SBF Balance question.. Neautral... 28.. 50..

Maverick · 11-18-2020, 05:17 PM

I had a few Boss 302 cranks I ran for years, and then I broke a crank, caught it in time. But the metallurgy has changed, So I ran this Boss 302 crank for a long time came to rebuild with rods and pistons, and I opted for a new crank. The cranks wear out. I felt better with a new crank that was made for neutral balance, that one that had seen service since it was made

SSDiv6 · 11-18-2020, 08:29 PM

Go neutral balance and get the crankshaft from Molnar Technologies. Every time I use Eagle or Scat, it requires work to correct issues.

Dave Noll · 11-19-2020, 02:29 AM

I've got a 28oz cast crank 351c that goes to 7300. It's been together 7 years and didn't get twisted that high till I figured some things out. I had a local machine shop balance it and it feels smooth @ rpm. The external balance gives a tiche less iron flying around Inside the crankcase.

I've also got a recently acquired Molnar massaged crank for my good engine. That's going to be a while though, too many projects.

Gary Smith · 11-19-2020, 03:51 AM

Bret Velde could probably shed some light on the subject I believe he played with external balanced SBF a long time ago.

BRETV · 11-19-2020, 10:37 AM

Brad, we did pick quite a bit going from 50oz to 28oz, but we also changed some other things to, so not sure how much was just the change in the weight.

Bret Velde
2003 ??/SA

11-18-2020, 05:17 PM	#1
Maverick Member Join Date: Dec 2010 Posts: 299 Likes: 3 Liked 36 Times in 26 Posts	Re: SBF Balance question.. Neautral... 28.. 50.. I had a few Boss 302 cranks I ran for years, and then I broke a crank, caught it in time. But the metallurgy has changed, So I ran this Boss 302 crank for a long time came to rebuild with rods and pistons, and I opted for a new crank. The cranks wear out. I felt better with a new crank that was made for neutral balance, that one that had seen service since it was made

11-18-2020, 08:29 PM	#2
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,045 Likes: 712 Liked 1,605 Times in 583 Posts	Re: SBF Balance question.. Neautral... 28.. 50.. Go neutral balance and get the crankshaft from Molnar Technologies. Every time I use Eagle or Scat, it requires work to correct issues.

11-19-2020, 02:29 AM	#3
Dave Noll Senior Member Join Date: Nov 2007 Location: Div. 6, Eastern, WA Posts: 710 Likes: 2,685 Liked 240 Times in 112 Posts	Re: SBF Balance question.. Neautral... 28.. 50.. I've got a 28oz cast crank 351c that goes to 7300. It's been together 7 years and didn't get twisted that high till I figured some things out. I had a local machine shop balance it and it feels smooth @ rpm. The external balance gives a tiche less iron flying around Inside the crankcase. I've also got a recently acquired Molnar massaged crank for my good engine. That's going to be a while though, too many projects. __________________ Dave Noll, EF/S ,?/SA 6526

11-19-2020, 03:51 AM	#4
Gary Smith Senior Member Join Date: Jul 2007 Location: Greensboro, NC Posts: 820 Likes: 9 Liked 132 Times in 30 Posts	Re: SBF Balance question.. Neautral... 28.. 50.. Bret Velde could probably shed some light on the subject I believe he played with external balanced SBF a long time ago. __________________ Gary Smith "another broke racer spectating"

11-19-2020, 10:37 AM	#5
BRETV Senior Member Join Date: Oct 2003 Posts: 568 Likes: 4,216 Liked 776 Times in 199 Posts	Re: SBF Balance question.. Neautral... 28.. 50.. Brad, we did pick quite a bit going from 50oz to 28oz, but we also changed some other things to, so not sure how much was just the change in the weight. Bret Velde 2003 ??/SA