Sparkplugs NGK, autolites, Champions....

[TFMech]

I had the parts guy dig them all out on the counter. I just found the joy of shrouded spark plugs in a turbo dodge. I am sort of suprised that I had never ran across trying them before but I am glad I did. I always had to run 0 degrees of timing to keep the omni from pinging and if I got a cold enough plug to not ping with timeing it would blow out at 18psi. After putting these in my car and them running so well I went in search of the why they work so well when a protruding plug of the same heat range dosent work worth a crap. I had both our crew chiefs going on it today. They say that since gas burns so hot compared to other fuel with protrudeing elctrode plug it super heats the end then starts pinging then leads to cracking the porcline and bad stuff like that.....we usually let off before the real bad stuff happens....here the computer comes in and dumps more fuel in too cool it while this is happening our cars get to 18psi or so and they have so much fuel to compensate for boost with the spark plug tip so far out there it dosent fire because the tip is not hot enough. Which is why a shrouded plug is the best of both worlds a modified gas motor like ours. You can run a cold enough plug to not ping on the way up and then since the tip is shrouded it stays hot enough to stay lit even with enough fuel to run 20+ psi of boost. How cold you can go depends on your ignition my digital box has kept even the coldest plugs going at a idle. I am going to try BR10ES plugs next week. Has anyone tried out all the brands on these to see what runs better. I know there are few posts on NGKs especialy the BR9ES which I have in the omni right know. I did a little research and found that the BR9ES crosses to a champ RN2C has anyone run these with any results. NGK also makes a shrouded iridium plug in the same heat range as the BR9ES and the BR10ES. The RN2C also crosses to an autolite racing plug, and autolite copper plug. Has anyone tired running the hotter heat ranges of these in a stock turbo dodge maybe like a BR5ES or BR4ES. Let me know what you guys have found or find.

[fiater]

What's the shrouded plug?

[TFMech]

It is a plug where the electrode is down in the plug and the wire is almost straight across. They are mainly used in motorcycles, and other 2 cycle stuff. The stock plugs we run are projected electrode IE the electrode is out the top of the plug and the ground wire is arched up to the top of it.

[GLHNSLHT2]

pics?

[fiater]

yea please on the pics. did some quicky research and didn't find much (although side gapping seems pretty interesting)

[TFMech]

If you go to NGK.com just type in BR9ES and it should show you a pic. I have been doing a little more playing and mine liked the 9s with a 195 thermostate but had to go back to hotter ones with the 180 stat in it. I only had some autolites that were the same as NGK BR6ES. I am going to try some BR7ES and BR8ES's this weekend and see if they will stay running. I like the EGTs though they are only 1450 at 24psi on pump gas right now. Which means I have some cushion to play with. Yeah just go take a look at NGK.com or go to Carquest and they will have some 6,7,8, and 9 BR series plugs. They are mostly ran in Snowmobiles and dirt bikes. You can also get them Champs they are RN2C,RN3C,RN4C... and so on.

[newmember]

No kidding, the BR9ES's will fit into a 2.5 head no problem? Running the factory gap too?

[SUPER60omni]

Is there somthing wrong with your car? Whats wrong with stock plugs, or at least RN9YC's ?

[TFMech]

If you call 25psi on pump gas something wrong.....then I guess there is. I have a turbos unleashed computer and the timing map is a little aggressive for running anything close to a stock plug. RN9YCs will run if I set the base timeing at 0 and they are still on the edge of pinging. They also need to be set at .025 gap to keep them lit up anywhere above 18psi. Where these plugs I can run up to .040 gap and and I have put 6 degrees of base timing back in it and it runs great. 1450 on the EGT at 25psi and the plugs look great. I am sure if I put race gas in it it would run like a champ with the 9s in it. I built the car to run on pump fuel though. I could get an emulator and wide band and modify the chip but I dont want to waist my money on that junk when I am going to buy Motorvation fuel injection for it when I get my tax refund and it comes with a Wide Band, put some bigger injectors in it and make some real HP and probably run RN9YCs

[TFMech]

Quote:

Originally Posted by newmember No kidding, the BR9ES's will fit into a 2.5 head no problem? Running the factory gap too?

I have my set at.035-.040 it will depend on you ignition system and boost setting though. If you are running stock ignition you will probably have to drop the gap a little. As far as the fit they screw right in they are the same reach, seat and everything. You will probably find like I did that you will have to run like a BR7ES or BR8ES as the 9s are a little chilly just play with it.

[Reaper1]

Gary Donovan ran shrouded(aka: non-projector) plugs in Relentless. I have also run them(I preffer NGK plugs) and they seem to work well. For most of us the NGK 6 heat range is going to be pretty decent. I run BPR6ES(yes projectors, but I've not had a reason to swtich yet) in my car. I was running BR6ES plugs in my van(non-projector plugs), bu it was a 2.5. They worked well...

[CSXT802]

I've been using the NGK BR9ES plugs for a couple years now. I buy them by the box for my snowmobiles. I have some RN2C that I use in the sleds also.
I run the BR9ES at a .028-.030 gap 27psi on pump gas (with meth/H2o) 12 - 13 degree base time. 782 - head.

[Reaper1]

Hmm..I always figured that going much more than 7 in the NGK heat range would be too cold for dialy driver purposes. I *may* try some lower ones than my 6's the next time around. I occasionally get some light knock during part throttle, moderate boost conditions. I find it strange that it doesn't always do it, so it's not like I can anticipate it. : Possibly some cooler plugs could help the situation...

[SUPER60omni]

MSD 6AL. Problems solved. Its what I run.

[TFMech]

mine ran fine on the 9s till I put the colder thermostat back in it. Then it would foul them off I am going to try to run them again and drop the gap a little see if that helps. The thing ran the 404 autolites in it down to Birmingham yesterday and back they look like they got a little warm. I am going to try some 7s in it when we get back from racing in San Antonio next week see how they run.