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What fuel

What Fuel do we all run our old holden 6's on. I currently drive a vk it only ever gets 91 unleaded in it, the head on this 1 hasn't been done up for unleaded eventually If I ever rebuild the motor it will get done up for unleaded. I don't bother with any additives I don't drive that hard usually I'm asking this as I was surprised at some of the answers in another thread by blokes saying to use 98 why bother how much further in k's per tank does it go? My oldman did the same that motor went 10 years out lasted the car. Has anyone put any hard numbers to using expensive fuel in some thing that putts around in traffic and proved it goes more k's and saves money ? Who use's additives?

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my opinion is that 95 and 98 are much better quality fuels than std 91 octane. they contain detergents which keep your ports and valves clean on the intake side, compare 2 otherwise identical heads and its easy to see which was run on the good fuel and which wasnt.

as for economy, if the engine has the compression to need the extra octane, then TUNING TO TAKE ADVANTAGE of the better fuel will provide better economy, often more than offsetting the extra cost of the fuel. dont just put 98 in a car thats been running on 91 without issues and expect any better mileage without adjusting the timing.

as for any ethanol fuel, i dont run it, seen first hand the effects on carburettor rubbers on older cars (ie accelerator pump plungers)

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I use 98 without any additives for the reasons given by Ben.

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Cheers John My Shed

have both been converted to run ULP, and they are both happy with no-ethanol 91 or 98.

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If your project doesn't work, look for the part you didn't think was important.

One should forgive one's enemies, but not before they are hanged

mckackie

Today, filled up for 62.9c/l, before discounts. :-D
Getting about 18mpg from my tired Black 6.

It's a blend of propane and butane, with the legal minimum amount of propane allowed being 50%. Propane is apparently better than butane, but you can't tell what the mix is, as it fluctuates according to industry supplies.

For about 7 years I only used the E10 petrol (approx 10% ethanol with 90% 91 octane petrol), with no problem in either of my 120Y or Red 6 motors (unmodified) - but neither was an especially precious or long-term engine.

If I ever went back to petrol, I'd tune any older style motor I had to run on the 98 octane.
The 98 stuff has more detergents than the 95, from what I've read.

HK'ing.

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'i'm definately shore that guage wont work with my tuff bango diff and Opal sydcrome box,if it goes though my grill,and I put the breaks on I realize its better with the glimer belt & tunned holly and Ederbrock duel feul webber gaurds, wiht etc primmer.'

from what i have seen both 95 and 98 keep ports and valves equally clean. and from 2004 to 2006 i used to run caltex vortex 95 over bp ultimate 98 in my hq race engines after extensive dyno testing showed the caltex to make more power. only stopped as our race club mandated bp ultimate to simplify fuel testing.

if all your engine needs is 95, no real requirement to pay the extra 5cpl for 98 over 95 - IMO

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Thanks for that, Ben :-)

HK'ing.

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'i'm definately shore that guage wont work with my tuff bango diff and Opal sydcrome box,if it goes though my grill,and I put the breaks on I realize its better with the glimer belt & tunned holly and Ederbrock duel feul webber gaurds, wiht etc primmer.'

In cars made for non-ethanol fuels that the straight 91 octane mineral petrol and 98 premium give the best mileages. for some reason, the 94/5 being offered as an expensive alternative at evil empire servo's doesn't quite go as far. E-10 only works in cars designed for it, but interestingly, I have noticed it is now the same price as non-ethanol 91. While ethanol works as a fuel, the long term gains are minimal in most cars designed for mineral fuels, and there is less stored energy in it as well.
When I fill my Adventra up at sites offering both E10 or mineral 91, I still find my O2 sensors get a bit hot and throw up a trouble light. I am finding independent BP sites seem to have the best 91.

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If your project doesn't work, look for the part you didn't think was important.

One should forgive one's enemies, but not before they are hanged

mckackie

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