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07-30-2019, 07:37 PM | #21 |
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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. |
07-30-2019, 09:33 PM | #22 |
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Re: How hot is too hot?
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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07-30-2019, 09:44 PM | #23 |
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Re: How hot is too hot?
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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07-31-2019, 09:22 AM | #24 |
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Re: How hot is too hot?
Thats why Model Ts have no temp gauge !!! LOL
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07-31-2019, 11:41 AM | #25 |
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Location: Chester Vt
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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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07-31-2019, 12:48 PM | #26 |
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Re: How hot is too hot?
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07-31-2019, 06:41 PM | #27 | |
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Re: How hot is too hot?
Quote:
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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07-31-2019, 10:11 PM | #28 |
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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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07-31-2019, 11:05 PM | #29 |
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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 ??? . |
07-31-2019, 11:51 PM | #30 |
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Location: Netherlands
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Re: How hot is too hot?
Do not pay attention until it starts to boil.
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08-01-2019, 04:16 AM | #31 |
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Location: Minnesota, Florida Keys
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Re: How hot is too hot?
This seems high. What cam are you running?
Last edited by tubman; 08-01-2019 at 10:55 AM. Reason: Can't spell. |
08-01-2019, 09:48 AM | #32 |
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Re: How hot is too hot?
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08-01-2019, 11:31 AM | #33 |
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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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08-01-2019, 02:40 PM | #34 |
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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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08-01-2019, 02:52 PM | #35 |
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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 |
08-01-2019, 03:31 PM | #36 |
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Re: How hot is too hot?
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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08-01-2019, 08:15 PM | #37 |
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Re: How hot is too hot?
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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08-01-2019, 09:21 PM | #38 |
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Re: How hot is too hot?
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08-01-2019, 09:31 PM | #39 | |
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Re: How hot is too hot?
Quote:
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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08-01-2019, 10:10 PM | #40 | |
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Re: How hot is too hot?
Quote:
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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