Internal balance flywheel
 

Is it imperative that an SFI approved flywheel be used on a BBC marine application? Also looking for a good source on a 1 piece internally balanced flywheel for a BBC. Thx!

http://m.summitracing.com/parts/ram-1501

Here's the one I plan on using. Made in the USA and very reasonable.

I think the SFI rating is great peace of mind on the flywheel.

No. Summit, Jeg's, CP

I have two new SFI rated internal balance flywheels that I had balance checked to zero, installed for Dyno testing only, both are epoxy primed and painted black. Will sell for far less than anything on the market.
These are Summit steel billet, SUM-700180. Paid $209.00 plus my additional balancing fees.
Will sell for 100.00 each plus shipping.

These are the larger of the two Chevy sizes as counted by flywheel teeth, 168 teeth. I switched to the smaller units only because I already had starter motors for the other size.

Pay pal, [email protected] please add 3% PP fee.

Or call 603.228.2888 and pay by credit card.

Mario L.

Borgie, the GM V/VI Flywheel is pretty cheap at $125.00 http://www.gmperformancemotor.com/parts/14096987.html
But it is external balance. Not to hard for someone to internal balance, but say it costs $75.00 (just making that up as 1hr labor for some shops) then you are at $200.00.

borgie,this is a great deal,sfi for less than standard price,pull the trigger and dont look back.mario l has been an oso member since 08 so imo this would be a very low risk deal.

Even lower risk, it looks like he boats on my lake about 20 min away. If he doesn't deliver I could run down the street and poke him in the eyes. LOL.

SB i like the way you think!

Thanks for the help fellas! Mario is the man and delivered on this mint billet flywheel that's now sitting in my kitchen lol. Thanks again!

Ahhh, the power of OSO! ;) Make sure you leave the man good feedback.

does it have to be SFI approved and internally balanced to use it as a cutting board on the kitchen table?

Uh yeeeeah!

Turns out this is a 2 piece unit, and I needed a 1 piece. Anyone know of a relatively inexpensive neutral balance flywheel for a 1 piece main?

Check with your machine shop on how much to neutral balance a Factory 1 piece seal flywheel.

On this style flywheel, you'd remove metal (drilling) vs adding weight.

Worth a call.

Yeah I thought about that but wondered if a SFI style was available. Seem to be few and far between. Makes sense though. Probably going to call my machinist tomorrow. Thx!

Figure after machining this might be a better deal. And it's SFI billet, with removable weight.

http://m.ebay.com/itm?itemId=111115747934

I've done some checking and spoke with my machine shop that builds short track and super modified SBC and BBC Chevy engines . . For a zero balance or internally balanced engine BBC or SBC 2 pc rear main, this flywheel should fit and be correct.
They checked alignment, BC diameter and alignment pin location all match up when this flywheel is used on a BBC INTERNALLY balanced set up.

Beau, I'll also refund your monies if you feel uncomfortable about going forward

Mario L.

borgie,i responded to your pm.im pretty sure the wheel you got from mario is correct for your neutral balanced engine.

Mario,

First, you have been awesome helping me with this.

Mike T, Thank you!!


From several sources it seems like the 1 piece flywheel center hole is smaller in diameter than the 2 piece. The bolt pattern is the same SB/BB chevy, but the center hole is different, so people don't swap them accidentally is what I'm understanding. If this is not the case please list the correct info for others.

This would be the correct flywheel. Just need to unbolt the counter weight for my internal balance callies crank.

https://www.rebelperformance.com/tra...t-ext-bal.html

Borg, have you tried to see if it will physically bolt up to your crank? I would think that if it bolts up, and is internally balanced, has the right diameter and number of teeth, then it should work.

I would do that, but I sold my old crankshaft and my callies crank is on back order (2weeks), so cant verify beyond asking guys who have been there done it. Actually just spoke to Alex Haxby and Mark Rinda, and they both said it's the correct flywheel for my application. Thanks again guys!

bolt patterns are the same gen 4 5 6 ,if the motor is internally balanced you need a neutral wheel

Yeah I realized that, however I had heard the center hole of the flywheel could vary in size. Glad this flywheel will work! Too many projects and parts orders right now, so getting confirmation this would work was a relief. Try working on two boats with a 3 year old! Lol. Good times. But I wouldn't trade it for the world. Thanks again!

Beau, Called me and ask for an explanation of the flywheels. Yes; the bolt patterns are the same. A neutral balanced flywheel for a internally balanced application as Beau is doing is right on track. He could of used his stock flywheel, machined the counter-weights out and neutral balanced it, as he told me what he paid for the billet flywheel it was a NO BRAINER.
If you are using a externally balanced application, the flywheels will make a difference. The early 2 piece style crank has a flange with enough weight that takes away from the the flywheel counter-weight for the Mark IV. The GEN 5 & 6; 1 piece cranks have no counter-weighted flange, so the flywheel has more counter-weight. You do not want to just switch flywheels that are for externally balanced applications, without insuring of the proper application. I always use the appropriate flywheel and balancer for each rotating assy being balanced. If you are using a Fluid Damper that is externally counter-weighted, I always remove the ring and balance with the hub only.