GM HEI small cap cam sync conversion?

[Bullshark]

I just purchased the Accel DFI Gen 7 ECU and a universal un-terminated harness for my RamJet 502. My preference is to implement seqential injection, but before I spend the jack to by the Accel dual sync distributor and an ignition control box (which I have very little room for), I want to look into coverting the GM small cap HEI distributor to accomodate a cam sync capability. Anyone ever done that? or know how? Bullshark

[tjwong]

Originally Posted by Bullshark

I just purchased the Accel DFI Gen 7 ECU and a universal un-terminated harness for my RamJet 502. My preference is to implement seqential injection, but before I spend the jack to by the Accel dual sync distributor and an ignition control box (which I have very little room for), I want to look into coverting the GM small cap HEI distributor to accomodate a cam sync capability.

Anyone ever done that? or know how?



Bullshark

You can grind off 7 of the 8 pole peices in the magnetic pick up. But in order to get fuel SEFI injection you will still need a crank sensor input, which will have to be a 4x signal from the crank. Its really much easier to use the dual sync and be done with it. I have them if you need them. Or you can run conventional bank to bank injection and just use that GM distributor as is. There is no power gains to be had from SEFI injection. It does however offer a bit better tuning resolution when one has a more radical cam.

[Bowtie8]

Originally Posted by Bullshark

I just purchased the Accel DFI Gen 7 ECU and a universal un-terminated harness for my RamJet 502. My preference is to implement seqential injection, but before I spend the jack to by the Accel dual sync distributor and an ignition control box (which I have very little room for), I want to look into coverting the GM small cap HEI distributor to accomodate a cam sync capability.

Anyone ever done that? or know how?



Bullshark

When I was looking into this about 2 months ago. I opted for the Crank Trigger and IPU from MSD. The dual sync is by far the easiest but, I wanted the accuracy of the crank trigger. Not sure if it offers much advantage to the dual sync. I almost went dual sync route until a friend of mine gave me a new crank trigger which swayed my decision.
If you do the crank trigger. you will have to find bushing to move all your acessarys out 0.300 for MSD Its a PITA but there is enought room with the rack.
The sequential is a nice option and can offer drivability improvements but you will need temp sensors in your exhaust primarys to dial it in. I dont believe it will offer much WOT improvement.
I have it but have not touched the tuning because I don't have the bungs in my headers and a datalogger. Maybe when the turbos go on.


If I was to do it again, I would put a dual synch in.

Good Luck

JW

[VanSpeed]

I have no experience with the crank trigger systems or converting to the dual sync distributor. I am considering these options as I move forward with a new engine combination for my 1985 track Vette. The crank trigger that is offered by Exotic Muscle, see link below, came up on another thread previously and looks like a good way to go if one wants to use a crank trigger on a L98 C4. No spacing of the front accessories required with the EM kit. Just thought I would share.

http://www.exoticmuscle.com/vette/images/C1306.jpg

Brian