How about ditching the engine run fan and using an electric? Sounds like you
have room for a puller fan. If a pusher fan is more efficient then explore
If you prefer to stick with the engine fan can you make the shroud two
piece? Make the upper half easily removable.
----- Original Message -----
To: "Shop Talk" <email@example.com>
Sent: Saturday, May 15, 2010 11:25 PM
Subject: [Shop-talk] Fan Shroud
> Guys, I've got a Morgan Plus 4. Several years ago I solved a low speed
> heating problem by making and installing a fan shroud ( the fan sits a
> 4 inches behind the radiator).
> Well I'm ready to do a version 2.0 of my shroud. The 1.0 version makes
> changing a fan belt a major undertaking. On the version 1.0 I carried the
> shroud to the rear so that it ended on a plan with the trailing edge of
> fan blades. What I would like to do is shorten up the shroud so it ends at
> the leading edge of the fan in order to make fan belt changes easier.
> The question: I know on a blowing fan the air flow is greater if the
> covers the fan blade tips. Is that also true for a sucking fan? It seems
> me that air spilling off the fan tips is not going to be a problem since
> objective is to pull outside air thru the radiator and since the shorter
> shroud will block air from looping back through the fan the performance
> should stay the same.
> What say the best bunch of guys on the internet?
> Bob Nogueira ( I'm no engineer but I play one in my garage)
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