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I have a ? what do i need
to do to my trannie to get
more speed and less scream
out of my engine? please help
any advise is good
Thanx
++++++++++
Hello Hippie Joe
I don't want to argue with the previous writer or doubt his word, but in my experience unless you have REALLY small tires and wheels, just going to a bigger wheel probably won't help. The rest of his advice is sound.
However, on my bus I went from 11:00X20 tires/wheels to 12:00x22.5 tires/wheels and experienced NO difference. Virtually no noticeable change in top end, engine RPM, etc. Before I had stood them up side by side and there wasn't half an inch of height difference anyway.
My opinion and the opionion of my friends is that you need to change hour rear end. And the other fella is right, you haven't given us enough info. What motor/tranny and current rear end are you running now? And waht size tires? THAT will lead to a more helpful discussion
See ya, and feel free to email me if hou can't get help from anyone else. Ilove buses!
Pat Young
WheelchairBusProject@juno.com
Tire Radius:
7.50X20 = 17.0 8X22.5 = 17.1
8.25X20 = 17.6 9X22.5 = 17.9
9.00X20 = 18.6 10X22.5 = 18.6
10.00X20 = 19.2 11X22.5 = 19.2
11.00X20 = 19.7 12X22.5 = 19.7
12.00X20 = 20.4
Tire Revolutins per mile:
7.50X20 = 568 8X22.5 = 563
8.25X20 = 549 9X22.5 = 543
9.00X20 = 520 10X22.5 = 529
10.00X20 = 504 11X22.5 = 501
11.00X20 = 487 12X22.5 = 487
12.00X20 = 470
Of course, these are generalizations/averages. Different manufacturers will make things differently so to make sure of your calculations you will need to measure your own tires.
As you can see on the chart, going from a 11.00X20 to a 12X22.5 is not a calculable difference.
I would agree the gentleman didn't experience a change by going to tubeless tires. If the gentleman had gone to a 12X24.5 he would have seen the same difference had he gone from a 9.00X20 to a 11X22.5 or a 10.00X20.
Changing the number of rotations a tire makes in a mile by 15 or 20 RPM's can make a significant difference.
Good luck and happy trails.
Mark O. |
RV and bus conversion info since 1996.
email Mark O.
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