Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 07-29-2019, 06:48 PM   #1
Ritzy1
Senior Member
 
Ritzy1's Avatar
 
Join Date: Feb 2016
Location: Braintree, MA
Posts: 178
Default How hot is too hot?

So, I've got less than 500 miles on my freshly rebuilt 59A-B flathead. .040 over, Merc 4" stroke crank, Isky Max-1, dual Stromberg 97s w/.041 jets, 180 thermostats, shrouded electric fan with 185 switch, 4# cap, dipped radiator. Before yesterday, it had been staying around that 185 mark, even in hot weather at highway speeds (65 MPH/1,580 RPM). Yesterday though, it was about 90 and I was cruising along at 70 or so and 1,680-1,700 RPM and it started to get hot . . . 206-207. I pulled off the highway, and it immediately dropped down. I got back on the highway, and cruised at about 65, and it went back to the 185 range. My question is, should I be concerned at 206-207? If not, what's the temp I should be concerned at?

Last edited by Ritzy1; 07-30-2019 at 05:02 AM.
Ritzy1 is offline   Reply With Quote
Old 07-29-2019, 07:20 PM   #2
tubman
Senior Member
 
tubman's Avatar
 
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 5,123
Default Re: How hot is too hot?

I had a similar problem in an O/T engine I had rebuilt. The engine would overheat any time I let it sit and idle for any period of time. I was just getting ready to pull it and tear it down, but after about 800 miles, the problem went away. I can only figure the engine was built "tight", and with enough miles loosened up. Since your engine only overheats sporadically (and 206-207 ain't that hot), I'd give it a few more miles. The '51 Mercury in my '51 Ford runs consistently at about 180 (the thermostats) just about all the time. However, extended periods on the interstate at 70 and over pushes the temperature to 190.
tubman is online now   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-29-2019, 07:23 PM   #3
JSeery
Senior Member
 
JSeery's Avatar
 
Join Date: Nov 2012
Location: Wichita KS
Posts: 13,204
Default Re: How hot is too hot?

As long as it's not boiling over you should be ok.
JSeery is online now   Reply With Quote
Old 07-29-2019, 07:46 PM   #4
51 MERC-CT
Senior Member
 
51 MERC-CT's Avatar
 
Join Date: May 2010
Location: Hartford, Ct
Posts: 4,553
Default Re: How hot is too hot?

Quote:
Originally Posted by Ritzy1 View Post
So, I've got less than 500 miles on my freshly rebuilt 59A-B flathead. .040 over, Merc 4" stroke crank, Isky Max-1, dual Stromberg 97s w/.091 jets, 185 thermostats, electric fan with 185 switch, 4# cap, dipped radiator. Before yesterday, it had been staying around that 185 mark, even in hot weather at highway speeds (65 MPH/1,580 RPM). Yesterday though, it was about 90 and I was cruising along at 70 or so and 1,680-1,700 RPM and it started to get hot . . . 206-207. I pulled off the highway, and it immediately dropped down. I got back on the highway, and cruised at about 65, and it went back to the 185 range. My question is, should I be concerned at 206-207? If not, what's the temp I should be concerned at?
Heating problems aside and out of curiosity, just what transmission, differential and tire combination are you using to achieve (65 MPH/1,580 RPM)?
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES
51 MERC-CT is offline   Reply With Quote
Old 07-29-2019, 07:59 PM   #5
VeryTangled
Senior Member
 
VeryTangled's Avatar
 
Join Date: May 2010
Location: (Not far enough...) Outside of DC
Posts: 2,595
Default Re: How hot is too hot?

Trying to help. Water at sea level boils at 212, add 4 pounds of pressure, and at 3 degrees increase of boiling point for each pound of pressure, you get boil at 224. Eyhylene Glycol 50/50 changes these numbers up a little bit. Boiling makes pockets where there is no water contact with the metal among other issues.

I roll as JSeery suggests, if coolant is not coming out, it's not too hot. But I run much more stock stuff that the OP's rig.
__________________
-Jeff

Sorry I'm such a pill, but why not support the Early Ford V-8 Foundation Museum?

My avatar courtesy of 41ford1. Pic is him and Ol' Ron.

