
2003 F1 Rocket
2006 Radial Rocket
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=186653#186653
Message 4
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| Subject: | Re: CHT's and fuel flows |
First thing is make sure your guage is calibrated and reading correctly.
You can drop the sensors in boiling water and they should read close to 212 deg
F or drop them in a frydaddy filled with cooking oil if you can find a good thermometer
that will read in that range. You should be able to adjust the fry
daddy from ambient temp to CHT operating temps.
I fought High CHTs for the first 6 months in my F1. Checked timing and CHT guage
that wasn't the problem. Finally put louvers in the cowl bottom and that solved
the problem. Now I rarely see CHTs above 380. My TO fuel flow (260HP) is
same as Gummos. at cruise WOT and 2100 RPM FF is 13.3 GPH (above 10,000')
If I go LOP FF drops to 10.6 GPH at same settings and altitude and I lose about
5 KTS TAS. CHTs in the 340-360 range.
Louver install link here
http://www.bearcataviation.com/album_frame.asp?menuID=6
--------
Milt
2003 F1 Rocket
2006 Radial Rocket
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=186654#186654
Message 5
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| Subject: | Re: CHT's and fuel flows |
Great info from everyone, thanks. That avweb article is really educational.
I played around with the rubber bafflle at the lower entrance to the inlet and
found my chts went straigth to 424 and didn't want to come down. I put them back
in original position and it went to 410 but came down with lower power settings
quickly to 385 (21sq)
I'm thinking this might hold the answer. I'm thinking of reworking the inlets to
get the flow smoother and not letting any air escape to the bottom of cowl.
Anyone going to the Golden West Airshow Sunday? Hoping there is a rocket or two
there to get some ideas.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=186666#186666
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