Thread: 87 Octane OK?
View Single Post
  #10  
Old 10-04-2023, 09:21 PM
Schurkey Schurkey is offline
Ultimate Warrior
 
Join Date: Aug 2002
Location: The Seasonally Frozen Wastelands
Posts: 5,933
Default

Quote:
Originally Posted by Tim Corcoran View Post
Compression test I get 105 to 110 (cold) in all cylinders which I thought was quite low.
So low, I'd suspect your compression tester is inaccurate.

Did you have the throttle jammed part-way open (or all-the-way open)? I find that "fast idle" is far enough open to give decent compression test results.

Quote:
Originally Posted by Tim Corcoran View Post
My question is do you think I can safely run 87 octane pump gas.
If your cranking compression is accurate, probably. Start higher, work your way down. Listen for detonation, and if you hear it, go back up a grade.

The Following User Says Thank You to Schurkey For This Useful Post: