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Old 07-18-2014, 11:49 AM   #1
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67 390FE overheating??

Ok guys, here goes.....

Just finished my engine upgrades:
-aluminum intake (390 street master )
-aluminum water pump (edelbrock)
-Underdrive aluminum pulleys
-MSD 6AL
-MSD distributor (mech. Advance)
-new MSD custom wires
-original radiator (flushed and cleaned)
-new rad. Hoses
-new thermostat (160')
-electric fan (min. 2500cfm)
-new alternator (100amp)

So with all these ad dons and just had the car tuned, I'm still going over 210-230degrees on my temp!!
On the highway the temp sticks to around 180-190. As soon as I get off and drive on small streets the temp climbs quickly. PLEASE throw me some ideas.....Click image for larger version

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Old 07-18-2014, 12:33 PM   #2
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Looks awesome. You need a fan shroud. My sons 67 was doing the same thing. Fan shroud made a difference, especially if you're good at highway speeds.


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Old 07-18-2014, 12:33 PM   #3
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Air bubble in the system?
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Old 07-18-2014, 12:36 PM   #4
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I do have a a fan shroud, a custom one I made. I'll post more picks. And air bubble?? What's that all about?


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Old 07-18-2014, 12:41 PM   #5
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If you drain you engine and then fill it up you can trap air in the cooling system if you run the car with the rad cap off the bubble will make its way out
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Old 07-18-2014, 12:44 PM   #6
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If air is trapped in the system, that can cause an issue. Did you drill a 1/8" hole in the thermostat? That will allow the air to pass through.

Also, I've heard that if you have compression issues that can cause overheating.
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Old 07-18-2014, 12:46 PM   #7
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Ok, I'll ask the shop about that air bubble issue. But we have ran the engine without the rad cap.


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Old 07-18-2014, 01:32 PM   #8
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Also, what's your timing set to? Too much timing can cause heating issues.
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Old 07-18-2014, 04:48 PM   #9
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Well, there goes another useless speed shop that can't solve problems for me and charges for it too!
They're telling me it's because of the electric fan. As for the timing, it should be at around 18-35 ish...
The car runs great, no pinging at all.
Plenty of power and it boogies! But, temp keeps heading up.


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Old 07-18-2014, 05:23 PM   #10
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Gonna try the old clutch fan setup that was on originally and see what happens. Maybe pick up a fan shroud



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Old 07-18-2014, 05:38 PM   #11
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Question, is your temp gauge the stock type, or is it newer? I know the stock ones are all relative, so it being high in the gauge doesn't necessarily mean it's overheating. If you haven't, I would stick a separate thermometer in the top of the rad so you can see how hot the water is when the thermostat first opens, just to be sure the gauge is correct. Just figured its worth mentioning.
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Old 07-18-2014, 06:39 PM   #12
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Good one, it's one of the first things I thought of. The gauge is new, and at least the guy at the shop had a temp gun as told me it was running at 210'


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Old 07-19-2014, 09:11 AM   #13
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So, just ordered my clutch for the fan and I should have this done today...thank god I didn't throw the old fan out! Click image for larger version

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Old 07-19-2014, 03:36 PM   #14
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2500cfm may not be enough. I tried an electric fan on my stock sized aluminum radiator but it didn't move enough air at slower speeds. Went back to a mechanical fan with a spacer to get the fan about 1 inch away. Also using a water pump that has high flow at low rpm's and a water additive. Water wetter or something like that. Looks good. Good luck
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Old 07-20-2014, 03:02 PM   #15
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Thanks, so I got 2 options now. The easiest would be a stronger fan and the clutch fan. Electric, I got a used M5 BMW fan that we had lying around that I'll try and then the clutch fan kit that I also picked up....I'll let you guys know how it went.


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Old 07-21-2014, 07:35 AM   #16
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Does anyone know if you reverse a puller fan and turn it into a pusher fan?


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Old 07-21-2014, 08:52 AM   #17
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Yeah if you switch the leads it will spin the other way. Usually black is negative, but mine when I first hooked it up (black neg, blue pos), it was spinning as a pusher not a puller.

