Has anyone here used a lightened cranksahft on there h22a1???Was it worth the trouble??Any big differences in acceleration?Thanks!

 

I had a knife-edged/lightened H23 crank. Acceleration was pretty nuts I was at 8500 rpms in no time. I also had a CM flywheel at the time...it was ridiculous...

 

who lightened your crank? KMS lightens and balances them for $425. Did you have any extra vibration w/ your setup?

 

That would be tough to isolate. I had forged pistons that slapped, lumpy cams, and an underdrive pulley. who knows really...

 

KMS ******* kicks ***, they did my crank, shave almost 7 lbs off, plus with that lighweight aluminum flywheel, revs so fast, i have like zero turbo lag

 

The lightening and balancing on the H22a crnak I have only cost like 2 bills canadian...

 

who did yours satan?

 

A machine shop in toronto, likely Leitner and Bush, I just got it from the guy who runs Gilman Auto. He was going to put it in his F20B block but it doesn't fit. lucky for me.

 

What about reliablity wise?Does it become a fragile peice once its lightened?Thanks !

 

no, the lightening doesn't really affect the srtuctural integrity, all it is doind is shaving the giant counterweights

 

Where is KMS located?
and about how long did it take them?....well basically how long were you without your car?

 

KMS is in Covington GA, website is http://www.honda-performance.com ... i was without my car for about 9 months, but the crank was only gone for about a month..... now, just to pull out your crank and lighten it would be pointless, i was building my engine, so i twas easy, you will have to pull the engine and disassemble it to have the crank knife-edged

 

Well.....don't shave it if you are worried. I'd like to say it doesn't do anything, but you have to trust your machine shop. It has to be perfectly balance.

The main 'loss' so to speak is inertia. Off the line the car will not have much inertia to carry it forward, so you'll find yourself revving higher to get the car going cause once the clutch plate hits and the crank tries to turn the wheels the revs drop pretty quick. Upside is once the crank is moving it spins up much faster.

So on a track/highway/cruising power pickup is excellent

 

thats kinda tru and kinda not, i mean you do lose the force but u dont loose much, when u hold ur rev at 2000 your motor is making power at 2000 rpm's and when u engage your tranny(drop ur clutch) ur still holding at 2000 untill u get traction so the power ur engine is making at 2000 stays weather u have a heavy or a light crank/flyweel/rim/ ect ect.


...and if u didnt get that. let me try to convince you this way. why do u want a 10 lb rim over a 20lb rim? less inertia, same reason we want lightend crank's and stuff. it takes less to turn the rim so therefore more power is transefred to the ground. so teqnicaly, rims "make" horespower just as much as pullys "make" power.

 

he's not saying anything about horsepower. hp stays the same. what satan said about the crank lowering inertia leading you to rev higher is completely true. it's physics. read SCC's last installment from project 300zx and you'll see that they picked parts like the clutch and flywheel assembly that were way too light for off-the-line times.

 

well I'll just dump it from 7000 rpms....no problems!

Ask S2000 guys, they will tell you how they have to clutch dump from 7000+ just to launch the car.

 

is 425 lightened, balanced, and knife edged?

 

yes

 

damnit not the **** keeps on adding up..

sleeves 900
rods 600
pistons 550
crank 465
gasket kit 300
oil pump 500 (new one with pro drive gear)
water pump 100
timing belt 45
grrrr

 

You can take off too much weight on the crank. Those counterweights are there for a reason, and that is to counter the weight of the piston and rod.

 

No you are wrong dude. If you are holding the rpms at 2000rpms and engage the clutch it will BOG huge, the less inertia created by the lightened crankshaft will slow it down such that you will be pushing hard on the throttle to get it to get back up in rpms.

It does not transfer more power to the ground, all it does is allows you to move through your powerband faster. You make the same power, maybe you just think it is more power because you may hit your peak hp faster?

 

yes u will bog at 2k with a lighnted crank over a non lightendd one, but were talking right off the line here, i would think a lighnted crank would im prove 60' times becasue the benifts of the extra power going to the ground after the first drop it, also i think its driving skill, getting to know how to launch w\ lightend stuff would take getting usda, maybe launch higer but let off for a second or something. who knows i dont have a lighned crank so i cant talk.

 

Verified. My best friend's dumping his 2k1 S2000 at almost 8K at the track just to get a decent launch; some other peeps recommend dumping it at like 8500. Sidenote/warning, he's getting his 2nd clutch put in this week at only 7500 miles.