Dual throttle cables

[Constant Mesh]

Why do motorcycles uses dual throttle cables and cars don't? They both use a return spring to close the throttle. My older Honda cars had one cable between the accelerator and throttle assembly. No doubt the spring was stronger than those on motorcycles.

My newest Honda car has throttle by wire. Comparing it to the Yamaha throttle by wire one notices that Honda uses multiple accelerator rheostats at the pedal. The computer must be comparing the inputs from the sensors to determine if they're working OK. It appears that Yamaha uses only one rheostat at the end of the throttle cables. Hopefully it's a higher quality device than the one which reports throttle valve position. Yamaha does include a mechanical linkage which forces the throttle valves closed when the throttle grip is closed. Maybe that's their fail safe device for a runaway engine.

 

[HotRodZilla]

The fail safe device for a "runaway" engine would be the key. Or in our case, the kill switch. All that baloney about peoples' cars running away from them is just further proof that some people are ******* idiots...

As far as the dual cable setup, I have no idea. Maybe its to reduce tension. People already gripe that the throttle is stiff. Imagine if it was purposely harder? The whining would never stop.

Oh...and so that I don't hurt any feelings: I mean no offense to any whiners that may read this and feel slighted.

 

[majicmaker]

The fail safe device for a "runaway" engine would be the key. Or in our case, the kill switch. All that baloney about peoples' cars running away from them is just further proof that some people are ******* idiots...

As far as the dual cable setup, I have no idea. Maybe its to reduce tension. People already gripe that the throttle is stiff. Imagine if it was purposely harder? The whining would never stop.

Oh...and so that I don't hurt any feelings: I mean no offense to any whiners that may read this and feel slighted.

No Offense Taken!

 

[wfooshee]

On a car, you just release pressure on the pedal, there's no positive release action by the driver. He doesn't put his foot under the pedal to pull it up from the floor.

On a bike the rider twists the grip both to open the throttle and to close it. He opens it and he closes it, rather than just letting go go the grip to close the throttle. Easy to have a cable that pulls each direction.

On a car, if the throttle sticks and you let off the gas, the throttle stays stuck until the return spring can take effect, if it ever does.

On a bike, if the throttle sticks and you twist the grip closed, the throttle follows the grip because of the return cable, removing the "Oh, ****!" moment of panic trying to remember about keys and kill switches as you ride through a busy intersection against the light. It would even be possible for the rider to never realize that the throttle would have stuck open were it not for the positive return cable.

So why not on a car? Again, a car's driver has no positive action to close the throttle; he simply removes pressure from the pedal. Since the throttle spring is the only closing action available, a return cable would serve no purpose.

 

[mcatrophy]

Why do motorcycles uses dual throttle cables and cars don't? ...

In the UK, probably in Europe, and possibly even in the Land Of The Free as well as many other markets, it is a legal requirement that all current production motorcycles must have a throttle return cable.

As to whether this law is sensible (or fair) is another matter (this isn't intended as a political rant), but that's certainly one reason why they're there.

Remember cars must have seat belts and motorcycles don't. Yet

.

 

[kolonial72]

Oh...and so that I don't hurt any feelings: I mean no offense to any whiners that may read this and feel slighted.

All of a sudden you're worried about hurting feelings? You gettin' soft in yer old age?

 

[Chuck35]

The fail safe device for a "runaway" engine would be the key. Or in our case, the kill switch. All that baloney about peoples' cars running away from them is just further proof that some people are ******* idiots...

The case that sent "runaway throttle" fear over the edge was a (former?) State Trooper in a rental car. This car didn't have a conventional key, it had a start button. If you hold in the start button for 3 seconds or so it will kill the engine.But who knows that ****?

Then there is the gear shifter,the big N means No go No mo. But this Trooper calls 911 to request help as he approaches the end of the road ant a "T" intersection.

Ya, fookin idiot. Its a shame his passengers died as a result of his stupidity / panic. Darwin's laws should have exceptions for innocent passengers.

Soap Box mode : off now

 

[wfooshee]

I would submit (again) that a car has no positive action by the driver to close the throttle. I would add that the throttle spring is probably much stronger on a car than a bike, despite what we feel in our wrists after 400 miles sometimes.

In a car, the throttle being closed by the spring lifts the accelerator, it's not the accelerator being lifted that closes the throttle. There is no reason to have a return cable, as it would have nothing to do.

I suppose you could fasten your foot to the pedal somehow, maybe Velcro soles.....

A bike doesn't have to rely on just letting go of the throttle to close it. We can force it closed simply by twisting the other way. The spring is there if you let go, and to keep tension on the thing (an untensioned throttle grip would be very odd.) But the return cable is an easy way to have a positive action at the grip, and maybe also to get away with just a tiny bit softer throttle return spring.

 

[lnewlf]

The fail safe device for a "runaway" engine would be the key. Or in our case, the kill switch. All that baloney about peoples' cars running away from them is just further proof that some people are ******* idiots...

As far as the dual cable setup, I have no idea. Maybe its to reduce tension. People already gripe that the throttle is stiff. Imagine if it was purposely harder? The whining would never stop.

Oh...and so that I don't hurt any feelings: I mean no offense to any whiners that may read this and feel slighted.

And for those who are offended....

https://video.search.yahoo.com/video/play?p=youtube+shaving+cream+song&tnr=21&vid=&turl=http%3A%2F%2Fts3.mm.bing.net%2Fth%3Fid%3DU.4857600188416086%26pid%3D15.1&tit=Shaving+Cream+Song

 

[RadioHowie]

Oh...and so that I don't hurt any feelings: I mean no offense to any whiners that may read this and feel slighted.

All of a sudden you're worried about hurting feelings? You gettin' soft in yer old age head?