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Old 09-26-2015, 03:09 PM   #1
roert
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Default ratio and pinion

sorry my english i right with translation.
i have a 1936 coupe with 21 bolt engine.
i restord my car.
I would like to go a little faster.
would you give me 3.54:1 or 3.25:1 recommend. and much brings about in mph
thank Robert
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Old 09-26-2015, 03:14 PM   #2
petehoovie
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Default Re: ratio and pinion

The smaller the gear ratio, less torque but higher speed. I'd go with the 3:54 to 1 of the two you mention. I think 3:78 to 1 is the best overall ratio.
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Old 09-26-2015, 04:05 PM   #3
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Default Re: ratio and pinion

3:78 unless you are running on absolute flat ground and not in city stop and go traffic. 3:78 will put you up to 70 mph or so with a 221 basically stock engine.
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Old 09-26-2015, 04:53 PM   #4
johndee138
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Default Re: ratio and pinion

I will second the recommendation for the 3:78 gearing. Just did my 36 with it and am VERY happy. The stock gearing it came with (4:11) was fine for 1936 but not so satisfactory for 2015.
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Old 09-27-2015, 09:52 AM   #5
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Default Re: ratio and pinion

I used to have a 29 rdst pickup with a B motor and a Cook four port head. 7.50x16 on the rear. I ran 3.27 to 1. It was great. Guess a B has more torque than a flat head.

Tim
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Old 09-27-2015, 10:17 AM   #6
rotorwrench
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Default Re: ratio and pinion

Columbia overdrive would be better but 3.54:1 would get your top speed up a notch. It is harder for the engine to get it there though. The 3.78 is the best all around if you can't find the Columbia overdrive.
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Old 09-27-2015, 11:21 AM   #7
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Default Re: ratio and pinion

Hi Everyone, I had the same problem with my '36 with 21 stud engine. Original rear gear 4.11:1, top speed 55MPH. Replaced with 3.78:1, top speed over 70MPH.

I got a whole replacement rear end, supplied by CharlieNY here on the 'Barn. I've never personally had a rear apart and back together. I am very happy!

Using a translator:
Hallo allerseits , ich hatte das gleiche Problem mit meinem '36 mit 21 Bolzenmaschine . Original hinteren Gang 4,11 : 1, Höchstgeschwindigkeit 55 Stundenmeilen . 1 , Spitzengeschwindigkeit über 70 Stundenmeilen : mit 3,78 ersetzt.

Ich habe eine ganze Ersatz hinteren Ende durch CharlieNY auf der " Barn versorgt hier . Ich habe noch nie persönlich hatte eine Rück auseinander und wieder zusammen. Ich bin sehr glücklich!
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Old 09-27-2015, 11:28 AM   #8
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Default Re: ratio and pinion

Have a friend here in Sweden running a 36 Convertible 21 stud original engine,
3,25 and its slow/hard to get running he don't like it and it takes quite a lot of fuel tom, probably because all the hard work it have to do.

så 3,54 or 3,78 will probably be the best.
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Old 09-28-2015, 07:37 AM   #9
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Default Re: ratio and pinion

Very tangled,
If yours only went 55 mph with a 4.11, it was not running right. Should easily do 70 + mph.
3.78 is best.
Martin.
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Old 10-01-2015, 02:05 PM   #10
roert
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Default Re: ratio and pinion

thanks
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Old 10-01-2015, 03:54 PM   #11
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Default Re: ratio and pinion

Quote:
Originally Posted by qmdv View Post
I used to have a 29 rdst pickup with a B motor and a Cook four port head. 7.50x16 on the rear. I ran 3.27 to 1. It was great. Guess a B has more torque than a flat head.

Tim
a 29 r/p is a hell of a lot lighter than a 36 coupe.
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Old 10-01-2015, 04:53 PM   #12
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Default Re: ratio and pinion

If you need to drive at both city and hiway speeds, the best choice is an overdrive. Good Columbias are getting hard to find, and pricey, particularly for the early cars. I suggest you consider a Mitchell OD. I have an OD in my '47, and it gives the best of worlds: good power for starting out and hills, and comfortable cruising without over revving the engine. I have a 3:78 rear with a 30 percent reduction of engine speed when engaged.
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Old 10-01-2015, 09:34 PM   #13
qmdv
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Default Re: ratio and pinion

Quote:
Originally Posted by Bassman/NZ View Post
a 29 r/p is a hell of a lot lighter than a 36 coupe.
I am currently building a 32 highboy roadster. I have some 3.27 I was thinking of running with a 276 cu in flathead. should be OK. I think.

Tim
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Old 10-02-2015, 07:28 AM   #14
scooder
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Default Re: ratio and pinion

Tim,
It depends on what "drive" your after. I wouldn't go to 3.54, let alone 3.27! Do you want a hot rod or q highway loafer?
Martin.
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Old 10-04-2015, 01:25 PM   #15
roert
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Default Re: ratio and pinion

36 coupe
i think 3,78 is the best for me
thanks
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Old 10-04-2015, 01:46 PM   #16
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Default Re: ratio and pinion

If you have a original 1935-36 rearend you will have a hard time finding the correct 10 spline 3.54's. On my sedan I had to convert the driveshaft from 10 to 6 spline
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Old 10-05-2015, 09:08 AM   #17
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Default Re: ratio and pinion

Quote:
Originally Posted by scooder View Post
Tim,
It depends on what "drive" your after. I wouldn't go to 3.54, let alone 3.27! Do you want a hot rod or q highway loafer?
Martin.
Like Martin's comments, LOL. I prefer the 4.11 gears myself, but if you want higher gearing I wouldn't go above 3.78. I know a lot of people do, but unless you are driving on the highway all day long I don't know why you would want to. As others have stated if that is really the objective I would go with an overdrive, best of both worlds.
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Old 10-05-2015, 07:26 PM   #18
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Default Re: ratio and pinion

Not sure how much heavier a coupe is over a pickup but my little '37 21 stud turns over ok . 28 gearset, 3.78 rear and 7.50x16 tyres. in traffic every day no problems, don't even change out of top for some corners..
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