Premix or no premix? - NoPistons -Mazda Rx7 & Rx8 Rotary Forum

2nd Generation Specific 1986-1992 Discussion

Premix or no premix?

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Old 11-05-2002, 02:26 PM
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Does it work if car is only used occasionally? Is it a good to do just in case the OMP is not working? I have a '88 13B NA convertible, used to premix in my '79 but found it gave me a rough idle sometimes when cold. Follow the 100:1 ratio, but I only use the car 1 or 2 weekends a month so I'm wondering if it settles. What brand do you use?
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Old 11-05-2002, 02:33 PM
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if you still have the metering pump, you dont need to do 100:1.

any brand that is tcw3 is good



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Old 11-05-2002, 08:47 PM
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Originally Posted by pmr2000' date='Nov 5 2002, 11:26 AM
Does it work if car is only used occasionally? Is it a good to do just in case the OMP is not working? I have a '88 13B NA convertible, used to premix in my '79 but found it gave me a rough idle sometimes when cold. Follow the 100:1 ratio, but I only use the car 1 or 2 weekends a month so I'm wondering if it settles. What brand do you use?
Go with a 400:1 ratio. Put it in BEFORE you put the gas in. THat lets it mix in a little better. I like the Valvoline 2 stroke, but like Mike said, any TCW3 certified will do.
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Old 12-02-2002, 12:24 PM
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What is a 400:1 ratio mean for a regular 12-14 gallon fillup?
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Old 12-03-2002, 02:13 PM
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I just put in an 8 oz. bottle for each ~15 gallon fill up which is more than enough.
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Old 12-04-2002, 05:55 PM
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I've used premix for awhile now. 4oz per fill-up.
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Old 12-04-2002, 07:00 PM
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i just noticed that the 787b uses a metering pump. they had almost undetecable wear after 24 hours of racing



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Old 12-04-2002, 07:02 PM
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i never used it.
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Old 12-04-2002, 08:56 PM
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Premix does lower your octane. So if you have your metering pump hooked up, not sure why you would need premix.
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Old 12-04-2002, 09:20 PM
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lower octane on an NA might not be so bad



and didnt the 787b use different apex seals and treated housings?
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