Flying pumpkin #31
New member
Boring a animal block from .020 to .030 over with a world formula forged Piston what should I have for a stock forged piston for side clearance any info would be appreciated
That depends on how ragged edge you want to live, I guess.What is max before needing to go next size?
with excessive piston clearance, causing piston rock both at tdc and bdc, will you hear knocking sound because of the piston rock at the top?? had a similar question on another post without and answer.That depends on how ragged edge you want to live, I guess.
I've had small plate engines run just fine on .0045" clearance. Higher rpm would concern me with that much clearance on an animal piston though. When the piston rocks over TDC, you lose ring seal, to an extent, the more clearance that you run.
And square and straightness of bore!The smaller the clearance the more important precise measuring tools and the resulting measurements are.
High clearances reduce friction and enhance performance but reduce dependability. Kaboom, especially on the big end of the rod. On the piston I like around .0023- .0027. I know a local builder that prefers .002 and if you can bore and hone that well, it is probably preferred.We never run less than .003
Steve
thats where this animal i have is but i dont see any swedging on this pistonWe used to go up to .010 and swedge the piston skirt on flatheads. Don’t know how the would work on an Animal.
You'll see a lot more than "swedging" if you continue to run it with .010!"thats where this animal i have is but i dont see any swedging on this piston
Plan to order an oversize world formula piston it wont be going back together like that lolYou'll see a lot more than "swedging" if you continue to run it with .010!"
That short rod and bad rod angle will load the piston skirt enough to swedge itself...right out onto the front stretch.