1 3/4" longtubes vs 1 7/8" lontubes on stock ls1,chime in
#1
Launching!
Thread Starter
Join Date: Jan 2008
Location: unknown
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
1 3/4" longtubes vs 1 7/8" lontubes on stock ls1,chime in
If there is already a thread on this post it here
For the most part i know 1 3/4 lontubes add a great amount of power to a stock LS1 motor. But my questions is would 1 7/8" really be overkill. I feel they wont. I remember seeing a article somewhere and on a lsx motor the 1 7/8" longtubes actually achevied hp and tq gains at all rpms over the 1 3/4" longtubes. But i could be wrong that it was improved in all rpm ranges.
If you dont got facts with proof dont answer. Anyone can just post any answer. Please post any articles or info on this to show how 1 3/4" longtubes compare to 1 7/8".
At least once you have the 1 7/8" your set for when you want to do bigger heads.
I just saw a article in i think hot rod magazine and they did this test on a 572 and every time they went to a bigger primary the power gains improved. They went from 1 3/4", 1 7/8", 2", 2 1/4" and i think as big as 2 1/2". They gained i think 20hp from the biggest over the 1 3/4". Now i know this is a whole different motor. But the concept is the same. Bigger size primary seems to really help.
But the one thing is the way the exhaust flows out of stock ls1 heads into a 1 7/8" primary. Yea the 1 7/8" primary is bigger than the exhaust port on the heads but would it really affect the flow.
For the most part i know 1 3/4 lontubes add a great amount of power to a stock LS1 motor. But my questions is would 1 7/8" really be overkill. I feel they wont. I remember seeing a article somewhere and on a lsx motor the 1 7/8" longtubes actually achevied hp and tq gains at all rpms over the 1 3/4" longtubes. But i could be wrong that it was improved in all rpm ranges.
If you dont got facts with proof dont answer. Anyone can just post any answer. Please post any articles or info on this to show how 1 3/4" longtubes compare to 1 7/8".
At least once you have the 1 7/8" your set for when you want to do bigger heads.
I just saw a article in i think hot rod magazine and they did this test on a 572 and every time they went to a bigger primary the power gains improved. They went from 1 3/4", 1 7/8", 2", 2 1/4" and i think as big as 2 1/2". They gained i think 20hp from the biggest over the 1 3/4". Now i know this is a whole different motor. But the concept is the same. Bigger size primary seems to really help.
But the one thing is the way the exhaust flows out of stock ls1 heads into a 1 7/8" primary. Yea the 1 7/8" primary is bigger than the exhaust port on the heads but would it really affect the flow.
#3
Launching!
Thread Starter
Join Date: Jan 2008
Location: unknown
Posts: 233
Likes: 0
Received 0 Likes
on
0 Posts
#5
11 Second Club
Join Date: Dec 2007
Location: Charleston, SC
Posts: 868
Likes: 0
Received 0 Likes
on
0 Posts