I had a Lamborghini 400 years back and it had a fully synchro on reverse as does my present day Espada. You can go into reverse with no drama or strong hand pressure while going forward and put those cars into reverse, let up the clutch and slow the car up then to a full back up. I believe all Lamborghini's had this feature. So strange and utterly cool. No find them to grind them. Very elegant shifting. Jeff Cobb On Jul 29, 2016, at 4:52 PM, Thomas Törnblom <tipo874@gmail.com> wrote:
The 60:s - 70:s Volvo and Scania trucks I drove during my military service (1974/1975) were all synchro mesh. The Volvos had a 4 speed range transmission (1-4/5-8) while the Scanias had a 5 speed split (5 lo/hi)
The 50:s terrain trucks were non synchro, and they had no power steering either.
I'm amazed if current US trucks are non synchro.
My manual shift Audi quattros had some type of synchro on reverse. I believe it was some mechanism that stopped the gears spinning when you put it in reverse, not a full synchro.
The gearbox in the open wheel race cars we were driving on a course used a similar engagement as an MC. It had no synchro and it would just say "clonk" when you shifted. You had to be distinct, otherwise it would grind, but it was very easy to shift. It also had straight cut gears, and it was whining quite loudly.
The MC gearboxes I've seen had all slant cut gears and was quiet, but would "clonk" a bit when shifting.
Thomas
29 juli 2016 kl. 21:40 skrev Julian Kift <julian_kift@hotmail.com>:
Charlie,
Yes the older British cars often lack a syncro in 1st (and reverse is not usually a syncro either). Shifting a non syncro requires getting the gears that are to be meshed spinning at roughly the same speed, best achieved via double clutching or knowing what revs to shift at (18 wheelers are all non syncro boxes, most truckers can shift without use of a clutch). You could try this in your folks MG-TD, i recommend some distance from their house until you have it down U1F609
The main difference in a motorcycle gearbox is it is a "constant mesh" i.e. all the gears are constantly meshed and spinning(no syncro required to spin up the gears). It is also sequential so shifting through the gears in order without ability bypass a gear (other than neutral to second as neutral is half click between first and second).
Julian __________________________________________________________________
From: Charles McCall <charlesmccall@gmail.com> Sent: Friday, July 29, 2016 11:56 AM To: 'Julian Kift'; 'Peter Menyhart'; 'pantera forum'; detomaso@server.detomasolist.com Subject: RE: [DeTomaso] Absolutely zero DT content
Julian - educate me if you don't mind.
You say that motorcycle gearboxes are non syncromesh.
My folks have a 1952 MG-TD that has syncromesh in 2^nd, 3^rd, and 4^th, but not first. When you come to a stop, if you haven't come to a COMPLETE stop it'll crunch when you put it in first. It won't crunch if you put it in second and I was told that this was due to the lack of syncromesh.
If this is true, why doesn't my bike crunch when putting it in first while still rolling?
From: Julian Kift [mailto:julian_kift@hotmail.com] Sent: viernes, 29 de julio de 2016 17:10 To: Peter Menyhart; Charles McCall; pantera forum; detomaso@server.detomasolist.com Subject: Re: [DeTomaso] Absolutely zero DT content
Charles,
I would postulate it is because a motorcycle gearbox is already a "race box", i.e. non syncromesh, dog box with straight cut gears, which is essentially the simplest and lightest gearbox you can get. Shifting without the clutch is fairly universal on race bikes and similar to race cars permitted by the straight cut gear design. Motorcycle clutches are now dry (whereas yours is probably a wet clutch) and much lighter design and I would only use the very lightest clutch pressure on my street bike (Ducati superbike) just to take the pressure off the gears.
Julian _____________________________________________________________________
From: DeTomaso <[1]detomaso-bounces@server.detomasolist.com> on behalf of Peter Menyhart <[2]pmenyhart@msn.com> Sent: Friday, July 29, 2016 5:29 AM To: Charles McCall; pantera forum Subject: Re: [DeTomaso] Absolutely zero DT content
Interesting question, when I'm in Germany in september I'll ask my brother.He works in development at BMW Motorcycle and also races vintage Wankel bikes. I think your right,the weight gain is probably too much. Peter check out our website at: [3]www.whitehorseranch.com From: [4]charlesmccall@gmail.com Date: Fri, 29 Jul 2016 09:45:11 +0200 To: [5]detomaso@detomasolist.com Subject: [DeTomaso] Absolutely zero DT content Motorcycle ramblings with a question at the end....
The weather has been absolutely fantastic here for the past few weeks, so I have been using my motorcycle for my daily commute to and from work. It's recently back on the road after more or less being in storage for 18 years. It is true that long term storage isn't good for vehicles - either cars or motorcycles. I filled the tank up with gas and it all ran right on the floor... hoses that had disintegrated with time. Got that repaired.
The gas on the floor was mixing with a massive oil leak caused by a gasket on the cam tensioner that dried out and cracked. Got that fixed.
I'm glad my motorcycle is air-cooled or I know what would be leaking now! We didn't get off to a good start this year!
The motorcycle is a 1982 Suzuki GS650, nothing particularly special but with a lot of sentimental value. I bought it when I was 19 and a college sophomore. I'd never been on a motorcycle in my life - neither as a passenger nor a driver. I walked into the local Suzuki dealer and said "I like that one, I'll buy it!" and paid for it with my visa card, at 19.6% interest. And I wonder why it took me so long to pay off my college loans? ;-)
We went to the parking lot and the salesman told me "This is the clutch, here's how you change gears, this is the front brake....have fun!" And I learned how to drive on the way home. Ah, youth!
The motorcycle has been all over the place. I went to Cornell University, in upstate NY, and my girlfriend at the time went to Michigan, so it made the trip many times. It's attended Sturgis (despite being a Japanese bike, but I drove it there unlike many of the Harleys!) prowled the streets of Chicago, etc. But it got put into storage when I moved to Europe and took a long time to catch up to me. It recently was made road-worthy and is still wearing US plates, although I'll have to fix that over the next year. It is very difficult and very expensive to insure a vehicle in Europe with US plates. But for those from the US or Canada attending Le Mans Classic - -IT CAN BE DONE!
Anyway, my question. The tendency in race cars and sports cars is moving away from a manual transmission to an automatic. I know that isn't quite true but don't really care if there is still technically a clutch or not - if there isn't a clutch pedal inside, then it's an automatic! Why hasn't the same thing happened with motorcycles? Because the shift time on a motorcycle is already so short? Do racers even use the clutch on a race bike? The weight associated with the mechanism is a larger percentage of a light bike as opposed to a car?
Just wondering this morning, as it was a nice morning for a ride and as there's no radio my mind went wandering... _______________________________________________ Detomaso Email List is not managed by POCA Posted emails must not exceed 1.5 Megabytes DeTomaso mailing list [6]DeTomaso@server.detomasolist.com [7]http://server.detomasolist.com/mailman/listinfo/detomaso To manage your subscription (change email address, unsubscribe, etc.) use the links above. Members who post to this list grant license to the list to forward any message posted here to all past, current, or future members of the list. They also grant the list owner permission to maintain an archive or approve the archiving of list messages.
References
1. mailto:detomaso-bounces@server.detomasolist.com 2. mailto:pmenyhart@msn.com 3. http://www.whitehorseranch.com/ 4. mailto:charlesmccall@gmail.com 5. mailto:detomaso@detomasolist.com 6. mailto:DeTomaso@server.detomasolist.com 7. http://server.detomasolist.com/mailman/listinfo/detomaso _______________________________________________
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