AlexLs1

iTrader: (1)

I'll be sure to keep you guys posted. Thank you all for your input.

The car has had spray on it since February. Car has roughly seen about 4-5 bottles. My kit; it's a Nitro Dave's plate Kit (78mm)/wet, 150 pill. I have 42lb injectors and a Walboro 255 lph.

I was thinking someone else could benefit from this as well like you mentioned.

Thanks for the kind words.

AlexLs1

iTrader: (1)

Damage Report: The # 4 piston has a whole in it.

So I need to replace that one bad piston, a new set of rings and I'am going to change my head gaskets since there already off.

I'am thinking the cause of this might be a bad injector just thinking about it off the top of my head.

What are you guys's thoughts to this happening?

s/c'd cav

iTrader: (10)

was the hole a melted hole or like some broke ? and was there any pitting to that piston ?

what do the rest of the pistons look like ?

eallanboggs

iTrader: (1)

A hole in a piston sounds like the wrong heat range spark plug(plug too hot) or you ran very lean. Need to go down one or two ranges toward the cold side or find the source of the fuel starvation problem. Are you running wet or dry? Blowby is pressure past the rings toward the crankcase(bottom end). What some people have described here sounds like reverse blowby(if there is such a thing) since his problem is the valve cover gasket("O" ring in a machined groove) being blown out(top end). The pressure to push that "O" ring out of that groove has to be considerable. Once you have a hole in a piston all bets are off.

AlexLs1

iTrader: (1)

The whole in the piston looks more like a burn whole. The rest of the pistons are fine.


Leaning towards a lean issue/related.

Jon@Texas-Speed

iTrader: (18)

Yeah sounds like you melted the piston. Unfortuneately, nitrous is not very forgiving with an improper tune-up in the car. Believe me, I know! Best bet would be to get the car on the dyno and check the fuel as well as the timing. A TR-6 plug should suffice for a 150 hit, no problem. Be sure to look over the rod and cylinder head prior to reassembling the engine.

You should have the new pistons and misc. parts tomorrow. Let me know if you have any other questions and concerns and we'll get you fixed up!

AlexLs1

iTrader: (1)

Thank you very much John.

Yes, I just got back High Output Engineering; the shop doing the work and we talked about all these things.

I know as far as timing I have 21-22 degrees. My Air to Fuel ratios are: NA 12.5 and on N20 its 11.5-11.7.

Thank you for all your input and Texas Speed. These guys never let me down not to mention the great prices they have along with great service.



Thank You John and everyone else at Texas Speed, John thanks for the fast parts and great service. You were a huge help to say the least.

TLewis4095

iTrader: (10)

Burned electrodes on the plugs is a sure sign of detonation usually caused by a lean condition...the hole burn't in the piston is the result. Usually #'s 7 & to a lessor extent #5 will be the first to incure damage in the LS based engines, so you could have an injector issue where your overall A/F ratio looked safe but one or two pistons were still lean. Where did you place the wideband O2 for the tune reading? While it is apart, I suggest getting the injectors flow-tested & matched. There are a few shops not far from you that can do it reasonable.

As TSP has stated, the TR6 plugs should be cool enough for the spray so you need to find what caused the lean-out (keep an eye on fuel pressure at the high RPM range as well) or you will repeat it.

Good Luck!

Tracy

AlexLs1

iTrader: (1)

Thank you Tracy.

I appreciate your input.

I met you yesterday at your dyno day. I was with Adam, pewter bolt on SS with black wheels, his friend.

A pleasure to meet you and thank you for the shop tour. Very impressive.

Thanks again for the advice.

All is being addressed.

TLewis4095

iTrader: (10)

Ahhhhhh, now I regonize the signature! Bob from Precision had the street tune perfect as evidenced by the dyno.

AlexLs1

iTrader: (1)

Yeah yeah, for Adam's car; had the street tune by Bob, the Pewter Bolt on M6 SS.

I have a full motor and nitrous dyno, street and track tune from Bob.

regency

iTrader: (15)

i would have that head checked out!!! Thats alot of heat on them valves when burning pistons

AlexLs1

iTrader: (1)

What it looks like some uncontrolable crank case ventilation, when I take the precautions to prevent such a thing, as well as a lean condition with that one bad injector (replacing 2 of them just to be safe); resulting in burning cigar size hole in 1 piston......caused this nightmare and extensive money dissappearence.

Despite if there's more to it or not, I have to look on the brightside in a situation like this. Who I orginally wanted to build my motor is now doing it (see sig). At the time Dave Graves, owner of High Output Engineering, was unoperational. Nothing against Texas-Speed, I'd recommend them for anything LSx related. Great guys, just preference. Texas-Speed did build me a great motor, it shouldn't of lasted as long as it did, despite my tune.