Ref. recent discussion regarding risk of fuel vapor lock and how to shield
the fuel system from engine heat.
Attached is photo and sketch of the carb heat shields I made out of s/s
steel plate. Fixed to the exhaust pipes by s/s hose clamps. The clamps
expand and contract in approximate sync with the exhaust pipes, so no
cracking discovered and no re-tightening required. As will be seen, the
carbs have heating blocks installed, which (as stated by Graham) makes the
factory heat shields difficult to use.
All fuel hoses forward of firewall are protected by both fire sleeve and
heat sleeve (claimed to reflect approx. 90% of radiated heat) - see photo.
Both purchased from racing car supply shop in the UK (don't recall name, and
I am away from my file). I also use the heat sleeve on oil lines running
very close to the engine.
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Regarding the fuel return restrictor: I use the restrictor supplied by the
factory in 2001. Do not know the hole diameter, but it is less than 0.5 mm.
The opening is indeed surprisingly small, but bear in mind that gasoline has
very low viscosity compared to e.g. water.
(I sent an earlier message today with same heading, but it appears it did
not go through. If it does pop up, pls disregard it)
Regards
Svein
LN-SKJ
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