Motor Info needed (reference heads and cam)
Thread Starter
Drifting
Joined: Sep 2002
Posts: 1,614
Likes: 7
From: South Florida
Motor Info needed (reference heads and cam)
What is a stroker motor? I read about increasing displacement by increasing the stroke. Is this machining or just chaning the crankshaft? What are the advantages and disadvantages of this mod?
How do some of the tuners get more power out of an LS1 with heads and cam upgrade than an LS6 does? What are the drawbacks to changing the heads and cam? Gas mileage? Longevity of motor? Fit of seals, etc?
Is there a standardized difference between Stage I, II, or III heads or does each manufacturer make up their own meaning?
How do some of the tuners get more power out of an LS1 with heads and cam upgrade than an LS6 does? What are the drawbacks to changing the heads and cam? Gas mileage? Longevity of motor? Fit of seals, etc?
Is there a standardized difference between Stage I, II, or III heads or does each manufacturer make up their own meaning?
Supporting Vendor
Joined: Mar 2002
Posts: 2,073
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From: Loveland CO
Re: Motor Info needed (SpyRacing)
With my heads and cam my gas mileage increased on the highway but decreased in town. i am not sure why. It dynoed at 422 rwhp so that equates to 505 at the fly. I am not positive on this but i think the stages mean different size valves and better flowing. I am sure someone will chime in w/ better info then that. Kaley
Safety Car
Joined: Jul 2001
Posts: 4,661
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From: Ocean Springs MS
Re: Motor Info needed (SpyRacing)
Strokers are increased displacement motors using longer stroke cranks. In the LS1, they are usually new forged units, as the cranks are different from previous generation SBCs. More displacement equals more power, and longer stroke means lots more torque. If it's built by a good shop, it can be just as reliable as stock. The other choice for increasing displacement is increasing bore. This is harder on an LS1, as the block has to be resleeved to get much of an increase or you buy a C5R big-bore block $$$$$. Recently, a lot of new resleeved big-bore blocks have been showing up, but they are expensive (not as bad as a C5R block)
Head stages: Each shop has it's own definition, but generally, Stage 1 is a stock head with a porting work, Stage 2 adds bigger valves, and more extensive porting, Stage 3 is for big-bore engines and has the combustion chambers worked to allow even bigger valves with the bigger bore.
Head stages: Each shop has it's own definition, but generally, Stage 1 is a stock head with a porting work, Stage 2 adds bigger valves, and more extensive porting, Stage 3 is for big-bore engines and has the combustion chambers worked to allow even bigger valves with the bigger bore.
Burning Brakes
Joined: Jul 2003
Posts: 1,104
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From: "In a van down by the river" CO
Re: Motor Info needed (SpyRacing)
Stroke refers to amount the piston moves in the cylinder. A longer stroke engine displaces (cubic inches) more air. Stroking can be accomplished by either swapping in a crank with longer throws (stroke) or by offset grinding the crank journals (requiring either rod bearing spacers or new rods w/ shorter diameter rod ends). Chris
