here is a comparison of the parts i took off of a car at the wreckers (ford escort) and the parts I found at NAPA auto parts


the bigger diameter wheel is a "wrecker" part and the sensor @ the 3:00 position is from the same car

smaller wheel and sensor just past the 1:00 position is are the new parts

obviously, the wheel will have to be modified to fit the /4 and a bracket will be needed for the sensor.

When I get back in a week from vacation, I will modify and mount the trigger wheel and make a bracket for the sensor....if there is any interest, I'll make a few extras for a small fee....currently I know I need to make at least 2 more, one for James Montebello and one for Jerry in Pleasanton (sorry cannot remeber your last name right now, )

NAPA part numbers are:

CSS304 wheel
CSS411 sensor

now for the rest, you are on your own, hahahaha

opps, forgot "something"

and:

Excellent. Thanks Mike. That new part looks a lot lighter, too, with all of the lightening holes. Bet it adds 10hp!

no problem, I figured I "owed" you one since I've been hogging the LM-1 so much

I won't need it for awhile. Waiting on a new rev MS kit to show up, and I was hoping to park the car for awhile to piece together the partial D-Jet stuff I have, but the Mini is making some new noises, which means the 914 has to stay mobile so I have something to drive. Foolish me, trying to rely on 30-40 year old cars to get around...

Hey Mike,
What are ya gonna do for the pully allignment? I am getting the parts together for a /6 version right now. I promise to share all of the info. I just got some advance tables for a 2.7 with SC cams...ooohh ya! Brent Picasso's kit is looking pretty easy. I am just waiting for the board and chip, I got everything else already. What curve are you programming in? I cant wait to figure out how to mount it (not a machinist). Gonna have to do some begging.
Yeah,
Mike

On the Type IV, there's a spacer between the fan hub and the fan, which this trigger wheel will take the place of (perhaps with some machining to adjust thickness). I have no idea what you'd do on a 911 engine. I suppose you could shim the alternator pulley to space it out the same distance the crank pulley will be moved out. Or just mount the wheel outboard of the crank pulley and made a suitable sensor bracket.

I'm working on this right now. What I did because I needed a new pulley anyway is call Richard Clewett. I ordered a new pulley, Electromotive sensor mount and the Electromotive sensor. I did this as Clewett already has a pretty nice mount that bolts on to the distributor stud on a /6 and from my research on the web and talking to clewett I believe the e-motive sensor to be a VR. Right now I'm working on a trigger wheel which will bolt on to the mounts Clewett has in his wheel.

Another way to do it would be to have the notches machined into your current crank pulley. Someone has already done this with a non-pcar so this should be workable, and a lot cheaper. For my design, I have 36 teeth right now, and will just cut off the tooth where I need to in order to get the proper sensor/pulley alignment.

Adam,
I would not be able to cut the notches in my pully as I would have to "eyeball" it using a dremel (low probability of success). As for the premanufactured parts, I am assuming that that prices of those items would be prohibitive (could be wrong). As it stands, I have spent less than $100 for this set up and all that is left to do is assemble (easy for me) and figure out a mounting rig (not as easy) An external mounted wheel may be inthe picture, but I'll bet that I can shim the alternator pully. IIRC in Waynes book the picture has the wheel internal so this must have already been resolved by someone. I would possibly be interested in the bracket you spoke of, do you have a price for that unit? Is it sold seperately?
Thanks,
Mike

on one of the megasquirt forums, a guy posted a picture of his flywheel which is used for the "counting"

Mike,
I wish! That is pretty clean, but probably a PITA to do R/D on. I figure my two main problems will be centering the wheel that I have, and mounting the sensor stiffly at .5mm. I will be keeping the distributor till I get it all figured out. must....drive....can't....wait....voices.....angry

It was a little pricey. $159 for the pulley, but it was only around $30 more expensive than an OEM from Pelican. $89 for the mount which was a little pricey, but after messing around with the SDS and drilling holes to mount that sensor, I wanted a bolt on setup. I would say the mount isn't really much use to you without either getting the Electromotive sensor ($40), finding another 1/2" sensor, or machining the opening in the mount to hold a larger sensor.


I know some have used ABS sensors, that might yield a junkyard VR sensor of the right size to bolt in. Or it really wouldn't take much work to make a piece similar to the Clewett piece for pennies on the dollar and use that as a base for mounting the 4-cylinder EDIS sensor that Mueller posted above.

Well, I took a look a t Clewett engineering. Here is their set up. Very nice, but potentially out of my range.
Mount = $89.60
Distributor plug = $64.00
The wheel wont work for me because it is 120 tooth (or 60) and costs at least $96.40 (hard to tell what I would need and the others cost more).

Doh! Ya beat me to it by seconds..

The sensor that I have looks like the bottom one in Mike's picture.

Well for a dizzy plug, I used a $3 freeze plug from Pep Boys. That's all theirs looks like it is as well.

Right, their wheel won't work, you need 36-1 to do EDIS which is why I designed the trigger wheel I posted earlier. You could either make a similar one and use the two holes in the factory pulley (at least that's what my stock SC one had) to bolt it on, or maybe find a similar sized ring and have it spot welded to the factory pulley. Either might work.

Sounds like a good idea.

That sounds like a great idea!

I need to save some dollars as I just got my estimate back from the machine shop about my heads...$650...Damnit!

what does the stock 911 motor pulley look like? I'd be willing to take a look and see how easily the $10 trigger wheel can be adapted to it.

it might be as simple as a few bolts to hold them together

Thanks, Mike. Thats real nice of you. Here are some pics of my parts.

more...Side profile of the 911 pully, rear showing.

close up of the wheel I got. It is much bigger than the pully, but I can get another if I need. Probably a 4cyl one would be smaller.

Adam,
do you have a picture of the $3 plug that you got a Pepboys?
Thanks,
Mike

Based on the picture, the 4-cyl wheel is smaller. My SC pulley is 131mm or ~5.15 inches, the 4-cyl trigger wheel is around 5.7". If you decide to go that way, it's around $20 at the dealer for a brand new one. Probably just as cheap and easier than scrounging at a pick-n-pull. You'll have to check to see if that extra 1/2" is going to foul on the fan housing or on the engine mount if you mount the wheel to the face of the pulley.

I just measured my wheels and sensors:

big wheel off Escort from wreckers=Ø5.66

$10 wheel from NAPA=Ø4.970

sensor from Escort=Ø.630

sensor from NAPA=Ø.5375