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vapor lock ZS carbs vs SU carbs

To: <nass@yahoogroups.com>
Subject: vapor lock ZS carbs vs SU carbs
From: <ptegler@cablespeed.com>
Date: Wed, 30 Jun 2004 16:30:02 -0400
OK.... considering a ZS carb has it's float chamber on 
the bottom of the carb, where the SU has the separate float
chamber.... why would one be more prone to vapor lock
than the other.?   I'm purposely leaving that question open 
ended, as I'd like to hear peoples opinions on which carb 
absorbs more heat and is more prone (from peoples
experience) to vapor lock.

Second thought/question.....
Does it sound feasible that using a larger diameter fuel supply 
line,(say 5/16" vs the stock 1/4" metal line) wrapped along side
and around the front of the engine like it is on a Triumph GT6 
for example)  that the gas will be moving slower though the 
pipe, thus possibly absorbing more heat?
...or possibly for clarity should I simply ask.... Has it been 
peoples experience that  vapor lock is happening in the carbs 
or the feed lines?  And as so... why wouldn't a pump simply 
blow the air bubble (pushed by the fuel) into the float chambers 
of either carb style where it would simply vent via the chamber 
vent holes?

I'd like to make sure I understand this before I write up an
expose' on what's been going on with a friends car and what
'appears' to have resolved the problem.

tia

Paul Tegler
ptegler@cablespeed.com
www.teglerizer.com





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