octane booster and lead substitute

axe55

Member
With todays gas, does the older tractors (1966 930) need the lead substitute additive?.... Also is the octane booster worth the money? Or should i just buy the higher octane gas? Thanks in advance john
 
Octane booster might be ok, but be careful with the
lead substitute.

If your tractor has the newer valve guides the lead
will seize the engine. Guess how I know that??????

My local co-op offered lead gas one summer for older
tractors, I bought some as my tractor is a 1957
Ferguson. In about two weeks the motor got so tight that it
quit running. When mechanic rebuilt the head he
said he had to beat it apart where most of the time
these old tractor heads almost fall apart on his
work bench.

That is just my story using a lead substitute.

End result, if you are not sure that the tractor has
not been rebuilt then do not use the lead gas,
because when they rebuilt the motor they used the new valve
guides and they will be different than the original guides and
do not need leaded gas.
 
(quoted from post at 00:09:29 04/19/14) With todays gas, does the older tractors (1966 930) need the lead substitute additive?.... Also is the octane booster worth the money? Or should i just buy the higher octane gas? Thanks in advance john

Use gasoline with an octane rating as recommended in your owners manual. Any kind of additives do nothing more than put your money into someone elses's pocket. Your tractor does not need them.
 
I run a 930 gas on 10% ethanol little higher octane than straight unleaded. I add just a little diesel to slow the burn down under a load or it will ping. Not saying anyone else should do this...just how I deal with today's gas in old engines. Cheap motor oil may work too
 
did your tractor leave the factory with hardened exhaust valve seats?

if so.. forget the lead substitute.

For a bit of interesting reading... tetra ethyl lead was used as an octane booster.. :)

Ethanol happens to boost octane too.

higher the octane. harder it is to ignite the fuel.

As another poster said. a lil diesel in the gas will raise it's octane as well.

low rpm, low compression engines don't benefit from super high octane fuel that combats ping and spark knock / predetonation....
 
Thanks everyone, you guys have saved me from a big headache. I almost bought the lead substitute. I always thought the opposite about octane. Thanks again
 

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