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12-04-2016, 05:32 AM | #1 |
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fuel and additive question
I have a new motor in my model A it has a police head b cam zenith carb power balanced fsi ignition insert rods and bearings hardened seats(exhaust) and valves and adjustable lifters.
That said i can get get mid-grade gasoline 89 octane no ethanol.I know alot of people add marvel mystery oil to their gas how much per gallon? Also gunk makes a lead substitute does this help protect say the intake valves even though the exaust seats are hardened. What about octane booster not needed or does it help? I know this question is opinions but i have recieved a lot of help here. |
12-04-2016, 06:50 AM | #2 |
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Re: fuel and additive question
The lowest octane today is OK for a Model A.
The fuel additive answers might resemble the 1-5 Star ratings on Amazon.com; just take your pick. |
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12-04-2016, 08:37 AM | #3 |
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Re: fuel and additive question
What did your rebuilder suggest? Obviously having good gas available will work to your advantage. I personally use one can of Seafoam per tank of gas. Wayne
Last edited by C26Pinelake; 12-04-2016 at 01:15 PM. |
12-04-2016, 09:46 AM | #4 |
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Re: fuel and additive question
4 ounces of MMO per 10 gallons of gas is what I use in my older cars and small engines.
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12-04-2016, 10:19 AM | #5 |
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Re: fuel and additive question
Since you have non eth 89 available to you use it. Octane boost is not needed and using MMO is your choice. Throw it in every tank or every few tanks or not at all again it's your choice. many like it to help lube the guides, carbon control etc. Your already at an advantage using better fuel
Last edited by Mitch//pa; 12-04-2016 at 07:59 PM. |
12-04-2016, 10:23 AM | #6 |
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Re: fuel and additive question
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12-04-2016, 12:52 PM | #7 |
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Re: fuel and additive question
Hi bn,
You hit the nail on the head. One can always ""witness" less cylinder wear at bottoms of cylinders where ample oil is available ..... far more cylinder wear at tops of cylinders where less top cylinder lubricant is available ....... thus causing a cylinder wear ridge at tops of cylinders. Plus, engine lubricant not only reduces friction ....... it also helps as being an additional coolant close to the combustion chamber. In my opinion, vintage 4 cycle engines with a lack of top cylinder lubricant indicates a debatable lower and rear heavy lead problem .... but not in the vintage engine ..... Last edited by H. L. Chauvin; 12-04-2016 at 12:53 PM. Reason: typo |
12-04-2016, 01:12 PM | #8 |
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Re: fuel and additive question
Hello, I'm new to the site, I have an 1950 f1 and a roadster 1923. I have a front crank leak on the f1 that is driving me nuts I had the engine rebuilt 6 months ago the 276, 4 in stoker she run great just that little front seal is a pain. IF you got some ideals let me know Thank you. Jim
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12-04-2016, 03:54 PM | #9 | |
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Re: fuel and additive question
Quote:
Jim, Go to the top of this page and click on "The Forums". Then click on "Early Flatheads". You will probably get the most help there. Good luck with your F1!
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12-04-2016, 05:38 PM | #10 |
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Re: fuel and additive question
MMO in the fuel is OK.......But I would also like to suggest a ZDDP additive in the oil before any gas additive.....
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12-04-2016, 06:09 PM | #11 |
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Re: fuel and additive question
I wonder how Model A's lasted before ZDDP was added to oil in the 50's? Probably needed a rebuild every 5,000 miles or so.
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12-04-2016, 07:44 PM | #12 |
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Re: fuel and additive question
Dino i am doing that per the advice given to me by the man who did my shortblock.
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12-05-2016, 08:48 AM | #13 |
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Re: fuel and additive question
Thanks,
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12-05-2016, 09:08 AM | #14 |
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12-05-2016, 09:22 AM | #15 |
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12-05-2016, 06:33 PM | #16 |
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Re: fuel and additive question
I am using Mobil delvac same specs as shell rotella for the same reasons. By the way Mitch i got that steering gear back together and everything back in the car hope to finish it and fire it up next weekend.
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12-05-2016, 08:05 PM | #17 |
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Re: fuel and additive question
ditto to Dino et al. Evidently zinc removed from oil because of havoc with catalytic convertors. Zinc additives study done by Porche Club sometime ago with recommendations for zinc products re; wear on flat -opposed 4 cyl's. STP had zinc in the red bottles but no longer sold in Cal. (EPA reg's), so any product with Zn may be beneficial.
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12-05-2016, 08:17 PM | #18 | |
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Re: fuel and additive question
Quote:
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12-05-2016, 08:24 PM | #19 |
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12-05-2016, 09:40 PM | #20 |
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Re: fuel and additive question
The zinc has been gone a long time now; has anyone reported definitive harm done to Model A engines that do not use additives? Seems like I heard many experts say some time ago that only modern, higher performance engines were vulnerable. It would seem that by now problems would be surfacing.....none of my Model A friends have reported any issues due to it.
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