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Author Topic:   question about flywheel/balance plate
R & R Racing
Dirt Newbie

Total posts: 4
posted August 18, 2005 09:06 PM  
I claimed an engine in the IMCA stock car class. It is a 383 with the new (one piece rear main seal) crankshaft. It came with a flex plate. I run a 3-speed.

The guy I claimed the engine from told me the flex plate is balanced to the engine. I'm guessing that means the engine is externally balanced.

I was able to get a stock flywheel for a 350 with a one piece flywheel from O'Reilly's. However, they weren't able to tell me if this flywheel is for an internally balanced engine or an externally balanced engine. Do I need to use the balance plate that Speedway makes between the flywheel and crankshaft, or will I be OK without it? I get more confused the more I check on this.

I don't know for sure, but I think the crankshaft may be a Scat crank.

Thanks for any help I can get with this.

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Ernie, #6 Factory Stock
#6 Stock Car
Beatrice Speedway

It's never too late to have a happy childhood

waltonjr1
Dirt Forum Champ
Total posts: 516
posted August 18, 2005 10:13 PM  
If the old flywheel had balance weights it is externally balanced therefore your new flywheel should have balance weights, if not you can use a balance plate. Hope this helps.


Eljojo
Dirt Forum Champ
Total posts: 968
posted August 19, 2005 04:37 AM  
Yup, look the flexplate over that came with the motor. You will see a couple of rectangular weights welded to it, close to the outer edge. If it as those, you will need an externally balanced flywheel.
I have a very nice 153 tooth flywheel that has been rebalanced to externally balance a 400 crankshaft. It uses a 9" clutch and pressure plate and the long throw-out bearing. I'd like to sell the whole set up. It's a nice unit, custom made. If you'd be interested (and can wait for a UPS delivery) pm me for my phone # and we'll deal.

R & R Racing
Dirt Newbie

Total posts: 4
posted August 19, 2005 06:12 AM  
So is the flywheel I got for a 1-pc rear main seal 350 crank externally balanced or not? I don't have an externally balanced flywheel to check it against, just a flex plate. I see that Jegs carries a Hayes flywheel for a 350 1-pc rear main seal crank that is externally balanced. However, this is a flywheel I got at O'Reilly's and they could not tell me if it is externally balanced or not. Thanks.

Eljojo, if that setup will work with my engine, I might be interested in it for next season.

[This message has been edited by R & R Racing (edited August 19, 2005).]

Eljojo
Dirt Forum Champ
Total posts: 968
posted August 19, 2005 07:48 PM  
No, it won't work with that crank-sorry, it's for the old style two piece seal cranks!

James Ott
Dirt Maniac

Total posts: 131
posted August 23, 2005 10:23 AM  
There is an add on weight kit to make a intrnally balanced flywheel into an externally balanced flywheel. these are around $25.00 bucks on ebay

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"Winning heals all wounds"

CLBaker25
Dirt Maniac

Total posts: 193
posted August 23, 2005 12:29 PM  
Hey Ernie,

Corey Baker here. I help Mike Sherwood. The crank should be a 400 crank if it is a 383. Does the engine have a counter balance plate on it? I am not sure if that is what they are called or not. You might talk to Mike about it. We run all 400's so he could probably help you. I don't know anything about engines so I can't help much with your question, but I think that Mike would know. You should just get a lite weigth clutch to go with that flex place.

If you need any help with anything setup wise PM me or post it on here.

sideways
Dirt Forum Champ
Total posts: 715
posted August 23, 2005 07:31 PM  
All one piece rear main seal engines are externally balanced.But as far as balanced for that engine probably not.The flexplate was probably spun with the crank and balancer.That is the way my last 383 came.

    

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