Home > VansAirForceForums

-Advertise in here!
- Today's Posts | Insert Pics

Keep VAF Going
Donate methods

Point your
camera app here
to donate fast.

Old 07-22-2014, 06:32 PM
Warbirdsolutions Warbirdsolutions is offline
Join Date: Oct 2012
Location: Prospect, KY
Posts: 68
Default 4 pipe & 4-1 exhaust

I'm looking for feedback on both the 4 pipe exhaust and the 4 into 1 exhaust. I'm interested in fit, sound, and performance. Anything you might like to offer would be greatly appreciated!
Thanks in advance!
Reply With Quote
Old 07-22-2014, 07:37 PM
BillL BillL is offline
Join Date: Sep 2007
Location: Central IL
Posts: 5,746

I have the AWI 4into1 on an IO360. It has not run. I think the individual 4 pipes are probably the best performance. I got the AWI to reduce the effect on the exit flow area from the cowl. The AWI has studs welded to the pipe for the heat muff, so I a hoping that will suffice in cold ambients.

I haven't heard a 4into1 since the air-cooled VW days. It is pretty easy to tell the 4 pipe and 2x2 when flying over.

What plane/engine are you building or have?

Lord Kelvin:
I often say that when you can measure what you are speaking about,
and express it in numbers, you know something about it; but when you
cannot measure it, when you cannot express it in numbers, your knowledge
is of a meager and unsatisfactory kind.
Reply With Quote
Old 07-22-2014, 08:09 PM
Flyguytki's Avatar
Flyguytki Flyguytki is offline
Join Date: Jun 2007
Location: Fairbanks AK
Posts: 758

I had a AWI 4 into 1 on my Superior IO-360 with horizontal induction. The fit was excellent and needed no modification to the exhaust airbox or cowling. Now the sound, I never personally heard it however I was told it has a much deeper throaty sound to it compared to Vettermans. And not that I need to say it bud man does it look good.

As far as the heater goes you have nothing to worry about, the welded screws do what they are designed for and work great, I was never able to pull the heater more than half open before roasting.

I no longer have the airplane but I can still answer any questions you might have
RV-7 N87DX Built, Flown, and Sold!
Reply With Quote
Old 07-22-2014, 09:36 PM
flyingriki's Avatar
flyingriki flyingriki is offline
Join Date: Sep 2008
Location: California
Posts: 697

Some of the racers at Reno swear by 4 into 1. Larry Vetterman did some extensive testing and found them wanting....
See his Web site for the writeup.
Reply With Quote
Old 07-22-2014, 10:04 PM
Warbirdsolutions Warbirdsolutions is offline
Join Date: Oct 2012
Location: Prospect, KY
Posts: 68
Default Thanks Guys

The airplane this is going into is actually a Rocket but powered by a Lycon built new 10-1 comp parallel valve IO-360. It has the Superior cold air sump and AirFlow Perf servo facing forward. I had a 6 into 1 system by Sky Dynamics in my last 6 cyl Rocket and loved it. I have never seen the 4 into 1 or 4 pipe system in real life. I have read the Vetterman comparison and it seems that they are all fairly similar. So - I'm hoping to get some real life feedback from those of you actually operating these 2 exhaust systems. I imagine the 4 pipe system would sound great and probably perform pretty well.
Thanks a million for your thoughts and opinions!
Reply With Quote
Old 07-23-2014, 08:22 AM
RVbySDI's Avatar
RVbySDI RVbySDI is online now
Join Date: May 2005
Location: Tuttle, Oklahoma
Posts: 2,571

I cannot give you any comparisons but I have the Vetterman 4-pipe exhaust on my ECI IO-340 with forward facing cold air induction. It performs as advertised. It does take up more space in the exit tunnel but does look cool sticking out the bottom. The plane has never flown without me in the left seat but others tell me it sounds pretty awesome from the ground.

Live Long And Prosper! 🖖🏻
Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

All times are GMT -6. The time now is 10:14 PM.

The VAFForums come to you courtesy Delta Romeo, LLC. By viewing and participating in them you agree to build your plane using standardized methods and practices and to fly it safely and in accordance with the laws governing the country you are located in.