Stroking and redline
04-20-2004, 08:49 AM
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The '00 to '03 F20C motor has a 84mm stroke & 87mm bore.
The '04 motor has a 90.7mm stroke & 87mm bore.
The K20A has a 86mm stroke & 86mm bore.
My observation of this is that the block responds well to a bore that is equal to the stroke. The K20A is much more responsive to NA mods than the F20C is.
My question is this. Will the crank from the RSX fit in the S2000?
The '04 motor has a 90.7mm stroke & 87mm bore.
The K20A has a 86mm stroke & 86mm bore.
My observation of this is that the block responds well to a bore that is equal to the stroke. The K20A is much more responsive to NA mods than the F20C is.
My question is this. Will the crank from the RSX fit in the S2000?
04-20-2004, 09:01 AM
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If the K20A crank would fit, you could increase the displacement from 1996cc to 2044cc, and increase of 48cc.
The redline could also stay at 9000rpm since the K20A along with aftermarket ECU's redline at 9k. It's been proven to be reliable.
The redline could also stay at 9000rpm since the K20A along with aftermarket ECU's redline at 9k. It's been proven to be reliable.
04-20-2004, 09:19 AM
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Redline rpm is down to mechanical strength.
I dont know what the TODA kit uses for a crank but the rods are of what seems a forged nature and of a high quality steel alloy coupled with higher PSI rod bolts.
I cant imagine them designing a crank from new, and it does look like a factory steel item. Its probably gone under more intensive lightning and balancing to tighter tolerances than the facotry item.
With vibrations, if the out of balance weights across the plane of teh crank are the same, then the vibration forces will be the same no matter what the stroke and crank speed is. As speed and distance inscrease, the same weights will undergo the same G's and cancel out eachother to give the same vibratory forces.
SO why can the toda kit retain the std redline, simple diferences in the amount of time spent in preparation of the components, and the component quality.
The factory 2.2 could probably take 9k, but why should Honda take that risk when they can keep the engine at the same specific output.
And Ben, an over square engine will always make higher ultimate outputs than a perfectly square motor. The K20 is probably more responsive to traditional tuning methods because its in a lower state of tune as std and packaging restraints are more imposing on induction/exhaust systems.
Our BTCC series CTR's run a max allowable rpm of 8500 and a CR of 12.5:1 yet still make 270-290bhp whilst retaining a plenham setup, abiet a modified (int his case carbonfibre) plenham.
I dont know what the TODA kit uses for a crank but the rods are of what seems a forged nature and of a high quality steel alloy coupled with higher PSI rod bolts.
I cant imagine them designing a crank from new, and it does look like a factory steel item. Its probably gone under more intensive lightning and balancing to tighter tolerances than the facotry item.
With vibrations, if the out of balance weights across the plane of teh crank are the same, then the vibration forces will be the same no matter what the stroke and crank speed is. As speed and distance inscrease, the same weights will undergo the same G's and cancel out eachother to give the same vibratory forces.
SO why can the toda kit retain the std redline, simple diferences in the amount of time spent in preparation of the components, and the component quality.
The factory 2.2 could probably take 9k, but why should Honda take that risk when they can keep the engine at the same specific output.
And Ben, an over square engine will always make higher ultimate outputs than a perfectly square motor. The K20 is probably more responsive to traditional tuning methods because its in a lower state of tune as std and packaging restraints are more imposing on induction/exhaust systems.
Our BTCC series CTR's run a max allowable rpm of 8500 and a CR of 12.5:1 yet still make 270-290bhp whilst retaining a plenham setup, abiet a modified (int his case carbonfibre) plenham.
04-20-2004, 10:15 AM
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Originally posted by Big Ben
If the K20A crank would fit, you could increase the displacement from 1996cc to 2044cc, and increase of 48cc.
The redline could also stay at 9000rpm since the K20A along with aftermarket ECU's redline at 9k. It's been proven to be reliable.
If the K20A crank would fit, you could increase the displacement from 1996cc to 2044cc, and increase of 48cc.
The redline could also stay at 9000rpm since the K20A along with aftermarket ECU's redline at 9k. It's been proven to be reliable.
http://forums.s2ki.com/forums/showthread.p...light=tsx+crank
Alaniz also has some new S2000 parts coming to market soon http://www.alaniztechnologies.com/f20c1parts.html
04-20-2004, 10:45 AM
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Originally posted by TurboVtk
correct me if i am wrong, and prob am, wasnt the 04 engine increased by bore not stroke?
correct me if i am wrong, and prob am, wasnt the 04 engine increased by bore not stroke?
major plans now.!
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