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Harry Ferguson Tractors Discussion Forum
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Re: fuel additives

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gshadel

08-22-2005 10:12:28




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Dennis
the normal low-end octane gas ~86 or whatever it is, is just fine for your old Fergie. Octane rating is only important for high compression engines to prevent pre-ignition A.K.A. engine knock. Your Ferggy ain't a high compression engine.

There was some discussion on lead additive a few weeks back. You can probably scroll back to find that discussion.

Lead additives were originally added back in the "old" days to increase octane rating, same issue with high compression engines above.

The lead additive makers would like you to believe the lead somehow cushions or lubes your valves to reduce wear. You Z120 was designed to be a high hours industrial engine running 1950's era, "no frills" gas. Your Z120 has hardened exhaust valve seats and runs lower RPMs than most car engines. I ran my Z120 for ~5 years on regular gas and rebuilt it about a year back. I didn't see anything to suggest a problem running no lead. My opinion is the lead treatment is a waste of money.

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Zippy55

08-22-2005 14:12:50




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 pre-ignition and spark knock in reply to gshadel, 08-22-2005 10:12:28  
One minor comment, pre-ignition and spark knock are not the same thing. Preignition can be silent but very destructive by causing hot spots that burn holes in pistons or valves etc. Spark knock, or pinging (pinking in the UK) is caused by too low octane rating of the gas. The flame front increases compression and causes detonation of the gas from the pressure and heat. It is less destructive, at least in the short run, but of course should be avoided.

I agree the current gas has sufficient octane. The lead was originally added to raise octane of gas but turned out to help cushion the valves. I don't know if leaded gas was specified with Fergusons, but I would agree that at the low rpms these engines turn, leaded gas is probably not necessary.

One interesting thing, some guys used aviation gas in their hot rods. Turns out, this gas has way more lead than regular gas and huge lead deposits actually caused the values to not fully close and therefore burn up.

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