The term spontaneous combustion is not applicable to a material
like petrol. The term relates to materials like wood dust, coal dust etc
that oxidises and because of its enviromnent, is unable to dissipate the
heat of oxidation. Temperature then steadily increases (and the rate of
oxidation also increases , exacberating the problem) till the products
"spontaneously combust"
Having said that, the problem of fuel vaporising in SU's etc is
well know here in Oz. The usual "cures" include;
insulating blocks between carby & manifold
"' "' "' mech fuel pump & engine block.
disposing of water heated manifold
insulated fuel lines that are connected to the block
ducting of air into the engine bay
fitment of a front spoiler to create a negative pressure zone and hence
force air thru the rad & engine bay
In race cars, we actually use fuel coolers which are usually consist of
a tin containing ice, thru which the line is routed
A contingent of Aust healey owners just drove thru the Northern
territory and part of northern West Australia so i guess they solved the
problems
Terry o'Beirne
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