3sgte 4th Options

[timdog1720]

is the 4th gen 3sgte a strong engine...better power over the others?

[azian_advanced]

actually, taller pistons cangive you the higher compression ratio while still maintaining the same bore and stroke and therefore displacement assuming both pent-roof head designs are the same.
i just did the math and it worked out for me. the end result turned out to be that the 4th gen pistons are 0.717 mm taller than the 3rd gen pistons.

This post has been edited by azian_advanced: Apr 22, 2011 - 3:03 PM

[Smaay]

actually, taller pistons cangive you the higher compression ratio while still maintaining the same bore and stroke and therefore displacement assuming both pent-roof head designs are the same.
i just did the math and it worked out for me. the end result turned out to be that the 4th gen pistons are 0.717 mm taller than the 3rd gen pistons.

you are correct. look at the Supra 2JZ-GTE and 2JZ-GE, they are both 3 liters, have the same bore and stroke, even have the same crank and rods. the GE has a higher comp piston than the GTE. the heads have NOTHING to do with compression ratio

If pistons were taller using the same bore and stroke you would have higher compression but less cc's.

1998cc and 86mm*86mm seems to be consistent throughout all 3s-* motors.

the bore and stroke is what determines the cc's. the volume between the top of the piston at TDC and head have nothing to do with it. you can verify it by doing this:

π * [(8.6cm/2)^2] * 8.6cm * 4 cylinders = 1998 cc's

taller pistons (or longer rods) will just shift the stroke closer to the head resulting in higher compression but won't affect its cc's.

you are right and wrong. shifting the stroke so the piston gets closer to the head means that it will travel farther away which increases displacement. thats exactly how you stroke the 2ZZ to 1.94L, you use the 1ZZ crank.