To start I just pulled all four plugs out of a race motor that was running crapily and was suprised to see that all 4 were royally ****ed. The metal arm and the insulation around the core was completely gone on one and half gone on the other 3. My though is a combination of extreme oil temp(over 250F), not high enough octane fuel(only running 93), and to hot of a spark plug(ngk platinums). Im looking for other thoughs though. I don't know how to post pics on HT but i will gladly email pictures to people. Motor is a b18c1 block with jdm ctr pistons, b18c1 rods and crank as well. head is a 1998 usdm Itr head. All stock. Exact same motor combo had arias 12.5:1 comp pistons in it with no problems. I'm stumped. Only real difference is going from mobile 1 10w-30 in the last motor to just continuing to run the break in rotella 15w-40. Fuel system is the same, just put new platinums in as opposed to running the old ones again.

 

i could be wrong but i suggest running ngk coppers not platinum

 

You shouldn't be running anything but the vpower copper plugs heat range 7 or 8 should do you well, gap to .035, if u can run wider without breaking up do so..

ctr pistons = shitty..and secondly the compression is through the roof with those pistons on that setup..

 

ya you are closer to 13:1 on compression with pct pistons...depending on the compression calculator im anywhere from 13.2-13.5:1 c/r with my flat face valves and slightly milled head and im running b18c bottom end ported b16 head with pct pistons.

 

is it tuned...?

Run coppers, 7-8 heat range like All Motor stated. and make sure your dizzy timing is synced with your ecu

 

Thanks guys. I switched to coppers and I'm going to bump the octane to 110 from 93 and see if that does anything. I will also probably go back to mobile 1 oil. My main concern was that you guys thought it was getting enough fuel. I know if the octane isn't high enough or if there isn't enough fuel left after combustion the plug can get extremely hot and more or less explode. Thanks for confirming what I was thinking. I feel a little better about it now.

 

What are the AFR's at WOT? What is ignition timing at peak torque? At peak HP?

 

I dont drive the car I usually just fix it. I asked the driver what the air fuel was and he said he was paying attention . He was focused on the oil pressure gauge because the oil temp was pegged at 250. So for all I know it could have been way in the red zone at wot. If you mean where is timing set at, it is just at the factory setting. Not advanced insanely or retarded insanely. What kills me is that the only things that chenged from the last motor to this one are as follows. 1. dropped the compression a little bit. 2. used 93 octane as opposed to 110 octane. 3. used rotella 15w-40 as the break in oil and just put more rotella in after the first oil change. it originally ran mobile one 10w-30 full synthetic.

 

its actually about 11.8:1 currently. It was almost 13.0:1 on the last motor though.

 

Everyone says the compression is thought the roof. People its 11.8:1 at most. the last motor had about 13.0:1 compression. And Thanks for the tip on the v-powers. I never did know what gap to set the plugs at so I always left them alone. Thanks

 

GSR Block / rods / crank
ITR head
3 layer HG and only CTR/PCT pistons and only reving to 8k will give you almost 12.7CR.. if you aren't tuned your running entirely too lean.. for 93.. yes its very capable of running higher CR on pump gas, but realistically you need to be tuned very well do so..
zealautowerks.com , its a CR calulator and it isn't 100% but its pretty close..

 

No ****? Huh? Well about that. Im kind of worried now. I was going by the c-speen racing cr calculator. Its actually revving to about 9500K ocasionally 10000k. And guess what its not tuned. Well theres yer problem. lol. Ok so now the motor has an s100 in its future and rc 310cc injectors.

 

^^^Actually I just checked out the zeal one and I only came up with like 11.4:1. but when I change it as if I were running ls rods 89mm it jumps to 12.7:1. Is that where you are getting that from or am I just a moron? Please enlighten. Im all confused now.

 

If it is a race motor, you need to invest in some tuning. Next would be invest in a system that has onboard datalogging so you can review the engine data after each run.

 

If the head has been resurfaced it wont bump it much....if it has been milled it will bump it a lot.

 

Thank you sir for the clarification. That helps a lot. The head is actually brand new from acura. I probably could have done more with the $1700 that was spent on it with a gsr head but what ever. But thanks again.