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Old 07-30-2019, 07:37 PM   #21
Ritzy1
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Default Re: How hot is too hot?

Thanks again for all the feedback. As many of you know, these carbs come with .045 jets. Since I'm a rookie with flatheads, I consumed Vern Tardel's book How to Rebuild and Modify Ford Flathead V-8 Engines. That became my bible. In there, he recommended starting with .041 jets with a dual carb setup at sea level, which is what I did. When I first started it up, it went way hot, so I changed back to the .045 jets. After some tuning by John Freeman at Freeman's Garage (authorized Stromberg distributor), we decided to put the .041s back in. There may indeed be a happy medium (.043). Again, it's only been on the road for two weeks, so I'm still sorting. I do love how it cruises along effortlessly on a flat highway at low RPM in 5th, but I realize I've got to raise the RPM up for when I come to a hill. So far, I've just been dropping it down a gear if it starts to lug. I think I've yet to get it above 3,500 RPM in any gear.


40cpe, I'll test your equation when I take it for a spin later this week, and let you know the result.
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Old 07-30-2019, 09:33 PM   #22
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Default Re: How hot is too hot?

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Originally Posted by flatjack9 View Post
i'm running about 2300 rpm at 70 mph. Get around 20 mpg on the highway.
I have no overheating problem cus I just got the engine fired up. But in a 32 Roadster with 281cu in 59AB and 3.27 rear end gears I calculate 2700 RPM at 70. Is that to many RPMs. Tires are 28 1/2 diameter
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Old 07-30-2019, 09:44 PM   #23
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Default Re: How hot is too hot?

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I have no overheating problem cus I just got the engine fired up. But in a 32 Roadster with 281cu in 59AB and 3.27 rear end gears I calculate 2700 RPM at 70. Is that to many RPMs. Tires are 28 1/2 diameter
Just depends on the rpm range you are comfortable with. I like to keep the engine in a bit higher rpm range myself, other do not. It also depends on the cam you are running. I like a longer duration higher lift cam, there for the higher rpm range.
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Old 07-31-2019, 09:22 AM   #24
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Default Re: How hot is too hot?

Thats why Model Ts have no temp gauge !!! LOL
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Old 07-31-2019, 11:41 AM   #25
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Default Re: How hot is too hot?

I don't think it's too hot, YET! like tosee cruise RPM around 2400 with a Max#1 cam. Enjoy the ride.
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Old 07-31-2019, 12:48 PM   #26
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Default Re: How hot is too hot?

Running that trans./rear end gearing you may be lugging. I'm running the same overdrive trans. with 3.25 gearing and 235/70/15 tires and at 65ish in 5th gear i'm at about 1900 +- rpm and I almost feel 3.40 gears are possibly more suited. With your gearing you may consider running in 4th gear. I am running the V8 Camaro 5 speed that has the 2.95 first gear so you may have to consider your first gear ratio for your decisions. As far as a final rpm probably 2100 to 2500 rpm is a good safe range. Some folks may dis agree.
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Old 07-31-2019, 06:41 PM   #27
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Default Re: How hot is too hot?

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I don't think it's too hot, YET! like tosee cruise RPM around 2400 with a Max#1 cam. Enjoy the ride.

Interesting to see you recommending 2,400, Ron. Putting this thing together, my mind was thinking low RPM at highway speeds like a modern car (1,800-2,200).

I was also surprised to see flatjack9 getting 20 MPG running 2,300 RPM.

This is how I learn. Great resources here! Thank you!

Tomorrow night when I get home I'll see what the RPM is in 4th @ 70 MPH.

Last edited by Ritzy1; 08-01-2019 at 06:08 AM.
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Old 07-31-2019, 10:11 PM   #28
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Default Re: How hot is too hot?

I also think the water pumps have allot to do with the temp. along with the radiator and condition of the block water jackets. Most modern radiators have a 7 LB cap. Yet some engines overheat. Flatheads do that????
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Old 07-31-2019, 11:05 PM   #29
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Default Re: How hot is too hot?

Just to keep this in this thread and not start another.


rpms.


