Irwin/ Cooper S pipe

[Brandon Atwell]

Hey guys,
Just snagged one of these pipes, just looking for some feedback. Initially it will be going on a Novarossi 35Plus, more than likely ending up on A rear exhaust engine later on though (hopefully).
Given that this is the short pipe, can I make up for the difference in length with a longer header? Looking at the long style it appears the only difference was an extended inlet tube. If it doesn’t work out, anyone have a long style they’d be willing to part with?
Performance wise how do these pipes stack up? Reading back a few years it seems these were the money designs on the wrap around novas. Any prop suggestions?

Thanks everyone!
-Brandon

 

[Terry Keeley]

What's it going on?

 

[Brandon Atwell]

35Plus with the 14.5 MM crank in my Rico .21 rigger initially
Possibly a Beta EVO in the spring

 

[Brian Sorgente]

Its a good pipe, I wouldn't be overly concerned about running a longer header on a rear exhaust engine. Having the longer version would be ideal but it should still run well. I did the same thing years ago with the original Irwin pipes. First I started with a novarossi LS then later put it on a Mac21 inboard. I modified a damaged header and had a local shop tig weld a piece of aluminum tubing to to the flange extending its length. Worked like a charm. Its basically the same thing as 180 header, its just a straight tube instead of a bent one. Could always make a tapered header also...

Good luck,
Brian

 

[steve wood]

Rpm pipe. 1450 cut down,pitched up.keep it short on a 180 header/motor. Does not work on a dd!. When it hits the second stage,you should see 75+

 

[longballlumber]

Rpm pipe. 1450 cut down,pitched up.keep it short on a 180 header/motor. Does not work on a dd!. When it hits the second stage,you should see 75+

Steve,

Do you have a starting length for this pipe on a wrap around?

 

[steve wood]

as short as you can get it

 

[Brandon Atwell]

as short as you can get it

Lol, sounds like my brother setting up a 20 motor.

Thanks for the insight Steve!! Sounds like I need to get some prop work done soon! I’ll let you know how it goes once I get the pipe in!

 

[Terry Keeley]

Mine's at 8" on my little geared mono, revs to the moon!