Re: types of shifting

["Dennis J." <djohn14296@xxxxxxxxx>]

Neal,
Dave's explanation for "power shifting" is right on, probably the
best ever to do it was Ronnie Sox, best hand to foot coordination I
have ever seen and heard.
I do not believe there is any exacting term for shifting without a
clutch. Synchronizing shifting would be a possible reference(?). As a
truck driver, we generally only use the clutch for starting and
stopping, all the other times we just match the next set of gears to
the RPMs of the engine, whether we are shifting up or down. It is
easier in a big truck
The biggest difference is that in big trucks(18 wheeler size), they
do not have synchronizers in there transmissions, which, believe it
or not makes it easier to shift without the clutch. Also helping big
trucks shift without the clutch, is that the diesel engine revs up
and down slower that a passenger vehicle. It can be done with
standard transmissions in passenger cars and trucks, but it has to be
more exacting with the RPMs, and if you off just a tad, you'll get
grinding. It also has to do with the way the gears are cut for each
type of transmission, big truck vs passenger vehicles.
It is also my understanding that some of the standard transmissions
built for race cars had the teeth of the gears angle a little
different to ease the shock and the meshing of the gears, when power
shifting.  
Hope all this makes sense to you...jm2cw....:-)
Dennis

neal zimmerman said: 

What kind of shifting do u call it when u dont use the clutch
between gears, but just drop it in at the right RPMs??
Is it bad for the tranny??
What exactly is "powershifting"???  same thing or something
different??

Dave Casey said:

"Powershifting" is when you don't lift your foot off the gas while
you clutch and shift.
Shifting without the clutch is not bad for the tranny as long as it
 doesn't grind. Otherwise, you're tearing up synchros and probably
the gears as well where the sliders engage.





      No direct un-apportioned tax confirmed by the US Supreme Court rulings in CHAS. C. STEWARD MACH. CO. v. DAVIS, 301 U.S. 548, 581-582(1937)     A government big enough to give you everything you want, is strong enough to take everything you have. Dennis        

   


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