US Cars from '73 up, looking for Anti Hop Device for documentation

Adrian,
Interesting that you should ask. I have also been trying to trace the circuitry for the ignition retard switch and the air pump clutch module. I managed to figure everything out, except for the inside of the Anti Hop device. I did not want to pry it open for fear of damaging the case, and I was thinking about putting in a similar request on this forum, so that I could disect it. Now, if you can get one and take it apart, perhaps I don´t have to! I could let you borrow my module if you are unable to find another one. If you think it can be opened and re-sealed without problems, I could even open it up and document it for you. But I suppose someone will have one lying in a parts bin somewhere. Most of them have been removed, or at least disconnected by now.
I am sending you a couple of photos of the modules in my car to your email address.

By the way, the wiring diagram on your website is absolutely beautiful! Thank you for making it available! The only thing one could wish for would be a similar diagram for the US version. If there is anything I can do to help you getting such a diagram produced, please let me know.

Lars



Note:
For the benefit of those who are not familiar with these devices, the Anti Hop device (cute sounding name, probably a translation from Italian) is a module between the micro switch on the throttle linkage and the second set of (retarded) breaker points in the distributor. The micro switch retards the iginition timing when the throttle is in idle position only. The purpose of the module is to prevent the ignition from being retarded when the driver briefly lifts the gas pedal, such as during an upshift, hence the name Anti-hop device. It may be as simple as a delay relay circuit inside (a relay with a capacitor and resistor), but we do not know (yet), because it is shown only as a black box in the factory wiring diagram.

 

McCann's site shows a used one for $45!

 

installed after market dino plex in 103 case and do not know what to do with the black lead. Also installed the petronus? igniter. Connected the tach wire to the negative side of the coil, it measured 8 volts so was not worried too much about about excess voltage since ballast resistor steps down voltage to ign coil. The tach works fine. I believe the black lead from dino plex is to trigger tach but I am not sure. What do I do I with the black lead. It measures 8 volts also.

Last but not least, used a snap- on timing light to set ign timing then started to check the advance of the distributor. I think, since advance was excessive when I dialed in 36 degrees, thet there must be a formula to dial in the proper advance. Intuition tells me in a 4 cyl engine you would dial in one half of the advance that you would on a v-8. No instructions w/light and no one uses them any more so most forgot includig me.

talk to you soon
clay

 

Is this the microswitch that is mounted using two of the valve cover attach points? I might have an extra

 

I would call Dennis & Norma and give him the part number from his website:

350331 HOP DEVICE RELAY SSM1B, DINO 246 US VERSION (MARELLI # SSM1B)(USED).

Phone calls work better than emails.