u.l.p. or not

[davo]

Will a g1800 motor run on ulp or super or will it burn the valves out. Has anybody tryed it. Any help

[GasGem]

search button........yes.

[phillbie]

yeah man any of the g series motors will run on unleaded, i run my stock 1600 on unleaded. cause it has the alloy head, it all ready runs hardened valve seats. and even in the workshop manual it tells u the car is designed for a fuel with octane rating of 89 and unleaded if i remmber correctly is about 94, dont quote me on that one tho.

[Benjamin]

I run PULP. Out of emergency I had to run LRP, she was not happy until I retarded the dizzy a bit. Now I have PULP again with better result

[CuGem]

yeah the G series is OK for ULP because of the hardened valve seats. But don't judge the suitability of an engine for unleaded on the octane rating the engine can run. The octane rating may be fine, but you'll eventually wreck the valve seats if the engine was only designed to run on leaded (Super and Standard as us older farts called them). Octanes got nothing to do with it past being high enough not to detonate.

[Gold TX Sleeper]

The rating varies from servo to servo, I wouldn't be surprised if one has unleaded with a 94 R.O.N rating. The servo i work at has the following ratings - Super/LRP = 96 R.O.N, Unleaded = 91 R.O.N, Premium = 95 R.O.N. Optimax from a Shell servo should have a 98 R.O.N rating.
Just as a bit of advice, in 3 seperate tests with various commercial octane boosters (up to 10 being tested in a session), the winner was always the same. Nulon Pro Strength Octane Boost. It's one of the more expensive though (a bit of a 'you get what you paid for' deal), at about $18-$20 a bottle. It raised the R.O.N rating 5-6 points every time. Where as some of the others only raised the bar 0.5 - 0.8 R.O.N.