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Scorpio · Posted: Thu Jan 29, 2009 12:41 pm Post subject: EDIS 4 TRIGGER WHEEL

1) Is there a special orientation of the crankshaft pulley "guide pin hole" to the missing tooth section of the 36:1 trigger wheel ?

I think the guide hole represents BDC for cylinder 1 and 4, could be wrong

2) Can the trigger wheel just be drilled, tapped and bolted into the crank pulley? there is only about 3mm thickness on the pulley b4 it goes through to the belt.

_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

Rich H · Posted: Thu Jan 29, 2009 6:10 pm Post subject:

You can just bolt it up, but it needs to be dead square adn true, might be an idea to get it in a lathe and skimmed after assembly. I think the MS pages describe the offset required, I can't rememebr off the top of my head, but it depends on where your crank sensor is, I bet it's not vertially above the pulley!
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Would be better to make up an arrangement where the trigger wheel can be reindexed after installing the main crank pulley. Somebody here did this in the past, but I don't have the reference handy. I'll do some searching to see if I can dig it up. But the idea is to not lock yourself into a particular orientation by requiring the trigger wheel to bolted in a particular orientation. You may find that you need to move or change your pickup sensor, so having flexibility to reindex the trigger wheel is worth the extra fabrication effort.
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erstwhile owner of just about every 924 variant ever made

Rich H · Posted: Thu Jan 29, 2009 11:02 pm Post subject:

Good point, mine is adjustable and took a few goes to get right.
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

flosho · Posted: Fri Jan 30, 2009 1:30 am Post subject:

Maybe we could get another run of the fully adjustable 36-1 trigger wheels that CEP did for us a while back..
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[This Space For Rent]

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

I'd definitely be interested in that, but David has been hard to get ahold of (not unlike many of the other jobbers we've tried to deal with, as noted in the Cometic HG threads

).

If there's interest, I'd certainly be up for leading the charge on another group buy.

{EDIT}
Jason, do you have contact info for those guys? I might have it somewhere, but if you've got it on hand, please post it or send it to me in a PM.
_________________
erstwhile owner of just about every 924 variant ever made

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Ah, found it
http://www.924board.org/viewtopic.php?t=21387

http://www.customengineeredperformance.com

Inquiry sent to Dave.
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erstwhile owner of just about every 924 variant ever made

Scorpio · Posted: Fri Jan 30, 2009 2:32 pm Post subject:

Found it
http://www.diyautotune.com/tech_articles/trigger_wheels_installation.htm

Missing tooth location is 9 Teeth ahead of Vr sensor when engine at TDC...Does this mean it sits on top of the 9th tooth or in the gap after tooth 9??

ok it sits in MIDDLE of 9th tooth

http://www.megamanual.com/ms2/EDIS.htm

p.s just confirming...when looking from front to back, the crankshaft turns clockwise?

EDIT- ABOVE PIC SHOULD HAVE MISSING TOOTH AHEAD NOT BEHIND VR SENSOR
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

macBdog · Posted: Fri Jan 30, 2009 5:38 pm Post subject:

I have a template made up for this if you want it.

Also did those AN fittings work for you?
_________________
1979 931 with a 350 chev
1973 911E with EFI

Scorpio · Posted: Fri Jan 30, 2009 7:19 pm Post subject:

Spent the day making this thing adjustable... trigger wheel can be rotated
90, 180, 270 degrees....slots also allow for around 25 degrees within each quadrant.

Tolerance is within 0.2mm from "out of round" VR sensor sits between 0.5 and 1.5 mm from trigger wheel making tolerance acceptable

4 stainless steel hexs bolts fasten trigger wheel to crank pulley. Pulley was drilled and tapped

Macb the smaller fitting was a fit but the oil return fitting was a little small...
_________________
1979 NA
MS1..EFI..
GARRETT T25 TURBO
BILSTEIN SHOCKS
GT BASED CUSTOM BODYKIT

Brisbane , Australia
Think mean think fast
all youll see is
my Porsches Arse!!!

Min · Posted: Mon Feb 02, 2009 11:16 am Post subject:

that's your stock crank pulley? .... wish mine had been that simple to mount to.

Min
_________________
Custom means it didn't come from a box.
1980 n/a with EDIS and Megasquirt II Injection. 7 different colors and counting.