Reving engine with clutch in

[QC]

Re: Reving engine with clutch in

This is silly, every commercial truck on the planet uses the same style throw out bearings, the same style clutches and transmissions that requires a "blip" on the throttle to get it in gear. All he is saying is that he uses that blip to eliminate jerking and kicking around. He is not hurting ANYTHING, and he is technically safer by saving his brakes a little. Yes, there is some additional wear by actually using the equipment he has paid for, but I challenge any of you to quantify it . . .

 

[bowman316]

Re: Reving engine with clutch in

yea, I'm not revving anthing, just bliping the gas as i let out the clutch.
I can kinda feel where the engine wants to go as i let it out.
Many times i will put it in neutral and coast for a while, then when i need to accelerate again, put in in the right gear, and give a lil gas to get the tach in the right spot.

 

[bassman284]

Re: Reving engine with clutch in

You talking about shifting without the clutch at all?

No clutch works good in big rigs with unsynchronized transmissions. When I was driving, I only used the clutch to start and stop. Lots easier than pumping that clutch all the time.

Clutchless shifting doesn't work very well with a synchronized transmission in my experience. At least until you burn up the synchronizers, then it works great.

 

[QC]

Re: Reving engine with clutch in

And my point on shifting without was only that there is absolutely no jerking or sensation at all if done properly . . . blipping the throttle results in something very similar.

Funny thing to try with a manual tranny rental car, or maybe your ex-wife's car If you push on the shifter towards first gear, clutch out, car stopped, and just keep some pressure there, the car will start rolling. I am going to win a bet on this one day. I know you can start and stop a manual car without a clutch by leaving in gear and cranking in gear. But I bet I could get one going up to full road speed, that was already running in neutral and stopped on level ground, without touching the clutch. Again, not with my car, but whomever I bet with's car . . .

 

[bowman316]

Re: Reving engine with clutch in

Interesting article about synchro's found on wikipedia.


The synchronizer[2] has to change the momentum of the entire input shaft and clutch disk. Additionally, it can be abused by exposure to the momentum and power of the engine itself, which is what happens when attempts are made to select a gear without fully disengaging the clutch. This causes extra wear on the rings and sleeves, reducing their service life. When an experimenting driver tries to "match the revs" on a synchronized transmission and force it into gear without using the clutch, the synchronizer will make up for any discrepancy in RPM. The success in engaging the gear without clutching can deceive the driver into thinking that the RPM of the layshaft and transmission were actually exactly matched. Nevertheless, approximate "rev-matching" with clutching can decrease the general delta between layshaft and transmission and decrease synchro wear.

this makes it sound like power shifting in a car with synchros is easier, and will wear things less. I can see that rev matching is a must in a big rig, but just nice to do in a regular car. Gears would grind if you did not rev match in a big rig right?

 

[IVAZ]

Re: Reving engine with clutch in

This is silly, every commercial truck on the planet uses the same style throw out bearings, the same style clutches and transmissions that requires a "blip" on the throttle to get it in gear.

That is true. On vehicles that have automatics that can also be shifted manually they "blip" the throttle on downshifts automatically. It?s only true on the real dual clutch automatics like Audi, Ferrari, Aston Martin, Lamborghini and even some Volkswagens (they own Audi and Lamborghini). Most domestic vehicles that have that feature just slip into gear.

 

[MikDee]

Re: Reving engine with clutch in

And my point on shifting without was only that there is absolutely no jerking or sensation at all if done properly . . . blipping the throttle results in something very similar.

Funny thing to try with a manual tranny rental car, or maybe your ex-wife's car If you push on the shifter towards first gear, clutch out, car stopped, and just keep some pressure there, the car will start rolling. I am going to win a bet on this one day. I know you can start and stop a manual car without a clutch by leaving in gear and cranking in gear. But I bet I could get one going up to full road speed, that was already running in neutral and stopped on level ground, without touching the clutch. Again, not with my car, but whomever I bet with's car . . .

I've never heard of starting a car rolling in 1st gear without using the clutch, but I've driven a manual shift car many times through the gears (once it's rolling) without using the clutch, just by synchronizing the engine rpm with the transmission.

