Quote:
Originally Posted by Monster
It appears that you have not applied the suggestions from a number of folks that have been through this issue, As Olddog, 767jockey and Brettco observed the design of your "old" shrould appears to be an issue (not allowing sufficient draw). By increasing the space between the shroud and radiator to a minimum 1" at the outside edges and tapering to 2" at the fan you will increase the draw through the entire radiator which will improve airflow/cooling at both low and high speeds.
Try this, what do you have to lose at this point.good luck,Mike
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Mike, you might want to re-read this entire thread again. I have applied or am planning to try EVERY recommendation made except for going to 100% coolant and plugging the bypass valve. The prior is not even worth trying and the latter is on the list to be tried. I have been very systematic in my approach and SOME of the suggestions were tried repeatedly before I even made the first post. With regard to the flat aluminum shroud, it was installed as one of the things to try and solve the INITIAL overheating problem. After installing it, it caused more problems by making temps rise even while the car was moving. But after removing it, we are back to the original problem, which is the car is fine while moving and overheats slowly when is sitting still for more than 5 minutes. We did try spacing it back 1" and that made no difference, but that could be due to this shroud's design.
I recognize that this thread is getting long and some of you don't want to read it all. Just so everyone is clear on where we stand and what i am doing next in sequence:
**The car runs great and stays cool (180-185*F) while moving. The JEGS aluminum shroud screwed that up, both installed almost touching the back radiator surface and spaced 1-1.5" back from the radiator's back surface.
** The car slowly begins to overheat when sitting still for any period longer than 2-3 minutes. If I don't start moving, it will eventually hit 210F*+.
** The hottest I have let it get is 215F. Not going beyond that.
** I have backed off the initial timing from 20* to 16* and re-tuned the carb. Based on the plugs and vacuum gauge it is tuned correctly, but we won't know for sure until I get the cooling issue fixed and go hit the chassis dyno.
I am currently trying various sizes of restrictors, as recommended. Next step will be to try and plug the bypass as recommended. I am also chasing a smaller diameter water pump pulley, as recommended. Last steps will involve a different shroud/fan combo and finally, a new high-capacity radiator.