a series pulley and sensor mounting

boostedmini · Post by **boostedmini** » Tue Feb 20, 2007 1:57 am

Hi all,

i am all confused on this still.

on a mini tdc is when the woodruff key is at 12 o'clock, so do i place the missing tooth at 12 o'clock too and the VR sensor 90 degrees before that at 9 o'clock

or

does the missing tooth need to be with the VR sensor at 9 o'clock?

i think i stuffed up as i put the missing tooth at 9 o'clock with the VR sensor....

Post by **brentp** » Tue Feb 20, 2007 5:16 am

Hi,

The only thing that matters is that the sensor is X degrees before the missing tooth, *when* the engine is at Top Dead Center.

In your case, X is 90 degrees (running 4 cylinder..)

So- if you have the engine at TDC, and the missing tooth is at 12'oclock, then the sensor mounts 90 degrees before that. Realize that is's a relative thing: if you need your sensor mounted in a particular way, you can rotate the trigger wheel appropriately.

In fact, it would be best to have a trigger wheel that can be re-positioned so you can adjust for slight variances in sensor placement.

Also see:

http://www.autosportlabs.net/index.php? ... nformation

KLAS · Post by **KLAS** » Tue Feb 20, 2007 9:27 am

maybe my way will help you
http://www.flickr.com/photos/75021268@N00/159364681/
http://www.flickr.com/photos/75021268@N00/159876567/

the second pic shows the missing tooth same place as the woodruffkey slot but i couldn't use that as there was no easy way to mount the sensor. so i fittet the sensor and corrected the trigger wheel

Gilesy998 · Post by **Gilesy998** » Tue Feb 20, 2007 9:41 am

I did a mini specific guide [url=ttp://www.minifinity.com/modules.php?op=modlo ... e_ingition]HERE [/url]- but positioning the sensor in relation to the trigger is easy.
As on the MF tech guide -

On a 4-cylinder engine, the missing tooth must be positioned so that it passes the sensor at 90°BTDC. The mini-pulleys bracket and wheel allow for this and are a simple bolt-on fitment, but the other types will need properly positioning and this is a simple way of doing it -

Fix the VR sensor in it’s bracket and adjust so it sits perpendicular to the wheel. Using a socket or spanner, turn the engine to TDC, as accurately as possible. Fit the trigger wheel so the missing tooth aligns perfectly with the centre of the sensor, then, using a protactor (a cam timing disc is perfect), turn the pulley forwards by 90° or nine teeth, and fix it there as you see fit. The diagram below shows the engine at TDC if the sensor was mounted perpendicular to the piston stoke: The green arrow showing engine rotation, the missing tooth 90° ahead of the pulley so that the all-important ninth tooth, shown in blue, aligned with the sensor.

See MF for the diagram, near the bottom.

cpountn1 · Post by **cpountn1** » Wed Feb 21, 2007 12:18 pm

Here's another way to get the same result.

1. Mark the crank pulley exactly 90 deg before TDC mark. I did this using a strip of paper and a ratio of the circumerence.

2. Align the new mark with the timing pointer on the engine. It is now set to 90 BTDC.

3. Decide where the sensor fits best on the timing cover and mark its approximate position on the pulley.

4. Remove pulley and attach trigger wheel with the missing tooth at the mark you made in point 3. Refit wheel.

5. Align 90 BTDC mark as in point 2.

6. Fabricate bracket to position sensor so it sits exactly in the center of the missing tooth gap.

I did it like this on my V8 (50 deg BTDC rather than 90). Mind you I've yet to drop the engine in and fire it up!

Regards,

Cliff

boostedmini · Post by **boostedmini** » Wed Feb 21, 2007 10:07 pm

thanks heaps guys, you have all helped me out, there was just and is so many ways to do it with the same result and i was confused.

thanks again

Grant

fikus01 · Post by **fikus01** » Thu Feb 22, 2007 7:45 pm

Klas that picture is exactly what i was planning to do, where did that wheel come from and any pictured of the wheel on the pulley before fitment??

KLAS · Post by **KLAS** » Thu Feb 22, 2007 8:00 pm

it is from a 2,0 CVH Ford Sierra, or something like that. i took the complete pulley and removed the damper and everything that didn't fit the Mini pulley, just a little bit of work at the lathe and everything fits.
sadly that kind of engine is very rare over here, just found this single one at the scrap yards, and the pulley is very expensive new, nearly 300€
now i use a custom made wheel that is just spot welded to the pulley for my other engines

edit: the only other pics i have are uploaded here

http://www.flickr.com/photos/75021268@N00/

Post by **brentp** » Fri Feb 23, 2007 6:02 am

Hi All,

I created an animated graphic which illustrates the relationship between engine Top Dead Center, sensor, and missing tooth. Hope it's helpful!

http://www.autosportlabs.net/index.php? ... nformation

fikus01 · Post by **fikus01** » Fri Feb 23, 2007 7:01 pm

thanks KLAS, top notch exactly what i needed to see, plus that cooper s supercharger idea was also floating in my head. awesome looking project! hope it all goes ok!

fikus01 · Post by **fikus01** » Tue Feb 27, 2007 11:03 pm

ok klas, quick question, what did you attach your wheel to on the rear of the mini pulley?? is it mounted to the flexible part of the wheel?? it looks like its solid mounted to an extra ring on the inside of the wheel! my wheel hasnt got that! hard to tell otherwise from your pictures.

KLAS · Post by **KLAS** » Wed Feb 28, 2007 9:32 am

i took the Ford pulley and removed the damper. then you have the trigger wheel with a metall part that looks like a bucket, with nearly perfect offset to fit it to the rear of the mini pulley. the newer mini pulley have a pressed steel part at the back, fixed with 3 rivets. i removed that and used that 3 holes to fit the triggerwheel

hope this helps