Just changed my rear bank plugs, and found they were Champion RC10PYP4's. I dunno what the hell these are, but i dont think they are specified for Magnas. I found some reference to Hyundais Elantras on the web...but apparantly Magnas take RC8PYP4's.?

Thing is, this car has been serivced by a Mitsi dealer all its life according to the book, so this would suggest that the Mitsi dealer put these plugs in....go figure. :nuts:

Anyway, replaced with NGK Iridiums, put the AMC gasket kit through it and used a whole can of carby cleaner cleaning 100,000 Kms of black crap from the throttle body and plenum -and the car now drives like a dream. Lots of poke from the pedal.

Im in love with my Magna again.:D :D

Just changed my rear bank plugs, and found they were Champion RC10PYP4's. I dunno what the hell these are, but i dont think they are specified for Magnas. I found some reference to Hyundais Elantras on the web...but apparantly Magnas take RC8PYP4's.?

Thing is, this car has been serivced by a Mitsi dealer all its life according to the book, so this would suggest that the Mitsi dealer put these plugs in....go figure. :nuts:

Anyway, replaced with NGK Iridiums, put the AMC gasket kit through it and used a whole can of carby cleaner cleaning 100,000 Kms of black crap from the throttle body and plenum -and the car now drives like a dream. Lots of poke from the pedal.

Im in love with my Magna again.:D :D

The number is the heat range, what number NGK did you replace them with? all models take BRK6EIX-11 except for SC and ralliarts, they take BKR5EIX-11

The number is the heat range, what number NGK did you replace them with? all models take BRK6EIX-11 except for SC and ralliarts, they take BKR5EIX-11

The 3L (TE-TJ) has the same plugs as the ralliarts as well, they are one range colder than the plug used in the standard 3.5L.

The 3L (TE-TJ) has the same plugs as the ralliarts as well, they are one range colder than the plug used in the standard 3.5L.

Yes, due to not having the EGR, and the ralliart had colder because of the higher compression.

Yes, due to not having the EGR, and the ralliart had colder because of the higher compression.

Also more ignition advance on the ralliarts, the .4 of one compression point didnt really require the colder plug but during testing it was decided to use them anyway (i really enjoyed being payed to thrash these engines till they died all in the name of durability testing :badgrin: )

Also more ignition advance on the ralliarts, the .4 of one compression point didnt really require the colder plug but during testing it was decided to use them anyway (i really enjoyed being payed to thrash these engines till they died all in the name of durability testing :badgrin: )

Haha nice.

Also more ignition advance on the ralliarts, the .4 of one compression point didnt really require the colder plug but during testing it was decided to use them anyway (i really enjoyed being payed to thrash these engines till they died all in the name of durability testing :badgrin: )

what parts did you have problems with letting go?

I hear champion plugs are rubbish anyway - so the further they are away from my car the better!

Surprised there was champion in there but having said that I have seen these before, on a car I know for a fact had never been touched so these had to have been mits fitted.

Perhaps there was a supply issue so Mits fitted these instead

You are better off not driving than using Champion plugs

what parts did you have problems with letting go?

While i was in that section we had a couple of 3.5 engines do the piston skirts in and the odd rocker let go on the hot/cold durabilty dyno tests but overall they were pretty reliable.

We also had a few 3L throw a rod (or two) and the occasional big end bearings getting hammered out but that was mainly due to being loaded up hard on dyno runs.

The best one i can remember was a very very early ralliart build up (10.1 comp etc) being screamed hard on the dyno for a few hours when the oil filter blew off and sprayed oil all over the exhaust..... nice smokey fire ball that was, thank christ for the good fire extinguisher system we had in the dyno cells. lol

What does running colder plugs do?

For example, if you had BKR5EIX-11's in a stock TJ 3.5 (instead of BKR6's), what would happen?

Colder plugs dissipate heat quicker from the tip so are suited to higher comp ratios etc and are less likey to cause pre igntion,detonation etc,basically any mod that will increase the combustion temps will/can benefir from a cooler ranged plug,but if you have too cold a plug and have oil control ring or valve stem seal issues you are going to cause problems with missfires etc,as the plug tip wont get hot enough to burn all this oil and crap off,so they wont give performance as such,but allow more scope for tuning

Steve

Does a colder plug in a standard motor 3.5 motor have any effect on power and ecomony?

in a word,id say no