IRWIN PIPE OUTLET SIZE

[waterbug]

I have a older used Irwin pipe with a angled inlet and what seems to be a large outlet to me . For a good starting point !! Can someone tell me the best outlet size for this pipe and stinger length on a Mod K&B ??

I have to play catch-up very quickly !!! I have missed my two throw-a-way races, in a best of 5 out of 7 race schedule . HELP !!!

 

[lohring]

What engine is it on? My 3.5 Irwin stinger is sleeved to .250 and the 7.5 is sleeved to .317 with a 707 Specialties cone muffler. This has worked for K&B 3.5 and 7.5 engines. I'm testing the 3.5 pipe on a MAC 21 now, and it seems ok.

Lohring Miller

 

[Slideblues]

Yep, simple and neat and it builds the heat, little JB weld and yer done:

 

[topfuel443]

Hey Gener, How does the water injected exauhst work on the outboard? ~ James

PS I have heard about that purple Carb......What was so great about them? whats the throat ID?

 

[waterbug]

THANKS LOHRING and GENE !!!!!!!!

Lets see the stinger outlet inside diameter is .3805 and its on a K&B 3.5 with a head clearance of minus .0059 !! he!he!he! would it be benefical to shave the head button or just shim it up ??

THANKS AGAIN

 

[Slideblues]

Hey James,

Never tried the water injection, I have a pressure tap on my header cause the CF pipe I had did not have one, capped it off when I ran the Irwin.

Purple carb bore is .340 just a smidge smaller than the red carb, always thought the red carb was too big for a 3.5, had good results with the purple for SAW.

Gene ;D

 

[topfuel443]

Sorry Gene, looked like from the pick that the water coming out of the head was going into the pipe. I have installed many water injection systems on racing Jet skis (back in my technician days for Yamaha) It would be installed directly into the expansion chamber controlled by a solenoid valve......not real sure what the theory was, cant remember, something about more dense air charge...blahblahblah. Ring a bell with anyone???

~ James

 

[Gattorno]

Slideblues

Greeting

Can you send more details pics of your pipe installed please my friend

Gatt.

 

[Slideblues]

Got these, Irwin from a different angle:

 

[Slideblues]

And this is the carbon fiber pipe I ran last year: