Quote:
Originally Posted by GH85Carrera
When my original 305 engine in the El Camino was approaching 300,000 miles it had enough carbon buildup in the heads and on top of the piston to raise the compression ratio enough I would get spark knock with the regular. If I used the mid range it did not knock at all. When I swapped out the engine the new engine is happy with regular. That is the biggest reason I decided it was time for a new engine. Every 300K I will swap in another $1,700 engine.
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Replace "El Camino" with "1987 Toyota 4Runner" and my story is exactly the same. Carbon build up on the pistons raised the compression just enough to ping on 87, so I used 89. Problem solved.
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Mike
1976 Euro 911
3.2 w/10.3 compression & SSIs
22/29 torsions, 22/22 adjustable sways, Carrera brakes
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