Wondering how many people are balancing their crankshaft/piston combinations here. I've had to pull the head on my modded motor & am thinking it would benefit from a balance. I've never done this, but am interested in how much it would help. Right now it shakes pretty badly at 3800-4000 rpm, then it smooths out at higher r's.
The basic build is 60363, Arc flywheel & rod, Bullfrog 11:1 domed hemi piston, Black Mamba cam, chromoly pushrods, VM22-133, 26# springs. The new head will be ported a bit when it gets here & I don't have weights on the rod-piston combination. Still a stock crank which has turned 8400 & still seems tight on the bottom. Cylinder is clean & everything is working well enough, except for the head.
I didn't Fit the bracket well enough on the header at the head & the combination of forces due to the slight misalignment & vibration tore a chunk out of the head this weekend. Re-did the header bracket to pick up the lower head screw, so hopefully this will be better. Here's what the old head looks like now with the bolt hole "missing" under the valve cover.
What's going on with people doing a balanced crank on these motors? The Bullfrog piston must be heavier than a stock one, but I'm trying to decide if I should tear down the whole motor & start from scratch again or just put the new head back on once it's ported & call it good.
What if I need extra weight in the crank, tungsten plugs & welding? Shave the bottom of the piston inside a bit?
Thanks in advance for helping me open the newest can of worms in my journey into speed.
The basic build is 60363, Arc flywheel & rod, Bullfrog 11:1 domed hemi piston, Black Mamba cam, chromoly pushrods, VM22-133, 26# springs. The new head will be ported a bit when it gets here & I don't have weights on the rod-piston combination. Still a stock crank which has turned 8400 & still seems tight on the bottom. Cylinder is clean & everything is working well enough, except for the head.
I didn't Fit the bracket well enough on the header at the head & the combination of forces due to the slight misalignment & vibration tore a chunk out of the head this weekend. Re-did the header bracket to pick up the lower head screw, so hopefully this will be better. Here's what the old head looks like now with the bolt hole "missing" under the valve cover.
What's going on with people doing a balanced crank on these motors? The Bullfrog piston must be heavier than a stock one, but I'm trying to decide if I should tear down the whole motor & start from scratch again or just put the new head back on once it's ported & call it good.
What if I need extra weight in the crank, tungsten plugs & welding? Shave the bottom of the piston inside a bit?
Thanks in advance for helping me open the newest can of worms in my journey into speed.