MicroSquirt.com read only forum (Jan.15,2018)

Hi,

I'm looking into the possibility to equip my Honda NTV650 (Hawk) with Microsquirt EFI.
The engine is a V2 - 52° with dual spark plugs (1 coil per cylinder with 2 outputs).

The engine has 2 VR sensors fitted (1&2), triggered by a 7 pole tooth wheel (see picture).





My question is how to setup Microsquirt to work with this?

Thanks for the help.
Roger

This looks like it can be driven in 2 ways. You have an 8-1 toothed wheel with dual VR inputs and it's probably an odd fire engine from the 52 deg. So it could be driven as 2 independent ignitions, but in this mode the code expects only 1 tooth and 2 sensors, as would be used with a distributor/ magneto. I wouldn't recommend this as you will lose the timing accuracy advantage of having the 7 teeth.

The second mode would be to only use 1 of the sensors and use the odd angle (2nd output channel) offset to handle the odd fire. To go further I need to know whether the toothed wheel is driven by the crank or cam.

If I remember correctly the cylinders are offset 52 deg, but the crank is also offset. If you look at the picture the pickups are more than 52 deg apart.
I'm with Al, I would go with a single pickup and use the offset on # 2.

Thanks for the reply.

The toothed wheel is driven by the crank.

According to the book the firing order of this engine is:

Front 232°
Rear 488°

old guy wrote:If I remember correctly the cylinders are offset 52 deg, but the crank is also offset. If you look at the picture the pickups are more than 52 deg apart.
I'm with Al, I would go with a single pickup and use the offset on # 2.

The angle between the teeth is 45° according to me,

looks like the first pick up is +/- 22° from top while 2nd one is at 180°

The crank is offset 60 deg, so 52 + 60 = 112 so there is 112 deg between the pickups. I would go with .
teeth-8
missing teeth-1
skip teeth-4
dual spark single crank wheel
#2 offset- 112
Use the pickup you have as #1 in the picture.
Your delay teeth will depend on which tooth lines up with the pickup when the rear cylinder is at TDC.
#1spark output would be the rear cyl. & #2 the front

old guy wrote:The crank is offset 60 deg, so 52 + 60 = 112 so there is 112 deg between the pickups. I would go with .
teeth-8
missing teeth-1
skip teeth-4
dual spark single crank wheel
#2 offset- 112
Use the pickup you have as #1 in the picture.
Your delay teeth will depend on which tooth lines up with the pickup when the rear cylinder is at TDC.
#1spark output would be the rear cyl. & #2 the front

You are getting good with this

Thanks for helping with the configuration, it can be a bit confusing...

- Bruce

Thanks for the compliment. That's one good thing about retirement' you have lots of time to screw around with this stuff. It took me a little time to get my head around this stuff,but when the light bulb finally comes on it seem's pretty easy.
I worked in electronics the first half of my life and motorcyles for the second, so the motorcycle stuff comes pretty easy.
Hope I can help more people in the future.

racemier wrote:

old guy wrote:If I remember correctly the cylinders are offset 52 deg, but the crank is also offset. If you look at the picture the pickups are more than 52 deg apart.
I'm with Al, I would go with a single pickup and use the offset on # 2.

The angle between the teeth is 45° according to me,

looks like the first pick up is +/- 22° from top while 2nd one is at 180°

looks like the first pick up is +/-45° from top while 2nd one is at 180°
Should be 45° if I look to the picture (if you aline teeth with VR 2 then another teeth will aline with VR1.

I'm I correct if I say that the VR's are 135° from each other?

Found out that Honda uses a crank offset of 76°

So this means that the VR's are in a 76+52=128° agle from each other (close to the 135° visual on the picture).