I was reading this page, and it made some interesting claims. Wondering if they're true.
http://www.groupk.com/tec-seizures.htm
Claims:
If you could freeze your engine "in motion" in the middle of a long full throttle pass, and disassemble it for micrometer measurement, you would find the piston to measure at a .0005" to .0015" press fit into the bore. That's right, a slight press fit!
Most experienced , and well meaning, motorcycle mechanics would take one look and immediately say that insufficient piston clearance is the cause. However that diagnosis, on watercraft engines, would be wrong about 99% of the time.
http://www.groupk.com/tec-seizures.htm
Claims:
If you could freeze your engine "in motion" in the middle of a long full throttle pass, and disassemble it for micrometer measurement, you would find the piston to measure at a .0005" to .0015" press fit into the bore. That's right, a slight press fit!
Most experienced , and well meaning, motorcycle mechanics would take one look and immediately say that insufficient piston clearance is the cause. However that diagnosis, on watercraft engines, would be wrong about 99% of the time.
Suprx125
New member
Yep, they can due to the cooler temps. of using lake/sea water.
I was under the impression most cold seizures happened on forged pistons with tighter piston to cylinder clearances (probably most snowmobile engines, but not most automobiles). But this guy says the piston is larger than the cylinder at WOT, which doesn't make sense to me.
mod-it
Member
It gets larger because the cylinder doesn't heat up as fast as the piston. So running hard when cold the piston expands with the heat faster than the cylinder does.
Or at least that's the way I've always understood it.
Or at least that's the way I've always understood it.
