Dumb question: what the heck are siamesed cylinders?
12-03-2000, 05:02 AM
#1
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Car: 1988 GTA
Engine: 5.0 TPI
Transmission: T5
Axle/Gears: 9 Bolt, 3.45
Dumb question: what the heck are siamesed cylinders?
I keep hearing people say the 400 has siamesed cylinders - what the hell is that? I have also heard of siamesed runners for TPI. Same thing??? One guy told me that a 400s cylinder walls arent thinner than a 350s because of he siamesed cylinders. I find this hard ot belive since the bore is bigger, and the block is the same size.
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1983 Pontiac Firebird SE
LG4-Based Chevy 400
700R4 Tansmission
Modified 4 Barrel Q-Jet Carb
Accel Super Stock 8mm Wires
Edelbrock Pro-Flo Air Cleaner
3.23 Posi Rear
14X7" Cragar SS/T Wheels
35X4 CD/AM/FM Head Unit
100WX2 Amp
2 Pioneer 12" Subs in Custom Box
Third Gen Performance
[This message has been edited by Ward (edited December 03, 2000).]
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1983 Pontiac Firebird SE
LG4-Based Chevy 400
700R4 Tansmission
Modified 4 Barrel Q-Jet Carb
Accel Super Stock 8mm Wires
Edelbrock Pro-Flo Air Cleaner
3.23 Posi Rear
14X7" Cragar SS/T Wheels
35X4 CD/AM/FM Head Unit
100WX2 Amp
2 Pioneer 12" Subs in Custom Box
Third Gen Performance
[This message has been edited by Ward (edited December 03, 2000).]
12-03-2000, 10:08 AM
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Car: 89 IROC
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The term siamezed runners refers to the fact that pairs of runner tubes are connected through part of their length by cutting away the thin wall between them. The stock runners on a TPI system are all individual tubes, which gives an overall runner length of roughly 17 inches. By connecting pairs of runner tubes together, this length is reduced slightly and the plenum volume is increased slightly. Both of these changes tend to increase the upper rpm flow capability of the runners.
12-03-2000, 01:32 PM
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Car: 89 IROC
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Transmission: That, too.
??
I thought Ede did an adequate job of answering Ward's question regarding the definition of siamesed cylinders. I thought that I would answer his question regarding siamezed runners.
??
I thought Ede did an adequate job of answering Ward's question regarding the definition of siamesed cylinders. I thought that I would answer his question regarding siamezed runners.
??
12-03-2000, 05:55 PM
#6
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Dale i thought it was you that mess up 
. actually just to make sure i sent this thread to jester and he couldn't figure out what the problem was either.
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-=ICON MOTORSPORTS=-
1st & 3rd
. actually just to make sure i sent this thread to jester and he couldn't figure out what the problem was either.------------------
-=ICON MOTORSPORTS=-
1st & 3rd
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