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Re: Lead additive

Derek hill
Many thanks

Since lead was eliminated from petrol I have found that no problem arises using modern exhaust valves. When I first started re-grinding valves more than 50 years ago it was common to find bad pitting on seats and even 'flats' on the valve head circumference. If you have a collection of old valves, check them with a magnet. Modern ones are non-magnetic, being made from suitable high grade stainless steel. If they are magnetic they are the old type, and were usable with leaded petrol, but are no longer suitable.

Location: just north of Cambridge

Re: Lead additive

David
Ruairidh Dunford
As is having to strip the carb to blow the water out, which, I understand is directly attributable to the hygroscopic property of ethanol.


I was told that because ethanol is plant based it contains a small amount of water. The distillate portion evaporates first, leaving this water behind.

Re: Lead additive

Thanks for your help

Location: New Forest

Re: Lead additive

Thanks for your information

Location: New Forest

Re: Lead additive

Thanks for your reply it was very helpful

Location: New Forest