geodoc
Cruisin' Guzzisti
- Joined
- Oct 27, 2008
- Messages
- 205
OK, this is not from a Guzzi, but I'm perplexed.
This is a cylinder liner from a Triumph T150 Trident used for vintage racing. After an oil pressure loss caused by stripped drive gears at Ridge Motorsports Park this past weekend, this was found on the center cylinder. The other two cylinders looked fine. The rod big-ends & bearings were torched, crank cracked at one of the big end journals ..................... and this found on the center cylinder.
The pistons looked OK - no stick rings or evidence of blow-by.
It was raced a few weekends before with an incorrectly calibrated tach that had it probably reving to over 10,000 RPM - 1000 past it's normal red-line.
So what would cause wear like this? Ring flutter during over-reving?
Stumped ..........................
George
This is a cylinder liner from a Triumph T150 Trident used for vintage racing. After an oil pressure loss caused by stripped drive gears at Ridge Motorsports Park this past weekend, this was found on the center cylinder. The other two cylinders looked fine. The rod big-ends & bearings were torched, crank cracked at one of the big end journals ..................... and this found on the center cylinder.
The pistons looked OK - no stick rings or evidence of blow-by.
It was raced a few weekends before with an incorrectly calibrated tach that had it probably reving to over 10,000 RPM - 1000 past it's normal red-line.
So what would cause wear like this? Ring flutter during over-reving?
Stumped ..........................
George