pitts_pilot(at)bellsouth.
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 Posted: Mon Mar 29, 2010 7:05 am Post subject: [Bulk] Re: baffle sealing and hot cylinder cures |
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Another well-known issue is the flashing down between the fins around
the spark plug. Take the flashlight (see Vince below) or a droplight
and put below the cylinder and look down between the fins. A small
needle file will clean up the flashing. I've also heard of people using
a drywall cutting bit in there.
Linn
Kelly McMullen wrote:
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Be very careful what you seal up. #2 and #3 cylinders MUST have air on
the intake port side, which is the side against the baffles. You need
a minimum 1/8" gap between cylinder head and baffle there, probably
3/16 would be better. Lycoming does not cast any fins on the cylinder
head on the intake port side. If you seal that, your cylinder will run
40-50 degrees hotter. It is a well known issue with Lycoming engines.
Kelly
A&P/IA
On 3/29/2010 7:08 AM, Frazier, Vincent A wrote:
> SNIP Regarding the requirement for sealing compound (silicon?) around
> the baffle-to-engine areas, what is the recommendation here? Is
> sealant absolutely necessary?
> FWIW, a very often overlooked, LARGE air leak occurs at the bottom
> aft edge of the rear cylinders where they meet the case. There is
> often a huge, very hard to see hole there. Stick a flashlight back
> under and behind the cylinders and shine it up and forward. I'll bet
> you find a huge hole there. If nothing else, plug those! IMHO, this
> is a possible reason that many rear cylinders are unnecessarily hot.
>
> For other tips on curing hot cylinders please see
> http://www.vincesrocket.com/Engine%20and%20Prop.htm
> The top of the page is devoted to two common heat issues on Lycomings.
>
> Vince
> www.flyboyaccessories.com
> www.vincesrocket.com
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