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It's of little or no value here so as I've said to you before we can do without it as you're continual reference to methanol is just annoying people.
Where' the power?
- Thread starter MLW
- Start date
It's of little or no value here so as I've said to you before we can do without it as you're continual reference to methanol is just annoying people.
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You think wrong, although trying to change your mind is a futile endeavour..
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Unless I’ve gone out of date (again), the common higher octane fuels are slower burning than the cheap stuff, but that is not the same thing as their anti-knock properties.
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Agreed, but sometimes you have to compromise a bit to save having to replace kick start components at an accelerated rate.
Here's what AI (not Al) has to say: "No, octane rating and flame speed are largely unrelated properties of fuel, as octane measures knock resistance while flame speed is determined by the fuel's chemical composition and operating conditions, not its octane level. High-octane fuels are more resistant to pre-ignition, but this property does not mean they burn faster or slower; some high-octane fuels burn quickly, while others burn slowly. Using higher octane fuel than necessary for an engine can actually reduce performance and slow the burn rate."
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Schwany
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Damn it for got to reply to someone else off topic. This is not meant for the OP
Al is an interesting off topic generator.
So how does one determine what the right amount of octane is for a given engine? I've never put race gas in any motorcycle and had it not increase performance. Plus it's pretty to look at color wise and smells better than pump gas. Just trying to keep things off topic like a good VIP member is want to do.
Al is an interesting off topic generator.
So how does one determine what the right amount of octane is for a given engine? I've never put race gas in any motorcycle and had it not increase performance. Plus it's pretty to look at color wise and smells better than pump gas. Just trying to keep things off topic like a good VIP member is want to do.
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"Wont."Damn it for got to reply to someone else off topic. This is not meant for the OP
Al is an interesting off topic generator.
So how does one determine what the right amount of octane is for a given engine? I've never put race gas in any motorcycle and had it not increase performance. Plus it's pretty to look at color wise and smells better than pump gas. Just trying to keep things off topic like a good VIP member is want to do.
ashman
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Well when I have used low octane fuel (91 octane Aus fuel rating) in my Norton my motor pings badly and the performance is down, 95 octane is better the pinging is gone and the motor runs better but I run 98 octane and my motor performs the best with the higher premium fuel and the same thing with my 1200 Thruxton runs best on the higher premium fuels, but my Norton use to run pretty good with the old super leaded fuels and it didn't go off like our unleaded stuff, it had a nice red colour to it and smelled like petrol, ahhh the good old days.
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too often, off topic.
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ashman
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Never had any problems doing it this way with my old Boyer EI and 2 time I had to run home on one cylinder from a dropped coil to a lose carbie manifold, was night and couldn't see the lose manifold, with the dropped coil the top of the coil was still sitting in the tool tray where I had my coils mounted with the other coil but under the top under the tray was nothing completely gone, both times easy fixed as soon as I got home, had a spare coil and the manifold just needed to be tighten up.
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Back on topic.
When you get your new Main jets received. Not all airports will sell to you with out wings. Smaller airports may be more successful at purchasing. Try purchasing some 100LL av gas and try doing Full throttle plug chops going up a slight hill to sort your main jets. Once the colour is right then narrow your tuning with regular car fuel when its close.
When you get your new Main jets received. Not all airports will sell to you with out wings. Smaller airports may be more successful at purchasing. Try purchasing some 100LL av gas and try doing Full throttle plug chops going up a slight hill to sort your main jets. Once the colour is right then narrow your tuning with regular car fuel when its close.
Schwany
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I ran race gas in the off road bikes mostly. I think it was 108 and probably had some other stuff in it. Sunoco and VP. Shared 50 gallon drums of it with a guy I used to ride with. It was in the 80's and 90's. The race gas always made a positive difference or I would not have used it.
ashman
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We use to have a local BP service station that the owner was into speedway and race cars so he sold all the racing fuels, methanol and all but you needed a race licence to buy off him, he had one pump at the side of his garage that was 98 octane same as our premium fuel but it was refined more for racing, but at $15 a ltr at the time was a bit high, he also sold real racing Pennzoil but he would only sell it to the licence racers, he was a bit of a shonky operator and even his normal fuel prices where a bit higher than most of the service stations around the area and he was caught out with his pumps giving less fuel than what the dials where reading, he was a crook.
MLW
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Well this thead has certainly taken on a life of it's own! The selection of main jets I ordered will arrive next week. I will follow Jim's suggestions and jump to 280 main jets which incidentally is also what is recommended in the Dunstall race manual. I will report on the results.
I will also comment on this, the symptoms are only apparent in 4th gear and somewhat in 3rd. Otherwise, it starts first kick, hot or cold every time, Idles consistenty and has not changed once set, (yes with Amals!). Throttle response from idle is instant with no hint of lag or hesitaion as is often typical of slide valve carbs without accelerator pumps. The motor revs up smoothly, quickly and freely up to and beyond 7000rpm, (if I would let it) with a noticable surge of acceleration as the tach swings past 5000 in both first and second gear. To be honest, it pulls harder in first and second gear than any classic Amal Brit bike has the right to!
I will also comment on this, the symptoms are only apparent in 4th gear and somewhat in 3rd. Otherwise, it starts first kick, hot or cold every time, Idles consistenty and has not changed once set, (yes with Amals!). Throttle response from idle is instant with no hint of lag or hesitaion as is often typical of slide valve carbs without accelerator pumps. The motor revs up smoothly, quickly and freely up to and beyond 7000rpm, (if I would let it) with a noticable surge of acceleration as the tach swings past 5000 in both first and second gear. To be honest, it pulls harder in first and second gear than any classic Amal Brit bike has the right to!
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Have to admit, the first time I saw that word used, I said "huh?" Most would think it's lacking an apostrophe. It's probably on its way to becoming archaic.How much octane is Won't?
You got in a correction. Well played.
