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  #21  
Old December 10th, 2013, 04:01 PM
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John B.
1991 Defender 90, 200TDI
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Quote:
Originally Posted by FSU_Disco View Post
Have you enlarged yours at all?
Yes. I have a heater that has twice the air flow and three times the heat output (measured in the vehicle). Everything has been made larger. Before and after the change, I measured the flow rates and heat outputs, both in and out of the vehicle.

It is much more heater than a 90 needs, even at -40. Would be really nice in a 110.
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  #22  
Old December 10th, 2013, 04:05 PM
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John B.
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My stock heater was flowing 240 cfm at the inlet out of the vehicle and 160 cfm in the vehicle with the deflectors removed. The bulkhead area does not calculate to be "very" restrictive with the stock heater, but probably contributes a bit. You would need to open up the lower vents first. I'm not sure if NAS trucks have different vents.
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  #23  
Old December 10th, 2013, 05:39 PM
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mark kellgren
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Originally Posted by nathanwind View Post
BUT...keep in mind I firmly believe it's the bulkhead cutout along with the fan that make the diffference overall.
AND...keep in mind I already did the cutout to my bulkhead
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  #24  
Old December 10th, 2013, 06:04 PM
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this has been a very informative and helpful rant
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  #25  
Old December 10th, 2013, 06:37 PM
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peter
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I cut the hole in the bulkhead while I had the engine out. Interested to see how that goes. And while taking apart the dash the grommets for the defrost tubes were half on/half gone. Curious to see how that helps.
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