The Art Of Double-Clutching
- Amskeptic
- IAC "Help Desk"
- Status: Offline
The Art Of Double-Clutching
The updated version, five luxurious pages where the original was but one.
Please read through the whole thang and see if there is sufficient flow that you are "insightfulized" by the end. This is my first computer-generated font + Paint® drawing assistance. It takes three times longer than straight drawing, but with no paper to crumple up and throw away every time I mis-printed a word, the time savings is ENORMOUSLY . . . negligible.
Colin
Please read through the whole thang and see if there is sufficient flow that you are "insightfulized" by the end. This is my first computer-generated font + Paint® drawing assistance. It takes three times longer than straight drawing, but with no paper to crumple up and throw away every time I mis-printed a word, the time savings is ENORMOUSLY . . . negligible.
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- grandfatherjim
- Addicted!
- Location: near Ottawa Canada
- Status: Offline
Page 1 - no apostrophe in LET'S
Page 2 at the bottom - I don't get the colour coding where you show which gears arre locked to the shaft vs. spinning freely - the concentric circle colours don't match the gearsets.
Also, when at a stop light, where you say everything above coloured green - do you mean everything above withat least some green in it?
Page 3 - I start to get lost. I have rebuilt a couple of transmissions and so know how synchronizers work, but think I would have a hard time following this if I hadn't. My suggestion would be to explain the synchronizers themselves (page 4 content) before the typical downshift scenario (page 3 content). All through page 3 I am wondering...how can this be? are these synchros magic? - as I always wondered before tearing into a transmission.
I think also in the preface, it would be a nice addition to tell how our forebears all had to double-clutch, and how it's a nearly lost art that we can learn to our car's benefit as well as for our personal satisfaction. To put it another way, if you ever want to try driving your cousin'd Model A, you need to learn this technique.
All told I would say you have gone a long way toward demystifying a very difficult topic.
Finally, I might suggest spreading the last two pages into three. They are intimidatingly dense to my eye.
Jim
Page 2 at the bottom - I don't get the colour coding where you show which gears arre locked to the shaft vs. spinning freely - the concentric circle colours don't match the gearsets.
Also, when at a stop light, where you say everything above coloured green - do you mean everything above withat least some green in it?
Page 3 - I start to get lost. I have rebuilt a couple of transmissions and so know how synchronizers work, but think I would have a hard time following this if I hadn't. My suggestion would be to explain the synchronizers themselves (page 4 content) before the typical downshift scenario (page 3 content). All through page 3 I am wondering...how can this be? are these synchros magic? - as I always wondered before tearing into a transmission.
I think also in the preface, it would be a nice addition to tell how our forebears all had to double-clutch, and how it's a nearly lost art that we can learn to our car's benefit as well as for our personal satisfaction. To put it another way, if you ever want to try driving your cousin'd Model A, you need to learn this technique.
All told I would say you have gone a long way toward demystifying a very difficult topic.
Finally, I might suggest spreading the last two pages into three. They are intimidatingly dense to my eye.
Jim
- hambone
- Post-Industrial Non-Secular Mennonite
- Location: Portland, Ore.
- Status: Offline
Is this how you're able to drive a car with a broken clutch cable by "finding the sweet spot"? Must be.
Makes sense, and I think I already do it intuitively. In a nutshell, only shift at the RPM/gear combo that is correct at that moment, or else it beats on your engine and trans.
Makes sense, and I think I already do it intuitively. In a nutshell, only shift at the RPM/gear combo that is correct at that moment, or else it beats on your engine and trans.
http://greencascadia.blogspot.com
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
- dhoch14
- Old School!
- Location: Granada, ES
- Status: Offline
- hambone
- Post-Industrial Non-Secular Mennonite
- Location: Portland, Ore.
- Status: Offline
Can't you leave the clutch in? It's still neutral.
http://greencascadia.blogspot.com
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
http://pdxvolksfolks.blogspot.com
it balances on your head just like a mattress balances on a bottle of wine
your brand new leopard skin pillbox hat
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Your engine has to communicate with the input shaft. On a downshift, we have to speed up the input shaft to match the gear we want, and the engine is the only device in the vicinity that can do that for us, other than the synchronizer.hambone wrote:Can't you leave the clutch in? It's still neutral.
On an upshift, yes you can time a regular shift to allow the input shaft to slow down of its own accord to match the next gear up, but I am so double-clutch hard-wired now that I can't shift normally.
Colin
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- Amskeptic
- IAC "Help Desk"
- Status: Offline
WHEN you double clutch, you do the following:dhoch14 wrote:Ok.
-dave
3rd to 4th example:
Driving in 3rd, getting close to 4th
CLUTCH IN, SHIFT TO NEUTRAL,
CLUTCH OUT WHILE IN NEUTRAL,
( The Neutral Staging Area! Match the engine speed here)
CLUTCH IN, SHIFT TO 4TH,
CLUTCH OUT.
