Crank Triggers on Roots Blown

I searched but could not find what I need to learn about “Crank Triggers.” I am building an old 2 piece rear seal, 4 bolt 350. It is a virgin bore with 3.75 stroke; .30 over and -70 SRP slugs. We converted a nice 6-71 Detroit small bore and have a good wide scope ECU and proprietary injection. We originally planned all MSD ignition components but I would like to research the option of a Crank Trigger. My concern is all the stuff going on or close to the crank, pulleys, water pump, and alternator. I am pretty sure a trigger is a much more accurate timing component, especially with an ECU, but I can’t find anyone running an old roots blown 85 block and a trigger. Even with a partial belt cage I hate to think of throwing a belt at 5 grand; jamming up the trigger and all of a sudden the plugs are deciding on their own when to fire. Can everyone say boom? This is a 36 business coupe street machine. Blowing a motor 1300 ft from a tow car is bad but not as bad as between Odessa and El Paso.

 

Not strictly a HAMB question, but here's a random thought. Don't ***ume the crank trigger has to be on the front end just because most aftermarket stuff is there.

Some European cars back in the '80s did a crank trigger with four magnets embedded in the flywheel and the pickup was in the top of the bell housing.

Today's OEMs usually put the trigger wheel inside the timing cover or inside the block.

Get outside the MSD box and there are many options.

jack vines

 

You wont throw a good 8MM kevlar belt even at 8g and if you did there is somthing else catatrophic happening out of your control. Knock the sensor out and everthing stops working anyway.

 

i run one on the street and strip on my blown hemi. the trigger unit is away from the blower belt. it goes on like this balancer then trigger wheel then water pump pulley then blower pulley. like someone already posted if you loose a belt this is the last thing i would be worried about. a simple upper belt guard will take the hit from the belt first as soon as that happens there is no more energy left. you should be fine.

 

you mean like this ?
they are easy to build with no problems...

 

Thanks so much for the pics and info.

 

Jack:
Thanks for putting me on the right track. I read through all the intro info and I wouldn't have caught that it wasn't "strictly a HAMB question." I thought this was about cars and stuff.