----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----
There's more lead in 100LL than in the old 80. If the new seats are
harder to withstand the increased internal pressures caused by the higher
octane, they should be able to easily handle the auto fuel. Go for the new
and improved stuff.
----- Original Message -----From: [EMAIL PROTECTED]Sent: Tuesday, March 29, 2005 12:47 PMSubject: [COUPERS-TECH] Question about cylinders.----[Please read http://ercoupers.com/disclaimer.htm before following any advice in this forum.]----I recently sent a couple of cylinders to be rebuilt.The guy doing the work called me to ask me what fuel I use.I told him mostly car gas and 100 LL when I am on a long flight and there is nothing else available.His concern was about the seats of the valves. These are the original 1946 Continentals and the seats are made of brass. He said modern cylinders have steel seats which resist the 100 LL better.So my question is:If the cylinders were made in the 60's when all 80 octane fuel was leaded and now they use steel seats to tolerate the lead in the LL fuel, the 85 octane unleaded should be worse on the brass seats, not better.Or is it not an issue with the lead?More like temperature?Or maybe it is just the sales pitch?This was the first time anyone has told me that 80-85 octane gas (Car gas) is better than 100LL and I want to know more about this.I have heard pros and cons related to the valve guides and sticking, but nothing about the seats.What do the experts say?N87333Alan Fairclough============================================================================== To leave this forum go to: http://ercoupers.com/lists.htm Search the archives on http://escribe.com/aviation/coupers-tech/
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