Shifting straight cut gears FYI this weekend nascar race cars are using straight cut gears in their transmissions! They aren't using the clutch to change gears 4th to 3rd and back to 4th! So a learning how to change gears with straight cut gears watch the race and learn!
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Re: Shifting straight cut gears I ALWAYS watch NASCAR!!!!
Never saw a cut away of the trans. They must have synchronizers that are like DOG CLUTCHES??? Bill Fan |
Re: Shifting straight cut gears No synchronization, just straight cut gears, fs1 showed a cut away and then how a driver was shifting! It blew me away, off the gas then bang into gear so quickly almost hard to see I know not much change in ratio 3rd to 4th but I was amazed!
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Re: Shifting straight cut gears Recently a couple of cars got stuck in gear. When Jr. inadvertently shifted to second, instead of fourth, it over-reved, blew the engine & damaged the trans!
They shift a LOT, without the clutch, when running the ROAD courses. "Wonder" if a NASCAR box could be stuffed in a Model A??? Bill Watcher |
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Re: Shifting straight cut gears So it is done by "DOG CLUTCHES"
Bill W. & Dog |
Re: Shifting straight cut gears Years ago as a teenager I used to shift my Model A coupe from 1st to 2nd and 2nd to 3rd without using my clutch.
No grinding. I could "instantly" feel the immediate thrust forward like someone bumped my car from the rear. Figured it may break a transmission gear tooth so I stopped doing it. |
Re: Shifting straight cut gears Yes Bill, they are dog boxes, like the old Harley gears with the dog teeth on them. I'll try and post a picture of a gear.
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Re: Shifting straight cut gears I shift without using the clutch. It doesn't take much to figure out how to do it.
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Re: Shifting straight cut gears Thanks Art for the u-tube link! FS1 with Larry Mac didn't explain it in detail, only to say straight cut gear transmissions are stronger transmissions! It was cool seeing the drivers shifting.
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Re: Shifting straight cut gears 1 Attachment(s)
It's the same type of transmission design that is used in just about every motorcycle from the 60's on. Nothing new.
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Re: Shifting straight cut gears It's not the straight-cut gears that makes us double-clutch the Model A trans, it's the lack of synchronizers.
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Re: Shifting straight cut gears My father 'float' shifted a model A like butter...only used the clutch to take off..been 40 years for me,I got the hang of it as a teenager. Looks like I'll master it again,brought a 50A home yesterday.Double clutching is the same thing,the pause in the middle of the double clutch is to allow the input shaft speed and the output shaft speed to match through the cluster gear..a syncronizer does the same thing,it 'forces' the meshing gears to match speeds..
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Re: Shifting straight cut gears Remember Modern Transmissions all the gears are in CONSTANT MESH unlike the Model A which is SLIDING THE GEARS In and out of Mesh.
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Re: Shifting straight cut gears I never "Double Clutch" in my 1928 Roadster Pickup and it has the AA 4 Speed Transmission. I wait about 2 seconds between gear changes and its smooth.
Double Clutching is ok but you are wearing out the Thrust surfaces of your Babbitt quicker and same goes for your Pedals, bushings and clutch linkages. Something to think about. |
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Might be worth remembering that these racing drivers don't care about the longevity of the gearbox - it's all about the win. Things are a bit different on the road (well, for most of us.:D) |
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Bill Biker? |
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