SRC 475 firing order

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gozos
Posts: 49
Joined: Thu Jun 01, 2006 6:23 pm
Location: Belgium
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SRC 475 firing order

Post by gozos »

Hello,

for those who do not know the SRC475:
http://www.kerloclassic.com/kerlo-resta ... 09&idref=2
The sound:
https://www.facebook.com/14892708113680 ... 9482154511
Image

What do you think of the 3x 120° firing order?
Do you think it is more reliable for the crankshaft?
www.goosse-engineering.com
VFR 750 91
NS400 1985
VOR 530 mx
VOR 400 en
CRF 510 SM

Sorry for my English :d

Channel Hopper
Posts: 1326
Joined: Thu Sep 23, 2004 5:26 pm

Re: SRC 475 firing order

Post by Channel Hopper »

A 120 firing cycle is going to induce a rocking motion on the crankshaft, not enough to be worrying, but other manufacturers have stuck a balance shaft in the lessen the effect.

Only Laverda from memory made a 180 degree triple, but that was a four stroke and was created more by accident than design, something to do with the factory tooling at the time. I don't recall it having any shortcomings but it was replaced with a 120 crank later in life, meaning one more set of points and spark coil.

You will have the same additions on the 475, which will add complexity (and weight ) to a racing thoroughbred. The V configuration of the barrels along with a 120 crank means a very strange firing cycle (0-30-240, or perhaps 0-210-240 ) either of which will provide a unique sound from the pipes, even more than the standard 400NS.

Can you post a picture or two of the pulse sensor side of the engine ?

gozos
Posts: 49
Joined: Thu Jun 01, 2006 6:23 pm
Location: Belgium
Contact:

Re: SRC 475 firing order

Post by gozos »

It is the firing order at 3x120°, not the crank.
You can see the sensors in this video at 2:56:
https://youtu.be/YffuLszLi6Y?t=176
www.goosse-engineering.com
VFR 750 91
NS400 1985
VOR 530 mx
VOR 400 en
CRF 510 SM

Sorry for my English :d

Channel Hopper
Posts: 1326
Joined: Thu Sep 23, 2004 5:26 pm

Re: SRC 475 firing order

Post by Channel Hopper »

Ah, I misunderstood. So two pulse sensors only 120 degrees apart on a 90 degree V triple engine (or is there a third sensor hidden above the generator ?)

If the former the crank must have been a 30 degree offset pin on one barrel unless there is some other trickery going on, a programmable but fixed cycle delay in the CDI unit perhaps

gozos
Posts: 49
Joined: Thu Jun 01, 2006 6:23 pm
Location: Belgium
Contact:

Re: SRC 475 firing order

Post by gozos »

There is a sensor at its original place...
www.goosse-engineering.com
VFR 750 91
NS400 1985
VOR 530 mx
VOR 400 en
CRF 510 SM

Sorry for my English :d

Channel Hopper
Posts: 1326
Joined: Thu Sep 23, 2004 5:26 pm

Re: SRC 475 firing order

Post by Channel Hopper »

Please post again in native language and I'll try to translate here

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