I've just been looking on this site for a trigger wheel suitable for fixing to the crank pulley on my x-flow.

Can anyone suggest the best size to go for?

cheers,
David

dunno but I know a man who would.

you need to figure out where you will fit the sensor, that'll decide the diameter surely?

if you mount snsor on slots for adjustability, then you don;t needthe more expensive slotted wheel .... and even so, I think you can adjsut in software any offsets.

All you have to do is ask

4.5" is what you want on an xflow. Ford did see fit to make the odd few engines that need other sizes but any xflow that you're likely to be using in a locost will want the 4.5" one.

If for some reason the 4.5" one doesn't suit then we always let people swap them as many times as they like for the cost of the return postage. Provided of course that the one you're returning hasn't been hacked around.

I don't want to turn this thread into a commercial so I'll shut up now, but if anyone has any queries about the trigger wheels drop me an email offline.

Chris ( sales@trigger-wheels.com)

Ta muchly - I'll be in touch sometime soon...

David

4 and a half inches is what we've used.
Fits well with a 4 inch steel pulley.


Picture here

[Edited on 20/7/06 by UncleFista]

I can thoroughly recommend Chris / trigger-wheels.com - ordered one at 1:15 yesterday afternoon and it arrived at 7am this morning. Good quality item too. Did get me out of bed though so it's not all good, could you try to arrange for about half eight next time?

I'm afraid I don't have any control over the postman. If you have a particular aversion to having your door bell rung, then next time let me know and I'l send it standard post rather than recorded.

quote:

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Originally posted by UncleFista
4 and a half inches is what we've used.
Fits well with a 4 inch steel pulley.


Picture here

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On the crossflow the easiest thing to do is to let the central crank bolt hold it in place. Then either drill a hole through the wheel and into the pulley for a roll-pin or drill and tap for a (threadlocked) M6 bolt. That will guard against the pulley ever rotating but will still allow you to move it around if you move your sensor or want to change the trigger angle.

Does that work with a bog-standard pressed steel pulley?

Before anyone says anything, I know the general opinion is to replace the standard pulley with a solid steel job, but I don't rev the engine much higher than Ford intended.

David

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Originally posted by David Jenkins

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taking the thread in a slightly different direction .... but I have wondered why is it not possible to machine the slots in the crank pulley itself?

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but I have wondered why is it not possible to machine the slots in the crank pulley itself?

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quote:

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Originally posted by 02GF74
taking the thread in a slightly different direction .... but I have wondered why is it not possible to machine the slots in the crank pulley itself?

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Ok - I've now got a steel pulley wheel and a 4.5" trigger wheel (I knew I really ought to have changed the pulley before this... but I'm too tight! This was a good excuse).

I know the sensor has to be mounted at the correct point when the crank is 90 degrees before the TDC mark. I also know that the sensor can be mounted anywhere convenient, as long as the missing tooth bit passes it at the correct time in the rotation.

However, what I don't know is what's the significant part of the trigger wheel as far as the sensor's concerned - do I set it all out so that the gap passes the sensor at 90 degrees BTDC, or the leading edge of the next tooth, or the middle of the next tooth?

David

The centre of the missing tooth should be in line with the sensor.It is desierable to have it as near as posible to get the 10 degree basic timing, but in practice you will be mapping the engine to run at its best and the actual advance wil be set to suit your engine from the base setting.
Paul.

Thanks for that - although I will be making the sensor mount with a little bit of adjustment, and the map can correct errors, it's still nice to start off as near to correct as possible!

David