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

premixing

Old Jan 26, 2009 | 10:32 AM
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premixing

So my new to me FB is tucked away for the winter.
It is a premix setup, I was told to mix 1 oz. to every gallon. Now I have been reading the archives and see different idea's on the mix.
I would like to hear from people who do.....Can I get away safely with just mixing 1/2 oz.?????
I'm thinking it may depend on the oil you use???????
Thanks
Paul
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Old Jan 26, 2009 | 11:00 AM
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1 oz/gal is the accepted standard for premixing, and yes, I do premix. You can get away with 1/2 oz for storage, then add the other 1/2 oz/gal before start up. Be sure to add a can of Heet and and the appropriate amount of Sta-Bil so the fuel doesn't go stale during storage. If your MOP is still operational, limit the mix to no more than 1/4oz/gal..
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Old Jan 26, 2009 | 11:05 AM
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Sea Foam

I filled up and put in a can of Sea Foam to stabilize.
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Old Jan 26, 2009 | 12:17 PM
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mix

Thanks
Yeah I have it all set for storage for the winter...So I'll stick with the 1oz.
The MOP has been removed already.
Thanks
Paul
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Old Jan 26, 2009 | 08:03 PM
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If I were to premix i'd do what sgt fox did. https://www.rx7club.com/1st-generation-specific-1979-1985-18/richard-sohn-metering-pump-adapter-install-809207/
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Old Jan 27, 2009 | 05:28 AM
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I've always used 25 ml. per gallon of gasoline, since I don't have a MOP. That's a hair less than 1 oz. 1/2 oz. will be too little and result in the seals wearing out prematurely. If you do a lot of high-rpm driving, you may want to consider more than 1 oz.
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Old Jan 27, 2009 | 09:54 PM
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When you first start premixing, please pay close attention to your oil level, if your oil level starts rising your premix is not burning and getting scraped into the engine oil.

I have experienced this oil level rising phenom while using too heavy mix of oils that did not burn so well. While experimenting with how much per gallon of what kind of oil. I was looking for the desired amount of flexibility to the response and characteristics of how the throttle and car responded to each other with different octanes and premixes.
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Old Jan 28, 2009 | 10:09 AM
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premix

Originally Posted by mxd
When you first start premixing, please pay close attention to your oil level, if your oil level starts rising your premix is not burning and getting scraped into the engine oil.

I have experienced this oil level rising phenom while using too heavy mix of oils that did not burn so well. While experimenting with how much per gallon of what kind of oil. I was looking for the desired amount of flexibility to the response and characteristics of how the throttle and car responded to each other with different octanes and premixes.
Thanks
I'm ordering a case of the Idemitsu Rotary Premix, I'll give this a shot.
Paul
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Old Jan 28, 2009 | 02:10 PM
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Originally Posted by mxd
When you first start premixing, please pay close attention to your oil level, if your oil level starts rising your premix is not burning and getting scraped into the engine oil.

I have experienced this oil level rising phenom while using too heavy mix of oils that did not burn so well. While experimenting with how much per gallon of what kind of oil. I was looking for the desired amount of flexibility to the response and characteristics of how the throttle and car responded to each other with different octanes and premixes.
I'm going to have to disagree with you on this one. This is a common problem for turbo guys that premix. The combustion gases actually push past the side seals and oil control o-rings. The oil doesn't get 'scrapped' into the oil pan. What one ends up with is a fuel laden oil lubricating the engine.
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Old Jan 28, 2009 | 09:27 PM
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I would like you to agree with me, but offer more than my explaination, as I do not boost, and you can also do it, please PM and I can name 1 premix that you can try yourself and see the result.
I will also offer up that I might have pompus side seals allowing inconsistant blowby.

btw trochoid is right.
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