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Grant-o-vations Building something crazy? Trying something totally out of the box? Post it here. Lets see what all those wacky minds are doing out there. These posts should be somewhat technical in nature, but dont necessarily have to be 4x4 related.

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Old 09-09-2014, 09:35 AM   #26
joe231
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Default Re: My new track rig

Awesome!! Glad you got your radiator in time!
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Old 09-09-2014, 12:52 PM   #27
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Default Re: My new track rig

Good choice! that 4.2's a great motor, I used to have one of those and read everything on OffroadTb.com about'm. It's a really good idea to change the thermostat and clean the Throttle Body before they get covered up... Seams like 90% of the 4.2 questions on the trailblazer forums are those..
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Old 04-06-2016, 07:20 AM   #28
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Good choice! that 4.2's a great motor, I used to have one of those and read everything on OffroadTb.com about'm. It's a really good idea to change the thermostat and clean the Throttle Body before they get covered up... Seams like 90% of the 4.2 questions on the trailblazer forums are those..
So... We do have a overheating problem. I was suspecting that we do not have enough radiator, and we only had a 2500cfm electric fan. We bought a Volvo fan, two speeds and supposed to be 2500/5000cfm.

But, consider this. This January I took a trip to my property in Petersville. While driving down the main road I could sometimes go quite while without it over heating if I was easy on the throttle. Other times I was not so lucky.

At one point nearing the parking area the temp was climbing while going down hill, and it was cooling off going up. It could be a coincidence, but it seems to indicate that engine load is not 100% causing the issue.

A bad thermostat, opening slowly, opening partially, opening only sometime? Maybe we need to spend the $20 bucks and see.
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Old 04-06-2016, 09:56 AM   #29
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Default Re: My new track rig

Maybe Air lock in the cooling system? Where is the radiator mounted, Higher than the motor?
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Old 04-06-2016, 10:36 AM   #30
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Default Re: My new track rig

Not sure if this was his final mounting point though.

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Old 04-06-2016, 06:37 PM   #31
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Default Re: My new track rig

Quote:
At one point nearing the parking area the temp was climbing while going down hill, and it was cooling off going up. It could be a coincidence, but it seems to indicate that engine load is not 100% causing the issue.
Sounds like my wife's Legacy. Below 3k rpm, it puts out NO cabin heat. The engine temp doesn't vary, the waterpump just isn't doing much. That's my theory, anyway.
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Old 04-07-2016, 10:53 AM   #32
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We now have the engine in the front and the radiator top is higher than the engine.
I was concerned the trans was slipping and heating up, but our Ultraguage shows it staying between 175-190 even when the engine climbed to 250.

During previous trips it was pretty consistent about just getting hotter and hotter until we idled it and then it would drop fast.
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Old 04-07-2016, 10:56 AM   #33
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Oh, and here is a vid from the hunting trip last fall.

https://www.youtube.com/watch?v=zZbwpzk0DLc
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Old 04-08-2016, 02:31 PM   #34
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Default Re: My new track rig

May be a bad water pump. Cavitation at ram but moves fluid at idle. Have you checked to see how hot the radiator is when it's overheating? Also if it's a plastic water pump impeller it would be spinning on the shaft.
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Old 04-08-2016, 02:36 PM   #35
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The radiator gets very hot. I have had it puke out the overflow when I got distracted and did not notice the temp.
Our plan is to try the thermostat now, and if it persists, take the pump off and inspect.
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Old 07-10-2016, 05:15 PM   #36
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Sometimes 3.9 is not low enough.
Diff:

No Diff:

Oh, there it is:

And some NOS 5.8x gears:


We are hoping to use more gears in the future.

Last edited by samwe; 07-10-2016 at 05:17 PM.
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Old 07-10-2016, 05:50 PM   #37
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Default Re: My new track rig

Did you figure out the overheating issue?
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Old 07-10-2016, 06:05 PM   #38
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Not yet. Once we get the new gears in we will be out testing. We might also swap the original radiator back in, and while we are at it we will pull the pump and thermostat and verify functionality.
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Old 07-10-2016, 06:59 PM   #39
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We need to find someone to press of the bearings, swap the ring gear then press on new bearings.
While that is being done we will start on cleaning up the wiring and the cooling work mentioned above.

Should we just try Youngs gear or is there some other shop that will o good for us?

Also, we have the whole drive train configured to come out as one piece. We only have to disconnect the drive line and power steering hoses.

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Old 07-11-2016, 07:55 AM   #40
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And after we finish building the power panels , we should only have to disconnect the cab power from the engine skid. The skid will be self contained.
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Old 08-23-2016, 01:17 PM   #41
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Not yet. Once we get the new gears in we will be out testing. We might also swap the original radiator back in, and while we are at it we will pull the pump and thermostat and verify functionality.
And the thermostat and water pump seem to be fine.

We did learn something interesting. The coolant leaves the block via the lower hose and returns at the top. So it flows through the radiator bottom to top.
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Old 09-04-2016, 07:34 PM   #42
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We swapped to a Volvo 2 speed fan. Much like a Taurus fan, but with an easier to use mounting setup.
We built a nice relay setup but when testing the two speed BMW temp switch turned out to be bad and only the high speed circuit was activating.

We took it for a test anyway... The high speed switch comes on later than advertised because it is in the block and it is cooler than the head. Still, even though it came on 240+ degrees it cooled the engine back to 195 in just a few minutes while we were still driving.

We already order 2 new switches, one like we have and one 15 degrees cooler. We will use the cooler one.

We seem to have solved the overheating problem after all this time.

The lesson learned is avoid aftermarket electric fans.
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Old 09-04-2016, 10:43 PM   #43
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Glad you figured it out!
Are you taking it hunting this year?
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Old 09-07-2016, 05:10 PM   #44
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Glad you figured it out!
Are you taking it hunting this year?
Yep. Can't wait to get it out and see how it does.
And my winter camping trips will be more fun too!
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