Lightweight Flywheel?

Reply Subscribe

Thread Tools

Search this Thread

May 15, 2006 | 12:51 PM

#21

Ironcross

Race Director

Joined: Nov 2002

Posts: 12,142

Likes: 54

From: Taylor Michigan

Quote:

Originally Posted by panchop

do you have a part number for that flywheel by any chance.

GM # 14085720, 15 lbs for a two piece main seal. fits 1955-1985 internally balanced engines. Besides fitting SB`s it is also the OEM flywheel for a L88 or ZL1

May 15, 2006 | 01:06 PM

#22

big_G

Le Mans Master

Joined: Jul 2005

Posts: 5,752

Likes: 4

From: Austin Texas

Quote:

Originally Posted by jackson

L88 flywheel is nodular iron and small at 153T ... weighs 15-16 # ... will bolt up to any 2-piece rear main seal crank sbc or BBC ... it is internal/neutral balance. Perfection Clutch/Zoom markets an asian clone of L88 fw ... available at local advance auto parts for about $65 new ... Perfection P/N 50-6516.

If it's replacing an internal/neutral balance fw on an internal/neutral balance motor ... fw nor motor does not need to be re-balanced.

Big cost savings over the L-88 piece ($169.95 @ Scoggins-Dickey). I wonder if the part is strong enough for street/strip use?

May 15, 2006 | 01:16 PM

#23

comp

Team Owner

Joined: Sep 2003

Posts: 88,393

Likes: 2

From: eville in

Quote:

Originally Posted by flynhi

My mechanic is telling me that 'll be OK with an alum flywheel since my 383 has plenty of low end torque to accelerate from a stop. I other words, I don't need all the rotating mass of a steel flywheel that engines with lower torque need.

Is he right?

i lean to say yes

May 15, 2006 | 01:32 PM

#24

Ironcross

Race Director

Joined: Nov 2002

Posts: 12,142

Likes: 54

From: Taylor Michigan

The aluminum flywheels will have to have a steel facing rivited to it for the clutch disc. Stick to the GM lightweight and be safe. The oveseas product may not be as good as far as safty unless your limited in RPM`s with a hydraulic cam. The GM product is for extreme high RPM`s.

May 15, 2006 | 05:04 PM

#25

jackson

Le Mans Master

Joined: Sep 2001

Posts: 7,739

Likes: 630

From: Unreconstructed, South Carolina

Quote:

Originally Posted by big_G

Big cost savings over the L-88 piece ($169.95 @ Scoggins-Dickey). I wonder if the part is strong enough for street/strip use?

I personally know of a dozen or more asian L88 fw locally ... all running in 3K lb asphalt circle trackers w/ 375+ hp, sticky slicks, locked axles & 7K rpm. I've personally installed several. I'm not aware of any fw explosion. I trust the asian iron L88 more than any aluminum piece; best is billet steel but they're big$.

Virtually any 2-pc neutral/internal balance flywheel can run on a 2-pc external crank ... simply bolt in the additional balance weight between crank & fw. ... so ... L88 flywheel can be run w/ external sbc 400 & bbc454 ... as long as bolt in weight is added. ... it looks a lot like a shim ... don't weight much at all ... bolt-in weight is unique for each 400 & 454.

May 15, 2006 | 11:51 PM

#26

63mako

Race Director

Joined: May 2005

Posts: 10,674

Likes: 122

From: Millington Illinois

St. Jude Donor '08-'09

Just bought an 11" flywheel @ 15 1/2 LBS for my build. E-Bay $151 shipped.

May 15, 2006 | 11:55 PM

#27

Ironcross

Race Director

Joined: Nov 2002

Posts: 12,142

Likes: 54

From: Taylor Michigan

Quote:

Originally Posted by jackson

Not much sence buying the shim to make a 427 flywheel fit a 454, GM flywheel part # 3963537 does just that and is also another lightweight 15 lb wheel specifically designed for the extreme HP of the LS7 454`s or will also even fit the little SB 400`s.

May 16, 2006 | 12:08 AM

#28

Ironcross

Race Director

Joined: Nov 2002

Posts: 12,142

Likes: 54

From: Taylor Michigan

Quote:

Originally Posted by 63mako

Just bought an 11" flywheel @ 15 1/2 LBS for my build. E-Bay $151 shipped.

I just noticed this post, the smallest lightweight flywheel available is a 12 3/4 that accepts a 10.4 clutch for early BB`s through 427`s that was actually the original high RPM high HP OEM L88 flywheel that can be used on most Chevy engines except those later internally ballanced engines. But GM also has a similar one for the externally balanced engines also.