MrMeanGreen Posted March 14, 2006 Report Share Posted March 14, 2006 So in tearing everything down, I notice that there's this white spot, almost like a calcium deposit (and about as hard) on the top of my #1 piston. http://www.unleadedanalog.net/pics/piston4.jpg http://www.unleadedanalog.net/pics/piston5.jpg Anyone have any idea what this is? All seriousness would be appreciated. Thanks. EDIT: Added better pictures, so you cynical asses can see in better detail Quote Link to comment Share on other sites More sharing options...
copperhead Posted March 14, 2006 Report Share Posted March 14, 2006 focus next time Quote Link to comment Share on other sites More sharing options...
Browning Posted March 14, 2006 Report Share Posted March 14, 2006 Maybe an early sign of detonation? Too high of temps? Faulty plug? Quote Link to comment Share on other sites More sharing options...
Mensan Posted March 14, 2006 Report Share Posted March 14, 2006 It might be smudge on your piece of shit camera. I have no idea what anything in those pictures is because you apparently suck at taking pictures. Good luck though. Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 14, 2006 Report Share Posted March 14, 2006 Maybe an early sign of detonation? Too high of temps? It's a sign of both... are there specks of aluminium on the plug that came from that hole? Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted March 14, 2006 Report Share Posted March 14, 2006 It looks like you went way lean on your photo taking skills Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 14, 2006 Report Share Posted March 14, 2006 whats the shiny part in the lower right of the cylinder? Pics are to damn fuzzy to tell. Quote Link to comment Share on other sites More sharing options...
Browning Posted March 14, 2006 Report Share Posted March 14, 2006 Would colder plugs or added fuel fix that? Nice sig:) Quote Link to comment Share on other sites More sharing options...
MaTS1200 Posted March 14, 2006 Report Share Posted March 14, 2006 That looks like a hot spot on your piston. I don't see any signs of detonation but I would have that injector flow tested. Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted March 14, 2006 Report Share Posted March 14, 2006 i agree those pistons look prety bad. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted March 15, 2006 Author Report Share Posted March 15, 2006 I was taking pics on 5MP resolution and the wrong focus setting, it was early and I'd been up for 24+ hours at that point. I'll have new ones up tonight. Quote Link to comment Share on other sites More sharing options...
Nate1647545505 Posted March 15, 2006 Report Share Posted March 15, 2006 Kinda looks like Cher's face? Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted March 15, 2006 Report Share Posted March 15, 2006 it looks like there is a lot of carbon stuck on top of the pistons? Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted March 15, 2006 Author Report Share Posted March 15, 2006 it looks like there is a lot of carbon stuck on top of the pistons? Yeah, running 10:1 A/F ratio for a couple of years can do that to them Quote Link to comment Share on other sites More sharing options...
Buckeye1647545503 Posted March 15, 2006 Report Share Posted March 15, 2006 Ant is that one of the cyl that the injectors had a prob? I forget, didn't one come unpluged or crap out when you where at the track once ? Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted March 15, 2006 Report Share Posted March 15, 2006 damn dude how did it ever make any power. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted March 15, 2006 Author Report Share Posted March 15, 2006 Added better pics. Scott, I actually had injector problems with the two, rear cylinders. This is the front on the driver's bank. Matt, I made more torque than power, untypical of a centrifugal setup. Because of the rich condition (maxed MAF), I lost a ton of horsepower but made an additional amount of abnormal torque. I think this year will call for a speed density tune and get rid of the MAF altogether. Quote Link to comment Share on other sites More sharing options...
Mattsv8 Posted March 15, 2006 Report Share Posted March 15, 2006 yea a little carbon is normal but never a layer. on my turbo set up im seriously thinking about the fast xfi unit. but it will be carb at first. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted March 16, 2006 Author Report Share Posted March 16, 2006 Well, a friend came over tonight and introduced me to SeaFoam spray cleaner for carbon deposits: http://www.unleadedanalog.net/pics/piston4.jpg http://www.unleadedanalog.net/pics/cleanpiston1.jpg Seems to work well, it did good on the other driver's pistons too Quote Link to comment Share on other sites More sharing options...
Guest Removed Posted March 16, 2006 Report Share Posted March 16, 2006 yea a little carbon is normal but never a layer. on my turbo set up im seriously thinking about the fast xfi unit. but it will be carb at first. The XFI system is the shit! Quote Link to comment Share on other sites More sharing options...
ORourke Posted March 16, 2006 Report Share Posted March 16, 2006 Fo 'sho, Seafoam is the shit. Good to see the before/after pics, that reinforces my suspicion. If you see it in person it doesn't look like flecks of melted aluminum from detonation, I've seen that before and the plugs will tell you what's happening long before you pull the head. The white stuff wasn't solid/metallic at all, it dissolves into dust when you rub it with a towel. The car was running rich as fuck for a long time, like 8:1 rich, in my totally non-professional opinion it looks like there was so much carbon build up on that piston that the crown of the build up turned white from the heat of combustion. There was a ton... seriously a fucking TON of carbon build up on those pistons. Anyway, the white shit is gone now and once you do the things neccessary to get it tuned to a decent AFR pay attention to your plugs. Silvery specks=bad, black soot=rich. Lean may be mean, but if you've gotta pick one extreme I'll take a really rich AFR every time. Carbon>holes. Quote Link to comment Share on other sites More sharing options...
Lustalbert Posted March 16, 2006 Report Share Posted March 16, 2006 Spotting pistons? They arent getting pregnant are they? Quote Link to comment Share on other sites More sharing options...
Billiumss Posted March 16, 2006 Report Share Posted March 16, 2006 Much better pics, I see you found the flower button on the camera...lol Running a true SD tune on your 98 is going to be a great challenge, to bad you couldn't/won't switch over to a 99+ LS1 wire harness and PCM, then it would be cake to tune it in SD mode. Quote Link to comment Share on other sites More sharing options...
MrMeanGreen Posted March 16, 2006 Author Report Share Posted March 16, 2006 You wanna do the install/swap, Bill, I'll buy the parts Quote Link to comment Share on other sites More sharing options...
Casper Posted March 17, 2006 Report Share Posted March 17, 2006 I read this whole thread, and there wasn't one single jizz comment. God damnit you guys are really starting to piss me off. No boobies, nothing. Fuck you all. Seriously though, wire brush on a drill = pistons looking like brand new. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.