Coping Without Leaded Gas


| October/November 1992


HC 89, Box50B, Eden, Texas 76837

If you own a gasoline engine manufactured before 1974, it probably was designed to use leaded gasoline.

Since 1986, EPA regulations have reduced the amount of lead that a refiner can add to gasoline by 91%, from 1.1 grams per gallon to 0.1 gpg. That leaves older and industrial-type engines, such as those used by many farmers, without protection against valve damage.

However, some gasoline engines made as early as 1971 were built with hardened valves and valve seats that are not affected by unleaded fuel. And most vehicle engines made after 1974 have hardened valves.

Engines designed to run on leaded gas have soft valve seats, specially designed for use with leaded fuel. These engines were designed to use leaded gas to lubricate exhaust valves. The lead is most important when an engine is running at high speed under a heavy load.

Even leaded fuel that meets the new requirements is getting harder to find. To avoid stiff penalties and fines for exceeding the EPA's standard, many refiners are keeping lead in gasoline blends well below the permitted level. In fact, only traces of lead are present in many 'leaded' fuels, making some companies' leaded and unleaded products virtually identical.






SUBSCRIBE TO GAS ENGINE MAGAZINE TODAY!

Gas Engine Magazine A_M 16Gas Engine Magazine is your best source for tractor and stationary gas engine information.  Subscribe and connect with more than 23,000 other gas engine collectors and build your knowledge, share your passion and search for parts, in the publication written by and for gas engine enthusiasts! Gas Engine Magazine brings you: restoration stories, company histories, and technical advice. Plus our Flywheel Forum column helps answer your engine inquiries!

Be sure to take advantage of the Square Deal Subscription Program.

  • No Missed Issues.

  • No Renewal Notices.

  • No Additional Cost.

The Square Deal Subscription Program is designed as a paperless transaction with automatic renewals at a preferred low rate.   With advanced electronic notification, a 100% satisfaction guarantee and an easy opt-out plan, the Square Deal Subscription Program is the best value, risk free, eco-friendliest way to subscribe.




Facebook YouTube


Copyright 2018, All Rights Reserved
Ogden Publications, Inc., 1503 SW 42nd St., Topeka, Kansas 66609-1265