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
that possibility.
If you prefer to stick with the engine fan can you make the shroud two
piece? Make the upper half easily removable.
Eric Russell
Mebane, NC
http://home.mebtel.net/~ejrussell
----- Original Message -----
From: <nogera2@att.net>
To: "Shop Talk" <shop-talk@autox.team.net>
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
> over
> heating problem by making and installing a fan shroud ( the fan sits a
> good
> 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
> the
> 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
> shroud
> covers the fan blade tips. Is that also true for a sucking fan? It seems
> to
> me that air spilling off the fan tips is not going to be a problem since
> the
> 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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