Ural 750 RPM Chart - Speed and RPM

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Manscout
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Ural 750 RPM Chart - Speed and RPM

Post by Manscout » Sat Jul 01, 2017 1:45 pm

Capture.JPG
You can view the actual spreadsheet here:
https://docs.google.com/spreadsheets/d/ ... sp=sharing
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Re: Ural 750 RPM Chart - Speed and RPM

Post by EncoreJoe » Wed Oct 18, 2017 2:06 pm

Thanks for the information.

I live mostly in 3rd gear and at 50 mph it feels like it's time to go into 4th.

It looks like 65 should be normal top speed but I usually stay at 60.



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Re: Ural 750 RPM Chart - Speed and RPM

Post by tx2sturgis » Wed Oct 18, 2017 2:14 pm

Cool!

Now can you make one for the 3.89 gears and 18 inch wheels?

I can measure total tire diameter or circumference if needed.
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Re: Ural 750 RPM Chart - Speed and RPM

Post by Manscout » Wed Oct 18, 2017 3:22 pm

tx2sturgis wrote:Cool!

Now can you make one for the 3.89 gears and 18 inch wheels?

I can measure total tire diameter or circumference if needed.
I am horrible at math. Lol. What I had to do was run all those speeds and remember the RPM. Then stop, and record the RPM. Then move up the range. I checked each one three times.
Sounds like I need to get an M70 to record the 18". :wink:
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Re: Ural 750 RPM Chart - Speed and RPM

Post by Tomcatfixer » Wed Oct 18, 2017 7:31 pm

I have a cT with a tachometer and the optional 3.89:1 ratio final drive gearing installed, so I guess I could help make such a chart, but in the meantime Tex, you can read through this thread: http://www.sovietsteeds.com/forums/view ... ilit=Drive

EDIT - Corrected autocorrect
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Re: Ural 750 RPM Chart - Speed and RPM

Post by Speedbump » Wed Oct 18, 2017 8:23 pm

My 2015 Retro with stock (4.62:1) gears and 18 inch wheels turns 4370 RPM at 60 MPH with induction tach. I too will try to do some recording of each gear's range this weekend.
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Re: Ural 750 RPM Chart - Speed and RPM

Post by wooden nickel » Wed Oct 18, 2017 8:43 pm

According to that, you have a rolling circumference of almost exactly 67". A person should be able to populate a chart with that once they know the gear ratios of the tranny and I think the mothership list those.
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Re: Ural 750 RPM Chart - Speed and RPM

Post by tx2sturgis » Wed Oct 18, 2017 9:39 pm

Manscout wrote: I am horrible at math. Lol. What I had to do was run all those speeds and remember the RPM. Then stop, and record the RPM. Then move up the range. I checked each one three times.
Sounds like I need to get an M70 to record the 18". :wink:
And here I thought that was your google doc and you could just punch in a few numbers....

I think someone did all this 'figgerin' a few years ago, and its probably buried in the archives.
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Re: Ural 750 RPM Chart - Speed and RPM

Post by fallalotesq » Wed Oct 18, 2017 9:52 pm

Okay, probably a stupid question but how do you determine the gear ratios?
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Re: Ural 750 RPM Chart - Speed and RPM

Post by wooden nickel » Wed Oct 18, 2017 10:23 pm

If I did the chart numbers right, it looks like 1st 3 : 1, 2nd 1.9 : 1, 3rd 1.3 : 1, assuming 4th is 1 : 1.
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Re: Ural 750 RPM Chart - Speed and RPM

Post by tx2sturgis » Wed Oct 18, 2017 10:56 pm

I found a listing in the Owners Manual for my Solo, I assume it's the same for the sidecar models.


Of course the final drive ratio is 3.89 on the Solo:
Inkedural-specs_LI.jpg
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Re: Ural 750 RPM Chart - Speed and RPM

Post by wooden nickel » Thu Oct 19, 2017 4:59 am

Ah! That's what I get for assuming a 1 to 1 in fourth. I should have known that an offset output gearbox would use an odd number of teeth in fourth.
I knew I had seen the gear ratios in some tech specs. Didn't find them in a cursory scan.
That also means I was off in the tire circumference too. Now it figures to 79.7 inches. That sounds better.
If I had divided by Pi I might have noticed that meant we were running awfully low profile tires. :roll:
At least the short tire evened out the tall gearing and would still have given the right speed in the chart. Garbage in, almost right answer out. Who knew?
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Re: Ural 750 RPM Chart - Speed and RPM

Post by Manscout » Thu Oct 19, 2017 10:04 am

If someone get me the corresponding info for the other wheel sizes and ratio, I will add it into that document so they are all in one place and then add them here.
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Re: Ural 750 RPM Chart - Speed and RPM

Post by tx2sturgis » Thu Oct 19, 2017 11:06 am

I measured approximately 13.25 inches on my Solo, from center of axle to tread surface.

That should yield 83.21 inches for a circumference if I did that right. (13.25 x2, then x pi, 3.14)

Multiply 5280 feet in a mile by 12 inches, you get 63,360 feet in a mile.

Divide 83.21 into that and you get 761.4 wheel revs per minute at 60 mph.

Multiplying that by the 3.89 FD ratio, I get 2961.8 driveshaft revs per minute at 60 mph.

Then multiply that by 1.19, (4th gear) I get approximately 3524 rpm at 60 mph for my Solo sT.

I bet its pretty close!

My head hurts now.

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Re: Ural 750 RPM Chart - Speed and RPM

Post by Peter Pan » Thu Oct 19, 2017 12:55 pm

First post: Too low green rev range will hurt the engine fast! On STRONG slopes or when you need force indeed stay between 4500 and 5500 revs with a free engine for to get enough oil to the left cylinder too. Obviously with a new engine you need to babysit the engine and obey the bikes speed order.
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