Last edited by VeryTangled; 07-29-2019 at 08:08 PM.
VeryTangled is offline   Reply With Quote
Old 07-29-2019, 09:32 PM   #6
WABOOM
Senior Member
 
WABOOM's Avatar
 
Join Date: Jun 2018
Location: Minneapolis Minnesota
Posts: 247
Default Re: How hot is too hot?

Short answer= 230 is too hot.
If you are cruising at 65 mph and can't stay below 210 something is wrong with your heat exchange. Most old cars have the opposite problem. Good temps at speed and heat up when stopped.
WABOOM is offline   Reply With Quote
Old 07-29-2019, 09:38 PM   #7
drolston
Senior Member
 
drolston's Avatar
 
Join Date: Jun 2014
Location: Williamsburg, VA
Posts: 891
Default Re: How hot is too hot?

Quote:
Originally Posted by 51 MERC-CT View Post
Heating problems aside and out of curiosity, just what transmission, differential and tire combination are you using to achieve (65 MPH/1,580 RPM)?
Sounds off by 1000 rpm for normal gearing and tire diameter.
And .091 jets in a 97 carb is way rich. Something off there too.
drolston is offline   Reply With Quote
Old 07-29-2019, 11:38 PM   #8
Tinker
Senior Member
 
Tinker's Avatar
 
Join Date: May 2010
Location: MN/FL
Posts: 5,007
Default Re: How hot is too hot?

What kind of capacity are you running as far as water volume?


My engine with Mitchell a 36z5 over od does at least 2 plus k at 70. cruising rpm.
Tinker is offline   Reply With Quote
Old 07-30-2019, 04:47 AM   #9
Ritzy1
Senior Member
 
Ritzy1's Avatar
 
Join Date: Feb 2016
Location: Braintree, MA
Posts: 178
Default Re: How hot is too hot?

Quote:
Originally Posted by 51 MERC-CT View Post
Heating problems aside and out of curiosity, just what transmission, differential and tire combination are you using to achieve (65 MPH/1,580 RPM)?


T-5 trans., 2.73-geared Ford 8.8, 235/65R16 tires. Thinking I may need to change to a 3.08 to get it more in the engine's power band on the highway.
Ritzy1 is offline   Reply With Quote
Old 07-30-2019, 04:47 AM   #10
Ritzy1
Senior Member
 
Ritzy1's Avatar
 
Join Date: Feb 2016
Location: Braintree, MA
Posts: 178
Default Re: How hot is too hot?

Quote:
Originally Posted by drolston View Post
Sounds off by 1000 rpm for normal gearing and tire diameter.
And .091 jets in a 97 carb is way rich. Something off there too.


Typo on jet size. Should have said .041.
Ritzy1 is offline   Reply With Quote
Old 07-30-2019, 04:57 AM   #11
Ritzy1
Senior Member
 
Ritzy1's Avatar
 
Join Date: Feb 2016
Location: Braintree, MA
Posts: 178
Default Re: How hot is too hot?

Thanks for all the replies. I'll just keep an eye on it. Trying to keep the RPMs varied as I break in the motor.
Ritzy1 is offline   Reply With Quote
Old 07-30-2019, 06:46 AM   #12
51 MERC-CT
Senior Member
 
51 MERC-CT's Avatar
 
Join Date: May 2010
Location: Hartford, Ct
Posts: 4,553
Default Re: How hot is too hot?

Quote:
Originally Posted by Ritzy1 View Post
T-5 trans., 2.73-geared Ford 8.8, 235/65R16 tires. Thinking I may need to change to a 3.08 to get it more in the engine's power band on the highway.
Sounds like a great and much coveted setup. The 3.08 should kick up the RPM by a few hundred.
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES

Last edited by 51 MERC-CT; 07-30-2019 at 10:22 AM.
51 MERC-CT is offline   Reply With Quote
Old 07-30-2019, 06:53 AM   #13
uncle max
Senior Member
 
uncle max's Avatar
 
Join Date: May 2010
Location: SLC Utah
Posts: 736
Default Re: How hot is too hot?

Quote:
Originally Posted by Ritzy1 View Post
Typo on jet size. Should have said .041.
Some .043's or .044's would absolutely cool it down.
__________________
RIP Tyler... My Son, Helper & Best Friend.
Feb '78 to Father's Day '10.
www.97-express.com ~ info@97-express.com
uncle max is offline   Reply With Quote
Old 07-30-2019, 09:50 AM   #14
Bored&Stroked
Senior Member
 
Bored&Stroked's Avatar
 
Join Date: Jan 2011
Location: Central Ohio
Posts: 2,313
Default Re: How hot is too hot?

