Stumbled across a possible 2"primary LSJ Header?..
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Joined: 04-23-08
Posts: 79
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From: PA
This header was fabbed up on a J-body L61, test fitted in Edubs 06 SS(before the final welding), and finally installed in a 03 Cav with Edubs old M62 set-up. There is no noticeable drop in low rpm torque or hp, but a nice gain up top. It has 2" O.D. primaries(about 1 7/8" I.D.) and a 3" collector, full 304 Stainless steel(including the LSJ header flange).
It is also mated to a full 3" exhaust and it was built with the anticipation of a TVS build on the cavalier.
They are available right now for purchase. You just have to get in touch with a sales rep from RD Fabs.
It is also mated to a full 3" exhaust and it was built with the anticipation of a TVS build on the cavalier.
They are available right now for purchase. You just have to get in touch with a sales rep from RD Fabs.
depends how much power you're pushing. it would be ideal for something like a 400-500whp cobalt, but if you're in the 200-300whp range, 1.75" primaries is plenty.
Senior Member
Joined: 10-06-05
Posts: 10,944
Likes: 2
From: Seneca, South Carolina
This header was fabbed up on a J-body L61, test fitted in Edubs 06 SS(before the final welding), and finally installed in a 03 Cav with Edubs old M62 set-up. There is no noticeable drop in low rpm torque or hp, but a nice gain up top. It has 2" O.D. primaries(about 1 7/8" I.D.) and a 3" collector, full 304 Stainless steel(including the LSJ header flange).
It is also mated to a full 3" exhaust and it was built with the anticipation of a TVS build on the cavalier.
They are available right now for purchase. You just have to get in touch with a sales rep from RD Fabs.
It is also mated to a full 3" exhaust and it was built with the anticipation of a TVS build on the cavalier.
They are available right now for purchase. You just have to get in touch with a sales rep from RD Fabs.
What did you think it would be inside? of course its smaller than 2", when was the last time a header got sold by its primary ID????
New Member
Joined: 08-08-07
Posts: 16
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From: Syracuse, NY
Well I am not here to plugg our products because it is against the rules here, however I was directed by a member from JBO to a guy here who has been dyno testing exhaust manifolds. Were are looking into see what is required of us to make this happen by the member on here, and I guess those numbers will then speak for itself.
As far as the diameter were talking about here, yes the tubing is 2" OD and then 16ga thickness which makes it 1 7/8ths. That's just how its sold from our supplier.
As far as the diameter were talking about here, yes the tubing is 2" OD and then 16ga thickness which makes it 1 7/8ths. That's just how its sold from our supplier.
Senior Member
Joined: 12-03-06
Posts: 1,791
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From: Merritt Island ,Fl
honestly it's not worth it think about this:
4 x 1.5" = 6" area for exhaust to travel through
4 x 1.75 = 7" area
4 x 2" = 8" area
all three of which, go right into at the biggest a 1 x 3" pipe. this is why i find it funny when people argue about how much better a 1.75" primary header is than a 1.5" primary header
the more volume you have, the slower the velocity. the slower the velocity, the less scavenging effect you have. so bigger on everything, isn't always better.
4 x 1.5" = 6" area for exhaust to travel through
4 x 1.75 = 7" area
4 x 2" = 8" area
all three of which, go right into at the biggest a 1 x 3" pipe. this is why i find it funny when people argue about how much better a 1.75" primary header is than a 1.5" primary header
the more volume you have, the slower the velocity. the slower the velocity, the less scavenging effect you have. so bigger on everything, isn't always better.2" primaries do seem large on a 2.0L engine until you think about how much power some guys are making on tvs,or nitrous, 3-400hp is a lot of air to move , you figuer a v8 makes 400hp while running 1-7/8 primeries ,but thats x 8 cylinders , theoretically you would need over 3" primers to flow the same amount of air on a 4cyl engine (excuse the gorilla math ) when you think of things volumetricly 2" really isnt that big.
Expect for the fact that Exhaust is pulsed ... engine exhaust isnt all crammed together into one pipe , each pusle form each cylinder is separated form one another,imagine each exhaust pulse fallowing another in a single file line ,and not side by side.
2" primaries do seem large on a 2.0L engine until you think about how much power some guys are making on tvs,or nitrous, 3-400hp is a lot of air to move , you figuer a v8 makes 400hp while running 1-7/8 primeries ,but thats x 8 cylinders , theoretically you would need over 3" primers to flow the same amount of air on a 4cyl engine (excuse the gorilla math ) when you think of things volumetricly 2" really isnt that big.
2" primaries do seem large on a 2.0L engine until you think about how much power some guys are making on tvs,or nitrous, 3-400hp is a lot of air to move , you figuer a v8 makes 400hp while running 1-7/8 primeries ,but thats x 8 cylinders , theoretically you would need over 3" primers to flow the same amount of air on a 4cyl engine (excuse the gorilla math ) when you think of things volumetricly 2" really isnt that big.
New Member
Joined: 08-08-07
Posts: 16
Likes: 0
From: Syracuse, NY
This is the crowd we are trying to appeal to, those looking to make some larger numbers where the current applications available just are not sufficient for their needs.
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