Previous Thread
Next Thread
Print Thread
Page 2 of 2 1 2
Re: big block cooling issues [Re: tex013] #1575283
02/10/14 07:00 PM
02/10/14 07:00 PM
Joined: Jan 2003
Posts: 6,988
Warren, MI
J
Jerry Offline
master
Jerry  Offline
master
J

Joined: Jan 2003
Posts: 6,988
Warren, MI
I would start looking at your ignition and cam timing. what do the plugs look like? are you running way lean? a 16" fan maybe a little too small for a big block. might be better off with two 10" or two 12" fans


Superior Design Concepts
2574 Elliott Dr
Troy MI 48083
jerry@sdconcepts.com
www.sdconcepts.com
Facebook page: Superior Design Concepts
www.bcrproducts.com
Re: big block cooling issues [Re: tex013] #1575284
02/10/14 07:29 PM
02/10/14 07:29 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
Circle Track
Happy Birthday RapidRobert  Offline
Circle Track

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
Quote:

cooling fan is 16" electric. 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.


My you need more airflow. A good properly spaced clutch fan/shroud will pull a tornado of air thru the rad. A smaller pump pulley will likely help tho how much I ain't sure.


live every 24 hour block of time like it's your last day on earth
Re: big block cooling issues [Re: Jerry] #1575285
02/10/14 07:34 PM
02/10/14 07:34 PM
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
tex013 Offline OP
top fuel
tex013  Offline OP
top fuel

Joined: Mar 2009
Posts: 2,457
Sydney,Australia
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
Re: big block cooling issues [Re: tex013] #1575286
02/10/14 07:37 PM
02/10/14 07:37 PM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
Circle Track
Happy Birthday RapidRobert  Offline
Circle Track

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
Quote:

Fan
it does pull noticeable temp out top tank to bottom , 195/140 with fan on


Correct, that is a pretty good drop


live every 24 hour block of time like it's your last day on earth
Re: big block cooling issues [Re: RapidRobert] #1575287
02/10/14 08:53 PM
02/10/14 08:53 PM
Joined: Jan 2003
Posts: 15,197
Omaha Ne
T
TJP Offline
I Live Here
TJP  Offline
I Live Here
T

Joined: Jan 2003
Posts: 15,197
Omaha Ne
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.
Re: big block cooling issues [Re: RapidRobert] #1575288
02/10/14 09:59 PM
02/10/14 09:59 PM
Joined: Feb 2005
Posts: 528
SW CO
HemiSportFury Offline
mopar
HemiSportFury  Offline
mopar

Joined: Feb 2005
Posts: 528
SW CO
Quote:

Quote:

Fan
it does pull noticeable temp out top tank to bottom , 195/140 with fan on


Correct, that is a pretty good drop




That's a good drop IF there is good water flow through the radiator. Low water flow will also show a good drop but not provide much cooling.


'64 Sport Fury, 528 Hemi, FiTech EFI, 4-speed, 4.10 Dana 60
'57 Belvedere 2dr sedan, current project in process
'19 Cherokee Trail Hawk Elite
'03 Ram 2500 CTD HO, 6-speed 214,000 miles and still going strong
Re: big block cooling issues [Re: tex013] #1575289
02/10/14 09:59 PM
02/10/14 09:59 PM
Joined: Jan 2003
Posts: 6,363
Abilene, Texas
F
fastmark Offline
master
fastmark  Offline
master
F

Joined: Jan 2003
Posts: 6,363
Abilene, Texas
Since the motor is unknown, I'll throw out what happened to me, twice. I bought a NOS 440 short block from Mopar in the eighties. Built a set of 906 heads and used it in a tow truck. It always got hot, 220 to 240 all the time. Vapor locked all the time.Gave up and put a 400 back in and it was fine. A buddy bought a block from the wrecking yard at the same time and we built a HP street motor using 906 heads. We could not keep it cool at all either, just like yours. We changed the block in his with a 70 440 and cured the problem. All the other parts were the same. I did some research and found out that motor home blocks cast in 76-78 had extra cooling holes down by the bottom of the cly and you MUST use the correct matching motor home heads or it will not circulate and over heat. I looked and both blocks had the cooling holes. The proper heads are just 452 heads but they have an extra hole that is drilled around the steam holes.I finally found some motor home heads and now that motor runs cool. They are the heads that run the small tapered head spark plugs lick a chevy. check the date of your block.

Re: big block cooling issues [Re: tex013] #1575290
02/10/14 10:43 PM
02/10/14 10:43 PM
Joined: Jun 2008
Posts: 768
Maryville tn
67coronetman Offline
super stock
67coronetman  Offline
super stock

Joined: Jun 2008
Posts: 768
Maryville tn
Use a clutch fan setup & a shroud and a good stat...


Old car are me......
Re: big block cooling issues [Re: 67coronetman] #1575291
02/12/14 02:31 AM
02/12/14 02:31 AM
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
tex013 Offline OP
top fuel
tex013  Offline OP
top fuel

Joined: Mar 2009
Posts: 2,457
Sydney,Australia
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
Re: big block cooling issues [Re: tex013] #1575292
02/12/14 02:53 AM
02/12/14 02:53 AM
Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
RapidRobert Offline
Circle Track
Happy Birthday RapidRobert  Offline
Circle Track

Joined: Nov 2003
Posts: 36,040
Lincoln Nebraska
Quote:

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


Progress . Was that stoplight to stoplight or out on the highway?


live every 24 hour block of time like it's your last day on earth
Re: big block cooling issues [Re: RapidRobert] #1575293
02/12/14 07:43 AM
02/12/14 07:43 AM
Joined: Mar 2009
Posts: 2,457
Sydney,Australia
tex013 Offline OP
top fuel
tex013  Offline OP
top fuel

Joined: Mar 2009
Posts: 2,457
Sydney,Australia
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
Re: big block cooling issues [Re: tex013] #1575294
02/12/14 09:17 AM
02/12/14 09:17 AM
Joined: Jan 2003
Posts: 1,788
Greer, SC
TooMany62s Offline
top fuel
TooMany62s  Offline
top fuel

Joined: Jan 2003
Posts: 1,788
Greer, SC
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.
Page 2 of 2 1 2






Powered by UBB.threads™ PHP Forum Software 7.7.1