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dwight(at)openweave.org
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 Posted: Wed May 02, 2007 6:31 am Post subject: Exhaust Installation |
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I have a friend who has to replace his exhaust system on an RV-4, and
he has asked for my assistance. Thing is, this will be a learning
experience for me (i.e. I've not installed _my_ exhaust yet) rather than
one of those been-there-done-that situations. So I have questions.
We'll be installing a Vetterman crossover exhaust on his engine. The
existing exhaust is not a Vetterman, so there are changes afoot. For
one the current EGT probes will need to be changed and are not being
done at this time. Should we leave drilling for the probes until we
have them in hand, or can we drill the holes now and cover them (say
with a piece of SS and a band clamp)? If we wait to drill later (which
makes more sense, to me) can we drill the holes in place? Or would we
need to remove the exhaust to drill so we can (for instance) debur the
backside of the holes?
The exhaust hangers will be totally different, and I have heard that
Vetterman is providing a new/improved hanger arrangement. Does anyone
have experience with the new hanger setup they can share? Does it
attach with some of the sump bolts? Or some other mechanism? In short,
is there anything we need to be forewarned about regarding the hangers?
His current setup has the breather tube routed into one of the exhaust
pipes. This will need to change as well. Does anyone have good examples
of how (and where) to terminate the breather line? Any "gotchas" or
"best practices" we should be aware of? How about torque values on the
attach bolts? On the sump or case bolts, if we have to remove them to
attach the hanger? Anything I've forgotten?
Thanks, in advance, for any up-front educating you can give me so we
get this right the first time.
-- Dwight
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n616tb(at)btsapps.com
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| Posted: Wed May 02, 2007 6:50 am Post subject: Exhaust Installation |
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Dwight,
Obviously there are some differences between this RV4 and my -6 however the
location of the EGT probes is very near where the exhaust exits the heads.
I had no problem drilling these after the exhaust was in place and did not
remove them after. I also am not familiar with any changes Vetterman made
to the exhaust hangars, but mine attached to the lower portion of the engine
mount between the firewall and the engine. There was a piece of tubing with
fittings that sort of made a sling across the back where the exhaust clamps
could attach. I don't think you will have any problem figuring this out.
No attachments to the sump bolts were made on mine. Again the RV-4 or any
changes may be different. Maybe someone with a current RV-4 setup can jump
in.
Tim
[quote] --
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tc1234c(at)roadrunner.com
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| Posted: Wed May 02, 2007 9:37 am Post subject: Exhaust Installation |
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Dwight,
I drilled holes in place. Before you drill make sure the screw on the clamp
does not interfere with the spark plug. I have posted some pictures of my
engine and instruments installation on Picasa. It should give you some idea
about the hanger and the breather tube routing. Following are the links.
http://picasaweb.google.com/tc1234c/Engine
http://picasaweb.google.com/tc1234c/GRTInstallation
Ted
------------------------------------------
T.C. Chang
http://tc1234c.googlepages.com/
RV-9A, Lycoming (ECI) O320-D2A, 160 hp, Carb, Dual Mag, Sensenich FP
GRT dual DU H1, TT DigiFlight II VSGV, 145.6 hr Hobbs
--
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Oldsfolks(at)aol.com
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| Posted: Sat May 05, 2007 6:02 pm Post subject: Exhaust Installation |
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You don't need the crankcase vent line to go INTO the exhaust pipe , just down to and almost against it. Any drops of oil will hit the pipe and become ash quickly. Has worked for me for years.
Bob Olds RV-4
Charleston,Arkansas
See what's free at AOL.com.
[quote][b]
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