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I keep burning pistons with my modified engine

Tiny
LESLIEN
  • MEMBER
  • 1980 MINI COOPER S
  • 7,000 MILES
I have a classic Mini and has a 1275 engine modified to 1380 cc using 73.5 pistons. Compression ratio is around 13 : 1 I had gasket problems and now it has started to blow pistons. Earlier one piston was burnt and a friend told me it was running too advance and it was the reason to burn the piston. Then I replaced the piston and Retard the engine to have maximum advance of 35 at maximum RPM of 7500. Again another piston was burnt. I am using 100 octane petrol. What would be the reason to burn the piston. Also the car was not moving fast. I am using NGK Cooler (10) plugs. I have another similar car and it has no problems. The car does not heat up and the temperature is normal.
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Wednesday, April 11th, 2012 AT 3:18 AM

2 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Could be running too lean, too much oxy in the mixture can destroy metal.
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Wednesday, April 11th, 2012 AT 8:35 AM
Tiny
LESLIEN
  • MEMBER
  • 2 POSTS
I had changed jets and was running rich, the plugs were dark and was not running lean.
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Thursday, April 12th, 2012 AT 2:30 AM

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