Piston #7 died check out these pix!
12-08-2005, 05:25 PM
#21
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Hmmm looks kinda like the piston that I just took out of my engine. I too recently destroyed #7. It sits at my desk at work to remind me that boost and cold air are not a good combination. I am in the process of picking replacement parts.
Right now I am looking at Wiseco turbo pistons and some Arrow Precision rods. I am getting great deal on the rods that is why I am going with them. The company makes rods for World Rally cars, Le Mans series, F3, Touring Cars, F3000. They are getting out of making steel forged machined rods and moving to all titanium so they unloaded their inventory for cheap. My builder got them for 800 CDN, they are regularly 1500US for a set so I could not pass up the opportunity. Now I have to decide how far to upgrade the valvetrain.
I had plans to get a moser 12 bolt this winter but the engine hickup kinda put that on hold for a while. Maybe next year I will get a 12 bolt and get some slicks to actually get the power to the ground.
Right now I am looking at Wiseco turbo pistons and some Arrow Precision rods. I am getting great deal on the rods that is why I am going with them. The company makes rods for World Rally cars, Le Mans series, F3, Touring Cars, F3000. They are getting out of making steel forged machined rods and moving to all titanium so they unloaded their inventory for cheap. My builder got them for 800 CDN, they are regularly 1500US for a set so I could not pass up the opportunity. Now I have to decide how far to upgrade the valvetrain.
I had plans to get a moser 12 bolt this winter but the engine hickup kinda put that on hold for a while. Maybe next year I will get a 12 bolt and get some slicks to actually get the power to the ground.
12-08-2005, 07:03 PM
#22
If you were pulling oil into the TB from the PCV system, that will kill the octane count of the fuel being burned causing detonation. It may not have been visible during the tuning process, but after some hard runs it may have started making it into the intake.
That's just my theory and a very likely one at that. Did you have a catch can on the car? Any signs of oil behind the TB?
Time for a stroker
Good luck to you man!
James
That's just my theory and a very likely one at that. Did you have a catch can on the car? Any signs of oil behind the TB?
Time for a stroker
Good luck to you man!
James
12-08-2005, 07:10 PM
#23
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Originally Posted by LIL SS
Dynojet.. Not sure on the exact model.
Ryan's car has dual electric cut outs just after the header collectors and in front of the cats. The wideband was put in the cut outs so basically in the header collector.
I see nothing wrong with the 28* timing. I've seen several different tuners run from 27-29* and they aren't back yard guys either. What do you typically run for timing Rick?
BTW, here is his dyno post.. https://ls1tech.com/forums/dynamometer-results-comparisons/368371-finally-got-my-setup-tuned-dyno-d.html
Ryan's car has dual electric cut outs just after the header collectors and in front of the cats. The wideband was put in the cut outs so basically in the header collector.
I see nothing wrong with the 28* timing. I've seen several different tuners run from 27-29* and they aren't back yard guys either. What do you typically run for timing Rick?
BTW, here is his dyno post.. https://ls1tech.com/forums/dynamometer-results-comparisons/368371-finally-got-my-setup-tuned-dyno-d.html
Rick
12-08-2005, 10:12 PM
#25
Rick,
Please correct me if I am wrong but aren't most the off the shelf cams from the vendors over ------> ground with advance in them? I can only think of a few that are ground straight up. And this includes the ones on a 112lsa.
Again, I have seen cars stop making power at 26* timing and others like 30*.. Ryan's didn't make any more power from 28*-30* so I brought it back down to 28*..
Please correct me if I am wrong but aren't most the off the shelf cams from the vendors over ------> ground with advance in them? I can only think of a few that are ground straight up. And this includes the ones on a 112lsa.
Again, I have seen cars stop making power at 26* timing and others like 30*.. Ryan's didn't make any more power from 28*-30* so I brought it back down to 28*..
12-09-2005, 12:52 AM
#26
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Originally Posted by LIL SS
Rick,
Please correct me if I am wrong but aren't most the off the shelf cams from the vendors over ------> ground with advance in them? I can only think of a few that are ground straight up. And this includes the ones on a 112lsa.
Again, I have seen cars stop making power at 26* timing and others like 30*.. Ryan's didn't make any more power from 28*-30* so I brought it back down to 28*..
Please correct me if I am wrong but aren't most the off the shelf cams from the vendors over ------> ground with advance in them? I can only think of a few that are ground straight up. And this includes the ones on a 112lsa.
Again, I have seen cars stop making power at 26* timing and others like 30*.. Ryan's didn't make any more power from 28*-30* so I brought it back down to 28*..
rick
12-09-2005, 01:06 AM
#27
I'm not saying all cams have advance ground in them. I am saying most the off the shelf cams from the main vendors ----> use some sort of advance in their cam. Whether it is a 110icl with a 112lsa, 0r a 112icl / 114lsa.
I agree you don't need advance ground in a cam but that's not what I'm trying to point out.
The other thing I am trying to point out is there are a lot of people running 28-30* on these cams that have advance ground in them.
I agree you don't need advance ground in a cam but that's not what I'm trying to point out.
The other thing I am trying to point out is there are a lot of people running 28-30* on these cams that have advance ground in them.
12-09-2005, 10:37 AM
#28
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Originally Posted by LIL SS
I'm not saying all cams have advance ground in them. I am saying most the off the shelf cams from the main vendors ----> use some sort of advance in their cam. Whether it is a 110icl with a 112lsa, 0r a 112icl / 114lsa.
I agree you don't need advance ground in a cam but that's not what I'm trying to point out.
The other thing I am trying to point out is there are a lot of people running 28-30* on these cams that have advance ground in them.
I agree you don't need advance ground in a cam but that's not what I'm trying to point out.
The other thing I am trying to point out is there are a lot of people running 28-30* on these cams that have advance ground in them.
Do you even know what his plugs look like? The plugs will also gives us all some light as to what might have happened. Also, what did the compression test show when you guys put the combo together. This is also a good tool to help people figure out how much timing to run and not to run.
Again, where did you take the AFR reading from? If its at the header, 12.2 might have been alittle rich causing the car to knock. And yes, these cars will knock, not audible, but PCM related. That will cause it to keep going lean. Seen it many times.
Rick
12-09-2005, 01:32 PM
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Originally Posted by TXCAMSS
Well Johnny it looks like we have a winner in the most abused #7 piston contest.
OMG! What happened?
OMG! What happened?
12-09-2005, 01:42 PM
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Originally Posted by wait4me
That is the coolest piston death i have seen.. Reminds me of those old drawing kits you could buy,
Came with the gears and you could draw patterns and stuff..
Came with the gears and you could draw patterns and stuff..
ohh man, what was the name of that thing!
yeah, you could imagine the confusion on my face when i saw that piston sitting there. I was expecting to see an empty jug.
"ok, i have piston to valve contact. why did the motor sieze?"
I touched the piston and it almost fell into the oil pan.
I took the con-rod out and had a friend tack weld it together (from 3 pieces)
BOSS APPROVED!
12-10-2005, 02:29 PM
#37
i work in a chevy dealer ship as a tech and we see lots of problems with miss fires on #7 caused by dirty injectors.. the fuel rail gets dirt in it and for some reason piles up in the back next to the #7 injector. this happens on all genIII motors from in all vehicles. just wanted to add my .02$
12-10-2005, 09:40 PM
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Originally Posted by camarokid94
i work in a chevy dealer ship as a tech and we see lots of problems with miss fires on #7 caused by dirty injectors.. the fuel rail gets dirt in it and for some reason piles up in the back next to the #7 injector. this happens on all genIII motors from in all vehicles.