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Jul 23, 2011 8:06 am
Jul 23, 2011 8:06 am
Subject: Re: Unleaded Conversion...
David's comments about fuel apply equally to all of our cars. My 1925 12/24 Lagonda ran very hot and so using modern materials for valves and seats is as valid for it as well. There is also a lot of knowledge and expertise on how to improve the circulation on the M45 Meadows engine to run cooler.
Not only does unleaded burn hotter, but with low compression engines it burns slower, hence the need to advance the timing to get the flame well and truly alight before the exhaust valve opens. The late Arthur Jeddere-Fisher, stalwart of the VSCC and legal counsel to HMRC had the law changed to allow people to legally "cut" their petrol with kerosene (heating oil) to try and alleviate this problem, particularly with Edwardian motor cars. The mixing had to be done in the car's petrol tank.
Colin
David's comments about fuel apply equally to all of our cars. My 1925 12/24 Lagonda ran very hot and so using modern materials for valves and seats is as valid for it as well. There is also a lot of knowledge and expertise on how to improve the circulation on the M45 Meadows engine to run cooler.
Not only does unleaded burn hotter, but with low compression engines it burns slower, hence the need to advance the timing to get the flame well and truly alight before the exhaust valve opens. The late Arthur Jeddere-Fisher, stalwart of the VSCC and legal counsel to HMRC had the law changed to allow people to legally "cut" their petrol with kerosene (heating oil) to try and alleviate this problem, particularly with Edwardian motor cars. The mixing had to be done in the car's petrol tank.
Colin