^nice

 

Looks great guys, kudos on the great work and development.

Have they tested these to withstand engine heat and engine bay heat?

 

Heat not an issue as it relates to the cf according to builder and he has made other versions that have been in use for years

It was my first question

 

As long as it's a high heat epoxy (which it is) we're fine. The CF doesn't expand and contract like a metal so no issues with fatigue...

 

Will this benefit us with stock 3.6L engines?

 

Ranger,

I assume that 15rwhp is one your built motor. But will putting the OEM 4.0 plenum on an otherwise stock 3.6L motor have any gains (along with full exhaust and tune)?

Art

 

drool

 

I also see an ATI Super damper.....

 

I too am interested to at least hear theories on if something like this would help a stock displacement car.

I'm no expert but at some point there's a fine balance between volume and keeping flow velocity correct? - again that might sound like a stupid statement so I'd like to here opinions on it.

I know with my 996 vs. you 997 guys my heads are the big constraint...I've opened up the exhaust flow and considered the larger 997 throttle body but I worry all of that increased flow won't result in much due to my 996 heads being the restriction.

 

You're correct, improving airflow is chasing the next restriction. On the bigger engines the plenum runner volume became the restriction as shown in PJ's first post. And you're right, it is a balance between volume and port velocity. Typically engines are restricted more on the exhaust side than the intake side (there are exceptions, so don't roast me ).

So I'd say if you haven't at lease gone to headers without cats to help increase the exhaust side speed there isn't any reason to increase the intake side, there wouldn't be anywhere for the extra air to go in the cylinder.

If you've got the headers, exhaust and headwork, then this might help. It will change the power band slightly as the 3.6L has longer "runner" that are smaller in diameter...

Yeah, PJ took the pics on my engine...

See above, the 15rwhp was on Ranger's 4.2 and the stock 3.6L plenum was definitely a restriction with the exhaust work and cams they had in that beast!

 

Airflow aside, the CF plenum won't heat soak like the stock version. You should see a decrease in IAT which will help hp through more aggressive timing curve.

 

Any weight comparisons of this CF Plenum to stock and to stock 4.0 as well. Losing weight off the top of the engine is never a bad thing!

 

Purely guessing - it's less than half the weight of stock

 

Nice! That plenum is sexy.

 

very nice! work of art. can't wait to see the power gained after your tune.