which engine will spin easier? with the shorter stroke? or with the longer stroke?
which engine will spin easier? with the shorter stroke? or with the longer stroke? which engine will spin easier? a LSX engine with 4.125" bore and 4.00" stroke or a LSX engine with 4.125" bore and 4.1" stroke?
which engine would you recommend?
i know that there is no substitute for cubic inches but i prefer to gain those cubic inches in the bore more than the stroke, am i right here?
which engine would you recommend?
i know that there is no substitute for cubic inches but i prefer to gain those cubic inches in the bore more than the stroke, am i right here?
OK, got it some how, you mean the pistons are the weight and the crank stroke is the distance from the weight to the central point and it consumes more hp to spin the crank as the distance increases from the pistons to the central point which is the crank stroke.
but over all, which will make more power a 427ci LSX 4.125" bore and 4.00" stroke or a 440ci LSX which has 4.125" bore and 4.1" stroke?
ain't the 440ci LSX will make more power but the 427ci LSX will spin higher and easier?
but over all, which will make more power a 427ci LSX 4.125" bore and 4.00" stroke or a 440ci LSX which has 4.125" bore and 4.1" stroke?
ain't the 440ci LSX will make more power but the 427ci LSX will spin higher and easier?
6 & 8 Second Club
Joined: Aug 2006
Posts: 2,284
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From: Illinois, RT 66 dragway area
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I doubt I would worry about a tenth. You really don't start making dramatic changes until you get a bigger difference.
.25, .5, .75 ect. If everything is easy to get & ~same price, I would get the 4.100. Good luck.
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I doubt I would worry about a tenth. You really don't start making dramatic changes until you get a bigger difference.
.25, .5, .75 ect. If everything is easy to get & ~same price, I would get the 4.100. Good luck.
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11 Second Club
Joined: Jan 2007
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From: Pusan, ROK
To the OP though, neither should matter if you are just talking about what setup is better for your car. Get whatever setup that will give you the most cubic inches. It is best to have as much of both as you can in an LSX engine. Your valvetrain would probably be the limiting factor for how high you can spin the engine anyways, not your bottom end.
If you are wanting a technical discussion on whether bore or stroke is better, there are some good threads on that already.
6 & 8 Second Club
Joined: Aug 2006
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From: Illinois, RT 66 dragway area
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You gain power per total combination. If you increase bore, you increase HP due to free compression & more inch's.
Chamber stays the same, so the extra gas' get squeezed into the same size hole.
You also usually gain power by increasing head flow. Unshrouding the intake can make a huge difference with some heads.
Same as stroke, more compression & size increase HP, but you don't get more flow.
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You gain power per total combination. If you increase bore, you increase HP due to free compression & more inch's.
Chamber stays the same, so the extra gas' get squeezed into the same size hole.
You also usually gain power by increasing head flow. Unshrouding the intake can make a huge difference with some heads.
Same as stroke, more compression & size increase HP, but you don't get more flow.
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Verdad Gallardo so if i want to go stroker i will go with LS7 block and 440ci rotating assembly. yeah, i feel the 440ci is stronger than a 427ci.
now which heads you would go with? touched up GM LS7 heads and LS7 intake manifold? or touched up 235cc TFS heads and 92mm Fast?
now which heads you would go with? touched up GM LS7 heads and LS7 intake manifold? or touched up 235cc TFS heads and 92mm Fast?
TECH Enthusiast
Joined: Feb 2007
Posts: 650
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From: FL
Yes there are benefits to both and stroking you will pick up more TQ. I was just trying to gie him an everyday example of why it will be easier to spin the shorter stroked engine. (not necessarily that one is better than the other)
For example, look at a F1 car, they roughly have a stroke of 1.5" and turn 17,000rpms....of course they are limited to < 3L meaning the only way they can get that volume of air through the motor is spin the **** out of it. Basically you have to make a choice Low rpm stroker with low end or High rpm smaller stroke with the high end.
6 & 8 Second Club
Joined: Aug 2006
Posts: 2,284
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From: Illinois, RT 66 dragway area
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If you can afford the new block, you will never go with stock again.
The LSX block is one of the best pieces out there. That thing is strong as hell.
Compatible for 500" out of the box. I'm no expert, but everyone has loved it so far.
Good luck.
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If you can afford the new block, you will never go with stock again.
The LSX block is one of the best pieces out there. That thing is strong as hell.
Compatible for 500" out of the box. I'm no expert, but everyone has loved it so far.
