1st Generation Specific (1979-1985) 1979-1985 Discussion including performance modifications and technical support sections

Oil metering and vacuum advance

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Old 07-07-04, 05:02 PM
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Oil metering and vacuum advance

After installing a Weber, I had to drill a hold in my new manifold for the brake booster. I was just wondering how necessary it is to connect the oil metering line and vacuum advance lines. Seems to run fine without them, but I thought I'd ask anyway.
Old 07-07-04, 05:16 PM
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Unless you premix connecting the oil metering line is pretty dam important. It helps lubricate the inside of your engine!

You can set your timing to not use the vacume advance. There is a tutorial around here someware about it.
Old 07-07-04, 05:25 PM
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Yeah, don't worry about vacuum advance. Just hook up oil metering lines.

Some people drill and tap the outer edge of the manifold for two small fittings. It's easier than drillng into the carb.
Old 07-07-04, 10:32 PM
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OK, removed the oil metering lines and disabled the pump to them. I've been premixing at about 1 ounce of oil to every gallon of gas. I'll look up the timing stuff, thanks for the tip on that. I did advance the timing a bit already, which has helped, but I'm sure I could do a better job.

Think I should probably look into new jets, I just can't afford too much stuff right now.
Old 07-07-04, 10:35 PM
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OK, removed the oil metering lines and disabled the pump to them. I've been premixing at about 1 ounce of oil to every gallon of gas. I'll look up the timing stuff, thanks for the tip on that. I did advance the timing a bit already, which has helped, but I'm sure I could do a better job.

Think I should probably look into new jets, I just can't afford too much stuff right now.
Old 07-07-04, 10:37 PM
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OK, removed the oil metering lines and disabled the pump to them. I've been premixing at about 1 ounce of oil to every gallon of gas. I'll look up the timing stuff, thanks for the tip on that. I did advance the timing a bit already, which has helped, but I'm sure I could do a better job.

Think I should probably look into new jets, I just can't afford too much stuff right now.
Old 07-07-04, 11:23 PM
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That sucks, i hate dialup.
Old 07-08-04, 07:45 AM
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Premix is "the true path of light".. It is much better for your engine. The OMP basically dumps the oil in and it runs down your intake into the port. Premix is a full, even distrabution of lubracation. Where there is gas there is the oil. Your apex seals thank you...

Also, you get to enjoy the look of peoples faces at the gas station when they see you putting oil in your gas tank...
Old 08-12-04, 07:45 PM
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Mix oil in the gasoline? Terrific idea. I suppose I should disable the oil metering pump. Where can I find more information on this?
Old 08-12-04, 08:22 PM
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Originally Posted by Adventurer
Mix oil in the gasoline? Terrific idea. I suppose I should disable the oil metering pump. Where can I find more information on this?
You can seach "premix" and find stuff. Its simple though. just take off the OMP, make a blockoff plate. plug the holes on the carb, and premix 1 ounce of 2-cycle oil per gallon of gas.
Old 08-12-04, 08:33 PM
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Originally Posted by XLR8
Premix is "the true path of light".. It is much better for your engine. The OMP basically dumps the oil in and it runs down your intake into the port. Premix is a full, even distrabution of lubracation. Where there is gas there is the oil. Your apex seals thank you...

Also, you get to enjoy the look of peoples faces at the gas station when they see you putting oil in your gas tank...
Yeah, except the omp provides a proportional amount of oil to the amount of throtle used, which I don't think you can achieve with premixing. So unless is for race application, that's a drawback.

http://members.ij.net/mrmazda/cfaqtext.html#MIXOIL

Last edited by cdrad51; 08-12-04 at 08:37 PM.
Old 08-12-04, 09:55 PM
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Hmmm, that sounds weird to me. Increased throttle would = increased fuel/oil mixture. That would mean that using a premix would also mean increased oil at increased throttle. Right?
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