Author Topic: Starts in 2 revolutions of the crankshaft  (Read 2532 times)

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Offline Mute

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Starts in 2 revolutions of the crankshaft
on: August 16, 2016, 12:00:57 AM
Tonight, because i had nothing better to do, well except finish the living room DIY, replace the sealant round the bath etc. etc.  :151: but nothing "better" to do  :164: I skived off to play with my new AC DC current clamp. Testing AC was easy but testing something meaty and DC, only thing i could come up with was a starter motor.

The s1000xr is the fastest starting engine i've seen. Feels like it's almost instantaneous when you hit the starter button. I measured how many rotations of the crankshaft it takes to catch.

2 rotations  :008:



I clearly canny work my chinese scope so the screenshot turned out to be of a clipped view! The peak inrush current was 400amps. The 4 spikes at 5.5secs are each cylinder's compression stroke. The ghosty spike at 2.5secs is the fuel pump - 125amps inrush seems high to me but around 6amps running at 3 secs seems fair.

Anyway,  :455:  :008:

#1

Offline Troppo

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Re: Starts in 2 revolutions of the crankshaft
Reply #1 on: August 16, 2016, 08:46:11 AM
That's impressive.  It does catch quick, that's for sure...

#2

Offline Flashman

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Re: Starts in 2 revolutions of the crankshaft
Reply #2 on: August 17, 2016, 03:49:51 PM
 :460: Love it!

#3

Offline mahseve33

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Re: Starts in 2 revolutions of the crankshaft
Reply #3 on: August 17, 2016, 09:18:34 PM
Certainly quicker than the oil can get back into the camchain. :008:

#4

Offline RichS1000XR

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Re: Starts in 2 revolutions of the crankshaft
Reply #4 on: August 17, 2016, 09:29:53 PM
Wow, you really were bored! :745:

#5

Offline Troppo

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Re: Starts in 2 revolutions of the crankshaft
Reply #5 on: August 17, 2016, 11:24:38 PM
*Originally Posted by mahseve33 [+]
Certainly quicker than the oil can get back into the camchain. :008:

Hahahahahah.  Oh dear....