[G AE82]

Does anyone know if any aftermarket piston manufacturers make a piston that is specificaly for a k24a2 tsx engine using the tsx head?

 

[nikos]

THE TSX HEAD AND THE K20a2 don't have any major differences when it comes to pistons. I believe both heads have 49cc chambers.

 

[G AE82]

That's good to know. Thanks for that. I've been told the valve angle is slightly different so valve reliefs will be different for an equivalent aftermarket piston to the k24/k20 hybrid piston. Anyone built a hi comp k24a2?

 

[6spd_EK]

there is no difference in valve angle, at least with the older k24s. I'm not sure on the '08 or '09 models

I had wiseco 89mm k24 13.7:1 cr pistons...according to wiseco's site the same pistons could be used in a k20 for a 11.7:1 cr

 

[Jas9848]

there is no difference in valve angle, at least with the older k24s. I'm not sure on the '08 or '09 models

I had wiseco 89mm k24 13.7:1 cr pistons...according to wiseco's site the same pistons could be used in a k20 for a 11.7:1 cr

Yea that's what I've been wondering...everything I've seen lately has been stating that all the K heads have 50.5cc chambers, but why is the compression 2 points higher when a k20 is slapped on a k24 block than it is in a k20? I have been searching for the past few days and can't find a definant answer. Any help or info would be greatly appreciated. Thanks

 

[G AE82]

there is no difference in valve angle, at least with the older k24s. I'm not sure on the '08 or '09 models

I had wiseco 89mm k24 13.7:1 cr pistons...according to wiseco's site the same pistons could be used in a k20 for a 11.7:1 cr

So you have built a k24a2 with the original k24a2 head? How much VTC could you run?

 

[6spd_EK]

but why is the compression 2 points higher when a k20 is slapped on a k24 block than it is in a k20? I have been searching for the past few days and can't find a definant answer. Any help or info would be greatly appreciated. Thanks

stroke of 99mm vs 86mm

using math (fractions) 11.7/13.7 roughly equals 86/99

So you have built a k24a2 with the original k24a2 head? How much VTC could you run?

I have not built a k24a2 yet... I only owned a set of pistons. how much VTC depends on heavily on cams, piston reliefs, was the head milled? block decked?... in other words clay the motor & find out for your specific case.

 

[Jas9848]

stroke of 99mm vs 86mm

using math (fractions) 11.7/13.7 roughly equals 86/99



I have not built a k24a2 yet... I only owned a set of pistons. how much VTC depends on heavily on cams, piston reliefs, was the head milled? block decked?... in other words clay the motor & find out for your specific case.

wouldn't the difference in block heights compensate for the the stroke? i just cant figure out how they are doing their calculations i guess. all the online compression calculator programs come up with a different number

 

[6spd_EK]

the 19.7mm taller deck allows for the longer stronger stroke.... there is no compensating. without the taller deck the piston would go thru the combustion chamber & compression would be 0 lol

over simplified - if you have a 4 ft tube of air & a 3ft tube (same diameters) of air & compress each into the same sized chamber, the air from the 4ft will be 1.3333 times more compressed

 

[Jas9848]

ok so the longer storke makes the compression higher. just seemed too confusing for me to process at the moment. lol