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- Amskeptic
- IAC "Help Desk"
- Status: Offline
You are correct. I pasted that "Let's" (as in Let's learn about synchronizers!) in where the word "allowed" used to be before I ran out of room. and forgot to update its new context . . . Good eye!grandfatherjim wrote: Page 1 - no apostrophe in LET'S
Clumsy first fully computer-generated picture. Yes, so the big green and red circles were supposed to denote the gears being firmly attached to the shafts, as in:grandfatherjim wrote: Page 2 at the bottom - I don't get the colour coding where you show which gears arre locked to the shaft vs. spinning freely - the concentric circle colours don't match the gearsets.
Also, when at a stop light, where you say everything above coloured green - do you mean everything above withat least some green in it?
1st and 2nd UPPER gears are attached to the INPUT shaft, while their lower gears spin around the output shaft on bearings.
3rd and 4th LOWER gears are attached to the OUTPUT shaft while their upper gears are spinning on bearings on the input shaft.
Page 3 did not want to get lost in the "how", just the what.grandfatherjim wrote: Page 3 - I start to get lost. I have rebuilt a couple of transmissions and so know how synchronizers work, but think I would have a hard time following this if I hadn't. My suggestion would be to explain the synchronizers themselves (page 4 content) before the typical downshift scenario (page 3 content). All through page 3 I am wondering...how can this be? are these synchros magic? - as I always wondered before tearing into a transmission.
I wanted people to sit on the magic like I had to for thirty five years or so.
Yep, you were doing 1,760 rpm in 4th, you moved the gearshift and now the engine is going faster.
Then I started page 4 with "What happened when you shifted?"
I only got so far as the "improved sense of participation" in the art of driving. I was having difficulty (oh was I) with my stupid fonts not being legible below 28 point and had to remove a lot of words in the name of size. Then I found an old previous font that was darker, but the alignment of :"';, were awful. Anyways . . .grandfatherjim wrote: I think also in the preface, it would be a nice addition to tell how our forebears all had to double-clutch, and how it's a nearly lost art that we can learn to our car's benefit as well as for our personal satisfaction. To put it another way, if you ever want to try driving your cousin'd Model A, you need to learn this technique.
I agree. Can you believe that the first one was all on one page?grandfatherjim wrote: All told I would say you have gone a long way toward demystifying a very difficult topic.
Finally, I might suggest spreading the last two pages into three. They are intimidatingly dense to my eye.
Jim
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- bretski
- Ellipsis-Meister
- Location: out of hibernation...for now
- Status: Offline
My cluttered, ADD-ridden mind finds this picture soothing. How's about a bigger version for the afflicted???Amskeptic wrote:Can you believe that the first one was all on one page?
PS - After much practice, my 15mph 2nd-to-1st downshift has become frighteningly smooth...and it scares the crap outta my passengers. Tee-hee.
1978 Deluxe Westfalia - "Klaus"
"transcripts are overrated. hardware store receipts: those are useful." --skin daddio
"transcripts are overrated. hardware store receipts: those are useful." --skin daddio
- Amskeptic
- IAC "Help Desk"
- Status: Offline
Amazing. I recoil from that thing . . . but remember how fun it was to draw.bretski wrote:My cluttered, ADD-ridden mind finds this picture soothing. How's about a bigger version for the afflicted???Amskeptic wrote:Can you believe that the first one was all on one page?
PS - After much practice, my 15mph 2nd-to-1st downshift has become frighteningly smooth...and it scares the crap outta my passengers. Tee-hee.
Colin
(click it and expand your browser window or download it and expand)
(if you download and expand the new page 1 and 5 you will see almost hidden things like the numbers on the speedometer, clock and fuel gauge)
BobD - 78 Bus . . . 112,730 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
Chloe - 70 bus . . . 217,593 miles
Naranja - 77 Westy . . . 142,970 miles
Pluck - 1973 Squareback . . . . . . 55,600 miles
Alexus - 91 Lexus LS400 . . . 96,675 miles
- bretski
- Ellipsis-Meister
- Location: out of hibernation...for now
- Status: Offline
- BellePlaine
- IAC Addict!
- Location: Minnesota
- Status: Offline
I have a question. You gas the engine to match the speed of the down shift; I understand this. But do you continue to gas as you put the clutch in and shift to 4th? I imagine that you do, but holding high rpm's to an engine under no load would be hard for me to get used to.Amskeptic wrote:WHEN you double clutch, you do the following:dhoch14 wrote:Ok.
-dave
3rd to 4th example:
Driving in 3rd, getting close to 4th
CLUTCH IN, SHIFT TO NEUTRAL,
CLUTCH OUT WHILE IN NEUTRAL,
( The Neutral Staging Area! Match the engine speed here)
CLUTCH IN, SHIFT TO 4TH,
CLUTCH OUT.
1975 Riviera we call "Spider-Man"
- grandfatherjim
- Addicted!
- Location: near Ottawa Canada
- Status: Offline
- BellePlaine
- IAC Addict!
- Location: Minnesota
- Status: Offline
I'm sorry, I misread. I was thinking of downshifting from 4th to 3rd. Do HOLD the RPMs while in N and clutching into 4th. I suppose that you do, huh? It's just that I'm accustomed to letting off the gas while clutching.grandfatherjim wrote:When going from third to fourth the engine speed will need to drop.
Jim
1975 Riviera we call "Spider-Man"