Good luck.
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FormerVendor
Joined: Nov 2001
Posts: 3,065
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From: Houston, Tx.
Both can make similar power butyou could probably run a smaller cam with the LS7 stuff. Vengeance has made slightly more overall with the TFS stuff in several of their tests. I like them both.
and just think this is my 2nd post 
With a given amount of air, power will be the same on the same CI engines, whether they are undersquare or over square.
Generally speaking, the bigger the bore, the bigger amount of power possible, because of the ability to fit bigger valves in the head, and consequently move more air.
Teching In
Joined: Aug 2007
Posts: 48
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From: Calgary Alberta Canada
427 and 440 are both good options. I have witnessed both a TFS/F.A.S.T/440in a WS6 and a 427 in a Silverado. Both vehicles drive great and make phenomenal power. The truck has run a best E/T of 11.9 @ 112, the F-body I am unsure of. Wicked engine combinations either way.
Launching!
Joined: Mar 2007
Posts: 250
Likes: 1
From: SoCal
the shorter stroke engine will rev high and make really good hp up top
while the longer stroke engine will rev lower but make really good torque.
bore will typically give the hp u want while the longer stroke will give u more torque
it all depends on what u want.
while the longer stroke engine will rev lower but make really good torque.
bore will typically give the hp u want while the longer stroke will give u more torque
it all depends on what u want.
OK, i'm convinsed, when i want to go stroker i will go with a 440ci short block using LS7 block.
now i'm not sure on which heads and intake manifold to go with :
either the TFS 235cc and Fast 92mm intake manifold or the GM LS7 heads and LS7 intake manifold?
Ron@Vengeance said they obtained more power on 427ci and 440ci from TFS 235cc heads and Fast 92mm intake manifold more than the GM LS7 heads and GM LS7 intake manifold.
note that the CNC TFS 235cc heads flow 344cfm with a much smaller port 235cc and smaller valve 2.08 smaller than LS7 heads where the GM LS7 heads flow around 360cfm with a bigger port 255cc intake runner and big intake valve 2.20.
note that i like small efficient ports that flow good over huge ports that flow big numbers. i like port velocity much more than flow numbers.
i'm realy confused which heads to go with for a 440ci stroker, hand touched up CNC TFS 235cc or hand touched up GM LS7 heads?
now i'm not sure on which heads and intake manifold to go with :
either the TFS 235cc and Fast 92mm intake manifold or the GM LS7 heads and LS7 intake manifold?
Ron@Vengeance said they obtained more power on 427ci and 440ci from TFS 235cc heads and Fast 92mm intake manifold more than the GM LS7 heads and GM LS7 intake manifold.
note that the CNC TFS 235cc heads flow 344cfm with a much smaller port 235cc and smaller valve 2.08 smaller than LS7 heads where the GM LS7 heads flow around 360cfm with a bigger port 255cc intake runner and big intake valve 2.20.
note that i like small efficient ports that flow good over huge ports that flow big numbers. i like port velocity much more than flow numbers.
i'm realy confused which heads to go with for a 440ci stroker, hand touched up CNC TFS 235cc or hand touched up GM LS7 heads?
Last edited by Abdullah; Nov 1, 2008 at 05:09 AM.
true, the reason why u make more tq is because of the moving weight of the heavers crank and rods, look at it this was a eng with a 35lb flywheel makes 400 ftlbs of tq and makes 400 hp as well if u take that same eng and bolt a alum flywheel thats only 14lbs ur going to lose truning force(tq) so u might make 385ft lbs of tq but at the same time making 425hp with out chaning any thing but roating weight. now it gets realy tricky when i have a 13inch flywheel thats 20lbs and a fly wheel that 14 inches but is 19lbs with will make more tq? the 14 inch flywheel and just think this is my 2nd post
and just think this is my 2nd post
true, the reason why u make more tq is because of the moving weight of the heavers crank and rods, look at it this was a eng with a 35lb flywheel makes 400 ftlbs of tq and makes 400 hp as well if u take that same eng and bolt a alum flywheel thats only 14lbs ur going to lose truning force(tq) so u might make 385ft lbs of tq but at the same time making 425hp with out chaning any thing but roating weight. now it gets realy tricky when i have a 13inch flywheel thats 20lbs and a fly wheel that 14 inches but is 19lbs with will make more tq? the 14 inch flywheel and just think this is my 2nd post
and just think this is my 2nd post
Last edited by WKMCD; Nov 1, 2008 at 11:35 AM.