Braineack

iTrader: (62)

Examining my head I noticed my #3 looks a little chewed up. I'm assuming this is the result of detonation? Thoughts?

Ben

iTrader: (33)

Holy hell Scott. I'm starting to wonder if you have some sort of fetish involving continually having to rebuild your car.

Braineack

iTrader: (62)

I take that as a yes? The rest look perfectly fine.

patsmx5

iTrader: (16)

Yeap, detonation city. Get out a strong magnifying glass and take a look at that area and others. Looks like little specs of aluminum in the carbon built up on the exhaust valves. Maybe you guys will start tuning a bit richer in boost like you should.

patsmx5

iTrader: (16)

Also get a file and some sand paper and smooth those edges out. Though unlikely, they could be the source of the problem.

wayne_curr

iTrader: (8)

You were one step away from:



Been there done that...was n/a when that happened.

mazda/nissan

iTrader: (2)

this forum would have a lot less interesting pictures if it weren't for Braineack and his misadventures

Ben

iTrader: (33)

That would be my guess. Any little flakes of metal on the spark plug's electrode?

Braineack

iTrader: (62)

nope, everything else looks fine, i just went back over it. Oh wellz.

rogezeus2003

Yes detonation, it looks like my friends 350Z head, just much better, check your oil pan for fragments of metal as well as make sure u clean ur oil pump, change oil.

Braineack

iTrader: (62)

you obviously don't know how I roll.

I'm beginning to wonder if it wasn't some FOD from a part of this screw:




or when my HG blew on #3 soon after I had put this head on last year. I was forced to drive 25 miles with the coolant temps constantly spiking above 220 and coolant leaking into #3...

It's odd it's only in #3, no other cylinders show any damage, you can see similar pitting in #4 in that photo above, but I'm pretty sure that was from the screw dancing around. The injector I put on #3 and #4 flow more fuel than #1 and #2 as well. Good thing I'm doing a coolant reroute, I'll just richen my tune slightly and stay conservative with my timing.

hustler

iTrader: (6)

god damn I feel bad for you. I also feel great about my decision to pull 2* out of my spark table last night.

DragonsMaw

iTrader: (3)

You made the spark table of doom less doomy? Did something happen? I mean besides this thread.

Braineack

iTrader: (62)

You honestly think I'll do anything besides take a 1 degree out and add a few points of fuel after it's back on????

If the block fails I have another and two spare heads...

hustler

iTrader: (6)

Nah, nothing happened...just thinking about conservatism and "what if." Yeah, I'm now running 25-28* fom 4k-7k at 14psi, lol. I was tuned at MBT, I followed everyone's advice and backed off 2* especially considering I have new ignition in the car.

Brain, what's wrong with fattening up and pulling 1*? Its the labor I sympathize over. I haven't' touched the mechanical bits of my car with a wrench since the install.

Braineack

iTrader: (62)

Nothing wrong. I'm just saying, I had the head off for unrelated issues and noticed it. I'm going to smooth it down a little and slap it back on and forget all about it.

magnamx-5

iTrader: (7)

I blame ur FMIC dude if you had a good WI setup ur **** would still be running right still bad luck indeed. Seems like the more we push em the more stuff we find in em to fix.

Braineack

iTrader: (62)

My FMIC is huge and I've never logged over 110*F.

240_to_miata

iTrader: (2)

^^^ holy crap. and i was gunna use your maps as a solid base map for my turbo install next week


I have now taken 1 degree of timing out from the whole map, maybe ill even do 2!!

akaryrye

iTrader: (5)

Not a good idea unless you have lower compression pistons, and im not sure if hustler had headwork done either, but that would make a difference also.