Internal vs External balancing

I know this should've been put in the engine section but there's more traffic here.

Tell me the pro's and con's. Are there limiting performance factors? Or "anything" that somebody should be aware of, of one balancing option over the other. I think I know the obvious but I want to make sure. Give me you're opinions and or thoughts.

Mike I have run both internal and external and could not tell a flippin thing different either way.......


Randy

If your rpm range is low to moderate the external balance will be fine. Those with HeRo engines will need to internal balance

Externally balancing an engine in the FRONT and and rear then using it consistantly in the high RPM ranges will tend to put excessive stress on the crank snout; mostly because it is simply hangin' out there in the wind.
Externally balancing the engine in the rear ONLY seems to have no detrimental effects at all, as long as the counterbalance factor is not more than 30 in/oz. More than that amount of counterweight will usually tend to show-up with abnormal wear in the #4 main bearing at very high RPM limits.

rmcomprandy wrote:Externally balancing an engine in the FRONT and and rear then using it consistantly in the high RPM ranges will tend to put excessive stress on the crank snout; mostly because it is simply hangin' out there in the wind.
Externally balancing the engine in the rear ONLY seems to have no detrimental effects at all, as long as the counterbalance factor is not more than 30 in/oz. More than that amount of counterweight will usually tend to show-up with abnormal wear in the #4 main bearing at very high RPM limits.

This is an engine I am doing for him, 528 inch SCJ aluminum heads , solid flat tappet , bowl ported, flat top pistons around 13:1 compression. 276-286 on a 110 sep . Probably shift around 6500.

It has the Ford 514 crate engine crank in it that Kieth Sherry ran. 2.5 inch rod pin, 4.30 stroke.
With the stock length 6.605 H beam rods and flat top pistons it will require six pieces of mallory 3 on each end 1 inch in dia.

Let me know if you want any more info.............

This is the deal i.m.o.
The FRPP crate 521" were external balance and seem to work fine. I suspect that the combo Blake post will be fine ext. bal. The combo that Randy posted about doing the rear only ext. deal darn sure will.
14/1 , $1,000 port job , 284* @ .050" dur. intake lobe on billet roller cam and shifted @ 7,200 rpm would be another thang. J.M.O.

Thanks Guys !!