just woundering how many people out there use a multispark system on their rx7's

 

No real gains on a stock or nearly stock car. Once you get into high boost situations, it can help prevent the spark from being blown out. But there's no point on a stock or nearly stock car.

 

thanks because i almost bought one. But now that i know it does not much at all i'm not going to. Thanks

 

It can smooth things out a little. Idle, accel, constant speed. Maybe improve mileage, but what's the diff when you drive 80+ on the highway anyway. Eat's spark plugs like nobody's business. This is from my personal experience.

 

how many kms would you get out of the plugs? what sort of plugs do you use? i assume we're talking about CDI

 

I'm not sure about km's but I ran 12k miles accidently and they were completely toasted making the car run like absolute crap all of a sudden. The gap had to be 3 times the size of new plugs. I usually change the leads(the ones with the MSD) after 5.5k to 6k miles and they are pretty well worn by then. Just normal plugs, and I do half highway and half city as far as hours driven.

 

I had that problem before...5K miles to a set of plugs with my last motor. I switched to colder, gappable plugs, and I havent even had to touch them in the past 10K miles. (b8egv and b9egv are what im running)

 

Gappable plugs? Not the four pronged stocker thingies?

 

Yep. Theyre just regular spark plugs...

 

ouch! 6000miles for the leads.
for the B9EGVs, you need to shave some metal off the spark plug tool to fit the plugs. they wouldn't last as long as the standard plugs as they are not platium plugs. but they work well

 

Ok, so how do they run, and what gap do you use? I'm assuming by the designations that they are NGK's right? Motorcycle plugs or something?

 

yep, they are NGK motorcycle plugs, i think two-stroke.
i never gap them, i just run the gap staight out of the box. though i guess i should check

i run the B9EGVs for the lead and trailing

 

Theyre lasting WAY longer than my stock plugs did. And the car drives better too.

You will need a thin wall plug socket, or grind down a regular one. If anyone wants, I could turn a socked on my lathe for them.

 

I just installed the B8EGV (L) and B9EGV (T) on the car.
For ignition, I have a crane Hi-6R.

My experience is that the car is smoother thru out the whole RPM and power drop off is now at 8000 instead of 7600. Idle is smoother too.

They are gapped .022" right out of the box.
Bigger gap = more HP...and since I have a CDI, why not utilize it more.

Right now my plugs are gapped .03" on leading and .025" on the trailing.
No problems with it yet.

Will probably gap it more until I start mis-firing, then I'll reduce the gap a bit.

BTW, if there are anyone looking for a thin wall socket, Canadian tire has a socket tool for sale that will put these plugs in. Best of all, it only cost $3.49CDN

Cheers.

 

Hey, good info on the plugs guys. I'll have to see where I can get some around here and give em a shot. Are they more or less expensive than stockers?

 

Has anyone got any dyno runs with these things?
The unshrouded spark off the BUR NGK plugs are supposed to provide better ignition for the rotary engine design.


-Ted

 

wait so you guys are saying to stick a regular old plug in the engine so it can be gapped? like the kind with a bent over electrode in every other car? and it doesnt hit the rottors?

ok assuming it doesnt hit the rotors., have any of you guys exprimented with indexing those plugs so the spark faces up and into the oncomming air/gas charge?