Originally posted by Roz 1999 SVT-C:
Using full on race fuel, in a street car, yes, i can see it damageing the engine, but i thought we were refering to Higher octain pump fuel.....I know the 76 station by my house sell 100 Octain Street Race fuel as Unleaded....In my old car it ran great, when I tore down the engine to replace the pistons and rings, with forged, (becasue of nitrous and turbo) the combustion chamber was still pristine! I replaced all seals as well in the tear down...none showed any signs of ware.....But thats what i thought by higher octain you were refering to.


Roz



Yeah, Roz, about 14 years ago, I also flirted with non-racing 100 octane in the slighly beefed-up, cast-iron block and head engine in my '85 XR4Ti (studs on the block, forged pistons, bored-out 20mm, conservative high-lift Motorsport camshaft, in-dash wastegate bypass for the Garrett TO3 blower).

It definitely gave the powerplant a kick in the pants and did no damage -- the engine and blower were in perfect shape when I traded the XR4 for my CSVT in '99 (I've been a die-hard Amsoil user for 15 years). But the $5/gal 100 octane available at that time from Superfuels was WAY too high-dollar for my wallet ...

And -- for the sake of getting back on the track the actual thread -- NO WAY would I go any higher than 94 octane in the unmodded engine of my '98 EO CSVT.

Did I mention Superfuels had a very brief lifespan?