Come on in and confess please

Mikey · 03-19-2009, 04:59 AM

Quote:

Originally Posted by zed

theory isn't reliable in the real world.

ask any EE if you can jump a bike with a car battery, in theory it works, in practice I have seen electronics fried.

I've done it dozens of times with no ill effects. As long as the car isn't running, it's not a big deal.

I've looked for 7th on the bikes that have a 6th. The GSXR only has 5 gears, and I've never gone looking for 6th. This island just doesn't have that kind of running room anywhere.

I've gone for -1st a couple of times too. That's not too bad. What does suck is trying to downshift to 2nd for an upcoming corner, only to find out that you were already in second, slamming into 1st and locking th rear wheel. That's definite pucker factor.

zed · 03-19-2009, 10:16 AM

Quote:

Originally Posted by Mikey

I've done it dozens of times with no ill effects. As long as the car isn't running, it's not a big deal.

Quote:

Originally Posted by Rsv1000R

Then either it was done wrong, or there was something wrong with the bike. 12volts is 12volts.

it's just that EE's will say that it can never happen, what they don't take into account is a weak part and that usually ends up being the igniter/cdi. it's up to you if you want to take the chance.

Rsv1000R · 03-19-2009, 12:22 PM

Quote:

Originally Posted by zed

it's just that EE's will say that it can never happen, what they don't take into account is a weak part and that usually ends up being the igniter/cdi. it's up to you if you want to take the chance.

That being the case a MC battery would cause the same damage. And if it caused the cdi to burn up, it was bad before you hooked the battery up.

zed · 03-19-2009, 12:39 PM

Quote:

Originally Posted by Rsv1000R

That being the case a MC battery would cause the same damage. And if it caused the cdi to burn up, it was bad before you hooked the battery up.

available amperage from a motorcycle battery is much lower than the smallest car battery.

just because you have never seen it doesn't mean it can't or hasn't happened.

Rsv1000R · 03-19-2009, 01:24 PM

Quote:

Originally Posted by zed

available amperage from a motorcycle battery is much lower than the smallest car battery.

just because you have never seen it doesn't mean it can't or hasn't happened.

You should go read the cold cranking amp chart on this page. At 10 volts your motorcycle battery is producing 100 amps, 100 amps is enough to fry all the electronics on a bike except the starting circuit.

Probably the reason the battery's dead in the first place is the electronics are shorted.

Trip · 03-19-2009, 04:10 PM

Quote:

Originally Posted by zed

theory isn't reliable in the real world.

ask any EE if you can jump a bike with a car battery, in theory it works, in practice I have seen electronics fried.

Hello, I am a practicing EE here to tell you that you are wrong. Starting a motorcycle from a car battery is fine as long as the car isn't started.

Quote:

Originally Posted by Mikey

I've done it dozens of times with no ill effects. As long as the car isn't running, it's not a big deal.

Correct, the charging system for a car is much more powerful and can fry electronics. It's not the battery that will damage the motorcycle, it's the charging system from the car.

12 volts is 12 volts as stated earlier in this thread, what's different about the car battery is it's capable of providing for a much larger load. Capability doesn't not mean that it will distribute it's full load to what it's connected to. Take your wall plug for example, it's capable of much more than the normal small electronics we plug into it, but it doesn't destroy them...

zed · 03-19-2009, 04:33 PM

Quote:

Originally Posted by Trip

Hello, I am a practicing EE here to tell you that you are wrong. Starting a motorcycle from a car battery is fine as long as the car isn't started.

seems you are not the only one either.

most mechanics don't know what they are talking about but expected to know how to fix it after the customer screws it up.

Trip · 03-19-2009, 04:41 PM

Quote:

Originally Posted by zed

seems you are not the only one either.

most mechanics don't know what they are talking about but expected to know how to fix it after the customer screws it up.

Dude, seriously shut the fuck up and go back to flipping burgers.

Unlike that mechanic, a failure in my position means I compromise the ability of a nuclear plant to shutdown in the event of accidents not a pissed off customer. I deal with safety related power distribution systems on a daily basis. This is real world, not theory.

the chi · 03-19-2009, 04:53 PM

Quote:

Originally Posted by ZUKIMON

Guilty on all counts. I've also looked for 6th in the cage!

Im with ya...tho honestly, I rarely ever pay attention to the actual # of the gear I am in, I go based on feel. Kinda the same with my car, even tho I can see it, if it doesnt "feel" right (boggy or screaming uncomfortably) I shift. When I do track days I have no gauges at all, and do everything based on instinct and feel, I just transition back and forth. Empathic Mechanic.

Quote:

Originally Posted by Trip

Dude, seriously shut the fuck up and go back to flipping burgers.

Unlike that mechanic, a failure in my position means I compromise the ability of a nuclear plant to shutdown in the event of accidents not a pissed off customer. I deal with safety related power distribution systems on a daily basis. This is real world, not theory.

The next time a power plant blows up, Im blaming you.

Trip · 03-19-2009, 04:56 PM

Quote:

Originally Posted by The Chi

The next time a power plant blows up, Im blaming you.

If a nuke plant goes up, I don't think I would want to work at one anymore anyway.