World Library  
Flag as Inappropriate
Email this Article

Lead Replacement Petrol

Article Id: WHEBN0022027248
Reproduction Date:

Title: Lead Replacement Petrol  
Author: World Heritage Encyclopedia
Language: English
Subject: Motor fuel, Liquid fuels, 2,4-Dimethyl-6-tert-butylphenol, Pay at the pump, Dinonylnaphthylsulfonic acid
Publisher: World Heritage Encyclopedia

Lead Replacement Petrol

Lead Replacement Petrol (LRP) is a fuel developed to provide an alternative to leaded petrol. Leaded four star petrol was withdrawn from sale in the UK 2000, eight years after the last cars using it were made,[1] and LRP was introduced containing other metal salts (such as potassium or manganese), enabling the large numbers of cars still using the fuel to continue running.

Leaded petrol contained a substance known as tetraethyl lead or TEL, a compound of lead in liquid form originally added to petrol to increase its octane rating. A side effect of adding TEL is that a layer of lead compounds forms on the valve faces of the engine, retarding wear.

Lead is very toxic and lead compounds in exhaust gases escape into the atmosphere causing pollution. Impacts on human health are widely documented. This led to the introduction of lead-free petrol.

With normal lead-free petrol an adjustment to the engine's ignition timing solved pre-detonation problems (pinking or pinging) caused by the lower octane rating, but this did nothing to prevent accelerated valve wear. The use of lead in petrol had allowed the machining of valve seats directly in the cast iron or aluminium cylinder heads (or block of side-valve engines). Over time these seats would heat up, erode and even micro-weld the valve to the seat causing rapid damage.

Lead Replacement Petrol was introduced to address the issue of valve wear.

However, by August 2002, it was reported in the British national media that most petrol stations would soon be withdrawing Lead Replacement Petrol from sale, despite there still being some 1.5 million cars using it. The supply of the fuel has since dwindled away to practically none. Older cars frequently seen on Britain's roads at the time which used the fuel included the 1976-1983 Ford Fiesta, 1980-1986 Ford Escort, all but the newest Ford Sierras and most 1980s Austin Rover models.[2]


  1. ^
  2. ^ [1]

See also

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.

Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.