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  #26   IP: 76.7.144.132
Old 03-05-2013, 04:32 PM
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Marian Claire Marian Claire is offline
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If you want a simple, sure fire way to run at "appropriate temp" remove the T-stat and set up a recirculation loop. IIRC that was the original A-4 set up.
Dan S/V Marian Claire Yeeha # 1000
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  #27   IP: 128.183.140.38
Old 03-05-2013, 05:42 PM
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Quote:
Originally Posted by olebiker View Post
Thanks for all the input.
After exhaustive investigation, I've determined:
There are no restrictions.
There is a huge amount of water pumping through the system.
Even with the bypass valve closed, open or anywhere in between the water outlet (at the back of the manifold) temp changes very little.
The temperature is fairly uniform anywhere on the motor. I used a infrared temp sensor for an hour testing all different bypass valve settings. No hot spots. Water leaving the manifold got to about 86 degrees and stayed there. The head never got over 105 anywhere at anytime.
So, I'm going to leave the stock single stage tsat in and just run her.
This is most perplexing! It's almost as if the bypass valve (or the check valve) was stuck closed, forcing all the cooling water through the block all the time. But, based on your previous posts, that's clearly not the case.

Did you ever try removing the bypass valve & check valve, and installing a straight piece of hose from the tee at the side water plate to the bypass inlet on the thermostat cover, as John Cookson suggested? This should produce almost no restriction in the bypass circuit, causing most of the cooling water to bypass the block, and the engine should heat up quite rapidly. If it doesn't, it means you're not bypassing enough water for some reason.

Perhaps some pictures of your plumbing and your thermostat mounting will give us some clue as to what's going on here.
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  #28   IP: 132.3.41.79
Old 03-08-2013, 03:40 PM
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Sammckay Sammckay is offline
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Thermostat

Thermostat is stuck open...
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  #29   IP: 199.168.148.136
Old 03-08-2013, 05:11 PM
JOHN COOKSON JOHN COOKSON is offline
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Quote:
Originally Posted by Sammckay View Post
Thermostat is stuck open...
Been there. Done this. See posts #3 & 4.

TRUE GRIT
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  #30   IP: 166.137.209.173
Old 03-19-2013, 04:47 PM
olebiker olebiker is offline
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Finally, heat!!!!

After exploring every avenue suggested, and some, I took the thermostat and plugged the 1/4" hole and drilled an 1/8" hole in the flange. The motor heated to 180 with the bypass fully open. Closed it about 5 degrees and.......wait for it! The temp dropped to 155-165 and stay there at cruising speed for an hour. I will monitor the temp but this looks like a solution to too much water flow. As long as the little hole doesn't plug, it should be good.
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  #31   IP: 199.168.148.137
Old 03-19-2013, 05:46 PM
JOHN COOKSON JOHN COOKSON is offline
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I've Been Around This Mulberry Bush.......

Quote:
Originally Posted by olebiker View Post
After exploring every avenue suggested, and some, I took the thermostat and plugged the 1/4" hole and drilled an 1/8" hole in the flange. The motor heated to 180 with the bypass fully open. Closed it about 5 degrees and.......wait for it! The temp dropped to 155-165 and stay there at cruising speed for an hour. I will monitor the temp but this looks like a solution to too much water flow. As long as the little hole doesn't plug, it should be good.
My RWC A4 was running at 180*-190*. Clamping the bypass hose brought the temp down to ~140* so I ordered the Moyer bypass restriction kit. After I installed the restrictor and valve from the kit the temp wouldn't even get up to 120*. By removing the restrictor and keeping the valve wide open I now run at ~140*. Apparently the wide open valve provides the correct amount of restriction for my engine.
Each A4 seems to be different in the amount of restriction needed.

TRUE GRIT
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