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Rebuilt 430 Runs Hot

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  • Howard Prout
    replied
    Originally posted by Astrowing View Post
    Howard,

    Are you still happy with the flex fan and shroud on your 430 for cooling? By now you've been at least over 90F as it was that hot when I was up there in July.
    So far, so good, and we have had some temps in the high 90s. BUT, I didn't do any short start and stop trips or have it idle for any length of time. My guess is that it will overheat under those conditions. After thinking about it a bit more, my guess is that the AC condenser is limiting the air flow through the radiator. I cleaned it very thoroughy when I had the rad out so I know the air passages are not plugged but the fins are spaced quite close together which cold be blocking the air flow to some extent.
    Last edited by Howard Prout; August 2nd, 2011, 07:59 PM. Reason: addnl info

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  • Dakota Boy
    replied
    For what its worth, I've had good luck using Water Wetter coolant additive.

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  • Astrowing
    replied
    Howard,

    Are you still happy with the flex fan and shroud on your 430 for cooling? By now you've been at least over 90F as it was that hot when I was up there in July.

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  • YellowRose
    replied
    Rebuilt 430 Runs Hot

    No wonder it is so hot there! I forgot that you are in Iraq! I was about to call my younger brother who lives in Virginia to see how he was handling the heat! lol.. That comment about there not being much humidity should have reminded me that you are not presently at home. Thanks for jogging my memory cells! Stay safe, my friend and thank you for your service to our country! I am retired Air Force.

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  • Jimz Bird
    replied
    Norfolk is home.

    I am still playing in the desert just West of Baghdad.

    Plan to be home sometime in December.

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  • YellowRose
    replied
    Rebuilt 430 Runs Hot

    Geeez, Jim! I didn't realize the East Coast area was getting those kind of high temperatures now! When I saw that post come through email, I figured you had to be in Arizona! Then I brought up the Forum and see that you are in Virginia! We all might be in for a real scorcher this year!

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  • Jimz Bird
    replied
    Originally posted by YellowRose View Post
    Hey Howard! If ya wanna give your engine and cooling system a good test, come visit me! I can easily provide you with temperatures running in the high 90's to low 100's! We were at or pushing 100 again today. We are running 8-10 degrees above normal and have been for several weeks.
    Gee, nice to have it so cool there Ray. 8:30 AM now and 91. Yesterday 111 - today only up to 109 and tomorrow 113, BUT, low humidity.

    It will get REALLY HOT when Summer comes.

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  • YellowRose
    replied
    Rebuilt 430 Runs Hot

    Hey Howard! If ya wanna give your engine and cooling system a good test, come visit me! I can easily provide you with temperatures running in the high 90's to low 100's! We were at or pushing 100 again today. We are running 8-10 degrees above normal and have been for several weeks.

    As for the moaning you have heard from the flex fan, when running at 60mph or higher, I also hear it! But it is not my flex fan that I hear moaning! It is my wallet, as the gas goes galloping through that engine at those speeds and higher! Seriously, though, I do not hear any moaning sounds from my flex fan and that might be because I am in a hardtop. If I had a convertible, I might hear it. I wonder if byersmtrco hears that when he is driving with his top down? He has, as I recall, a flex fan on his Tbird also. Does anyone else who has a flex fan hear any moaning from it? Or, like me, is it your wallet you hear moaning at those speeds and higher? And guys....Please don't go there as to what else might be causing the "moans" that Howard is hearing!....
    Last edited by YellowRose; June 6th, 2011, 11:22 PM.

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  • Howard Prout
    replied
    So far, so good. We haven't had any really hot days so far but the engine temp has stayed where it should be. One of the side effects I hadn't expected from the flex fan was the moan - it is quite noticeable at above 2000 rpm or 60 mph. Probably more so for me as I have the convertible top down as much as possible.

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  • Howard Prout
    replied
    In addition to installing a new flex fan, I also had the top half of the fan shroud chrome plated. I also made a cover for the top of the radiator and had it chrome plated as well. If you look closely at the pictures, you can see the filler piece between the nose and the rad, then the rad cover and the the fan shroud.

    BTW, something I hadn't noticed when installing the new fan is how close it comes to hitting the expansion tank - as can be seen in the first picture. I knew from rotating the fan by hand after it was installed that it didn't hit anything but I didn't look at the clearance with the expansion tank. However it is a flex fan so as the engine speed increases the distance between the fan blades and the expansion tank will increase.
    Attached Files

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  • Howard Prout
    replied
    Originally posted by Howard Prout View Post
    One option I am thinking of trying something like a Flex-a-Lite 1818 seven blade fan, but at 2 3/8" deep, I'm not sure it will fit.
    I installed a Flex-a-Lite 1818 fan yesterday. The only problem was that it is deeper than the original fan and had to be set out from the engine about an extra 1/4". I used two washers for spacers. The first was a one inch diameter washer that went between the AC pulley and the original spacer. This washer had to have holes drilled to accomodate the fan bolts. The second washer was 5/8" and went between the original spacer and the new fan. This washer had to have notches made to accomodate the fan bolts. There is enough room between the fan and the rad and it fits well within the fan shroud. I also had to get four new 5/16" x 3" bolts to accomodate the extra depth. So now I'll have to wait six months until we get some 100 deg. F. weather to see if this provides enough cooling.
    Last edited by Howard Prout; January 12th, 2011, 06:09 AM.

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  • 63-4drpost
    replied
    old man with a BIG mouth

    OMG I remind myself of Jackie Gleason in the Honeymooners,, "I got a BIIG mouth!
    sorry for the stupid way i say things in my posts, just my off-beat form of humor. My wife seldom laughs at it anymore(my humor).Henry

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  • simplyconnected
    replied
    Originally posted by simplyconnected View Post
    ...If your engine speed is always at idle, consider using an undersized pulley. It will increase the pump speed and water flow.
    It will also make your fan rotate faster.

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  • simplyconnected
    replied
    Originally posted by scumdog View Post
    ... if no thermostat is needed why would car-makers ever bother to put them into just about every motor made for the last 60+ years ????
    If you live in Michigan, you would need one real badly. Remote Start installations are backed up three weeks, here. Without a thermostat, our engines would take forever to produce enough heat to deice the windshield, and the driver would be eternally cold. It's -6.6*C right now. Ask Jed how cold it gets by his place in Minnesota.

    Years ago, we got a complaint (from old folks) that full-sized Ford Crown Victoria's and Mercury Marquis's weren't getting hot fast enough. So, Ford ran the heater core inlet hose off the rear of the RH head on our 5.0L engines. That got warm water to the heater sooner, but the coolant never reached thermostat temp. That scheme didn't last long. On average, our cars take about 2.5 miles to come up to heat. - Dave

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  • Howard Prout
    replied
    Originally posted by tbird430 View Post
    I thought you already said earlier in this thread you had a six blade fan?

    "...I have a triple core radiator, a six blade fan and a fan shroud!"

    What is your base timing set at? Have you checked to make sure #1 piston at TDC gives you 0 degrees on your harmonic balancer? Does you vaccum advance on the distributer work?

    -Jon in TX.
    It seems I can't count consistently - I guess old age is taking its toll. I don't know why I thought I had a six blade fan - I don't. The original one was four blade. When I installed the AC, I went to a five blade fan. I have thought about a six blade fan before but never got around to buying one.

    Jon, to answer your other questions, the timing is set at about 6 deg BTDC - any more and it will ping. The harmonic balancer and crank are in synch and the vacuum advance works as it should. And to answer Dave's queations, the rad is free flowing and the block is clean.

    I wish I had used an infra-red gun to check the temperature gradient across the rad, as has been suggested a few times, before I took the system apart but it's too late for that on this go-round.

    The engine only overheats on hot humid days at low speeds - never a problem on the open road. On thinking back to when the problem first arose, I think it may have been after I installed the AC system. Although the condenser is clear of any debris, I now think that not enough air is getting through a low speed. So how can I increase air flow at low speed?

    One option I am thinking of trying something like a Flex-a-Lite 1818 seven blade fan, but at 2 3/8" deep, I'm not sure it will fit. Another option is using a thermostatically controlled auxillary electric fan. Or both. There isn't much room between the AC condenser and the grille so I don't know if it is possible to get one in there. Has anybody installed an electric auxillary fan on a 430 with AC? If so, what did you use?

    PS - it does seem rather odd to be discussing an overheating problem when the temperature outside is below freezing and it is snowing!
    Last edited by Howard Prout; January 6th, 2011, 09:23 PM. Reason: additions

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