White Mountain Saws
Well-Known OPE Member
- Local time
- 3:58 PM
- User ID
- 22914
- Joined
- Mar 17, 2022
- Messages
- 35
- Reaction score
- 75
- Location
- New Hampshire
I have a ported well known vendors 372 big bore which ran with out a hiccup for roughly ten years. Then a piston ring locating pin failed and took out the piston. I bought an entire big bore kit from the same vendor and noticed the cylinder and piston were different than previous generations from that vendor.
I mismatched the piston into the 10 year old cylinder. With 160PSI compression the piston lasted maybe 5 tanks of fuel before the small end (wrist pin) holes began ovaling. Fuel was 87 octane with name brand oil. RPM was set at 13,800
I have another aftermarket piston in the cylinder as I type. I’m done with aftermarket if this piston fails as well.
Does any one have theories as to why the piston began failing; Beyond metal quality?
I mismatched the piston into the 10 year old cylinder. With 160PSI compression the piston lasted maybe 5 tanks of fuel before the small end (wrist pin) holes began ovaling. Fuel was 87 octane with name brand oil. RPM was set at 13,800
I have another aftermarket piston in the cylinder as I type. I’m done with aftermarket if this piston fails as well.
Does any one have theories as to why the piston began failing; Beyond metal quality?