MSD observations

Since there was recently a thread on how to wire up a new MSD on Boxers I thought I would just mention a few other adjustments that have proved useful on my cars. I'm sure these have been mention before but maybe worth repeating as its a cold winters night outside and I've got a nice bottle of red on the go.

1. Plugs - I've used an NKG BP6ES with gaps of .0035. I tried gap of .0050 but car stuttered aat higher revs. Just prefer the 6's to the 7's as they don't soot up as much at tickover. 5's are abit to hot. The extra gap is essential to make the most of that bigger spark.

2. Leads - Existing leads ok but check for green crud in where the leads push on to the distributor cap and where they push onto the plug entenders - otherwise that nice fat spark is lost.

3. Distributor cap - open this up and check for green crud inside and clean off .

4. The MSD 7A goes straight on with very little wiring mods (see other recent thread). Mine is connected to the starter for a constant feed rather than the alternator and has worked fine. The 7A does not have a limiter.

5. Coil - I am currently running the original Marrelli coil but recon a big improvement would be a crane blaster coil with a higher output. I run these on my 308GT4 and the result is good but difficult to strip out the exact improvement.

6. Carb jets - with the bigger spark jets can go up a couple of sizes giving a noticable thrust improvement. Went from 130 to 160 mains on my GT4 with very noticable performance difference. Can't remember whats in the 512 but they are definately bigger. My 365BB has smaller jets (don't know why ) and this is a winter project to change them.

 

Good idea about the treating the new coil as it is very visable on a Boxer. I was planning to use a crane one but could use an MSD one.