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07-29-2020, 03:09 PM | #21 |
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Re: New to the Flathead game and need advice
Just for information's sake, any oil with "50" as the last number of the weight has sufficient zinc for just about any need. For that reason, I run Mobil-1 10/50 in the hemi in my race car with an Engle roller cam.
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07-29-2020, 06:55 PM | #22 |
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Re: New to the Flathead game and need advice
Just something else to consider on your gear ratio is the size of your tires . They look to be a bunch shorter than what would be original . Take into account the diam. of current tires vs original. The ratio is stamped on the center housing .
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07-29-2020, 07:37 PM | #23 |
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Re: New to the Flathead game and need advice
I have been told that oil with any oil with "40" is the same deal. In fact, a noted YBlock engine builder uses Valvoline conventional 10-30 and 10-40 in all his engine builds as they have enough zinc.
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07-29-2020, 09:36 PM | #24 |
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Re: New to the Flathead game and need advice
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07-29-2020, 09:52 PM | #25 | |
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Re: New to the Flathead game and need advice
Quote:
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07-30-2020, 08:21 AM | #26 |
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Location: Alabama
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Re: New to the Flathead game and need advice
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07-30-2020, 08:28 AM | #27 |
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Re: New to the Flathead game and need advice
255 55 18 is approximately a 29" combo. That should be roughly equivalent to 6.50:16.
The 3.54 gears are a great swap into these old trucks, that's what I have in my 41. Mart. |
07-30-2020, 08:37 AM | #28 |
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Re: New to the Flathead game and need advice
mart you are speaking Greek to me. Lol I think if I am following you right. Stay with the tires I got and get the gearing ratio I found at speedway. I don’t understand the 6.50:16 and 29 combo you said. Sorry if that is a stupid question.
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07-30-2020, 09:00 AM | #29 |
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Re: New to the Flathead game and need advice
Rick, engine rpm, gear ratios and tire sizes are all related. The easiest way to reduce engine rpm is to increase tire size. In the rpm formula tire size is in diameter. Mart is giving you a tire size (the numbers on the side of the tire) that is equal to a 29 inch diameter tire.
Smaller tires will increase the engine rpm, larger diameter tires will reduce engine rpms. A 29 inch tire is a common diameter for these vehicles. You can play with the numbers and see what you like, here is the RPM formula: RPM = (MPH X Trans Ratio X Rear Axle Ratio X 336) / Tire Dia In high gear in a 1:1 ratio transmission the Trans Ratio is 1, so: RPM = (MPH X Rear Axle Ratio X 336) / Tire Dia Now on the question of destroying a flathead engine with RPM, most likely not going to happen. 4000 rpms is very doable by about any flathead. The MPH formula is: MPH = (RPM X Tire Dia) / (Rear Axle Ratio X 336) (4000 RPM X 29 inch Tire) / 4.11 Axle Ratio X 336) = MPH So, MPH = (116,000) / (1380.96) = 84 At 3000 RPM the MPH would be 63 At 2500 RPM it would be 52 MPH. Most people are not accustom to the sound of an engine running at higher RPMs because most modern engine are geared to run at lower RPMs. The design of the valve in head engine is very sturdy and the engine will be limited by the breathing capability of anything near stock engine. The engine is not going to be capable of high enough rpm to do any damage. Last edited by JSeery; 07-30-2020 at 09:29 AM. |
07-30-2020, 09:23 AM | #30 |
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Re: New to the Flathead game and need advice
Thanks, knew they were all related , never have worked the formula. I now understand the “29” and what it meant. Thank you
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07-30-2020, 09:24 AM | #31 |
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Join Date: Jul 2020
Location: Alabama
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Re: New to the Flathead game and need advice
Thanks, knew they were all related , never have worked the formula. I now understand the “29” and what it meant. Thank you
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07-30-2020, 09:58 AM | #32 |
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Re: New to the Flathead game and need advice
My pickup has 29" dia tires a 3:54 rear end and a T5 transmission. I love the T5's overdrive and it was basically a bolt in swap with the existing floor shift. There are adapters available for the banjo rear end that convert them to a open drive shaft so you can keep your existing rear end. I agree with JSeery about the sound. I finally installed a tach and found the RPM's to be much lower than I thought even though it seemed like the motor was really wound up. Post some photos of your truck please.
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07-30-2020, 11:03 AM | #33 |
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Re: New to the Flathead game and need advice
Yes sir, I will add some picture to my album soon. Having connection issues at the moment.
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07-30-2020, 11:20 AM | #34 |
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Re: New to the Flathead game and need advice
Deleted by Hoop
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"Remember that when it comes to intelligence, half of all of us are below average." Last edited by Hoop; 08-10-2020 at 10:04 AM. |
08-10-2020, 09:34 AM | #35 |
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Re: New to the Flathead game and need advice
So this is a follow up post and new question. Adjusted all the linkage on the clutch and checked out all the mounts related to the chatter question. Truck much much better. Thanks to all that helped. New question is about the oil. So I got lucus old motor oil with zinc 10w40. Oil pressure 40 psi when engine is cold. When it warms up to 180 temp. My oil pressure goes to 10 psi to 20 psi. The psi will increase when warm with higher RPMs but just sitting still will go back down to 10 psi. Do I need to run a heavier oil weight like a 20w50 during hotter days. Temp running well over 90 degrees on a daily basis in Alabama. Thanks for the help in advice.
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08-10-2020, 01:05 PM | #36 |
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Re: New to the Flathead game and need advice
The oil is fine, don't worry about it.
Mart. |
08-10-2020, 05:09 PM | #37 | |
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Re: New to the Flathead game and need advice
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08-10-2020, 06:36 PM | #38 |
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Re: New to the Flathead game and need advice
Thanks a lot guys, totally appreciate it
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