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MG MGB GT V8 Factory Originals Technical - Ignition coil and Distributor
|I have a 3.9 with the original electronic ignition with the amp mounted on the outside of the dist. What coil works best with this system or should I replace the dist with a unilite and upgrade the entire system.|
|You can mess around with ballast resistors and a 6 volt coils, but it's not quite strait forward because as you must be useing a SD1 starter (because solinoid is on the bottom) , you almost certainly don't have the ballast resistor terminal (check ,I could be wrong, you're looking for a second small terminal in addition to the usual two large and one small). But since it's EFI you'll never have trouble starting so use a 12v coil as I did. This coil was scavanged out of my old '85 subaru so it's a nothing special generic 12V coil. I've mounted it RHS forward in the cooler part of the engine compartment away from the exhaust manifolds and it works perfectly.|
I went with a MSD pro billet distributor (Buick Billet Dist. , 215, 300, 340, 350 PN 8548*) and 6AL box with a MSD Blaster 2 coil as well.
|Michael S. Domanowski|
|stock Buick Delco with Pertronics and almost any coil. With the Rover front cover, you will have to change to either a Buick front cover or the oil pump shaft from a Buick to mate with the GM dizzy. Towery or D & D should be able to fix you up. The very early Rover pump shaft may work, not sure.|
No more points & condensor to fool with, cheap Chevy cap.
|Changing the front cover at this point is impossible as I just had custom pullys machined and I've got everything lined up. I am interested in replacing the Lucas electronic system with the pertronix and using a MSD coil. Does anyone have experience replacing one electronic system with an aftermarket unit. I also checked into the MSD dist and ignition but there has to be a less expensive alternative.|
I got my MSD setup from JEGS, I had to wait cause they don't stock the Pro billet distributor but it was half price compared to a local speed shop. I got everything in about 3 week. I believe I paid less than $500 for everything, distributor, and 6 AL Box and Blaster 2 coil in chrome.
If you are in NY you are welcome to come by and check out my setup. I'm in Rockland County. e-mail me for details.
|Michael S. Domanowski|
|Why would JEP need to change the front cover? It sounds like he has a pre 95 motor. Wasn't the 4.2 the only one with the crank driven oil pump and a disti/amp configuration?|
|All the Rovers prior to the serpentine front cover have basically the same cover as the Buick/Olds, & are interchangable. The difference is in the oil pump drive chaft. The Buick shaft has a notch (female) & the Buick dizzy has a tang (male) that engages the pump shaft to drive the pump.|
I think some/all of the Rover setups are the reverse with the dizzy being female & the pump shaft being male.
As I posted earlier, I think you can replace the Rover gear & shaft with a Buick part, but hoped that Glann Towery or others would chime in with confirmation.
|Buick stock delco with pertronix ignitor, pertronix coil, no ballast resistor, swap the Rover oil pump drive gear to the Buick ditributor shaft, no front cover change needed.|
|Thanks for all the help. I have a 1991 3.9 that is brand new. I retained the original front cover and water pump but changed the flange on the pump to accept a standard pully. the dist is original rover with the amplifier on the outside. The pertronix seems like the way to go for now. I need to get the engine to run before I make any changes.|
This thread was discussed between 10/01/2004 and 17/01/2004
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