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03-31-2015, 02:02 PM | #1 |
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Driving the Overdrive in gear all the time??
I have a touring engine with 21+K on it, ,drive almost daily and as a rule shift into overdrive at about 40-45 mph and continue up to about 55-60.....I'm wondering if it would affect the engine at all leaving it in overdrive all the time,. I have a mitchell with is as they call it a "gear splitter" ., Any thoughts from anyone?
mark
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03-31-2015, 02:29 PM | #2 |
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Re: Driving the Overdrive in gear all the time??
Mark
Not sure which OD you have, but with the Mitchell at 26%, I have left it in OD several times, and driven it around town. It does make all the gears taller, so you won't have to shift so quickly in each gear, but it will also effect your acceleration somewhat. I personally prefer to just use the OD normally, but I doubt there is a problem, as long as you do not lug it in any of the gears. Some of the other OD's are as much as 33%, and that would likely be too tall for normal driving. |
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03-31-2015, 02:45 PM | #3 | |
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Re: Driving the Overdrive in gear all the time??
Quote:
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03-31-2015, 02:56 PM | #4 |
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Re: Driving the Overdrive in gear all the time??
Doesn't hurt a thing on a Mitchell other than acceleration.
Ironically your final ratio is much higher than compared to the 3.27 ratio which some guys complain their engine won't pull the 3.27 ratio. When you figure the 3.78 ring & pinion with 26% (the amount of the overdrive) removed from that ratio, it puts you at around 2.8 final ratio. Makes you wonder doesn't it??? |
03-31-2015, 03:01 PM | #5 |
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Re: Driving the Overdrive in gear all the time??
Very interesting statement...it does and thank you
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03-31-2015, 03:22 PM | #6 | |
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Re: Driving the Overdrive in gear all the time??
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03-31-2015, 03:33 PM | #7 | |
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Re: Driving the Overdrive in gear all the time??
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04-01-2015, 05:29 AM | #8 |
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Re: Driving the Overdrive in gear all the time??
Brent, I get a final ratio of 3.00 when I divide 3.78 by 1.26.
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04-01-2015, 06:58 AM | #9 | |
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Re: Driving the Overdrive in gear all the time??
Quote:
When you're not driving in overdrive producing a 3.78 final ratio, you only have 74% of this number if the increase is 26%; therefore..... Multiply 3.78 x .74 = 2.8 Last edited by Al Mack; 04-01-2015 at 07:13 AM. |
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04-01-2015, 11:05 AM | #10 |
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Re: Driving the Overdrive in gear all the time??
Not having an overdrive :-( IMO would not listening to your motor,trans,od be the thing to do? Each and ever situation be different? Happy motor Happy life :-)
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04-01-2015, 11:42 AM | #11 |
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Re: Driving the Overdrive in gear all the time??
You would have to slip the clutch a little to get moving, so it would wear more than normal. I personally enjoy shifting.
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04-01-2015, 03:39 PM | #12 |
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Re: Driving the Overdrive in gear all the time??
I wouldn't recommend starting in first over unless I had 4:11 gears and then maybe not even then. I find second over handy when driving in traffic around town. When cruising I shift about 40 or 45. I'm please with the Mitchell.
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04-01-2015, 04:34 PM | #13 |
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Overdrive "All the time" ...carefull now...
Mark,
Even though your engine is well broken in, the concern I would have if you engaged the overdrive all the time is "lugging" the engine. I have a 26% Mitchell and standard rear end. (Love it!) If I am driving into a strong head wind or climbing a long incline, I drop out of overdrive. I typically only use overdrive when I reach road speed and want to decrease the engine rpm and noise. I rebuild engines and the one thing I make sure I say three times to any of my customers is: Don't lug the engine. I make a point of mentioning to them that I am saying it three times so they remember the importance of: Don't lug the engine. Need I say it the third time? Don't lug the engine. Good Day! Last edited by Dave in MN; 04-02-2015 at 08:00 AM. |
04-01-2015, 04:49 PM | #14 |
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Re: Driving the Overdrive in gear all the time??
Thanks everyone,,,just was curios as to what people thought... I never do keep it in overdrive all the time but thought it was an interesting topic to discuss.,. Thanks for the insight and hope to see many of you in Niagara..
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