Idle about 1000-1200
Running/cruising 2000 -2400
Max on a hop up 3,500-4,000


???


.
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Old 07-31-2019, 11:51 PM   #30
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Default Re: How hot is too hot?

Do not pay attention until it starts to boil.
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Old 08-01-2019, 04:16 AM   #31
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Default Re: How hot is too hot?

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Originally Posted by Tinker View Post
Just to keep this in this thread and not start another.


rpms.


Idle about 1000-1200
Running/cruising 2000 -2400
Max on a hop up 3,500-4,000


???


.
This seems high. What cam are you running?

Last edited by tubman; 08-01-2019 at 10:55 AM. Reason: Can't spell.
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Old 08-01-2019, 09:48 AM   #32
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Default Re: How hot is too hot?

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Originally Posted by Tinker View Post
Just to keep this in this thread and not start another.


rpms.


Idle about 1000-1200
Running/cruising 2000 -2400
Max on a hop up 3,500-4,000


???
.
I like a fast idle, but that's way beyond a fast idle! Your halfway through the advance curve.
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Old 08-01-2019, 11:31 AM   #33
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Default Re: How hot is too hot?

I idle at 800 with my 39. I like the speed up a little because of the cam and the crank mounted fan.
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Old 08-01-2019, 02:40 PM   #34
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Default Re: How hot is too hot?

Mine seems to idle all over the place. It certainly doesn't like to idle when it's cold. If I try to hit the road too fast, it'll die when I come to a stop. Once it's warmed up it can range from 750-900. I need to check to make sure the throttle's not sticking somewhere.
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Old 08-01-2019, 02:52 PM   #35
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Default Re: How hot is too hot?

Is your temperature gauge accurate? You can boil a pot of water at sea level and it will be 212 degrees.

Charlie Stephens
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Old 08-01-2019, 03:31 PM   #36
Ritzy1
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Default Re: How hot is too hot?

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Is your temperature gauge accurate? You can boil a pot of water at sea level and it will be 212 degrees.

Charlie Stephens
Haven't tested it Charlie, but I also don't feel the need to. It's brand new Dakota Digital stuff, and when the fan kicks on using a separate thermostat control, the gauge is reading 185.
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Old 08-01-2019, 08:15 PM   #37
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Default Re: How hot is too hot?

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Originally Posted by 40cpe View Post
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.
Yup, 2,380 RPM @ 70 MPH in 4th. Right on. It did tick up to 205 on both heads again, but dropped fairly quickly when I slowed a bit. May need to fatten it up.
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Old 08-01-2019, 09:21 PM   #38
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Default Re: How hot is too hot?

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Originally Posted by Ritzy1 View Post
Yup, 2,380 RPM @ 70 MPH in 4th. Right on. It did tick up to 205 on both heads again, but dropped fairly quickly when I slowed a bit. May need to fatten it up.
What is your rear end ratio
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Old 08-01-2019, 09:31 PM   #39
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Default Re: How hot is too hot?

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Originally Posted by JSeery View Post
I like a fast idle, but that's way beyond a fast idle! Your halfway through the advance curve.

I probably idle at about 600-700, I'm guessing... Don't have a rpm on the car but have a rpm tester, never really tested, just by ear (guess I'll test it, i tune with vacuum). I do have a reground cam, it's a bit lumpy. Could use a bit more idle so it doesn't load up idling. I do run a vacuum gauge in my 36 full time, no rpm.


It was just a topic suggestion I made for discussion. Not what I run.

Last edited by Tinker; 08-01-2019 at 10:32 PM.
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Old 08-01-2019, 10:10 PM   #40
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Default Re: How hot is too hot?

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Originally Posted by Ritzy1 View Post
Mine seems to idle all over the place. It certainly doesn't like to idle when it's cold. If I try to hit the road too fast, it'll die when I come to a stop. Once it's warmed up it can range from 750-900. I need to check to make sure the throttle's not sticking somewhere.

Have you put a vacuum gauge on the car? How are the plug reads? Sounds to be too lean from that description. Possible float or fuel pressure. Just from your post above.

Last edited by Tinker; 08-01-2019 at 10:51 PM.
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