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View Full Version : Almost finished...Almost.

Paul Workman
05-11-2009, 09:50 PM
My "entry fee" to the FBI is almost at hand (and I can't wait!!). The porting is done, the engine is back together, sans the plenum and TB (set aside for painting).

Below is the 3" system laid out, ready to be fitted in place...

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/StainlessWorks2001Large.jpg

Per Phil's system, the chambered "mufflers (used as resonators in this experiment) will be fitted between the SW "X" pipe and the muffler links. Those chambered mufflers are a full 3" inside diameter with "cheese shreader" walls.

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/StainlessWorks2002Large.jpg

The only part that isn't 100% 3" is the mufflers...They neck down to 2-1/2" going in. (I wonder if that can't be "opened up to 3").

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/StainlessWorks2003Large.jpg

View from the input side...

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/StainlessWorks2005Large.jpg

And from the output side. Note the twin pipes are just under 2" in diameter. 2 x the square root of the individual diameters results in 2-7/8 "equivalent cross sectional area. Considering a Corsa is 2-1/2" in diameter throughout, AND they seem to make good power, I hoping this necking down at the end of the tail pipe system won't be a big detractor. BUT! everything is on slip fittings, so I can play "mix and match" to get it right.

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/StainlessWorks2006Large.jpg

Last but not least, because I had to have some welding done, the plenum had to be painted. After much deliberation, I decided to try silver. So, I "rattle canned" the intake to get a feel for how it will look when done later professionally. For now, it looks pretty good to a blind man on a galloping horse. So, for this season I'll live with a rattle-can job. (Truth be known, it looks waaay better than the greanish-gray my engine paint has become, over the years). See what you think. (I think it will be a LOT easier to keep clean, especially since I live on a dirt road and dust is a never-ending chore, round here!)

http://i185.photobucket.com/albums/x220/6PPC_bucket/tech%20files/StainlessWorks2008Large.jpg

Gettin' so close I can taste it!! The exhaust might "follow on" in a week or so, but "fer sher", barring the unexpected, I'm gonna try to get it fired up.

More later.

P.
LGAFF
05-11-2009, 10:25 PM
Paul do you leave that exhaust sitting out in the yard overnight?....if so I need directions to your house.
jonszr1
05-11-2009, 10:41 PM
paul , i doubt that the necking down at the mufflers will cause you any power at all .
-=Jeff=-
05-11-2009, 11:45 PM
Paul what are you planning on doing with the Magnaflow X and Resonator?

even though it necks down I may be interested in it
Paul Workman
05-12-2009, 04:33 AM
Paul what are you planning on doing with the Magnaflow X and Resonator?

even though it necks down I may be interested in it

Oh, I'll make ya "such a deal" if ya want 'em.;)

P.
-=Jeff=-
05-12-2009, 10:24 AM
Oh, I'll make ya "such a deal" if ya want 'em.;)

P.

PM me with details.. that might flow better then the Borla Resonator
XfireZ51
05-12-2009, 01:32 PM
Paul,

Marc H has said more than once that a 2.5" Corsa v. something 3" makes virtually no difference in hp. In fact, I think he's said that it may make more. Similar to the diff between headers at 1 7/8" v 2".
Paul Workman
05-12-2009, 05:47 PM
Paul,

Marc H has said more than once that a 2.5" Corsa v. something 3" makes virtually no difference in hp. In fact, I think he's said that it may make more. Similar to the diff between headers at 1 7/8" v 2".

Yes, Marc and I touched on this a bit. I wouldn't dispute anything Marc says :worship: However, what is not clear to me is "why"? And, from Marc's web site, he compares the Corsa 2-1/2 with the B&B 3" and points out a couple possible reasons why the B&B might suffer in spite of the larger size, overall.
For example, he show how the new B&B muffler is significantly baffled, AND the resonator pipes are 1.625 in diameter :jawdrop: (This might be why you didn't see any significant power loss when switching to the Magnaflow, as at least the resonator AND the mufflers appear to be much more open in those respects than the B&B, no?)

http://www.zr1specialist.com/HAT%20Web/Tech%20Info/corsa%20vs%20b&b.htm

So, I don't know if we're comparing apples to apples between the Corsa and B&B. It would appear the Corsa is hands down more open from end to end that the B&B, especially at the resonator! So, extrapolating a bit, if the Corsa does in fact result in more hp due to less actual restriction, then maybe a little less would be even better...Maybe. I'm hoping the dyno can shed some light on it.

P.
DMark
05-12-2009, 09:53 PM
..... I live on a dirt road.....
:jawdrop: