big block cooling issues
#1575263
02/07/14 03:12 AM
02/07/14 03:12 AM
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Joined: Mar 2009
Posts: 2,457 Sydney,Australia
tex013
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having problems with a 440 wedge just gets hotter etc .Have replaced blocked radiator with cross flow type , no change . Waterpump , iron curved impellor fittel paddle type , no change .Thermostat or not , no change . I recall there was a guy here who plugged or reduced the size of the bypass port in the waterpump housing . Am I correct ? It does have a aluminium housing Motoris a bit of an unknown , maybe 11:1 , eddy heads . Does only have 17deg BTDC , probly a bit low but should not be that far off , may need 20
Thoughts , Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: big block cooling issues
[Re: Jeremiah]
#1575265
02/07/14 03:44 AM
02/07/14 03:44 AM
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Joined: Mar 2009
Posts: 2,457 Sydney,Australia
tex013
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Jeremiah, the housing is my next move . timing is initial big electric fan 1050 dominator running a bit rich there is about 35degree F drop across the radiator but at tstat is 230-240 thanks
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: big block cooling issues
[Re: Gabby63]
#1575268
02/07/14 05:07 AM
02/07/14 05:07 AM
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Joined: Jun 2006
Posts: 5,155 CT
GTX MATT
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That initial timing is likely sufficient, but you could try more it wont hurt. It sounds like a more radical build so it may even like it. If you've got vacuum advance you can just hook it to manifold vacuum to test it easier.
Now I need to pin those needles, got to feel that heat Hear my motor screamin while I'm tearin up the street
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Re: big block cooling issues
[Re: tex013]
#1575269
02/07/14 10:44 AM
02/07/14 10:44 AM
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Joined: Jan 2003
Posts: 13,319 Marion, South Carolina [><]
an8sec70cuda
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Tap the bypass hole in the housing underneath the thermostat w/ an NPT tap and install a plug...then drill a 1/8" hole through the plug. It's been so long since I did it I can't remember if it was 1/4 or 3/8 NPT.
This helped dropped the temp 5-10 degrees if I recall correctly.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: big block cooling issues
[Re: tex013]
#1575270
02/07/14 02:39 PM
02/07/14 02:39 PM
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Posts: 52,972 Romeo MI
MR_P_BODY
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How long of time are you talking here... from a cold engine up to 240... if its a short time I would think its not flowing water
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Re: big block cooling issues
[Re: tex013]
#1575271
02/07/14 05:40 PM
02/07/14 05:40 PM
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Quote:
having problems with a 440 wedge just gets hotter etc .Have replaced blocked radiator with cross flow type , no change . Waterpump , iron curved impellor fittel paddle type , no change .Thermostat or not , no change . I recall there was a guy here who plugged or reduced the size of the bypass port in the waterpump housing . Am I correct ? It does have a aluminium housing Motoris a bit of an unknown , maybe 11:1 , eddy heads . Does only have 17deg BTDC , probly a bit low but should not be that far off , may need 20
Thoughts , Tex
If good at cruise, but over heats at idle / not moving enough air over the rad. Other way, not enough rad or coolant flow problem. Most filled blocks don't have a coolant problem. They got higher oil temps - unless the block is 100% filled.
Fastest 300
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Re: big block cooling issues
[Re: tex013]
#1575272
02/07/14 05:46 PM
02/07/14 05:46 PM
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Joined: Jul 2004
Posts: 19,317 State of confusion
Thumperdart
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Quote:
having problems with a 440 wedge just gets hotter etc .Have replaced blocked radiator with cross flow type , no change . Waterpump , iron curved impellor fittel paddle type , no change .Thermostat or not , no change . I recall there was a guy here who plugged or reduced the size of the bypass port in the waterpump housing . Am I correct ? It does have a aluminium housing Motoris a bit of an unknown , maybe 11:1 , eddy heads . Does only have 17deg BTDC , probly a bit low but should not be that far off , may need 20 Thoughts , Tex
Which fan are you runnin............
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: big block cooling issues
[Re: rickraw]
#1575274
02/09/14 06:49 PM
02/09/14 06:49 PM
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Joined: Mar 2009
Posts: 2,457 Sydney,Australia
tex013
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guys, it just gets HOT . you drive around the block at work it will go 230/240 the $64 question is I hope there is no filler . thanks for coming on with the housing plug - didn't think I dreamed that. Monday morning now - back into it
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: big block cooling issues
[Re: tex013]
#1575276
02/09/14 10:11 PM
02/09/14 10:11 PM
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Joined: Jan 2003
Posts: 15,197 Omaha Ne
TJP
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Pull the cap and see if it's moving coolant, years ago had a big block that constantly overheated, Pulled the water pump and the impeller was laying in the housing, HMM wonder why it was getting hot. Start with the basics and collect data, analyze and report back. if it's getting that hot after a drive around the block the problem should be readily apparent, IE: stuck thermostat, plugged radiator, collapsing intake hose, plugged radiator hose (think shop rag, incorrect fan, incorrect pulley ratios, extremely lean etc. Collect the data, keep it simple and report back
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Re: big block cooling issues
[Re: tex013]
#1575277
02/09/14 10:30 PM
02/09/14 10:30 PM
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Joined: Dec 2004
Posts: 10,550 Rittman Ohio
fourgearsavoy
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Are your pulleys correct? I had some cooling problems of my own for a while until I put the factory pulleys on and a proper clutch fan. I wasn't moving the water fast enough through the cooling system with a "drag race" type cooling system.My car was going up to 230 with no signs of cooling down until I put a stock system on it and all was well Gus
64 Plymouth Savoy 493 Indy EZ's by Nick at Compu-Flow 5-Speed Richmond faceplate Liberty box Dana 60
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Re: big block cooling issues
[Re: fourgearsavoy]
#1575278
02/09/14 11:23 PM
02/09/14 11:23 PM
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Joined: Aug 2003
Posts: 12,291 Kent, Wa
340SHORTY
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What brand of water pump housing do you have? I hear the 440source housing have small passages and are very restrictive..
I am truckless..
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Re: big block cooling issues
[Re: bonefish]
#1575281
02/10/14 12:16 PM
02/10/14 12:16 PM
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Joined: Mar 2008
Posts: 5,746 Ontario, Canada
Dodgem
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Pull the thermostat and fill block from there may be a vapour lock? Fan blades on right way around? don't laugh I've seen it! Check the timing mark is right on the balancer (use a piston stop) and the timing to 36 total no vacuum advance hooked up at this point.
Last edited by Dodgem; 02/10/14 12:20 PM.
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Re: big block cooling issues
[Re: Dodgem]
#1575282
02/10/14 06:54 PM
02/10/14 06:54 PM
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Joined: Mar 2009
Posts: 2,457 Sydney,Australia
tex013
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Hi, cooling fan is 16" electric blowing the correct way , pull type. no thermostat . fitted factory iron housing , had aluminium with way smaller intake ports . restricted bypass in housing . raised rear of bonnet to release air better , no gain though after driving and with motor idling 225temp opened bonnet and temp dropped to 205 . tried 2 waterpumps , 1 had curved fins - 1 had pressed metal paddles . pulleys appear stock steel , 6 3/4" crank similar size on pump . I do have a slightly smaller pump pulley , maybe 1/4" . when you pull the cap on rad you can see water flowing I can open up the hole under the hemi style scoop if need be . I can try a 7 blade fixed fan though I have no shroud to suit . I will check timing though it does have TCI rattler thanks again ,
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: big block cooling issues
[Re: Jerry]
#1575285
02/10/14 07:34 PM
02/10/14 07:34 PM
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Joined: Mar 2009
Posts: 2,457 Sydney,Australia
tex013
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Jerry, balancer is pretty close 17BTDC bit low but not too far off probly needs 20 . Plugs are black , I know it is running rich , has a 1050 dom which is an old crap one no ability to fit a power valve Fan it does pull noticeable temp out top tank to bottom , 195/140 with fan on I was told motor was built by Ed Miller Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: big block cooling issues
[Re: RapidRobert]
#1575287
02/10/14 08:53 PM
02/10/14 08:53 PM
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Joined: Jan 2003
Posts: 15,197 Omaha Ne
TJP
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you are saying you have good flow, and a good temp drop across the radiator but are still running warm How are you measuring your temperature IE: what type of gauge, mechanical ,electrical etc. and where are the sending units located. I do not trust gauges until I have verified their accuracy. I DO NOT TRUST GAUGES UNTIL I HAVE VERIFIED THEIR ACCURACY. I use a digital thermocouple meter with probes that can be placed in multiple locations to do so Once the probes are in place I will compare the gauge readings to the meter. First test At IDLE. Write both the gauge and meter readings down from a cold start. How long does it take to warm up and at what temps does the fan turn on. Does the temp start dropping shortly after the fan turns on???? Second test: repeat the above tests while driving the vehicle short distances. If the temp increases abnormally while driving it, you either have to small or a blocked radiator, restriction in the system somewhere, (Do you have a spring inside the lower hose to keep it from collapsing IE: sucking shut as the rpms increase.) lack of airflow to the radiator, air going around rather than through the radiator or worst case an overfilled block. Do be aware that the thermostat also serves as a restrictor to keep the coolant in the radiator longer to exchange the heat and removing it can cause heating issues. One can substitute a large washer or gut the thermostat. FYI I have seen more than one aftermarket gauge be off by as much as 60 degrees at 200. It seems as though the warmer the temp is the farther out of whack a bad gauge /sending unit will go. keep us posted
Last edited by TJP; 02/10/14 09:02 PM.
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Re: big block cooling issues
[Re: tex013]
#1575290
02/10/14 10:43 PM
02/10/14 10:43 PM
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Joined: Jun 2008
Posts: 768 Maryville tn
67coronetman
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Use a clutch fan setup & a shroud and a good stat...
Old car are me......
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Re: big block cooling issues
[Re: 67coronetman]
#1575291
02/12/14 02:31 AM
02/12/14 02:31 AM
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Joined: Mar 2009
Posts: 2,457 Sydney,Australia
tex013
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ok , well now I am getting somewhere . As a last try I fitted a 18" fixed 7 blade fan with no shroud . It ran 170-185 , go figure.Not the ideal combination but can be worked on , not keen on running this combo at the strip . I did try a 20" clutch fan , no shroud ran closer to 200 .May end up like my Satellite , 5 blade clutch fan with some sort of shroud with a 12" pusher fan with manual control .May also open up the bonnet under the hemi scoop to allow more heat out like my six pack bonnet .Oh I also refitted the aluminium housing and pump, no difference . Now to run it more than 15-20 minutes on the street thanks again ,
Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: big block cooling issues
[Re: RapidRobert]
#1575293
02/12/14 07:43 AM
02/12/14 07:43 AM
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Joined: Mar 2009
Posts: 2,457 Sydney,Australia
tex013
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Just the local streets ,and industrial area Just suprised a big electric fan that covered over half the new radiayor core wouldn't cool like an unshrouded fan 4" off the core . Especially with the original core being partially blocked. Tex
New best ET 10.259@129.65 . New best MPH 130.32 Finally fitted a solid cam, stepped it up a bit more 3690lbs through the mufflers New World block 3780lbs 10.278@130.80 . Wowser 10.253@130.24 footbraking from 1500rpm Power by Tex's Automotive
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Re: big block cooling issues
[Re: tex013]
#1575294
02/12/14 09:17 AM
02/12/14 09:17 AM
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Joined: Jan 2003
Posts: 1,788 Greer, SC
TooMany62s
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It seems the pursuit of a cooling system that works better than what the factory had continues, with no success. Even un-shrouded a factory fan is pulling some air over the entire surface of the radiator. An electric fan, with no shroud, or one that covers only 50% of the radiator is only pulling air over 50% of the radiator surface.
Last edited by TooMany62s; 02/12/14 09:29 AM.
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