paul(at)eucleides.com
Guest
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 Posted: Sat Sep 13, 2008 10:47 am Post subject: 100 LL in Briggs and Stratton (way off topic) |
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On Sat, September 13, 2008 6:47 am, Dave wrote:
| Quote: | Perhaps not related, but try running your Briggs on 100LL and see how long it is until
a valve sticks. It won't be long.
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I suspect that depends on the valve design. Here's why I say that; I have a fairly old
Toro (1975 vintage) with, I think, a Tecumseh engine and it has a sticker on the gas
tank that says "Warning Use Only Regular Leaded Gasoline - Use of Unleaded Gasoline
Will Void the Warranty." It runs on unleaded fine but it is so warn out the oil smoke
burns my eyes when mowing. It has such low compression that it spins over freely when
cold with no apparent compression. I can no longer start it with the recoil starter
cold. I use an electric drill motor with a 11/13" spark plug socked chucked on it and
I put that on the flywheel and spin it up to 1200 rpm and it fires up in a cloud of
smoke. It starts on the first pull when warm. It uses a quart of oil in one lawn
mowing. Have to top off the oil 3 or 4 times while using under a gallon of gas. The
scroll case completely wore through and I laid up fiberglass to repair it. I now have
a new Honda self propelled mower but that old Toro is so light weight that it is super
for trimming around trees and beds.
I think it wasn't the type of gas that hosed the motor, I think it was using it on a
steep sideslope while low on oil. Many years ago my son used it to mow neighbor's
lawns for some cash and didn't know about regular oil checking. He ran it nearly empty
on oil mowing on a sideslope. Probably partially seized or got the rings so hot they
relaxed. I think that because when it's warmed up, it has some compression. Cold it
has none.
--
Paul A. Franz, P.E.
PAF Consulting Engineers
Office 425.440.9505
Cell 425.241.1618
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