I agree with Uncle Max - you are probably too lean on the jets - try .043 to .045s.

Also, you are correct on the rear-end ratio issue - you are nowhere near the RPM that you need to be - not enough torque to pull your final gear ratio.

Do your calculations (tire size, OD ratio, etc) - and get to at least 2200 RPM at 70 . . . I'd go a bit more 2300 - 2400. Right now, you're lugging the engine - which also isn't good for temperatures or anything else.
Bored&Stroked is offline   Reply With Quote
Old 07-30-2019, 11:01 AM   #15
flatjack9
Senior Member
 
flatjack9's Avatar
 
Join Date: May 2010
Location: Oshkosh, Wi
Posts: 3,490
Default Re: How hot is too hot?

i'm running about 2300 rpm at 70 mph. Get around 20 mpg on the highway.
flatjack9 is offline   Reply With Quote
Old 07-30-2019, 12:01 PM   #16
40cpe
Senior Member
 
40cpe's Avatar
 
Join Date: May 2010
Location: Star, MS
Posts: 3,392
Default Re: How hot is too hot?

Assuming 27" rear tires, the RPM calculator says that Ritzy1 should be turning about 2378rpm at 70 in 4th gear (1:1 ratio). That would be an option to check the operation and temperature at normal RPMs.
40cpe is online now   Reply With Quote
Old 07-30-2019, 01:43 PM   #17
oldford2
Senior Member
 
oldford2's Avatar
 
Join Date: May 2010
Location: pittsfield, MA
Posts: 1,939
Default Re: How hot is too hot?

Quote:
Originally Posted by Ritzy1 View Post
So, I've got less than 500 miles on my freshly rebuilt 59A-B flathead. .040 over, Merc 4" stroke crank, Isky Max-1, dual Stromberg 97s w/.041 jets, 180 thermostats, shrouded electric fan with 185 switch, 4# cap, dipped radiator. Before yesterday, it had been staying around that 185 mark, even in hot weather at highway speeds (65 MPH/1,580 RPM). Yesterday though, it was about 90 and I was cruising along at 70 or so and 1,680-1,700 RPM and it started to get hot . . . 206-207. I pulled off the highway, and it immediately dropped down. I got back on the highway, and cruised at about 65, and it went back to the 185 range. My question is, should I be concerned at 206-207? If not, what's the temp I should be concerned at?

70 at 1700 rpm. What rear end do you have? Overdrive?
oldford2 is offline   Reply With Quote
Old 07-30-2019, 02:03 PM   #18
51 MERC-CT
Senior Member
 
51 MERC-CT's Avatar
 
Join Date: May 2010
Location: Hartford, Ct
Posts: 4,553
Default Re: How hot is too hot?

Quote:
Originally Posted by oldford2 View Post
70 at 1700 rpm. What rear end do you have? Overdrive?
See post #9 above--
"T-5 trans., 2.73-geared Ford 8.8, 235/65R16 tires."
__________________
DON'T RECALL DOING SOMETHING FOR MYSELF BASED ON SOMEONE ELSE'S LIKES OR DISLIKES
51 MERC-CT is offline   Reply With Quote
Old 07-30-2019, 02:39 PM   #19
WABOOM
Senior Member
 
WABOOM's Avatar
 
Join Date: Jun 2018
Location: Minneapolis Minnesota
Posts: 247
Default Re: How hot is too hot?

So the motor is loaded up and lugging?
WABOOM is offline   Reply With Quote
Old 07-30-2019, 05:37 PM   #20
drolston
Senior Member
 
drolston's Avatar
 
Join Date: Jun 2014
Location: Williamsburg, VA
Posts: 891
Default Re: How hot is too hot?

Quote:
Originally Posted by uncle max View Post
Some .043's or .044's would absolutely cool it down.
I have been fighting overheat at interstate speeds. Have 3 97's on progressive, all with .045 jets. Went to .048 on the center carb and that dropped cruise temp by about 10 degrees. At that speed, the secondaries are open, so they are getting .048 jets as well.
drolston is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 04:13 PM.