Gas Additives
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
listen to john Z and I can attest to what he says as I used 91 shell in my 435 and LT-1 with no ill effects or detonation. if you want to talk 435's pm me and I will give you a call next time I am in dallas and we can meet somewhere. for gas just get some racing fuel to add to your local stuff and you can sleep well at night.
Something's wrong with your picture here isn't it?
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
Here is what the OP said he is trying to accomplish with the additives:
"trying to avoid engine knock and burning up valve guides because the engine is original and supposed to have leaded gas and higher octane than I can buy".
Since many owners have no problem running their stock spec 435 on commonly available pump gas, it would seem to me the appropriate action would be to find out what was wrong with the the OP's engine rather than just "add racing gas" (or additives) and put up with the expense and inconvenience don't you think?
Or do you think maybe the OP just bought this car, isn't sure whether he has a problem or not and is just reacting to something he heard about 435's on the internet?
Maybe it's the latter but it's not really clear.
Last edited by MikeM; Jan 6, 2010 at 07:37 AM.
Safety Car
Joined: May 2003
Posts: 4,797
Likes: 239
From: Ocean Township NJ
Mr. Morgan wanted to hear someone tell him to add race fuel. After that "solution" was suggested, Mr. Morgan has buttoned up.
It is fairly well established that SHP BBC are much closer to the "ragged edge" of detonation as originally "out of the box" than SHP SBC. It doesn't take a whole helluva lot to induce detonation in a stock L71/L72/L78 running on 93 PON.
That is the reason why I asked the OP "how badly does it detonate" in post #24. I was trying to have the OP adopt the possibility of "tweaking" the engine, or perhaps addressing what probably amount to a myriad of minor remedies before resorting to fuel additives, etc. A simple cleaning of carbon deposits from the chambers, colder plugs, bigger primary jets, retarded timing, etc etc might be enough to resolve the issue.
It is fairly well established that SHP BBC are much closer to the "ragged edge" of detonation as originally "out of the box" than SHP SBC. It doesn't take a whole helluva lot to induce detonation in a stock L71/L72/L78 running on 93 PON.
That is the reason why I asked the OP "how badly does it detonate" in post #24. I was trying to have the OP adopt the possibility of "tweaking" the engine, or perhaps addressing what probably amount to a myriad of minor remedies before resorting to fuel additives, etc. A simple cleaning of carbon deposits from the chambers, colder plugs, bigger primary jets, retarded timing, etc etc might be enough to resolve the issue.
Last edited by 65tripleblack; Jan 6, 2010 at 09:32 AM.
Race Director
Joined: Apr 2005
Posts: 11,280
Likes: 2,145
From: Bowling Green, Kentucky
How is your gas octane measured?? Research, Motor, or the average of the two (R+M)/2....also known as PON or Pump Octane Number.
Some areas outside the USA use different measurements, which can confuse comparisons. I know Australia and Europe use a different standard. Not certain about your part of Canada.
Larry
Le Mans Master
Joined: Nov 2008
Posts: 5,691
Likes: 12
From: columbus oh
Race Director
Joined: Jul 2001
Posts: 15,892
Likes: 42
Bob:
How is your gas octane measured?? Research, Motor, or the average of the two (R+M)/2....also known as PON or Pump Octane Number.
Some areas outside the USA use different measurements, which can confuse comparisons. I know Australia and Europe use a different standard. Not certain about your part of Canada.
Larry
How is your gas octane measured?? Research, Motor, or the average of the two (R+M)/2....also known as PON or Pump Octane Number.
Some areas outside the USA use different measurements, which can confuse comparisons. I know Australia and Europe use a different standard. Not certain about your part of Canada.
Larry
Actually, yes I do know why. There's a long line up of kids with f*rt pipe equipped rice rockets just waiting to try it out. Word on the street is that high octane adds lots of HP.
History repeats itself.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Every 2027 Corvette Engine Explained
Joe Kucinski
Designer Imagines A Corvette That Looks More Like a Corvette Than the Corvette
Verdad Gallardo
10 Ugly Corvettes That We Still Kinda Love
Joe Kucinski
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Team Owner
Joined: Mar 2003
Posts: 26,118
Likes: 1,874
From: Greenville, Indiana
Mr. Morgan wanted to hear someone tell him to add race fuel. After that "solution" was suggested, Mr. Morgan has buttoned up.
It is fairly well established that SHP BBC are much closer to the "ragged edge" of detonation as originally "out of the box" than SHP SBC. It doesn't take a whole helluva lot to induce detonation in a stock L71/L72/L78 running on 93 PON.
That is the reason why I asked the OP "how badly does it detonate" in post #24. I was trying to have the OP adopt the possibility of "tweaking" the engine, or perhaps addressing what probably amount to a myriad of minor remedies before resorting to fuel additives, etc. A simple cleaning of carbon deposits from the chambers, colder plugs, bigger primary jets, retarded timing, etc etc might be enough to resolve the issue.
It is fairly well established that SHP BBC are much closer to the "ragged edge" of detonation as originally "out of the box" than SHP SBC. It doesn't take a whole helluva lot to induce detonation in a stock L71/L72/L78 running on 93 PON.
That is the reason why I asked the OP "how badly does it detonate" in post #24. I was trying to have the OP adopt the possibility of "tweaking" the engine, or perhaps addressing what probably amount to a myriad of minor remedies before resorting to fuel additives, etc. A simple cleaning of carbon deposits from the chambers, colder plugs, bigger primary jets, retarded timing, etc etc might be enough to resolve the issue.
I'd suggest you offered the right approach but since the OP has disappeared, I think it's safe to assume you are correct that he was looking for an answer he wanted to hear.
Your line of thinking was the same reason I asked what he was trying to "fix" in the second post in this thread.
I often wonder how many new Corvette owners of old Corvettes even know what "spark knock" even sounds like since there have been knock sensors installed on most electronically controlled engines for the last thirty years and lots of drivers have never even heard the sound.
Race Director
Joined: Jun 2006
Posts: 17,901
Likes: 751
From: Inverness FL
St. Jude Donor '07
I often wonder how many new Corvette owners of old Corvettes even know what "spark knock" even sounds like since there have been knock sensors installed on most electronically controlled engines for the last thirty years and lots of drivers have never even heard the sound.
Bill
Drifting
Joined: Dec 2005
Posts: 1,973
Likes: 5
From: Valrico Florida
Sorry guys. I must have misunderstood his question. It is true that he expanded it with subsequent posts so I stand corrected.
