goodings(at)yorku.ca
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 Posted: Thu Nov 30, 2006 6:29 am Post subject: Zenith-List Digest: CZAW Cowl Question Again |
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Initially, in our CH601HD with R912S, the oil and coolant temperatures
were too high. Two fixes took care of the problem. The first was to
increase the airflow EXIT area by cutting out quite a bit of fibreglass.
An increased intake area won't do much if the exit area is too restricted.
The exit area must be much bigger than the intake area. [However, this
fix can be uncertain if the lower back exit area of the cowl has a
down-turning lip on it. This lip, if present, creates a low-pressure area
beneath the cowl to SUCK the hot air out. My point is, if this lip is
present on your cowl (it wasn't on mine, but I've seen it on a CZAW-built
601XL), I wouldn't mess with the exit area.] The second fix was to make
sure the intake duct was a close fit around the radiator so that the air
has to go through the rad, and cannot escape around the edges. We added
fibrglass strips to improve the close fit. We did NOT increase any intake
areas.
John Goodings, C-FGPJ, CH601HD with R912S, Toronto/Ottawa/Waterloo.
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