M30 Motronic 1.3 crank trigger wheel

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Healey3000

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Hi,

Has anyone taken apart the harmonic damper assembly on one of these? Does the trigger wheel separate from the rest and if so, is it just a flat plate?

I'd like to know the dimensions of this wheel, that is, outside diameter, thickness, center hole diameter and tooth width. A picture of the beast would also be most useful.

Would you have one handy and be willing to take measurements, please?

Thanks!
 
Toothy

It is one piece.... balancer, toothy wheel and pulley. 10 inches OD.Teeth are 7/32'' Thickness is 55/64'' and about 1 1/2'' with the pulley included. Center is 2 1/4'' Will not work on my A/C 1974 coupe....too big to clear the compressor bracket.
100_1747.jpg
 
Oh yeah

The other pulley, forgot about that. The engine I have was a dumpster dive and the pulley was damaged and went in the scrap bin. Been quite a while since I took the pieces off.
 
pamp said:
It is one piece.... balancer, toothy wheel and pulley. 10 inches OD.Teeth are 7/32'' Thickness is 55/64'' and about 1 1/2'' with the pulley included. Center is 2 1/4'' Will not work on my A/C 1974 coupe....too big to clear the compressor bracket.
Click to expand...

Hi,

Thanks very much for the detail. Looking at the picture, I'm guessing that the pulley and damper are one machined piece which is then elastomerically bonded to the trigger wheel. Regarding the 55/64" thickness, I assume that's teeth plus damper? How thick are the teeth alone? If my hunch is correct, the thickness of the teeth will approximately equal the thickness of the center portion where the bolt holes are.

Reason for these strange questions is that I'm looking for a suitable donor trigger wheel for a project.

Regards.
 
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Yes and no

Yes...55/64 sans pulley. The teeth are square....7/32 X 7/32. Spacing is 5/16 on the 10 inch.
The hub is 5/32'' at the bolt holes. Love to know what you figure out. Maybe sfdon has devised a solution to the A/C dilemma. Hard to measure my stock dampner in place....about 8 1/2''
 
pamp said:
Yes...55/64 sans pulley. The teeth are square....7/32 X 7/32. Spacing is 5/16 on the 10 inch.
The hub is 5/32'' at the bolt holes. Love to know what you figure out. Maybe sfdon has devised a solution to the A/C dilemma. Hard to measure my stock dampner in place....about 8 1/2''
Click to expand...

Thank you very much. Some head-scratching is in order here...

Regards.
 
Curious

As to what you are contemplating in regard to "stand alone" programmable EFI. This subject goes deep. Pay back for the work I did this morning to answer your questions, as it were. Oddly, the chevy small block uses a dampner of a similar O.D. Electromotive EFI page.
 
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Hall Effect Sensor

Pamp suggested I post a description of the timing pick up I used with the stand alone engine management system I installed a couple of years ago so I've pasted in a section below.

Edit:

Apparently that didn't work so you will have to go through this link (I hope) - the timing sensor install is in the first half.

http://www.e9coupe.com/forum/showthread.php?t=5841

More photos here

http://s54.photobucket.com/albums/g120/decoupe/EFI/?start=0

The very detailed installation manual from SDS on installing the Hall Sensor on the first 12 pages

http://www.sdsefi.com/em4f17.pdf

HTH,
Doug
 
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pamp said:
As to what you are contemplating in regard to "stand alone" programmable EFI. This subject goes deep. Pay back for the work I did this morning to answer your questions, as it were. Oddly, the chevy small block uses a dampner of a similar O.D. Electromotive EFI page.
Click to expand...

Hi,

The project car is an Austin Healey 3000 for which I plan on building an EFI system. I know there is Megasquirt, which has been a great resource but the fun of home-brewing one is too tempting to pass up. Yes, I'm sick :)

The hard part with this car is the mechanical aspects of building a suitable intake manifold that fits under that bonnet and yet has long enough runners. It's coming along though.

Regards
 
Thanks

Doug,
For your input. There is more than one way to skin the cat....megasquirt, electromotive, SDS as Doug has helpfully descibed. Delphi, FAST....I am a d-jet guy. This stuff fascinates me and I want to keep up with the curve.
 
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pamp said:
Doug,
For your input. There is more than one way to skin the cat....megasquirt, electromotive, SDS as Doug has helpfully descibed. Delphi....I am a d-jet guy. This stuff fascinates me and I want to keep up with the curve.
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Hi,

If D-Jet is of interest, this might be catnip to your tom:

http://members.rennlist.com/pbanders/ecu.htm

I think I may have posted this link in the past but I was quite amazed to find that D-jet has nary an IC in it. All the timing loops and delays are done with RC circuits. The only semiconductors in there are germanium transistors!

It is truly amazing that these units still work after several decades but one can't help but wonder how much all the timings have drifted as capacitors age. Switching to a microprocessor-based system will probably bring these cars to life.

I have my eye on a '74 Euro CSi that a friend has. It will receive a Megasquirt (or equivalent) ECU, if I have my way. In fact, I'm hoping to make a dedicated ECU that plugs into the existing D-Jet connector. Adding a mass flow sensor and other things may require more pins but I haven't thought it through as yet.

Regards.
 
pamp said:
Spotted this on u tube....
http://www.youtube.com/watch?v=LC7TL_ym-cQ
Click to expand...
Hi,

Yes, I have seen the website for this car, a very detailed explanation of each section, etc. Steve is also very helpful when asked about the car.

I'm taking a different approach than Steve. He opted to maintain the underbonnet "look" of the car and uses three injectors with the original throttle bodies. There is no intake plenum and the runners are very short, ITB style.

I'll use tuned length runners, a MAF sensor and a variable displacement plenum for a broader torque curve without sacrificing top end performance. A crank trigger wheel will provide ignition using EDIS and a cam sensor will allow sequential injection.

Lots of fun (and work)!

Regards.
 
Ac with Megasquirt installed last week at Coupekings in the black stroker project.
This is the new Coupeking AC package.
 

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A pic of the black stroker...
 

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