Today's Message Index:
----------------------
1. 02:21 AM - Re: leaning, plugs, rockers, dry tappet clearance, CHT (Mark Thomas Mueller)
2. 10:22 AM - Re: Re: leaning, plugs, rockers, dry tappet clearance, CHT (TeamGrumman@AOL.COM)
3. 04:19 PM - Re: leaning, plugs, rockers, dry tappet clearance, CHT (FLYaDIVE@AOL.COM)
4. 05:52 PM - Re: leaning, plugs, rockers, dry tappet clearance, CHT (flyv35b)
Message 1
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| Subject: | RE: leaning, plugs, rockers, dry tappet clearance, CHT |
--> TeamGrumman-List message posted by: "Mark Thomas Mueller" <mark.t.mueller@comcast.net>
Gary,
Are you saying the Lyc new style rockers are available? I haven't heard a
thing since OSH...
Also, I am quite torn. That IO-360 is really looking like a great idea when
my motor is due for OH. There are claims that the IO-equipped Tigers are
truing out at 150 kts. BUT, is the IO as durable as the old O? I also had
one engine builder ask why, since the IO doesn't typically put out a 'real'
200 hp, but you can build the O to put out 180+...
Ahhh, what to do...
TIA,
Mark
Tiger N1533R
Time: 11:30:01 AM PST US
From: TeamGrumman@AOL.COM
Subject: TeamGrumman-List: leaning, plugs, rockers, dry tappet clearance,
CHT
Now, did that title get your attention?
Ken at LyCon had told me that the new style Lycoming rockers have a little
higher rocker ratio. He couldn't give me any numbers, that's just what he
said. He also said it was worth a few horsepower at 2700 rpm, so, what the
hell,
I'd get some. First, they do have a different part number and they are all
the same style; that is, they all squirt at the valve stem.
Changing the rockers isn't so simple. The entire valve train has to come
apart and the lifters bled down and cleaned.
While pulling the plugs I noticed the top plugs were all the tan color
commonly accepted as indicating an ideal fuel:air mixture ratio. I
expected to
see
some lead in the bottom plugs after 90 hours. There was none. Not that
there was a very small amount, there was NONE. Plug gap had gone from
nominally 0.018 to 0.022. I regapped the plugs and reinstalled.
Back to the rockers. Not sure where the rocker ratio was changed in the
geometry of the rocker, but all push rods had to be refitted to get the
proper
dry tappet clearance. I also needed to get two LONGER (#36) push rods. I
expected, given some wear-in on new valves, that some of the play would be
taken
up and the box of shorter push rods that I have (I have about a dozen #35s)
would suffice. Not the case. I did manage to get all the the exhaust to
around 0.060 +/- and the intakes to around 0.040 +/- on their clearances.
It's
unlikely that I'll notice any difference in the engine.
Message 2
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| Subject: | Re: RE: leaning, plugs, rockers, dry tappet clearance, |
CHT
--> TeamGrumman-List message posted by: TeamGrumman@aol.com
In a message dated 3/15/05 2:21:47 AM, mark.t.mueller@comcast.net writes:
> Also, I am quite torn. That IO-360 is really looking like a great idea when
> my motor is due for OH. There are claims that the IO-equipped Tigers are
> truing out at 150 kts. BUT, is the IO as durable as the old O? I also had
> one engine builder ask why, since the IO doesn't typically put out a 'real'
> 200 hp, but you can build the O to put out 180+...
>
If you wanted, you could make an IO360 parallel valve engine put out 240 hp.
The reason I want to do a parallel valve IO360 is because it is a direct
bolt in and it's lighter than the angle valve engine. I'll do it one day.
Cowling is first.
Gary
Message 3
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| Subject: | Re: leaning, plugs, rockers, dry tappet clearance, CHT |
--> TeamGrumman-List message posted by: FLYaDIVE@aol.com
In a message dated 3/14/05 2:30:56 PM Eastern Standard Time,
TeamGrumman@AOL.COM writes:
> Ken at LyCon had told me that the new style Lycoming rockers have a little
> higher rocker ratio. He couldn't give me any numbers, that's just what
he
> said. He also said it was worth a few horsepower at 2700 rpm, so, what
the
> hell,
> I'd get some. First, they do have a different part number and they are
all
>
> the same style; that is, they all squirt at the valve stem.
