Author Topic: Odd 426 crate Hemi problem, no heat  (Read 838 times)

Offline gyman98

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Odd 426 crate Hemi problem, no heat
« on: July 01, 2017 - 01:16:50 pm »
I have what seems to me as a odd problem with my crate 426 Hemi.  I can't get the coolant temp up,   I was around 160 while cruising so I switched the thermostat from the 160 the engine came with to a 180.  Still around 160.   Around town it might climb to 175 but drops back down to 155-160 on the highway.  70mph,  70-80 air temp.

26" rad,  dual fitech injection,  base timing about 15. 

Any suggestions?
1970 hemicuda convertible clone 426/727 3.23 8 3/4 suregrip




Offline 1 Wild R/T

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Re: Odd 426 crate Hemi problem, no heat
« Reply #1 on: July 01, 2017 - 01:45:33 pm »
Yeah, enjoy it... Good problem to have......  Whats the ambient temperature? Drive through my area, take a drive up the old Priest Grade & let me know how you do..... Last time I took a group up there it was 104 & two of the cars had to drop out....

https://www.youtube.com/watch?v=5arNwNWkWTM
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Offline 73440

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Re: Odd 426 crate Hemi problem, no heat
« Reply #2 on: July 01, 2017 - 03:16:42 pm »
Old Priest Grade sounds and looks like an interesting drive.

Immediately east of town, State Route 120 climbs from about 910 feet (280 m) AMSL elevation to about 2,450 feet (750 m) at Priest Station, California, over a distance of 4.5 miles (10 km). Old Priest Grade, a narrower road and predecessor to the current route of SR120, covers the same change in elevation over about 1.8 miles (2.9 km). It is common to see vehicles with smoking brakes descending the old grade. During summer, ambient temperatures can be in the 90~100 F range. In these temperatures, many vehicles overheat climbing the old grade. For this reason, bottles of water are available at turnouts along Old Priest Grade to fill overheating vehicles. A sign on Highway 120 also advises drivers to turn off air conditioning in order to prevent overheating while climbing either grade. Locals tell stories of car accidents in history where the vehicles left the path of Old Priest Grade and tumbled into Grizzly Gulch. The hillsides are sturdy chaparral with thick vegetation. The terrain was so difficult that, in a few cases, the cars and bodies were not retrieved, some locals claim.[citation needed] Construction to widen curves and add guard rails began in July 2010.[5]
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Offline 1 Wild R/T

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Re: Odd 426 crate Hemi problem, no heat
« Reply #3 on: July 01, 2017 - 03:35:20 pm »
Yup, if you like twisty grades it's a good one... If you don't.... Well lets just say a few of the people I go on cruises with have been less than thrilled.... Generally when heading up I give people the option of meeting us at the top......  Back in the 70's while working for Cal Fire I climbed the grade daily in a 67 Ford truck with a 6 cylinder & three on the tree..... Also descended the grade in the same old truck naturally with drum brakes all around.. Never a problem for me but I saw a few folks coming down run out of brakes & roll the stop at the bottom of the hill... Out onto the Highway... Luckily there wasn't nearly the traffic then that there is now....
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
5H21C  65 Falcon 2 dr Wagon... Dog Hauler...

Offline gyman98

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Re: Odd 426 crate Hemi problem, no heat
« Reply #4 on: July 01, 2017 - 04:50:56 pm »
Yeah, enjoy it... Good problem to have......  Whats the ambient temperature? Drive through my area, take a drive up the old Priest Grade & let me know how you do..... Last time I took a group up there it was 104 & two of the cars had to drop out....

https://www.youtube.com/watch?v=5arNwNWkWTM

Ambient temp has been about 70-80.  Next week temps are supposed to 90-105 but that isn't something that happens all the time here. 

The problem is my fitech won't go into its final tuning chart until the engine is above 170. 
1970 hemicuda convertible clone 426/727 3.23 8 3/4 suregrip

Offline cudabob496

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Re: Odd 426 crate Hemi problem, no heat
« Reply #5 on: July 01, 2017 - 06:41:25 pm »
gauge broke
test in boiling water
72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline cudabob496

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72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

Offline 1 Wild R/T

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Re: Odd 426 crate Hemi problem, no heat
« Reply #7 on: July 01, 2017 - 07:10:44 pm »
With the FiTech you can read the engine temp on the hand held controller..

JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
5H21C  65 Falcon 2 dr Wagon... Dog Hauler...

Offline 734406pk

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Re: Odd 426 crate Hemi problem, no heat
« Reply #8 on: July 01, 2017 - 09:46:14 pm »
Where do you have the sensor installed on your water pump housing?
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
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Offline gyman98

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Re: Odd 426 crate Hemi problem, no heat
« Reply #9 on: July 01, 2017 - 10:16:37 pm »
Where do you have the sensor installed on your water pump housing?

The fitech sensor is just to the (car) right of the t stat housing.  I would post up a picture if Photobucket hadn't pulled the plug on that
1970 hemicuda convertible clone 426/727 3.23 8 3/4 suregrip

Offline gyman98

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Re: Odd 426 crate Hemi problem, no heat
« Reply #10 on: July 02, 2017 - 01:01:36 am »
Flickr comes through!
https://flic.kr/p/WgT3ao
1970 hemicuda convertible clone 426/727 3.23 8 3/4 suregrip

Offline 734406pk

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Re: Odd 426 crate Hemi problem, no heat
« Reply #11 on: July 02, 2017 - 10:44:22 am »
That's the right spot!  :iagree: double check your temp reading with a IR temp gun. Do you have a thermo-clutch fan?
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive

Offline gyman98

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Re: Odd 426 crate Hemi problem, no heat
« Reply #12 on: July 02, 2017 - 12:24:23 pm »
That's the right spot!  :iagree: double check your temp reading with a IR temp gun. Do you have a thermo-clutch fan?

I'll double check although I'm not sure how accurate my gun is.   I do have a clutch fan.  Thinking about taking it off to see if that helps and if it does go to electric and let the fitech control it
1970 hemicuda convertible clone 426/727 3.23 8 3/4 suregrip

Offline 734406pk

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Re: Odd 426 crate Hemi problem, no heat
« Reply #13 on: July 02, 2017 - 01:29:39 pm »
"Thinking about taking it off to see if that helps and if it does go to electric and let the fitech control it"

That's a good idea! The fan clutch might be stuck "on".
1973 Challenger 440 6 pack auto 3.91 rear
2012 Dodge Ram 3500 dually 6.7 Cummins Fleece EFI Live
1973 Challenger 318 2bbl auto 2.73 rear 22.5 mpg RIP
1970 Challenger TA 340 4bbl auto-Sold and sad
1999 Dodge Ram 3500 dually 5.9 Cummins Fleece tuned VGT-sold
1995 Kawasaki ZX1100E & still alive

Offline 1 Wild R/T

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Re: Odd 426 crate Hemi problem, no heat
« Reply #14 on: July 02, 2017 - 01:36:04 pm »
"Thinking about taking it off to see if that helps and if it does go to electric and let the fitech control it"

That's a good idea! The fan clutch might be stuck "on".

Yeah, but with a 180 thermostat the fan can be blowing all the air it wants, the engine should warm up to 180..... I'd try another thermostat....  :2cents:
JS27N0B 70 Challenger R/T Convertible  FJ5 Sublime, Show Poodle w/90,000 miles since resto
WS27L8G 68 Coronet R/T Convertible  PP1 Bright Red, Project
RM21H9E 69 Road Runner Coupe R4 Performance Red, Sold...
5H21C  65 Falcon 2 dr Wagon... Dog Hauler...