Wiseco Flattops Help

HBCwatercraft

HBCwatercraft

Location
HOLLAND MA.
Dont know for sure but i was informed that wiseco is out of stock for 2 months...Ill call mon to find out for sure.I need 85 mm for my lam,were else can i seek these out?
 
crammit442

crammit442

makin' legs
Location
here
24-7 760 superjet said:
Dont know for sure but i was informed that wiseco is out of stock for 2 months...Ill call mon to find out for sure.I need 85 mm for my lam,were else can i seek these out?
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Where are the pistons that were used to bore the cylinders? I'm sure paul used a new set of pistons to decide exactly what size to bore the motor. You can't really bore the cylinders accurately w/o having the pistons to measure. Or is the cylinder not yet bored? If it's not bored yet, I'd personally start at 84mm(if you can get them). You'll never feel the difference in 84 and 85 and will have 2 more bores before re-sleeving. Randy(Watcon) may have a set of them in stock. You get your crank yet?
 
HBCwatercraft

HBCwatercraft

Location
HOLLAND MA.
Any,didnt know there were that many options.Crank will be here mon-tue.As far as paul haveing them he doesnt...so it was bored from dasa.Ill be double checking the clearances during asembly.Can i get a second oppinion on piston to wall clearence,and ring gap.Its a 85mm bore and can go 86.5 safely.Its a 8mm billit crank freestyle setup.
 
crammit442

crammit442

makin' legs
Location
here
#.0 said:
Use the Riva flat top pistons part number RY1000-61X-85 and set them up at .005" ~ .006" clearance with .022" ~ .025" ring end gap.
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I'd agree with the .0055 clearance, but how did you derive the .022-.025 end gap? Wiseco recommends .004 per inch of bore which is only .013ish. I've never had any issues running them in that range.
 
GIL

GIL

Power In The Hands Of Few
Location
Cullman AL
crammit442 said:
I'd agree with the .0055 clearance, but how did you derive the .022-.025 end gap? Wiseco recommends .004 per inch of bore which is only .013ish. I've never had any issues running them in that range.
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True-but-you also run those inferior Blackjack carbs and MS109 fuel.:buttkick:
 
#ZERO

#ZERO

Beach Bum
Location
Florida - U.S.A.
crammit442 said:
I'd agree with the .0055 clearance, but how did you derive the .022-.025 end gap? Wiseco recommends .004 per inch of bore which is only .013ish. I've never had any issues running them in that range.
Click to expand...

The Wiseco's recommended .004" piston clearance is too tight for highly modified engines.

Most engine builders will add some clearence for added heat from more compression, porting, race pipes, more timing, etc.

The next time you bore your cylinder to .0055" piston clearance, check your new ring end gap.
 
crammit442

crammit442

makin' legs
Location
here
#.0 said:
Wiseco's recommended .004" piston clearance is too tight for highly modified engines.
The next time you bore your cylinder to .0055" piston clearance, check your new ring end gap.
Click to expand...

I always do. It's usually in the neighborhood of .014-.017.
 
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