log headers vs. full headers
07-21-2006, 09:36 AM
#21
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We made on a customers car a little over 650rwhp (~18psi)on an LT1 a few years back. BUT, at 14psi we had 45psi of backpressure. Swapping from log to a header style system dropped backpressure from 45 to 29. Car picked up a shade over 100rwhp. So something to think about....., also EGT's dropped down ~250deg.
Jose
Jose
07-21-2006, 10:21 AM
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Originally Posted by bowtieman81
If we are discussing truck manifolds then they will support very large power. I was thinking of a log manifold where both banks feed into a single log.
And yes, Parish8 put down 1011rwhp with a single log set-up and truck manifold similar to mine. He had a T88. You can go to 1320video to see the vid of it.
07-21-2006, 11:21 AM
#25
Originally Posted by JZ 97 SS 1500
We made on a customers car a little over 650rwhp (~18psi)on an LT1 a few years back. BUT, at 14psi we had 45psi of backpressure. Swapping from log to a header style system dropped backpressure from 45 to 29. Car picked up a shade over 100rwhp. So something to think about....., also EGT's dropped down ~250deg.
Mike
07-21-2006, 01:53 PM
#27
Originally Posted by JZ 97 SS 1500
Still stayed as a 3" and the exhaust was an SLP 2 on the left.
Mine: 363 cid, log header, T76GTS, 3" downpipe, 3.5" exhaust over the axle, no muffler.
Results: 18 psi boost, 34 psi backpressure.
Airboat: 377 cid, tubular headers, T76GTS, 3.5" downpipe only 2' long, no exhaust or muffler.
Results: 18 psi boost, 26 psi backpressure.
Perhaps my log header is a better design than most. It's 3" in diameter and 3 of the tubes merge into it. Only #1 T's in at 90 deg.
Mike
07-21-2006, 02:13 PM
#28
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Originally Posted by engineermike
That's interesting and doesn't reflect the results we got on mine versus the SBC 377.
Mine: 363 cid, log header, T76GTS, 3" downpipe, 3.5" exhaust over the axle, no muffler.
Results: 18 psi boost, 34 psi backpressure.
Airboat: 377 cid, tubular headers, T76GTS, 3.5" downpipe only 2' long, no exhaust or muffler.
Results: 18 psi boost, 26 psi backpressure.
Perhaps my log header is a better design than most. It's 3" in diameter and 3 of the tubes merge into it. Only #1 T's in at 90 deg.
Mike
Mine: 363 cid, log header, T76GTS, 3" downpipe, 3.5" exhaust over the axle, no muffler.
Results: 18 psi boost, 34 psi backpressure.
Airboat: 377 cid, tubular headers, T76GTS, 3.5" downpipe only 2' long, no exhaust or muffler.
Results: 18 psi boost, 26 psi backpressure.
Perhaps my log header is a better design than most. It's 3" in diameter and 3 of the tubes merge into it. Only #1 T's in at 90 deg.
Mike
3" log
. This was a 2.5" log .
07-22-2006, 01:05 AM
#30
In my first year, when I was in Caluclus, everyone said it was a "weed out class" and it would get easier.
In my second year, when I moved on to Statics and Dynamics, everyone said they were "weed out classes" and it would get easier after that.
In my third year, when I took Thermo, Heat Transfer, and Fluids, everyone said they were serious business now that I got all the easy stuff out of the way.
In the last year, I took Machine Design and many people struggled, though I took to it well since it was crank-slider (crank, rod, piston), cam lobes design
, etc. . .
The point is that no Semester of Engineering school is easy.
Mike
In my second year, when I moved on to Statics and Dynamics, everyone said they were "weed out classes" and it would get easier after that.
In my third year, when I took Thermo, Heat Transfer, and Fluids, everyone said they were serious business now that I got all the easy stuff out of the way.
In the last year, I took Machine Design and many people struggled, though I took to it well since it was crank-slider (crank, rod, piston), cam lobes design
, etc. . .The point is that no Semester of Engineering school is easy.
Mike
07-22-2006, 10:57 AM
#31
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Originally Posted by engineermike
In my first year, when I was in Caluclus, everyone said it was a "weed out class" and it would get easier.
In my second year, when I moved on to Statics and Dynamics, everyone said they were "weed out classes" and it would get easier after that.
In my third year, when I took Thermo, Heat Transfer, and Fluids, everyone said they were serious business now that I got all the easy stuff out of the way.
In the last year, I took Machine Design and many people struggled, though I took to it well since it was crank-slider (crank, rod, piston), cam lobes design, etc. . .
The point is that no Semester of Engineering school is easy.
Mike
In my second year, when I moved on to Statics and Dynamics, everyone said they were "weed out classes" and it would get easier after that.
In my third year, when I took Thermo, Heat Transfer, and Fluids, everyone said they were serious business now that I got all the easy stuff out of the way.
In the last year, I took Machine Design and many people struggled, though I took to it well since it was crank-slider (crank, rod, piston), cam lobes design
, etc. . .The point is that no Semester of Engineering school is easy.
Mike
07-22-2006, 12:09 PM
#32
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Was this a TTi LT1 log setup?
Originally Posted by JZ 97 SS 1500
We made on a customers car a little over 650rwhp (~18psi)on an LT1 a few years back. BUT, at 14psi we had 45psi of backpressure. Swapping from log to a header style system dropped backpressure from 45 to 29. Car picked up a shade over 100rwhp. So something to think about....., also EGT's dropped down ~250deg.
Jose
Jose
