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norman nock fan shroud

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John,

That explains (to me at least) why you have experienced some temperature reduction by insulating your cold air duct. As it turned out (I believe), the blower actually feeds on a large volume of air and will draw the surrounding air to it. Without the blower, air is not pulled to the duct opening and only air that is moved through the grill, from the forward motion of the car, will be moved to and through the duct. The slower the forward movement of the car, the slow the passage of air through the duct, and the more time that duct air will be exposed to engine compartment heat.

Ray (64BJ8P1)
 
Steve,

When installing your intake extension tubes, I would suggest installing drain tubes in the extensions close to their attachment with the original cold air duct inlets to eliminate water if caught in the rain on a hot day. A more elaborate extraction design could be developed but I expect would not be necessary unless you are using your Healey as a daily driver. I look forward to reading of your experience with the additions and how you introduced them into the car.

Good luck,
Ray (64BJ8P1)
 
steveg said:
Will be making air intake duct extensions to reach between the intakes and the grille. The idea being to intake cool air and not recirculated hot air as is now the case as described above.

I agree with Ray - with a fresh air blower, the hot air flow is constant and don't believe it's being heated by the headers during its very brief passage through the intake duct.
Click to expand...
On my car I have one modified aluminium Rally air duct - I have eliminated the two ears, and the side holes. I have cut the lower inclined part of aluminium and create a flat floor up to the the frame for my Oil cooler-
so I have one tunel dedicated to the Oil cooler that give also utilized the air to the lower part of the water radiator that receive cool air from the duct in the upper part , a pusher termostatic electric fan 14" and a TEXAS fan on the engine (very difficult explication for one NON native, better this two photos)

https://picasaweb.google.com/lh/photo/Nxh9AWCuMVAKHMJbwOAB_9MTjNZETYmyPJy0liipFm0?feat=directlink
https://plus.google.com/photos/1127...5646546195736843538&oid=112770819864514987162
final solution due difficult to fit the grille-- and effectiveness of the ears for the increase of air cooling
https://picasaweb.google.com/lh/photo/VJJWPK3bGSPG-vLK4jRT-tMTjNZETYmyPJy0liipFm0?feat=directlink
This MOD take to me a good separation from air destined to engine bay and air destined to cooling the cockpit -
probably one better insulation with Dinamate insulation foil on the blower pipe zone can help to have fresh air from the begin of the blower action, in the cockpit
My next project is to add one all around shroud 4 or 5cm large, around the texas fan,
I haven't cooling problem on the car, but my idea is that shroud help a lot the air circulation in the engine bay, driving the pressure to the exhaust/carbs zone
 
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