Getting rid of T-stat on a D2 V8 4.6 - Defender Source
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  #1  
Old December 1st, 2011, 12:47 PM
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Julien Dalbin
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Getting rid of T-stat on a D2 V8 4.6

My wife's D2 is not going to see cold weather
any time soon, so in order to improve cooling
capacity I was thinking about taking out the
thermostat.

Top radiator hose to engine top and bottom
radiator hose to water pump.

Thoughts ?
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  #2  
Old December 1st, 2011, 12:55 PM
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You don´t take T-stat for any weather condition, only check for a properly working one and that´s it.

Cheers,
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  #3  
Old December 1st, 2011, 01:06 PM
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mark kellgren
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bad idea
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  #4  
Old December 1st, 2011, 01:08 PM
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barry f
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It sounds like you want to bypass the heater box but again not sure why
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  #5  
Old December 1st, 2011, 02:14 PM
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Julien Dalbin
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Quote:
Originally Posted by bjf View Post
It sounds like you want to bypass the heater box but again not sure why
No, I want to improve cooling. There is a T-stat mod available
on D web, they move the thermostat from a lower position on
the circuit to an upper position, on the top radiator hose. The idea
is to get more flow.

What's the down side of taking out the thermostat, other than
getting the normal operation temperature slower ?
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  #6  
Old December 1st, 2011, 02:54 PM
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John B.
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The engine will run poorly and inefficiently when not at normal operating temperature.

If you are having cooling problems, you should fix what is wrong, not apply some poorly thought out bandaid.
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  #7  
Old December 1st, 2011, 05:16 PM
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Julien Dalbin
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It's not real problems yet, but it could be anytime.
I feel too often that i'm running on the edge, traffic
jam, A/C on all the time, hot temperatures all year
long. I'm just trying to find the more sensible solution
to improve the cooling capacity.
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  #8  
Old December 1st, 2011, 06:06 PM
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Just do the mod on dweb with a 160 or 180 degree. You need a thermostat no question. There are a few fan options you can use from flexalite. The stock fan with the GM fan clutch moves a lot of air. Use straight water and water wetter from redline. This works well for me in the summer. You can add some hood louvers which don't look that bad.
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  #9  
Old December 1st, 2011, 09:36 PM
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Mark M
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Ceramic coating to the exhaust manifolds on the 4.6 in my old 90 made a very noticeable difference. Among other things, I could actually open the hood without burning my hand.
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  #10  
Old December 2nd, 2011, 07:56 AM
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Julien Dalbin
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Quote:
Originally Posted by Oxcart13 View Post
Ceramic coating to the exhaust manifolds on the 4.6 in my old 90 made a very noticeable difference. Among other things, I could actually open the hood without burning my hand.
I wrapped the headers already, I guess engine bay is
a little cooler, hard to say.
My plan so far is to get rid of cats and wrapped the pipes
all the way to the Y.
Also planning to change the A/C fan with two matched
puller.
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  #11  
Old December 2nd, 2011, 08:05 AM
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I think you need to keep the catalytic convertors. hood louvers help a lot per 2 DII owners I know.
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  #12  
Old December 4th, 2011, 02:37 PM
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Julien Dalbin
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Quote:
Originally Posted by rover4x4
I think you need to keep the catalytic convertors.
For a mechanical or a emission reason ?
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