Years ago Mom had a new 1965 Pontiac Tempest V8 3spd stick, with no synchromesh 1st gear and it was a bear to get into 1st gear unless you came to a dead stop each time, it was "Grind city". It wasn't until after that time that GM had full synchromesh 3 spd, trannies.

 

[TilliamWe]

Re: Reving engine with clutch in

This is silly, every commercial truck on the planet uses the same style throw out bearings, the same style clutches and transmissions that requires a "blip" on the throttle to get it in gear. . . .

Yes, QC, but you are forgetting, the "blip" comes only after you have let off the clutch in between the shift. He is keeping the clutch depressed and "blipping", that is not same thing. And thanks waterinfuel, for confirming the throw out bearing is the one I am thinking of.

 

[TilliamWe]

Re: Reving engine with clutch in

All this additional talk of shifting without a clutch at all...

Any of you ever down shift without the clutch? A Borg Warner T-5 toploader is the best. Did it all the time in our 88 Mustang GT. I hardly ever used the clutch to upshift, especially when driving in Cleveland.
And on a Fuller Roadranger 13 speed (I assume on their others too, but I only ever drove 13spds) you can single clutch on upshifts, if you are pulling (or pushing) hard enough on the shift lever when you let off the throttle and start to push the clutch. It comes out of gear while you are still depressing the clutch, and it slides in to the next gear at the bottom of the clutch travel. Viola, single clutch upshifting in a non-synchronized transmission. Think of the wear that saves! he he

 

[bowman316]

Re: Reving engine with clutch in

i was messin aroun on the drive home today, and i would get to my max speed in gear 2, then let off the gas, and apply light pressure on the stick, until it came out of 2nd and went into n, then i kept allpling pressure to try to get it into 3rd. and it quickly went in.

no jerk or grind.

Sometimes i would have to keep it in neutral and rev the engine back up, then wait for the rpm's to match so i could get in the next gear.
sometime it shifted gears in a matter or less than a second, no clutch.

It didn't seem to hurt anything.

 

[slasmith1]

Re: Reving engine with clutch in

i was messin aroun on the drive home today, and i would get to my max speed in gear 2, then let off the gas, and apply light pressure on the stick, until it came out of 2nd and went into n, then i kept allpling pressure to try to get it into 3rd. and it quickly went in.

no jerk or grind.

Sometimes i would have to keep it in neutral and rev the engine back up, then wait for the rpm's to match so i could get in the next gear.
sometime it shifted gears in a matter or less than a second, no clutch.

It didn't seem to hurt anything.

you just learned how to shift a semi the only thing a clutch is for is starting and stopping.

 

[QC]

Re: Reving engine with clutch in

You know what's funny? Those wussy European Truck Drivers use full Synchromesh 16 speeds You wanna something even funnier? Why the flip hasn't that caught on here? Never will though as both have almost completely changed over to Automatic manuals. Don't gotta do nuttin' but push the go pedal now. I'll bet pretty soon they're gonna let chicks drive 'em

 

[slasmith1]

Re: Reving engine with clutch in

You know what's funny? Those wussy European Truck Drivers use full Synchromesh 16 speeds You wanna something even funnier? Why the flip hasn't that caught on here? Never will though as both have almost completely changed over to Automatic manuals. Don't gotta do nuttin' but push the go pedal now. I'll bet pretty soon they're gonna let chicks drive 'em

Even blondes?

 

[QC]

Re: Reving engine with clutch in

LadyFish, look ^^^^

 

[puddle jumper]

Re: Reving engine with clutch in

i was messin aroun on the drive home today, and i would get to my max speed in gear 2, then let off the gas, and apply light pressure on the stick, until it came out of 2nd and went into n, then i kept allpling pressure to try to get it into 3rd. and it quickly went in.

no jerk or grind.

Sometimes i would have to keep it in neutral and rev the engine back up, then wait for the rpm's to match so i could get in the next gear.
sometime it shifted gears in a matter or less than a second, no clutch.

It didn't seem to hurt anything.[/quo

If you keep shifting like that in your Ranger you will soon have shifting problems as you will bend your shift forks in the trans.Giving the gas a little rev in between shifts is not a big deal. But to rev it way up with the clutch in is bad and you could blow up your clutch and it could come through the floor.