4 replies to this topic

[Capt_S-R2]

Hi guys, I've rolled my mpi out of the den for the summer and I wanted to replace a few minor bits, the one I'm stuck for choice on is which plugs and leads are worth trying.

It's highly tuned, 1380 mpi swift tune road rocket, secondary programable ecu throwingout around 100bhp at last tune session, but that was a few years ago.

Anyones findings with specialist plugs or leads or more mainstream ones I'd love to hear.

Cheers

Capt S

[mikespicooper]

Hi guys, I've rolled my mpi out of the den for the summer and I wanted to replace a few minor bits, the one I'm stuck for choice on is which plugs and leads are worth trying.

It's highly tuned, 1380 mpi swift tune road rocket, secondary programable ecu throwingout around 100bhp at last tune session, but that was a few years ago.

Anyones findings with specialist plugs or leads or more mainstream ones I'd love to hear.

Cheers

Capt S

Hi there,
Original equipement plugs are the NGK plugs with code BPR6E the best alternative is the CHAMPION plugs with code RN9YCC.
One issue is the distributorless ignition which needs to work with resistor type plugs. I use RN9YCC on my spi cooper which also needs resistor type plugs and in my opinion is better than the OE NGK plugs and last longer.
For your exotic 1380 MPI there are some 'gold palladium' NGK plugs with recessed electrode nose which are used for road/rally applications and those are B8EVX and B9EV bit cheep but very good!
Now about HT leads i think you should try 8mm high performance silicon leads from minispares Prt.n:C-27H7779 or from minisport you can find the prospark and splitfire leads which are also a good buy.
Hope that helps!
Mike

[bluedragon]

I have used the NGK Iridium plugs (can't recall the model number right now) with good success. I can't say they are superior to copper in operation, but they should last longer. After a proper tune-up (adjusted valves and replaced stock-type plugs, which actually still had a decent gap) the car could run on mid-grade fuel, whereas it required high-grade fuel before. Probably the valve adjustment had more to do with it (though the valves weren't that far off either - I adjusted them, but the existing gap didn't alarm me and in a pinch I would have felt OK going another 10000 miles on those valves.)

I use Magnecor KV85 leads, very happy with these. It seems to me though that with such short leads for the MPI, a decently constructed wire should suffice, no need for exotic designs or materials. They aren't subject to extreme heat. Just make sure they soundly constructed to prevent moisture entry, and electronically shielded so the ECU and other gear doesn't experience interference.

[Capt_S-R2]

Mike & bluedragon, thanks very much for such detailed answers, really glad I put it out there.

Thanks very much.

I'll see what I can get hold of and what my budget will stretch to.

Cheers

Capt S

[Dylan8660]

Have a good look at splitfire plugs, I found that my (stage 3) engine was smoother and more fuel efficient than with oe ngk plugs.