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Author Topic:   100 octane
the last dive
Gearhead

Posts: 147
From: sydney australia
Registered: Dec 2001

posted 08-26-2002 07:58 AM     Click Here to See the Profile for the last dive     Edit/Delete Message   Reply w/Quote
if i run 100 octane fuel in my 10.1 engine will it make much difference to performance?

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steve'66
Gearhead

Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000

posted 08-26-2002 10:50 AM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
It won't make much difference. Run just enough octane to prevent detonation.

SteveW

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V8 Thumper
Gearhead

Posts: 2991
From: Orange, Ca. United States of America
Registered: Dec 2001

posted 08-26-2002 08:47 PM     Click Here to See the Profile for V8 Thumper   Click Here to Email V8 Thumper     Edit/Delete Message   Reply w/Quote
I'm running 91 in my 333, with a true (mathematical) c/r of 10.06:1. Not a single ping or knock

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steve'66
Gearhead

Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000

posted 08-26-2002 09:00 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
How's your octane rated down under?

Our's is the average between Research and Motor octanes.

SteveW

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the last dive
Gearhead

Posts: 147
From: sydney australia
Registered: Dec 2001

posted 08-27-2002 04:22 AM     Click Here to See the Profile for the last dive     Edit/Delete Message   Reply w/Quote
i emailed two petrol companies in sydney (bp,shell)and i asked them what sort of comp ratio their 98 octane fuel would support,there respones were 9.5 to 10.1 maximum,so im at my limit for pump fuel,i would hate to see what what comp ratio our 91 octane fuel could cope with.

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Clevo377
Gearhead

Posts: 303
From: Blackburn, Victoria, Australia
Registered: Nov 2000

posted 08-27-2002 06:52 AM     Click Here to See the Profile for Clevo377   Click Here to Email Clevo377     Edit/Delete Message   Reply w/Quote
I'm running on av-gas. Tried the Mobil 98 and had pinging. Comp is 11.8:1. Steer clear of the Shell Optimax as they are supposidly having some problems with it. Our 98 is RON (if thats the higher) so I think it's about equivelant to 94 in the US. You should be fine with the 98. The promoted performance increase using the higher stuff comes from being able to advance the ignition without detonation. What I did was use a higher octane than I thought necessary, tuned the engine to what I wanted, then dropped octane until I had pinging.

Oh, then went back up until no pinging

Paul

[This message has been edited by Clevo377 (edited 08-27-2002).]

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