21 replies to this topic

[The Matt]

Hiya!

I am trying to source a pulley for me megajolt kit and have a question.

I can get my brand new crank pulley machined at a local machine shop (probably cheap, through work) but need to know where the missing tooth sits in relation to the woodruff key cut out on the pulley. Does anyone have a piccy of one that they could post up?

From what I have read I think the missing tooth needs to correspond with TDC, which means it would be inline with the woodruff key slot, no??? Then I mount the pickup 90 degrees before that?

One other thing, does the pulley need re-balancing once it's been machined?

I thank you please!

[fikus01]

from memory it sits at 90degrees btdc and tdc shud be marked on the pulley! im sure if u sk on the megajolt orum sum1 will tell u in no time

[Sprocket]

Missing tooth at TDC and sensor at 90 degrees BTDC

[fikus01]

knew 90degrees comes into it somewhere

[The Matt]

Okies, will get it machined locally. Thanks guys.

[The Matt]

Just done a quick draft of this and thought it may be of some use to people (that's if it's right)!

PM me or email me if ya need a CAD copy of it.

[The Matt]

If ya print it so the rectangle is full A4 size, it should be to scale (unless JPEGing then Photobucketting CAD piccies stretches em at all)

[Bill USN-1]

As another alternative.
If you have a piece of sheet metal and some tin snips you can make your own.
Or they are premade for about 13GBP.

You can also see that one of the examples is an A series motor pulley.
You could make it slightly larger then the pulley and face it in or out as need for space.







http://www.kimmins.info/

Edited by Bill USN-1, 06 February 2007 - 05:13 PM.

[The Matt]

Cheers for that Bill. Is my gap tooth in the right place then? It looks like it's not from those piccies of yours

[The Matt]

aaah, could just have a different pick-up location I guess!

[Bill USN-1]

aaah, could just have a different pick-up location I guess!

I would determine where you want the pick up first and then position the notch according to that.

I machined the pulley on my GM DIS conversion in the miniengine forum.
And I ended up making 2 pulleys because the first ended up placing the pickup straight down at the motor mount!!
So I moved it to the 9 o'clock position and made my brackets there.

[The Matt]

Yeah, I am having it on the front of the toming cover on an adjustable bracket, it will be 90BTDC there. I am confident that it's OK to go in that position because the bracket should give me a good bit of adjustment. It's yet to be made up though!

I am going to do a review/guide when I fit it all to the mini too. Loads of photos and CAD drawings of brackets and stuff shall be on there. Any further info from other sources is more than welcome too (thanks for the input so far).

[Sprocket]

I Have one of these

http://www.specialis...odCategoryID=17

Why not try these?? Other than cost??

http://www.turbomini...p...vt&tid=7423

Edited by Mini Sprocket, 06 February 2007 - 08:08 PM.

[The Matt]

I've emailed mini-pulleys like three times over the last few weeks and had no response, so I thought I'd have a go at gettin it machined meself. The SC one looks cool though, very similar to the KAD one.

I have also heard talk of a MED one.

I think I will do a review full of links for places to get the kit etc and pin it somewhere or put it in the FAQ section.

It's made for interesting reading over the last few weeks! I didn't even know what 'wasted spark' meant before I started looking into this stuff!

[vasi]

A couple of other methods to consider.

I have the damper off mine atm waiting to go to the machine shop. £10 will have it turned down to fit the freshly-baked-off alloy toothed ring from an 1800CVH.
This seems to me to be a much neater and less labour costly method.

Alternatively borrow / buy / steal a cheap pillar drill and using a decent cobalt bit, low speed and plenty of 3in1, do it yourself!