First off, I wasnt gonna chime in, but it is obvious what you are doing, and its called CYA, and your hoping some dumb 21 year old sailor will buy your story. If you try to embarrass him enough in public on the web.

Stockerta00 hasnt comitted any crimes. If my engine blew up I would be curious as to how a car should be tuned too. And you are right about the rods because this engine made 492 rwhp(no mufflers) in my car for an entire year. Then, It made 489rwhp through the exhaust about 5 days before it went into stockerta00's car.

Second, you can point fingers all day, but the fringes around the reliefs are due to a semi dull cutter being used. I know, I have been there. And if the valves were actually hitting the pistons there would be shiny marks on the pistons inside of the vlave reliefs. Again i know because those vlave reliefs are considerably greater diameter than the valves themselves. If any of the valves have been hitting the pistons then they would be markedly bent. Valves arent made out of spring steel. If there is any question about ptv clearance blowing up your engine without any aparrent signs, you dont speculate and blame, YOU MEASURE!

Third, a stock gm engine that isnt modded untill after 20-30,000 miles, and spent those first 20-30k in a gmc truck, and that has the oil changed after every race weekend/dyno tune session will have bearings that look nearly new.

Fourth, And as far as taking responsibility for what happened to his engine, Go ahead and post the pictures of the pistons that have the ring lands blown off of them. That will discredit your whole story.

 

I apologize if there was anything i said on the forum to bring an question to your work. I am just freaking out a little about my motor failing. At no point did i wish to imply that I was blaming your shop for what happened. I just wanted some questions answeed and it would appear as if I have done it the incorrect way. Sorry for any problems I may have caused and hopefully this will not disturb relations in the future. Im going to stop posting on this thread now.

 

edited because of double post.

 

Ok, first your telling me that the bearings had 20K on them right? and then your gonna tell me and my partner, that has 25 yrs of machine shop exp, his dad owns one and he worked there all his life, that you fly cut a Hypereutectic piston, that doesnt have enuff material to begin with, with a tool so dull that it left huge burrs on the pistons (aluminum, left burrs on ALL OF THEM), and that then you didnt deburr them? If you want the pics of the broke ones you'll have them in the morning. yeah it broke at the ringland, same place on 2 pistons, right where the intake valve hits them the deepest. Somebodys full o **** here and it aint me. It looks like a motor somebody threw a set of heads on with bigger valve and never checked the valve clearance. Just like he told me. So which is it? Are you telling me this thing is as it was for 1000s of miles for you? Or did he slap a cam and heads on it like he said he did, right here on this forum? Like I said somebodys full o ****.If i thought for a second that it was somethin i did, hed be getting a HUGE discount. And BTW I'll put the crank and a rod and piston in it to measure.

 

Have you actually ever fly cut a piston? I would bet not. I've spent at least a couple years in a machine shop. My partner spent most of his life in a machine shop, literally. you are simply full of ****. dont try to snow somebody. I'm 40 yrs old, and have over 2 decades exp. you dont just use a "semi-dull" cutter to flycut a piston. I could post pictures of the stuff that my partners made that would blow your mind. Hes flycut dozens if not hundreds of pistons. I have seen it done repeatedly. your saying you took this motor out and put it in his car. Hes saying he put a head and cam package on it. Which is it?

 

This is the only post I saw as bashing and truthfully I didn't even notice it on the first read. All I read was the shop freaking out.

Relax,no big deal.The **** wasn't built right and blew up.It happens

 

This is all i have to say.
The bearings do have that many miles on them period! I would hope that an engine can have more than 30k on it before it needs bearings, gm would be out of business. Stock gm bearings are mostly aluminum so they dont show much wear untill theyre ready to sign off.

Yes you can buy fly cutters to do it yourself, you use an old head and the cutter shaft goes in through the valve guide. I have done it on about ten cars, all with no problems. And you measure the clearance and use clay to check, atleast I do. thats why it ran fine for a whole year.

Yes, i put about 6,000 miles on that exact engine, over 45 dyno pulls to 7200 rpm, the valves dont hit. I have seen pistons with big shiny gouges in them and valves bent at 45 deg angles when things go bad and valves hit.

Yeah i would think a ring land would explode there (near the vlave relief) first if it detonated, that makes sense.

Bottom line, it wasnt ptv clearance.


Im not questioning your experience, my experience doesnt matter either. I think you know exactally what you are doing, and you know what happens to pistons and valves when they meet. And you know what happens when an 11.0 :1 engine gets 33 deg total timing, on a lean dyno pull.

There wasnt any reason to come on here and attack him. And it doesnt take a whole book full of cursing to get your point across.
Im not arguing any more.

 

First off I can tell you that it is def not a build problem, I have seen this motor while it was in the vette both at the dyno and at the track, seen it put down bout 500 at the wheels prob bout ten or more times, and saw it take the vette in to the tens plenty of times, its not a build problem. I have seen timmy in person notch pistons, using an old head.

 

First off, it came in making 390. We got it to 412. What do you think i could have done to get another 80 rwhp? It made just over 400 at 13:1 with less than 30 deg. The more timing I put in it he more power it made. I stopped at that point. It never pulled timing. Log continuosly while tuning. The reason it didnt leave any shiny marks on the pistons is it didnt hit them flat. Thats what happens when you try to fit a 2.055 valve in a relief thats cut for a much smaller valve. Its not only not deep enuff its the wrong diameter. I didnt come on here attacking anyone, just telling the other side. I guess it had ARP rod bolts from the factory? Somebody aint telling the truth. He says him and his buddy put it together and you say its been running for a long time in your car. Maybe he didnt get what you're saying he got? The bearings dont look like 20K bearings. They look like 1K bearings. They could be older but not out of a 490 HP with dozens of dyno pulls and 1000s of miles. Something dont add up. 33 deg @ 13:1 aint gonna do this. Not without some indication of ping. He sat there the whole time. Ask him if he heard anything.

 

The interference wasnt bad enuff for it to be catastrophic. didnt think i thru the whole book of curse words out there. Just tryin to get a point across. You think if Ida taken 5 deg outta it it woulda made another 80+ HP? Please....I put timing in in incriments of .5 and 1 deg and it made more power each time. Thats when I knew something wasnt right.

 

Im not complaining about the power it made, my car isnt the same as his. I had better headers, exhaust, electric w/p etc, I dont care about the power it made. It should make 50 hp or so less. If you want to do the right thing, get some clay, stick it on top of a piston, set the head on it, let stocker ta00 roll the engine over a few times with a check spring on the intake and exhaust valves, and then cut the clay with a razor blade and let him see for his self, that is where the truth is held. I have never been able to check ptv clearance from my home pc.