==============================
Gary:
MUCH more information is required from LyCon.
1 - What is their definition of Rocker Ratio?
Would it be INPUT MOVEMENT to OUTPUT MOVEMENT? If so HOW can that be? Since
The three points controlling that ratio are FIXED ... Location of push rod,
Location of fulcrum, and Location of Valve Stem.
2 - Do they mean ANGLE of Rocker Arm?
Well, that would not matter either since the ANGLE would increase or decrease
the amount of valve opening and time.
And since, as you mentioned you used the same dry tapped clearance and valve
clearance I do not understand where the extra HP would be coming from?
3 - The idea of using rockers that squirt oil ON THE VALVES is a great idea.
And that is an easy operation to achieve. Lycoming use to use two different
rockers Intake which squirted AWAY from the valve and Exhaust which squirts
towards the valve.
After many problems with burnt valves because of mixing up the rockers
(believe me, I know, I was one costumer with this problem. I still have the burnt
ROCKER) Lycoming went to ALL Exhaust Rockers. So the idea of valve squirting
rockers is not new. I have them on ALL my rockers.
Even the one I am off.
Barry
"Chop'd Liver"
Message 4
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| Subject: | Re: leaning, plugs, rockers, dry tappet clearance, CHT |
--> TeamGrumman-List message posted by: "flyv35b" <flyv35b@ashcreekwireless.com>
Lycoming has used the old exhaust rocker arms on the intake for some time
now. I think it was Bill Marvel that prompted them to change as he had a
newly overhauled engine that they mixed up the arms on and they ended up
giving him a brand new engine out of the deal.
There isn't enough oil coming down the pushrod to squirt much oil anyway. I
think it just dribbles out probably.
Cliff
----- Original Message -----
From: <FLYaDIVE@AOL.COM>
Subject: Re: TeamGrumman-List: leaning, plugs, rockers, dry tappet
clearance, CHT
> --> TeamGrumman-List message posted by: FLYaDIVE@aol.com
>
> In a message dated 3/14/05 2:30:56 PM Eastern Standard Time,
> TeamGrumman@AOL.COM writes:
>
>> Ken at LyCon had told me that the new style Lycoming rockers have a
>> little
>> higher rocker ratio. He couldn't give me any numbers, that's just what
> he
>> said. He also said it was worth a few horsepower at 2700 rpm, so, what
> the
>> hell,
>> I'd get some. First, they do have a different part number and they are
> all
>>
>> the same style; that is, they all squirt at the valve stem.
> ==============================
> Gary:
>
> MUCH more information is required from LyCon.
> 1 - What is their definition of Rocker Ratio?
> Would it be INPUT MOVEMENT to OUTPUT MOVEMENT? If so HOW can that be?
> Since
> The three points controlling that ratio are FIXED ... Location of push
> rod,
> Location of fulcrum, and Location of Valve Stem.
>
> 2 - Do they mean ANGLE of Rocker Arm?
> Well, that would not matter either since the ANGLE would increase or
> decrease
> the amount of valve opening and time.
> And since, as you mentioned you used the same dry tapped clearance and
> valve
> clearance I do not understand where the extra HP would be coming from?
>
> 3 - The idea of using rockers that squirt oil ON THE VALVES is a great
> idea.
> And that is an easy operation to achieve. Lycoming use to use two
> different
> rockers Intake which squirted AWAY from the valve and Exhaust which
> squirts
> towards the valve.
> After many problems with burnt valves because of mixing up the rockers
> (believe me, I know, I was one costumer with this problem. I still have
> the burnt
> ROCKER) Lycoming went to ALL Exhaust Rockers. So the idea of valve
> squirting
> rockers is not new. I have them on ALL my rockers.
>
> Even the one I am off.
>
> Barry
> "Chop'd Liver"
>
>
>
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