New equal length 1.75" SS 32V headers-now ready for prime time
03-29-2010, 08:42 AM
#32
Nordschleife Master
Also, why is it important to have the collectors far forward and be able to install the second belly pan? Is this for dealing with certain "California-specific" issues?
03-29-2010, 11:20 AM
#33
Drifting
I wouldn't worry too much about the collectors being slip fit. The Akrapovic Ti exhaust on my sport bike is all slip fit. It assembles with a little bit of paste on the joints and doesn't leak. The collector on my turbo car was also slip fit and didn't have any leaking issues. It obviously saw much higher pressure at the joints than a NA engine would. Nice work.
03-29-2010, 01:49 PM
#34
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Equal length? Sweet. Is there an RPM range you're tuning for?
As a veteran of multiple Devek & 928 Intl header installs, those don't look too bad. I think I could get to all those nuts w/ a flex-head 13mm Gearwrench.
As a veteran of multiple Devek & 928 Intl header installs, those don't look too bad. I think I could get to all those nuts w/ a flex-head 13mm Gearwrench.
03-29-2010, 01:51 PM
#35
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03-29-2010, 01:55 PM
#36
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Greg,
I have a 5.0 l S 3 ROW engine with 80 mm throttle body from a S 2 , x-pipes and Porken´s chips.
I am thinking about camshafts with more lift and modified oil passages in the bottom.
I don´t like the flat HP curve over 5500 rpm.
I have a 5.0 l S 3 ROW engine with 80 mm throttle body from a S 2 , x-pipes and Porken´s chips.
I am thinking about camshafts with more lift and modified oil passages in the bottom.
I don´t like the flat HP curve over 5500 rpm.
Last edited by Darklands; 03-29-2010 at 02:53 PM.
03-29-2010, 02:12 PM
#37
Former Sponsor
I wanted the cats to be able to remain in the stock position.
This is not only a California issue.....
But, I see no point in building anything that encourages anyone to de-federalize any street driven car.
You also have to be a bit realistic....there's about a zillion street and race small block and big block Chevys with 4 into 1 systems, which make way more horsepower per cubic inch than we will ever dream about making...and they fire 5 & 7 immediately after one another.....
03-29-2010, 02:19 PM
#39
I like that the collectors are as far forward in the car as possible. It just makes lots of things easier/better, imho. And from the looks of it, they could be even shorter by a few inches or no?
03-29-2010, 05:12 PM
#40
Nordschleife Master
You also have to be a bit realistic....there's about a zillion street and race small block and big block Chevys with 4 into 1 systems, which make way more horsepower per cubic inch than we will ever dream about making...and they fire 5 & 7 immediately after one another.....
Best regards,
The Internet Engineer
Last edited by ptuomov; 03-29-2010 at 09:43 PM.
03-29-2010, 06:12 PM
#41
Nordschleife Master
Apropos of the hose thread, I thought I'd share some teaser pics of one of Greg's new projects.
After a metric ton of fitment and packaging issues, Greg's finalizing some 1-3/4" tuned equal length (within 1/4") stainless headers for 5 and 5.4L cars. These pics show the pre-production mockups made in mild steel, prior to being jigged for production in SS.
In the name of science these are going to go on a number of 5.0, 5.4 and 6.5L engines with some 'before and after' dyno numbers so there will be some good data on them.
Here are a couple of shots showing test fitment on William A's car. No problems with the steering box, MM heat shields. These will fit with the front belly pan on, the rear may need some small spacers
(It was all I could do not to bust out the histoclear and go to town on the cosmoline....)
After a metric ton of fitment and packaging issues, Greg's finalizing some 1-3/4" tuned equal length (within 1/4") stainless headers for 5 and 5.4L cars. These pics show the pre-production mockups made in mild steel, prior to being jigged for production in SS.
In the name of science these are going to go on a number of 5.0, 5.4 and 6.5L engines with some 'before and after' dyno numbers so there will be some good data on them.
Here are a couple of shots showing test fitment on William A's car. No problems with the steering box, MM heat shields. These will fit with the front belly pan on, the rear may need some small spacers
(It was all I could do not to bust out the histoclear and go to town on the cosmoline....)
Can I ask what the price point is? I'm going to assume north of $2,000. Am I close? Any idea as to projected cost per set?
I like that you designed these from the outset to fit under the belly pans. I also like that you can remove the clutch cover. Although I guess in a perfect world I wish you could remove the clutch cover without having to even touch the exhaust at all. It seems we would be able to access the clutch without having to remove the header's but it would still be required to remove the cats to be able to remove the collectors.
This is likely not a concern though for those with auto's
03-29-2010, 08:58 PM
#42
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That whole 4 into 1 and 4-2-1 thing is sort of a moot point, to me. The differences in output appear to be fairly insignificant. I set out to build a system that would fit into my own design parameters....if I built things around everybody else's whims, I'd need to build a custom exhaust system for every "internet" engineer out there.
I wanted the cats to be able to remain in the stock position.
This is not only a California issue.....
But, I see no point in building anything that encourages anyone to de-federalize any street driven car.
You also have to be a bit realistic....there's about a zillion street and race small block and big block Chevys with 4 into 1 systems, which make way more horsepower per cubic inch than we will ever dream about making...and they fire 5 & 7 immediately after one another.....
I wanted the cats to be able to remain in the stock position.
This is not only a California issue.....
But, I see no point in building anything that encourages anyone to de-federalize any street driven car.
You also have to be a bit realistic....there's about a zillion street and race small block and big block Chevys with 4 into 1 systems, which make way more horsepower per cubic inch than we will ever dream about making...and they fire 5 & 7 immediately after one another.....
nine out of ten times when you loose a head gasket or cam lobes on a SBC or a BBC it is going to be 5&7, not only are they together in the firing order the are adjacent in the block.
The slip fit on the collectors are not going to leak, or at least I have never had a issue with multi part headers leaking.
Try a set of Hooker super comps for a V8 Monza, the passenger side is in four parts. (IIRC)
03-29-2010, 09:35 PM
#43
Under the Lift
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Oh, so the colectors will stay slip-fit. In that case, it appears these headers might be able to stay on during and engine pull and drop.
03-30-2010, 12:51 PM
#45
Nordschleife Master
Bill's avatar is from Project 928 book.
I think that those headers look lovely.
If he has as much time into them as he is saying then it sounds like the price will be around $3500-4k a set. but that is mearly speculation.
I think that those headers look lovely.
If he has as much time into them as he is saying then it sounds like the price will be around $3500-4k a set. but that is mearly speculation.