The Murphy Builders Site

I finally figured out what headers I need and I am having them shipped
direct from Summit Racing to Performance Coatings in Washington to have them
coated. I know I'm not imaging it. I could swear I read somewhere that
freshly coated headers should not be used during the engine break in period
but now I can't find the reference anywhere. Has anyone heard of this
before? It sure doesn't seem like I would be likely to see excessive EGT
during break in.

I ran into another unexpected issue as well. I measured the distance from
the prop hub on my PSRU to the other side of the engine and it is almost
four feet. Add at least 6 inches for some wiggle room between the firewall
and I would need a cowl about 4 and a half feet long. I went out to the
airport and measured the cowl on a 206. It is longer at the top than at the
bottom, but at the longest point it is only about 3 and a half feet long.
It should have occurred to me before but certainly a six cylinder lycoming
without a PSRU would be shorter than a V8 with a PSRU. Not only will I have
some extra weight up front, but it's going to be farther away from the
firewall as well. Good thing I'm using a very light prop. I wouldn't think
the Murphy cowl would even be adaptable either.

Mike Kimball
SR #044




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Hey Mike, you might try sending an e-mail off to the guy who sent me the
Helicor V400 information to ask about the engine length. One of their
claims is that it fits into an unmodified lycoming cowl. I know they are
using their own PSRU and that may be where the difference lies, but he may
be willing to share some numbers with you.

Mike

"Mike Kimball" <mkimball@gci.net> wrote in message
news:000c01c40680$16834a20$0900a8c0@mikespc...

I finally figured out what headers I need and I am having them shipped
direct from Summit Racing to Performance Coatings in Washington to have

them

coated. I know I'm not imaging it. I could swear I read somewhere that
freshly coated headers should not be used during the engine break in

period

but now I can't find the reference anywhere. Has anyone heard of this
before? It sure doesn't seem like I would be likely to see excessive EGT
during break in.

I ran into another unexpected issue as well. I measured the distance from
the prop hub on my PSRU to the other side of the engine and it is almost
four feet. Add at least 6 inches for some wiggle room between the

firewall

and I would need a cowl about 4 and a half feet long. I went out to the
airport and measured the cowl on a 206. It is longer at the top than at

the

bottom, but at the longest point it is only about 3 and a half feet long.
It should have occurred to me before but certainly a six cylinder lycoming
without a PSRU would be shorter than a V8 with a PSRU. Not only will I

have

some extra weight up front, but it's going to be farther away from the
firewall as well. Good thing I'm using a very light prop. I wouldn't

think

the Murphy cowl would even be adaptable either.

Mike Kimball
SR #044

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Hey Mike,

Take this a suggested reason from someone who has absolutely NO IDEA,
but maybe there are two reasons to not coat new stuff. First might be
to wait until there have been a number of heating/cooling cycles that
will "normalize" the structure in-situ by working out the metal
stresses from forming and machining and attachment to the engine
block; and second to form a metal surface conducive to adherence of
the applied material. It may be that their process is set-up to deal
with the "used" items, and a new part would have to use either a
different formula or process. Why not contact Performance Coatings
and ask?

Take care.

Brian Lawson,
Bothwell, Ontario.
XXXXXXXXXXXXXXXXXX
On Wed, 10 Mar 2004 00:14:27 -0900, you wrote:

I finally figured out what headers I need and I am having them shipped
direct from Summit Racing to Performance Coatings in Washington to have

them

coated. I know I'm not imaging it. I could swear I read somewhere that
freshly coated headers should not be used during the engine break in

period

but now I can't find the reference anywhere. Has anyone heard of this
before? It sure doesn't seem like I would be likely to see excessive

EGT

during break in.

I ran into another unexpected issue as well. I measured the distance

from

the prop hub on my PSRU to the other side of the engine and it is almost
four feet. Add at least 6 inches for some wiggle room between the

firewall

and I would need a cowl about 4 and a half feet long. I went out to the
airport and measured the cowl on a 206. It is longer at the top than at

the

bottom, but at the longest point it is only about 3 and a half feet

long.

It should have occurred to me before but certainly a six cylinder

lycoming

without a PSRU would be shorter than a V8 with a PSRU. Not only will I

have

some extra weight up front, but it's going to be farther away from the
firewall as well. Good thing I'm using a very light prop. I wouldn't

think

the Murphy cowl would even be adaptable either.

Mike Kimball
SR #044




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Mike
Don't recall what you are using for a psru but the automotive engine
c of g is almost always farther aft than for a Lyc. engine so you may
not be as far out as it looks. Also there tends to be less aerodynamic
drag if the prop is forward of the main cross section (the front face)
of the nose bowl as can happen with a long psru.
Ken

Mike Kimball wrote:

snip
It should have occurred to me before but certainly a six cylinder lycoming
without a PSRU would be shorter than a V8 with a PSRU. Not only will I have
some extra weight up front, but it's going to be farther away from the
firewall as well. Good thing I'm using a very light prop. I wouldn't think
the Murphy cowl would even be adaptable either.

Mike Kimball
SR #044

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I was able to talk to Performance Coatings this morning. Although they
think initially running the engine with some old headers until it is well
adjusted is a great idea, they don't think it is absolutely necessary. The
concern is not so much the break in period of the engine but rather the
break in period of the new headers. Also, they would be concerned with
overly hot EGT due to an improperly tuned engine (too lean) while you're
getting your engine set up during the initial runs. They suggest a cautious
break in period (for the headers). Initial short duration runs (10 minutes)
then slowly increase the time of operation. That doesn't sound like the
best way to break in an engine so I think some old headers initially would
be a good idea. Break the engine in first following known engine break-in
guidelines (long duration high power settings), then replace the old headers
with the new coated headers and break them in as Performance Coatings
suggests.

Mike Kimball
SR #044


-----Original Message-----
From: Mike Kimball [mailto:mkimball@gci.net]
Sent: Wednesday, March 10, 2004 12:14 AM
To: Rebel List
Subject: Exhaust coating revisited and another V8 issue


I finally figured out what headers I need and I am having them shipped
direct from Summit Racing to Performance Coatings in Washington to have them
coated. I know I'm not imaging it. I could swear I read somewhere that
freshly coated headers should not be used during the engine break in period
but now I can't find the reference anywhere. Has anyone heard of this
before? It sure doesn't seem like I would be likely to see excessive EGT
during break in.

I ran into another unexpected issue as well. I measured the distance from
the prop hub on my PSRU to the other side of the engine and it is almost
four feet. Add at least 6 inches for some wiggle room between the firewall
and I would need a cowl about 4 and a half feet long. I went out to the
airport and measured the cowl on a 206. It is longer at the top than at the
bottom, but at the longest point it is only about 3 and a half feet long.
It should have occurred to me before but certainly a six cylinder lycoming
without a PSRU would be shorter than a V8 with a PSRU. Not only will I have
some extra weight up front, but it's going to be farther away from the
firewall as well. Good thing I'm using a very light prop. I wouldn't think
the Murphy cowl would even be adaptable either.

Mike Kimball
SR #044




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