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  #11  
Old 04-23-2018, 02:28 AM
MeAndMyToys MeAndMyToys is offline
 
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Quote:
Originally Posted by greghughespdx View Post
For better cabin heat, might want to call or email Clint at Vetterman and discuss the relative benefits of a trombone exhaust and any power differences.
I planned on the Trombone system with mufflers for mine for reason of cabin heat. Clint talked me into the 4 pipe, he said it produced plenty of heat and had a lot more clearance for everything.
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  #12  
Old 04-23-2018, 04:41 AM
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ronschreck ronschreck is offline
 
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I recently installed Vetterman's 4-pipe exhaust and asked Rick Robbins to modify his heat muff for one and a half inch hoses instead of 2-inch hoses and also asked him to shorten the muff by an inch and a half. All of this to provide more room behind the engine for my inverted oil system and oil accumulator. I still get plenty of heat from the muff as it covers two of the 4 exhaust pipes. Clint and Rick are great to work with. I'm VERY happy with the new exhaust and heat muff.

I had Vetterman's cross-over exhaust on the plane and it served well for 2200 hours. I went to the 4-pipe exhaust following a recent engine overhaul. The 4-pipe does give more room for cables and hoses under the sump and there is no problem with room for 4 pipes at the cowl exit. And the sound! Oh, the sound!
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  #13  
Old 04-23-2018, 05:42 AM
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MikeyDale MikeyDale is offline
 
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I have a 4 pipe Vetterman exhaust in my 7 and I love it! Sounds great and heater is awesome in the cockpit! I called Vetterman and he told me just what I needed. Great service!
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  #14  
Old 04-23-2018, 09:31 AM
SHIPCHIEF SHIPCHIEF is offline
 
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Location: Seattle
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I have the Vetterman Crossover for Superior cold air sump on my RV-8.
I think 4 straight pipes are louder, and tune to a narrower RPM powerband.
If you run a constant speed propeller, 4 straight pipes may be the ticket.
For me, with a fixed pitch, I would like a bit more mid-range power I think the cross-over system affords.
I like the slightly mellow sound, some like the straight pipe bark!
(It could all be in my head?)
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