Flywheel difference ???

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Nov 13, 2006 | 12:01 AM

67-435

Thread Starter

8th Gear

Joined: Mar 2006

Posts: 8

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From: Clinton Township Michigan

Flywheel difference ???

Hi,

Can anyone tell me the difference between a 3991406 flywheel and a 3856579.

Thanks

Nov 13, 2006 | 01:13 PM

JohnZ

Team Owner

Joined: Oct 2000

Posts: 38,897

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From: Washington Michigan

Same part. That's the lightweight 15# 12-3/4" 153-tooth neutral-balance nodular iron flywheel that only accepts a 10.5" clutch. Started out as P/N 3866735 (casting #3856579), changed to P/N 3991406, changed again to P/N 14085720 (casting #14085721).

Nov 13, 2006 | 05:44 PM

63 340HP

Team Owner

Joined: Nov 2005

Posts: 28,222

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From: Beach & High Desert Southern California

Is there any recommendation regarding the maximum safe rpm for this flywheel?

Thanks.

Nov 13, 2006 | 06:23 PM

ghostrider20

Le Mans Master

Joined: Jan 2002

Posts: 8,913

Likes: 283

Well, my L-88 15lb wheel has been to 7200, (327/365)

I love it, I will never go back. The L-88 flywheel is great.

Mark

Nov 13, 2006 | 06:46 PM

C64BOB

Racer

Joined: Jun 2006

Posts: 309

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Quote:

Originally Posted by ghostrider20

Well, my L-88 15lb wheel has been to 7200, (327/365)

I love it, I will never go back. The L-88 flywheel is great.

Mark

Both of mine ( I have a spare) have seen 8000+. This is a nice part and the faces wear flat. Light weight steel flywheels always seem to flex enough that the faces wear weird.

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