What Balance?????????

NotchJohnson · 11-27-2001, 11:15 AM

I am building a 331 and have the rotating assembly and block ready to go. Now I need to have everything balanced but I dont know whether to get a 28 or 50oz balancer. The company who makes the crank said it can be balanced to either 28 or 50. Which balancer and flexplate do I need. If someone could help me out that would be great. Thanks, John

andy669 · 11-27-2001, 12:36 PM

I think this shold be a question for your machine shop or engine builder. But why not internally balance it?
andy

NotchJohnson · 11-27-2001, 12:41 PM

No one ever suggested internal balancing to me. People have told me to go with the 50oz balance but I just wanted to see what the guys on here said about it. John

Phantom5oh · 11-27-2001, 01:09 PM

you'll need to talk to the machine shop or the balance shop... they can tell you what to buy, but you should also have it internally balanced because 7 ounces of unbalance inside the engine is 212lbs at 4000 rpms... so you don't want that kind of extra stress on it if you can avoid it... depending on the type of crank you have and where you live it can cost you anywhere from 300 to 900 for a good balance job... but it is well worth it!!! since you wont loose the power of the unbalance.... hope this helps...

steve

93cobra tt · 11-28-2001, 01:41 AM

You can have the whole assembly balanced to either 28oz or 50 oz. 81 and up 302's changed from a 28oz to 50 oz balance. Whichever you choose, you need to have the flywheel and harmonic balancer match your balance. So if you have the very common 50oz balancer, and flywheel lying around, then have the crank balanced to 50oz. Either can be used, so I guess it is a matter of preference, and $$.

andy669 · 11-28-2001, 09:32 AM

What crank are you using, Notch? Is it an aftermarket steel crank, or a stock crank thats been stroked? If its stock and has flange on the end for the 2 piece rear main, it is a 28.2 oz. If it is smooth on the end, (one piece rear main) it is a 50 oz. If you go 50 you will need the Motorsport flexplate. M-6375-E302 It is the special 50 oz 157 tooth designed for C4's on late model engines.
andy

NotchJohnson · 11-28-2001, 11:37 AM

I have an aftermarked crank and the company says it can be balanced to either 50 or 28oz. Is there any difference between the two? I am going to be using an aod tranny, what flexplate is used with that? Ive heard the fms balancer are pretty good, so maybe ill run 50oz.

PKRWUD · 11-28-2001, 12:50 PM

Of course there's a difference! The more external an engines balance is, the more load is placed on the #1 & #5 crank journals. It may or may not create a problem, but if you've got the choice, always go with less external weight when it comes to balancing an engine, ALWAYS!!

Take care,
-Chris

NotchJohnson · 11-28-2001, 03:41 PM

Ok thanks, I didnt know that. John

90'5.0 Conv · 11-28-2001, 04:39 PM

And the man (pekerwood) does it again! It's really nice to know we have people like you around. Knowledge is very deep! We appreciate being able to come here for knowledgeable answers. All we have to do is get on our CPU at home and we can find out almost anything!

Thanks
James

PKRWUD · 11-29-2001, 01:59 AM

James-

Thanks for the kind words!

Take care,
-Chris

11-27-2001, 12:36 PM	#2
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	I think this shold be a question for your machine shop or engine builder. But why not internally balance it? andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

11-27-2001, 12:41 PM	#3
NotchJohnson Registered Member Join Date: Oct 2001 Location: Florida Keys Posts: 593	No one ever suggested internal balancing to me. People have told me to go with the 50oz balance but I just wanted to see what the guys on here said about it. John __________________ 89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.

11-27-2001, 01:09 PM	#4
Phantom5oh Registered Member Join Date: Mar 2000 Location: Boston, MA Posts: 334	you'll need to talk to the machine shop or the balance shop... they can tell you what to buy, but you should also have it internally balanced because 7 ounces of unbalance inside the engine is 212lbs at 4000 rpms... so you don't want that kind of extra stress on it if you can avoid it... depending on the type of crank you have and where you live it can cost you anywhere from 300 to 900 for a good balance job... but it is well worth it!!! since you wont loose the power of the unbalance.... hope this helps... steve __________________ 95 GTS 03 DR 650SE Sgarzi's Machine Works

11-28-2001, 09:32 AM	#6
andy669 Registered Member Join Date: Jan 2001 Location: Moline Il Posts: 901	What crank are you using, Notch? Is it an aftermarket steel crank, or a stock crank thats been stroked? If its stock and has flange on the end for the 2 piece rear main, it is a 28.2 oz. If it is smooth on the end, (one piece rear main) it is a 50 oz. If you go 50 you will need the Motorsport flexplate. M-6375-E302 It is the special 50 oz 157 tooth designed for C4's on late model engines. andy __________________ 88 coupe 91 LX NMRA Pure Street 5120

11-28-2001, 11:37 AM	#7
NotchJohnson Registered Member Join Date: Oct 2001 Location: Florida Keys Posts: 593	I have an aftermarked crank and the company says it can be balanced to either 50 or 28oz. Is there any difference between the two? I am going to be using an aod tranny, what flexplate is used with that? Ive heard the fms balancer are pretty good, so maybe ill run 50oz. __________________ 89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.

11-27-2001, 11:15 AM	#1
NotchJohnson Registered Member Join Date: Oct 2001 Location: Florida Keys Posts: 593	What Balance????????? I am building a 331 and have the rotating assembly and block ready to go. Now I need to have everything balanced but I dont know whether to get a 28 or 50oz balancer. The company who makes the crank said it can be balanced to either 28 or 50. Which balancer and flexplate do I need. If someone could help me out that would be great. Thanks, John __________________ 89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.

11-28-2001, 01:41 AM	#5
93cobra tt Registered Member Join Date: Nov 2001 Location: CT Posts: 12	You can have the whole assembly balanced to either 28oz or 50 oz. 81 and up 302's changed from a 28oz to 50 oz balance. Whichever you choose, you need to have the flywheel and harmonic balancer match your balance. So if you have the very common 50oz balancer, and flywheel lying around, then have the crank balanced to 50oz. Either can be used, so I guess it is a matter of preference, and $$. __________________ Here, F-Body, Corvette, Grand National- I've got two suprises for you.

11-28-2001, 12:50 PM	#8
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Of course there's a difference! The more external an engines balance is, the more load is placed on the #1 & #5 crank journals. It may or may not create a problem, but if you've got the choice, always go with less external weight when it comes to balancing an engine, ALWAYS!! Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-28-2001, 03:41 PM	#9
NotchJohnson Registered Member Join Date: Oct 2001 Location: Florida Keys Posts: 593	Ok thanks, I didnt know that. John __________________ 89 notch-finally not stock!! ported gt40's, ported cobra intake, 65mm tb, 75mm maf, mac cai, lt's,prochamber, fms 1.6 rr, 125 shot.

11-28-2001, 04:39 PM	#10
90'5.0 Conv Long time member in and out Join Date: Jul 2001 Location: Albany, Ga Posts: 343	And the man (pekerwood) does it again! It's really nice to know we have people like you around. Knowledge is very deep! We appreciate being able to come here for knowledgeable answers. All we have to do is get on our CPU at home and we can find out almost anything! Thanks James __________________ 90' Mustang GT Convertible- C4 w/ manual body 4.10's soon to be 3.27's 2 Ch Flowmasters 1/8th ET 9.04

11-29-2001, 01:59 AM	#11
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	James- Thanks for the kind words! Take care, -Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

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