NAS 110 4.6 Cooling - Defender Source
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  #1  
Old October 4th, 2010, 04:43 PM
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NAS 110 4.6 Cooling

I recently updated my tired 3.9 to a new 4.6. Running around town and at idle, the temp is fine (never over 200). However, on long climbs at freeway speeds, I creep up into the 220-230 range and it's making me a bit nervous, so I'd like to beef up the cooling system. I thought I'd post and see what others have done.

I retained the V-Belt setup and still have a 1.4 T-case (so I'm running about 3k RPM at freeway speeds). The radiator seems to be working OK. I've replaced the temp gauge with a VDO and VDO sender. I've confirmed it's readings. My two front electric fans are working fine and run continuously when the temp is >205.

I figure I've got three areas of enhancement: radiator, fan, cowling.

My fan is the original 7-blade. Does anybody know which 11-blade part is a bolt on? I've found two 11-blade part numbers: ETC1275 and ERR3439. The blade on my 97 D-90 is 11 and the cowling (ESR3226/ESR2847) looks a bit better designed. Anybody know if that'll bolt on (doesn't looks like it)?
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  #2  
Old October 7th, 2010, 07:43 AM
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J. Michael McCaig
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I can't help with the fan question but when I installed the 4.6 in my 110, I used an after-market external oil cooler instead if the one built into the radiator. I think it really helps to get that extra heat out of the radiator. I have no temp. problems at all even when towing heavy loads.
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  #3  
Old October 7th, 2010, 09:05 AM
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Hey Newfer!
I haven't installed my Pendy-flex fixed fan on my 4.6 yet.
Wanna give it a try?
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  #4  
Old October 7th, 2010, 05:54 PM
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Update: I just *thought* the radiator was OK. I pulled it anyway and sent it to the radiator shop. 2/3 plugged! It's definitely better so far. Real test will be some hills at speed (i.e. my drive home).

Rod, Pendy's fixed flex fan was definitely in the back of my mind. You're a mind reader. I may take you up on that, but let me get some more miles on it first; especially with the "new" radiator. Thanks for the offer!

Plugging in a 4.2 ROM this weekend.

Mike, thanks for the data point. It's good to know that the stock cooling system is capable. Are you still running a 1.4 Tcase?
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  #5  
Old October 7th, 2010, 06:04 PM
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Chance - contact Brent @ Columbia Rovers for ceramic coated manifolds. Big help to reduce temps under hood on my 4.6
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  #6  
Old October 7th, 2010, 06:09 PM
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I thought you were supposed to sawzall some holes in the side of the bonnet.
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  #7  
Old October 7th, 2010, 06:20 PM
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Quote:
Originally Posted by Oxcart13 View Post
Chance - contact Brent @ Columbia Rovers for ceramic coated manifolds. Big help to reduce temps under hood on my 4.6
Thanks Mark, I'll look into that.

------ Follow up post added October 7th, 2010 04:20 PM ------

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Originally Posted by o2batsea View Post
I thought you were supposed to sawzall some holes in the side of the bonnet.
Yeah, that ain't happening.
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  #8  
Old October 7th, 2010, 06:41 PM
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I was kidding.
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  #9  
Old October 7th, 2010, 06:54 PM
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Quote:
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I was kidding.
I figured as much.

------ Follow up post added October 7th, 2010 06:37 PM ------

Ride home was uneventful. A shade over 200 running 75mph up 1300' to home. Radiator, case closed.

She runs like a scalded dawg! Sure was nice not downshifting out of 5th for a change.

With a new 4.6, ported and polished heads, a new R380 and rebuilt LT230, she's all new again at 148k.

Gotta try the 4.2 ROM this weekend. You running one Rod? If not, I've got extras you can have.
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  #10  
Old October 7th, 2010, 08:53 PM
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Quote:
Originally Posted by o2batsea
I thought you were supposed to sawzall some holes in the side of the bonnet.
Haha did anyone notice if the Dr.'s 90 sold?
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  #11  
Old October 7th, 2010, 09:10 PM
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I bought it...I don't mind the holes- just replaced all the gauges with VDO units figuring that there was something up with the old temp gauge or sender. Sure enough, the temp sits right at 200 or below. I can live with that...
-Tim
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  #12  
Old October 8th, 2010, 07:53 AM
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Thumbs up

Quote:
Originally Posted by newfD90 View Post
I figured as much.

------ Follow up post added October 7th, 2010 06:37 PM ------

Ride home was uneventful. A shade over 200 running 75mph up 1300' to home. Radiator, case closed.

She runs like a scalded dawg! Sure was nice not downshifting out of 5th for a change.

With a new 4.6, ported and polished heads, a new R380 and rebuilt LT230, she's all new again at 148k.

Gotta try the 4.2 ROM this weekend. You running one Rod? If not, I've got extras you can have.
Chance,

Good news it's running well. Where did you source the 4.6L? Are you running the stock 3.9L chip now?

Cheers...

Mike
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  #13  
Old October 8th, 2010, 10:18 AM
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Mike-

The good guys at Pikes Peak Rovers hooked me up with a new long block that they had purchased from AB for another customer's Rover. Long story short, they bought it back with only a couple thousand on it. So I got a steal. Yup, still running the stock 3.9L chip.

Still not sure if I should change the 1.4 to a 1.2.

Quote:
Originally Posted by Grover View Post
Good news it's running well. Where did you source the 4.6L? Are you running the stock 3.9L chip now?
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  #14  
Old October 8th, 2010, 10:53 AM
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Still not sure if I should change the 1.4 to a 1.2.
No..
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  #15  
Old October 8th, 2010, 11:49 AM
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No..
That's my hope as I spent the $$$ to have Dassler rebuild it.
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  #16  
Old October 8th, 2010, 01:16 PM
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I'm running a 1.2 t-case. The 4.6 has so much torque that I am very happy with the combo, even when towing a tractor and bush-hog...but then again I only deal with the Blue Ridge Mtns where I am.
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  #17  
Old October 8th, 2010, 02:33 PM
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With our altitude and hills, stick with the 1.4. The fact that Rob built it just adds to the decision. Congrats on the 110 running well. I'd still get the manifolds. Mark
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  #18  
Old October 8th, 2010, 03:34 PM
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Quote:
Originally Posted by Oxcart13 View Post
With our altitude and hills, stick with the 1.4. The fact that Rob built it just adds to the decision. Congrats on the 110 running well. I'd still get the manifolds. Mark
Yah, that's what I'm thinkin as well. Still looking at the manifolds and perhaps a 4 row radiator rebuild. But as she's running cooler now, that can wait until next summer. Done spending money (for now, of course ). Thanks Mark!

------ Follow up post added October 8th, 2010 01:37 PM ------

Quote:
Originally Posted by LRover View Post
I'm running a 1.2 t-case. The 4.6 has so much torque that I am very happy with the combo, even when towing a tractor and bush-hog...but then again I only deal with the Blue Ridge Mtns where I am.
Good to know. Interesting side note: I've had my 110 for about 5 years and always assumed it was a 1.4. When Rob rebuilt it, I found out it was a later LT230 and a 1.2! He put it back right, of course. A 3.9 and a 1.2. No wonder I couldn't get out of my own way.
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  #19  
Old October 9th, 2010, 05:53 PM
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Popped in a 4.2 ROM today. Definitely seems to be snappier. Rod, if you're still running the 3.9 ROM, give me a call. I've got extras and it's not even a half a beer job.
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  #20  
Old October 10th, 2010, 07:53 AM
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200 is too hot
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