If you take a piece of paper and hold it to the front of the rad with the fan on, it should be sucked and held to the radiator - there will also be a noticeable difference in the air blowing into the engine bay.
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Old 07-21-2014, 08:54 AM   #18
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So you can use a fan as a pusher but I have heard that they are less efficient.
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Old 07-21-2014, 08:55 AM   #19
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Nice! I was thinking about doing a dual install....meaning, taking my fan and placing it in front of the rad as a pusher and installing also the clutch fan. What do you guys think about that?


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Old 07-21-2014, 11:46 AM   #20
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I think you're fighting two issues. First - Stock radiator, you may need to bump up to an aluminum or a 4 row or both. Second - The UD pulleys is reducing the flow of your water pump and circulation. Since you are good at highway speeds, you should be able to bump up your electric fans to maybe dual 2,500 cfm. You also have to consider that your alternator is turning at a slower rate and it's possible the dual fans could have a small effect on electrical. I don't know what effect a push pull system will have when they may probably have different cfm's. The lower cfm fan could hamper the higher cfm fan, not sure though.
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Old 07-21-2014, 11:56 AM   #21
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Never thought of it that way. I had my suspicions about the ud pulleys slowing down the pump but I'll try the stronger BMW fan today and see if that works and then I'll do just the clutch fan. I also looked as some prices for that 4 row alum.rad. Probably my best bet I think.


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Old 07-21-2014, 01:55 PM   #22
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Quote:
Originally Posted by Aggiesrok View Post
I think you're fighting two issues. First - Stock radiator, you may need to bump up to an aluminum or a 4 row or both. Second - The UD pulleys is reducing the flow of your water pump and circulation. Since you are good at highway speeds, you should be able to bump up your electric fans to maybe dual 2,500 cfm. You also have to consider that your alternator is turning at a slower rate and it's possible the dual fans could have a small effect on electrical. I don't know what effect a push pull system will have when they may probably have different cfm's. The lower cfm fan could hamper the higher cfm fan, not sure though.

Good point on the UD pulleys and lower voltage at lower speeds. Might not be enough current to keep the fan going fast enough.
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Old 07-21-2014, 02:38 PM   #23
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To tell you the truth my fan in my opinion felt like it was pulling good, but I guess it wasn't enough. I just tried the BMW M5 fan and it's much stronger. Because of clearance issues it's gonna have to sit in front as a pusher. I'll try the combo pusher and clutch fan idea I had. I'll post some pics and info.



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Old 07-29-2014, 09:03 AM   #24
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I know it sounds dumb but are you sure the thermostat is facing the right direction? I swapped one out on a 302 years ago and put it in backwards which made it run hot. Girlfriend's dad had to point it out to me lol.
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Old 08-01-2014, 02:45 PM   #25
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Have you checked out the actual thermostat? I have had relatively new ones go bad.

Going back to my 289 days, I had the same problem you are describing. At highway speeds temp was fine, but a slower speeds in traffic, temp would build up. There was enough water getting by in the bypass and enough airflow thru the radiator to cool it enough. Slow down, not so much...
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Old 08-03-2014, 12:46 PM   #26
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The thermostat is facing the right way 100%. But for now I think I found the solution! I did the clutch fan and the pusher fan in front and she's staying steady at 180-190' and that's without the fan shroud. I still think I'm gonna change the rad this winter. A 4 row for sure.


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Old 08-03-2014, 05:42 PM   #27
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Originally Posted by BigpapaDean View Post
The thermostat is facing the right way 100%. But for now I think I found the solution! I did the clutch fan and the pusher fan in front and she's staying steady at 180-190' and that's without the fan shroud. I still think I'm gonna change the rad this winter. A 4 row for sure.


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Nice. Be sure to measure the width of the new rad before you order it to be sure you clear the water pulley!
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Old 08-04-2014, 11:41 AM   #28
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Ya I know! It's crazy tight in front. Thank god it worked out for now. At least I can enjoy the rest of the summer with the car. Maybe a roll cage at the end of the season....lol Click image for larger version

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