396 LSx motor??
396 LSx motor?? Engine displacement=8(pi)*((Bore^2)/4)*stroke.....Thus leaving me with a 4.00" stroke and a 3.9694" piston bore. This project is souly ment for nostalgia purposes....but I needed some imput as far as proper stroke to piston size. What was the original...and what forged parts are available.
Mine is a 3.905 bore and 4.125 stroke. Most people don't like this set up because of the extended stroke (unsquare).
I agree with Z28mcCrory in saying that I would stay with the stock stroke and either get an LS2 (or resleeved LS1) and bore it out to its appropriate bore.
I agree with Z28mcCrory in saying that I would stay with the stock stroke and either get an LS2 (or resleeved LS1) and bore it out to its appropriate bore.
Mine is a 3.905 bore and 4.125 stroke. Most people don't like this set up because of the extended stroke (unsquare).
I agree with Z28mcCrory in saying that I would stay with the stock stroke and either get an LS2 (or resleeved LS1) and bore it out to its appropriate bore.
I agree with Z28mcCrory in saying that I would stay with the stock stroke and either get an LS2 (or resleeved LS1) and bore it out to its appropriate bore.
As for squareness, it is often thought as being better to have a bigger bore than stroke. Tons of topics on here if you search.
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I purchased the complete rotating ***'y as a kit from Lunati:
http://store.summitracing.com/partde...rsview=sku&Ns=
http://store.summitracing.com/partde...rsview=sku&Ns=
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Teching In
Joined: Aug 2007
Posts: 48
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From: Calgary Alberta Canada
Oversquare would be when your bore is larger than your stroke.
i.e. LS1 3.62" stroke with a 3.90" bore, or you can determine if you divide the 2 numbers bore over stroke. You must have result larger than 1 to be over
square. 3.90/3.62 = 1.07
Undersquare would be when your bore is smaller than your stroke.
i.e 396 stroked LS1 with a 3.97" bore and a 4" stroke.
3.97/4.00=0.99 Result is smaller than 1 therefore undersquare.
Arthur
Teching In
Joined: Aug 2007
Posts: 48
Likes: 0
From: Calgary Alberta Canada
There really is no power advantage to either design. Where they differ is in how that power is produced. Usually, a 'stroker' (undersquare) makes it's maximum hp/torque #'s at a lower rpm. An oversquare motor of equal displacement can produce the same power, but would require much higher rpm to reach the power band.
So basically your talking about stoke vs bore....the small the stroke the higher the RPM you can turn due to the decrease piston speed...meaning higher power band, verses a bigger stroker motor.
Teching In
Joined: Aug 2007
Posts: 48
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From: Calgary Alberta Canada
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Joined: Sep 2004
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From: Houston
The closest I think youre gonna get is to use a 5.3 litre block and use a ls1 3.960 piston (which scoggins sells) and a 4 inch bore crank with a 6.125 rod...that make like a 394ci. Or you can go stock bore 6.0 iron block with the same crank and rods as above...thats a 402...But honestly if your gonna spend the money to put a motor in a car i would do something thats gonna make some big power. like an iron block 414 or something...Utilize the new 4.125 and 4.200 cranks in the 6.0 iron block with a common piston like a 4.030
