faulter on accelleration

[ardiesse]

Vern,

I use regular 91 octane unleaded.  One of my cars has hardened exhaust valve seats, one doesn't.  I've had exhaust valve troubles with the "modified" head, now fixed (hopefully) by fitting new red motor exhaust valves; and no problems at all with the "unmodified" head.  Go figure.  On a long trip I'll use additive in the "unmodified" head for peace of mind.

Rob

[Errol62]

I have been adding a preservative to my petrol in infrequently used engines. It's the same one I use in my chainsaw and brush cutter.

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[my8thholden]

ok thanks Harv ...Shell V Power ,don't they sponsor Ford ?

[my8thholden]

Errol ..Thats interesting about a " preserative" in non ethanol fuels..I never use E10 in anything that may be stored,I learned that the hard way ,when plant based ethanol residue dries in a carby ,its a bath in Citrus based paint stripper ..if it must be used ,drain it out before storage..never put it in a fire fighting pump , will not work just when you need it most ,have fixed 2 for neighbours ..Vern ..

[Errol62]

I was told that any modern petrol goes off and loses it’s octane rating relatively quickly. The chainsaw sits at least half the year, as does the brush cutter. They always start first pop now. I do use premium in them. Probably wouldn’t bother with the grey motor. To date I have been running my 186 on premium but will see how it goes when I start using it in earnest.
Cheers
Clay


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[Harv]

Modern fuels go off (as did older fuels) but I doubt very much that octane is massively impacted.

Cheers,
Harv

[my8thholden]

Clay ..when you say " preservative " in fuel ,do you mean lead replacer additive to preserve the old valve seats that haven't been inserted ? Vern

[Errol62]

No Vern
Stops the fuel going off that is all.

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[Fraze]

I went to a talk by a fuel company guy a while back. Apparently modern fuels without lead degenerate faster than they used to. Something to do with “aromatics” from memory. Any way the message was that 95/98 octane fuels have a longer shelf life than 91. Again from memory 91 has a short shelf life of about a month before it starts to degenerate. Fuel additives such as Stabil slow down the degeneration, but don’t stop it. Cheers, Fraze

[my8thholden]

ok .thanks fellas ,I will use 95 or 98 with Stabil or similar ..cheers Vern .

[my8thholden]

Bugger ..faulter has come back ,even bit worse ,time to change the carby plunger as first solution ,as a soften up and a easing out of the brass spreader under the cup has worked for a while,it is still a 60 year old leather component ...Vern ..