stock coil and msd
 

Will a stock coil, (Bosch-black) work with an MSD or do I need to buy a new coil? The coil I have was purchased this past summer so it is still like new.

I heard that the stock coil won't work. But that could be internet bunk. I sold my coil to pay for the new MSD coil.

Which MSD coil did you go with? I'm looking at the 8207, and 8222.

total hear say., but the cd coil is very different from the bosch blue(pca board?) something about milliamp rating. i'll see if i can find the info.



sorry, could not do the link. pca.org tech questions 65-77 electrical cd question


cd coil takes a 400v hit.

Go Bosch Blue. It's a safe bet. I have that combo and it works great.

Roux...I guess a few different coils will work. but the prefered coil of a very experienced 911 pro around here is the MSD high vibration coil.. and I try to note every word he says.......Ron

Second to Ron's advice... (and probably from the same source) use the MSD "High Vibration Blaster 3" coil that matches the unit. There have been some threads in the past about problems with MSD units "cutting out" or "missing" at high RPM's that were traced to coil problems.

In 101 Projects, Wayne says to use the Blue coil when converting to MSD. That’s enough for me.

I used the Blaster II but I mounted mine upright. It said not to mount it upside down. The Hi-vibe unit can be mounted upside down.http://forums.pelicanparts.com/uploads/coil.jpg

I have the High Vibration MSD unit mounted upside down in the factory position, works great! ;)

Odd.....the MSD and high vibration coil cutting out and recommended by so many. Im just wondering why I see so many cars with crank fire and electromotive systems at the track. Im sure all those people arent making a costly investment just to buy problems....;)

Thanks guys,
I just scored a brand new in box vibration coil for about $20.00, I should be able to sell my bosch to cover the costs. Too bad I have to wait until next spring to try it.
We're in the middle of a NorEaster here right now. Gale force winds, snow, sleet, and the worst, SALT. But you know what they say, everything has a silver lining. But then again so doesn't a casket.
Time to go out and work on the winter projects for the Pcar.
Again, thanks for all the info.

I need to be educated: is there any benefit to replacing a functioning stock ignition with a MSD?
I see a lot of folks on the board doing it. Does it make a noticeable improvment in performance?

No not really a noticabe difference. Maybe less plug fouling while my car warms up (going down the driveway). I did it for several reasons. I needed a rev limiter when I changed motors. My stock SC limiter didn't work right when I changed motors. I also need to move the coil when I intercooled my motor. So I thought that it was a good idea. And pretty red color. ;-)

The MSD fires multiple times over a 20degree crank rotation for each cylinder. This improves low end - below 3000 rpm - running performance, by reducing plug fouling and missing - especially in stock, older (aka richer running) MFI cars and modified engines. The high vibration coil is recommended, but is not always necessary, as a solution when and if a high speed miss is caused by stock or non-MSD coils. I suspect that crank fire units are popular for track setups because the rev range in racing is fairly constant (high - steady state) as opposed to street or hi-perf street setups. MSD is like most car stuff - some experts swear by it and some experts swear at it.

I figured out the other advantage to crank fire and electromotive systems at the track is customisable ignition.

Rouxzy's thread turned into a good one.. it would be a delight to map your own ignition curve on a dyno.. or maybe even use Exhaust Gas Temps.. so how do you rig a system to service the flywheel trigger when broken down in Hick Town, USA.. flipping a coil and CDI is a no brainer.. like I need another project.. who started this crank-fire stuff anyway??................Ron
:rolleyes:

I always start the crank fire stuff Ron. If I were taking a long trip w/my crank fire system, I would have another pick-up as a spare. Kind of along the lines of carrying a spare DME relay when your on the road.

Actually I have two coil packs, that fire from one crank pick-up, and I carry a spare pickup.. seems like I have extra levels of redundancy if something breaks in Hick Town USA

:p

Don't get me wrong - I want crank fire too :D

But MSD to replace broken Bosch CDI is pretty cheap (shop around). Used CDI is not.

Start from scratch crank fire isn't either - but from what I have seen it starts to make sense when you need a new dizzy too.

well..after some neuron activity I figure a crank fire isn't in my thoughts anymore.. even if an after market system is pully triggered..I'll never have a twin plug like Tim's, and I want the MSD to keep carbed plugs clean on the street..and a crank fire isn't an engine mgt. system..so I see no benefit... a black box, a red box. same $hit..I hate them all. and Tim, thanks for the entertainment. LOL........Ron
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