Hi all

So I just finished my h22 build and got engine in the car.
I noticed a funny thing, when we checked p2v. Took out the spark plugs and they were bend ok didnt think more about it.

Now im standing here looking at my car and want to fire her up with running in oil.
I gapped the spark plugs and installed em. Cranked the engine for 2 secs and took em out again to inspect. Yes they were bend again..

Had CP do some custom 12.5:1 cr pistons for me btw. And plugs are ngk iridium.

Question is. What can I do about this?

Hope for some replys, not sure what to do here

/Rasmus

 

Also would it be ok to shim it up 1mm each plug with a washer?

 

what is the exact part number of the sparkplugs you are using?

 

Not sure, but its the same plugs I've used with cp's 11.5:1 pistons and with no problems. Guess the dome is kinda big :-)

 

Gap has nothing to do. With it need the part numbers so we can see. If the plug reach is too long

 

I will check tomorrow when i get to the car, and let you know.

Would there be any problem in making 4 washers to raise the plugs 1mm?

 

You just need the correct plugs

 

yes, there would be a big problem with doing that.

we need to know what the exact spark plug is that you're currently using that are getting bent. let us know, and we'll go from there. just remove a plug and look at it, the part number is printed right on the sparkplug

yes.

 

Yep will let you know when I can

 

This is the part number for the plugs Ngk Iridium zfr6fix-11

 

yup, those are the longer tip plugs. get a set of bkr6eix. they're identical except a shorter tip that wont protrude as far. if the pistons still hit those, then you're out of plug options and will need to get a thicker headgasket to raise the head

 

Awesome! Will get apair of those asap then :-)
they dont hit by much, do you know what the lenght difference is?

 

IIRC, its not much... maybe 2mm. Should probably take care of your problem.

 

Thanks, yea 2mm will do the trick :-)

 

I have both sitting in front of me right now. the bkr is exactly 2mm shorter than the zfr

 

donno if anyone else noted.

hes using 12.5cr pistons.
don't you need 7 heat rating spark plugs with that compression?

6 heat rating is for gsr motor
ITR uses 7 heat rating plugs already

 

Uhm good question! I think you're right about it needing heatrange 7?

 

Im using 7 rated on 11.5 in my motor

 

good point guys, I'm surprised I actually didn't catch that.
yes, you want 7's with that compression for sure. bkr7eix if you want iridiums, or bkr7e/bkr7e-11 if you want copper tips

 

If im going with the bkr7eix what gap should i run?
Thanks for all your help btw!

 

hmm, I'd say around 0.030" if your ignition system is healthy, closer to 0.024 if it's not.

 

It is very healthy i believe, new ngk cables farly new rotor + stuff inside. Will gap to 0.03" thanks alot. Got an dyno appointment later today.

 

Ended up going 0.027" +-0.0002 lets see how that goes tonight :-)

 

sounds good to me

 

Every thing went well on dyno, except a dead wideband. But car made 271hp/266nm