Split Fire Plug opinions sought

Post by **spl310** » Fri Nov 19, 2004 11:41 pm

Has anyone used the split fire plugs in a Roadster? If so, what are your thoughts?

SLOroadster · Post by **SLOroadster** » Fri Nov 19, 2004 11:55 pm

I ran them for a while, they worked, they also caused it to ping on hot days. They work, the NGKs work just as well. I think I heard that Split-fire was facing legal issues over something. All I can say is try them see if they work for you.

Will

Post by **mgslayer** » Sat Nov 20, 2004 10:37 am

Sid

I had them in a stock U20, and honestly did not notice a difference from the Champion plugs they replaced as part of a tuneup. But they served their purpose and I kept them in. I checked the # on the plugs, and all it says is SF40D on it. Doesn't Bosch or NGK have a plug out that splits the spark to 4 prongs instead of the 2 on the splitfire?

Happy Wrenching
Mark

hport · Post by **hport** » Sat Nov 20, 2004 5:23 pm

All,

ND and NGK both have twin electrode plugs which are platinum. Toyota uses these plugs as standard equipment, so cost is reasonable. Research the heat range and fastener type and you should be very happy with them. I haven't done this yet !

The pinging is most likely due to excessive plug tip temperatures ( wrong heat range for carb / cam set-up) This will happen any time you experiment with different plugs, tilll you find the perfect range for your engine. Remember if you try different coils and dist set ups this will happen also. Be careful of over heating the combustion camber, damage can occur.

JC

Post by **dbrick** » Sat Nov 20, 2004 10:18 pm

I was going to get the Bosch platinum 4 plugs. They have 4 ground electrodes and the gap is preset. Have read alot of good stuff. Also have a set of ND Irridum plugs which are supposed to be something new, ultra thin electrode etc etc. They were freebies.
Just got a Crane electronic conversion and coil, so will try that out too.