S2000 Under The Hood S2000 Technical and Mechanical discussions.

Why does my AP1 flywheel weigh 17 lbs?

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Old 11-06-2010, 11:33 AM
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The back of the F20C2 MY'00.
Looking at all the flywheels its clear where the "fat" is on the F22 flywheel.

300sx Posted on Nov 6 2010, 07:43 PM
... you aren't in the US...
The flag didn't give it away?


I want to see someone weigh a 02-03 US flywheel!
So you're saying/thinking Honda put 17 lbs OEM flywheels on USDM F20Cx engines?
The flywheels posted by hybridspl sure look different.
The back looks like the F20, but the starterring is in a different position.
Its not all about the weight.

Btw.. isn't it funny people around the world measure their flywheels, start taking pics of flywheels (even on bathroom sinks next to the toothpaste! ), only because of a post on a forum.

Old 11-06-2010, 11:44 AM
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Anyone listening in here have an AP2 with an AP1 flywheel? I've been thinking about doing this but always think that a lighter flywheel will make me lose some of my launch power... Heavier rotating mass = harder launch theory?
Old 11-06-2010, 12:29 PM
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Originally Posted by CharlesAP2K,Nov 6 2010, 11:44 AM
Anyone listening in here have an AP2 with an AP1 flywheel? I've been thinking about doing this but always think that a lighter flywheel will make me lose some of my launch power... Heavier rotating mass = harder launch theory?
I have an AP2 with an 8lb flywheel. I get off the line much more quickly because there is less lag after my RPMs stabilize and start climbing in first gear. With either flywheel, I was traction limited.
Old 11-06-2010, 12:48 PM
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Alright, now I am really confused! My ring gear if flush with the friction side and has a chamfer that also faces the friction side. Exactly opposite of the first flywheel that SpitfireS posted, as if the ring gear was put on upside down (not surprising for an aftermarket part!)


Old 11-06-2010, 12:50 PM
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Originally Posted by CharlesAP2K,Nov 6 2010, 03:44 PM
Anyone listening in here have an AP2 with an AP1 flywheel? I've been thinking about doing this but always think that a lighter flywheel will make me lose some of my launch power... Heavier rotating mass = harder launch theory?
I have and AP1.5 flywheel that will be halfway between the two if you are scared to commit
Old 11-06-2010, 01:33 PM
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Originally Posted by hybridspl,Nov 6 2010, 12:50 PM
I have and AP1.5 flywheel that will be halfway between the two if you are scared to commit
Old 11-06-2010, 03:31 PM
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[QUOTE=SpitfireS,Nov 6 2010, 11:33 AM]
Btw.. isn't it funny people around the world measure their flywheels, start taking pics of flywheels (even on bathroom sinks next to the toothpaste!
Old 11-07-2010, 12:43 AM
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These differences between the flywheels are new to me.

My OEMAP1 was 6.4Kg after some work done it is 4.5Kg.
That seems to be half of an AP2 flywheel
Old 11-07-2010, 01:50 AM
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Look at the differences with the IMG_1208.
More clear than in the first picture hybridspl posted, with all the rust.

The flywheel in question is IMO not an OEM F20/F22 flywheel.
In any way.
(doesn't make it bad, I mean, the engine ran ok with it.. right?)

Old 11-07-2010, 04:42 AM
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After looking again, I have lots of AP1 and AP2 flywheels. The flywheel in the original picture does not look like either of them. It seems there is a third part number, or aftermarket flywheel.


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