I was told by someone I consider an authority on FE's that FE's wound up with a "harmonics situation", i.e., a vibration. All of them.
The only way he knew to reduce it is to use a heavier balancer. What you are doing by adding reciprocating mass is not re balancing the engine but moving the vibration to another rpm range or some would describe it as "dampening" it in the usable rpm range of the engine.
I believe that essentially was said by Scott, not in the exact wording but in describing the effect?
I have seen this effect on other Ford engines as well. You can more then notice the added mass on the 289hp, Boss 302, the Boss351c and the 427's.
One thing that I noticed was on my 351c. When I added the '72 351HO balancer v. the 4v balancer, it seemed to calm the idle down as if I had taken some of the duration out of the camshaft timing.
I think that you can actually use the 427MR balancer in your application also. The 427's are neutral balance through the complete engine. I think the 390's are also but it depends on which crankshaft you used if you built a stroker using Ford parts?
The 428's are neutral balanced in the front half and Detroit balanced in the rear half. I don't know how that works but it means that any FE balancer will work on any FE since they are all neutral balanced on the nose. The flywheel is a different story and needs to match the Ford crankshaft used.
Aftermarket, non-Ford crankshaft manufacturers will advise you what to use with theirs.
I would go with the heaviest balancer that I could get in there, like the "427" on my '67 GT500 428. It can't hurt the engine. Cobra Automotive has those also.
The only way he knew to reduce it is to use a heavier balancer. What you are doing by adding reciprocating mass is not re balancing the engine but moving the vibration to another rpm range or some would describe it as "dampening" it in the usable rpm range of the engine.
I believe that essentially was said by Scott, not in the exact wording but in describing the effect?
I have seen this effect on other Ford engines as well. You can more then notice the added mass on the 289hp, Boss 302, the Boss351c and the 427's.
One thing that I noticed was on my 351c. When I added the '72 351HO balancer v. the 4v balancer, it seemed to calm the idle down as if I had taken some of the duration out of the camshaft timing.
I think that you can actually use the 427MR balancer in your application also. The 427's are neutral balance through the complete engine. I think the 390's are also but it depends on which crankshaft you used if you built a stroker using Ford parts?
The 428's are neutral balanced in the front half and Detroit balanced in the rear half. I don't know how that works but it means that any FE balancer will work on any FE since they are all neutral balanced on the nose. The flywheel is a different story and needs to match the Ford crankshaft used.
Aftermarket, non-Ford crankshaft manufacturers will advise you what to use with theirs.
I would go with the heaviest balancer that I could get in there, like the "427" on my '67 GT500 428. It can't hurt the engine. Cobra Automotive has those also.