Cranking RPM

[mainlylinux]

Can anyone tell me what the approximate cranking rpm should be of an XS11 with a healthy battery?

Thx,

Dan

[bandet01]

i aint got a clue but when i was working on my bros bike the start didnt spin that fast so i would say 500 rpm or less i think it has alot of other things to deal with when starting a bike then just the cranking rpm like fuel spark and compression too

[LoserShoes]

Hook your scope up to the pickup coil, crank it, and get the milliseconds from leading edge to leading edge. That gives you secs/rev. Divide 1/(sec/rev) = revs/sec. 60 * revs/sec = rpm.

Don't know how much math you know, so there it is.

Steve

[mainlylinux]

Bike's 27 miles from the scope :-)

I did get a schmitt trigger hooked up the other day to the pickup coil output - and it works. But, I doubt it will work if I slow the rpm's down to cranking speed. I think the wave form will be to weak to trigger the schmitt trigger.

Looking to amplify the signal now - just trying to make it as easy and painless as possible.

Luckily I got a whole bunch of circuit boards from a client of mine filled up with all kinds of goodies!!

Dan

[mainlylinux]

On that note, anyone know of a device to amplify and create a nice square wave, all in one package, with minimum # of pins for a tiny outlay of $$$?

:-)

Dan

[JWSanders]

555 timer circuit is exactly what you're looking for, I believe.



Easy to use, requires a very small footprint circuit to drive it. Very reliable, too. Could be encased in epoxy and last forever.

100mA output, I believe. I'd bet there are higher powered versions, too. This thing's been around forever.

[deeparchae]

I'm not sure this would work, but you could loop the signal through a op amp ( quad if needed) and boost it that way. Might get noise though.

[mro]

Cranking RPM?

If you still need cranking rpm, I'll bring home my tacks from work and find out. (got a remote digital and a neat little tack that you can just press against a shaft)


mro

[LoserShoes]

Look into a zero crossing detector, usually built with a comparator, but can be done with an opamp, LM358 for single voltage automotive type apps.

Steve

[mainlylinux]

Yes, if you can bring home your tach and get the info that would be great.

I'll check into the circuits you guys metioned.

I just picked up a gear reduced dc motor today from work, so hopefull that will get me close to the cranking rpm.

Dan

[JWSanders]

Looking further, this seems to have the best description of how to make a Astable Oscillator (Square Wave Generator). Really descriptive.

http://www.kpsec.freeuk.com/555timer.htm#astable

[mainlylinux]

ttt

[mro]

Sorry
forgot to check cranky rpm
try to remember tomorrow and post when I get home

wrote myself a note

mro

[mro]

Cranking RPM

190 to 200 rpm

Don't know if my 80G is a good overall sample for the XSs.
Nothing to compare to yet.
Just under 17K miles and no problem starting.

mro