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Burnt piston in engine

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Old 02-05-2006, 04:12 PM   #1
Jglisson
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Default Burnt piston in engine

Well...

Some of you do not know...but I blew my engine in my 99 GT about a month ago. I just now tore down my factory engine. Piston #7 has a nice chunk missing out of it. About half the cylinders were full of coolant when I pulled the heads. I still haven't determined what caused the piston to burn. The burn is underneath the intake valve which is strange as well. I wasn't spraying at the time the engine popped and what few times I have sprayed I was only running a 100shot with 93 octane.

Any ideas?

I will be getting rid of some good parts soon...If you name it, I have probably got it.

Good PI heads, sensors, etc.
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Old 02-05-2006, 05:29 PM   #2
Dave2000GT
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Default RE: Burnt piston in engine

"I gotta be honest... these 2V 4.6 motors are weak as hell..." - Dave2000GT
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Old 02-05-2006, 05:44 PM   #3
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Default RE: Burnt piston in engine

^^ lol i remember that, hope u got your flame suit on.

anyyway, what were you doing when it blew?
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Old 02-05-2006, 05:48 PM   #4
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Default RE: Burnt piston in engine


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^^ lol i remember that, hope u got your flame suit on.

anyyway, what were you doing when it blew?
Not only that but I've surrounded myself with fire retardant just check out the things people say about 4.6L thread... I think I might get booed off the forum..
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Old 02-05-2006, 11:09 PM   #5
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Default RE: Burnt piston in engine

haha i remember that since it was in my post.. still lookin at new cars.. but damn it seems like everytime i look through the forums i end up readin about someone blowin there sohc 4.6
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Old 02-06-2006, 12:12 AM   #6
Jglisson
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Default RE: Burnt piston in engine

I wasn't spraying...but I was laying into the throttle.. There is no doubt about that.

Funny thing though...all the police cars hold up quite well with the SOHC 4.6
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Old 02-06-2006, 12:18 AM   #7
romans marine
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Default RE: Burnt piston in engine

well the 4.6 is weak as hell when your pushing 5K RPM and don't have any oil in it.......DOH!!!!! (I won't be doing that again)
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Old 02-06-2006, 01:09 AM   #8
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Default RE: Burnt piston in engine

100 shot dry is pushing it, mine started to pop (detonate) at 75 shot dry, so i have a 50 shot right now untill my fuel rair adapter comes in.
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Old 02-06-2006, 01:19 AM   #9
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Default RE: Burnt piston in engine

how many times have you sprayed befor? and were you tuned? becuase the 4.6 should have lasted a long time if it was tuned good. the 4.6s are strong motors as long as they are tuned right.
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Old 02-06-2006, 01:22 AM   #10
gt96stang
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Default RE: Burnt piston in engine

People that are always saying that the 4.6 is weak is because their tune sucked. It's always in the tune.
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Old 02-06-2006, 01:25 AM   #11
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Default RE: Burnt piston in engine

^^ ya code sprayed for a long time at 125 and he was fine then he did a 150 and that was it.
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Old 02-06-2006, 02:50 AM   #12
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Default RE: Burnt piston in engine

tony bolton here in knoxville is runnin a 150 shot without problems... and thats dry.... his car runs a 7.4 best 1/8 mile..... mild mods too.... nothin to serious done to the car.
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Old 02-06-2006, 02:54 AM   #13
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Default RE: Burnt piston in engine

It's all in the tune, the 4.6 is a strong block if tuned properly.
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Old 02-06-2006, 02:54 AM   #14
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Default RE: Burnt piston in engine


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ORIGINAL: 03sonicgt

It's all in the tune, the 4.6 is a strong block if tuned properly.

yea, the 4.6 is not a weak motor.... ive been runnin 440rwhp for 2 months without problems.. and i get on it alteast once a week and wind them out.
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HP stage 2 twin turbo kit
forged shortblock from MMR
VT stage 3 blower cams
stage 3 ported heads w/ oversized valves
built TKO500
P-51
+ alot more

693rwhp 608 toque w/ a slipping clutch and 18psi. on pump gas
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Old 02-06-2006, 02:56 AM   #15
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Default RE: Burnt piston in engine

Hey racer, are you planning on a forged bottom end soon? Just kind of curious.
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Old 02-06-2006, 03:02 AM   #16
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Default RE: Burnt piston in engine


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ORIGINAL: 03sonicgt

Hey racer, are you planning on a forged bottom end soon? Just kind of curious.

yea, once i have money im going a complete forged bottom end, stage 2 blower cams, stage 2 port and polish, upping the boost, and throwing a shot of nitrous on there. i hope to break 650rwhp with all that. thats of course going with a new tranny and stuff too.
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2002 GT ragtop 5-spd

HP stage 2 twin turbo kit
forged shortblock from MMR
VT stage 3 blower cams
stage 3 ported heads w/ oversized valves
built TKO500
P-51
+ alot more

693rwhp 608 toque w/ a slipping clutch and 18psi. on pump gas
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Old 02-06-2006, 03:03 AM   #17
03sonicgt
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Default RE: Burnt piston in engine

I'm jealous!!!!!!!!!!!!!!!!!!!!!! Where you get all that change??
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Old 02-06-2006, 03:07 AM   #18
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Default RE: Burnt piston in engine

Quote:
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I'm jealous!!!!!!!!!!!!!!!!!!!!!! Where you get all that change??

im not sure yet.... hahahha. im still figuring this one out....

right now i dont really have any bills and im making over 700 a month (still in school) and i only owe 1k left on the blower right now.... so after that im saving up for axles and a eaton posi i think.. then going with some shocks/struts... and then brakes... after that i will get tranny and such.... probably after a year or so i will have enough cash for everything... motor will cost me around 3-4k im assuming.
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2002 GT ragtop 5-spd

HP stage 2 twin turbo kit
forged shortblock from MMR
VT stage 3 blower cams
stage 3 ported heads w/ oversized valves
built TKO500
P-51
+ alot more

693rwhp 608 toque w/ a slipping clutch and 18psi. on pump gas
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Old 02-06-2006, 03:09 AM   #19
03sonicgt
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Default RE: Burnt piston in engine

Wait a second, you owe a grand on the blower??? Did you finance it?? Please tell me you did because I could be able to get one then!!!
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Old 02-06-2006, 03:12 AM   #20
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Default RE: Burnt piston in engine


Quote:
ORIGINAL: 03sonicgt

Wait a second, you owe a grand on the blower??? Did you finance it?? Please tell me you did because I could be able to get one then!!!

i financed it with my dad pretty much. ive been giving him about 500-600 a month on the blower. although i got a steal on it and it only cost me 2800 for the blower and accessories.
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2002 GT ragtop 5-spd

HP stage 2 twin turbo kit
forged shortblock from MMR
VT stage 3 blower cams
stage 3 ported heads w/ oversized valves
built TKO500
P-51
+ alot more

693rwhp 608 toque w/ a slipping clutch and 18psi. on pump gas
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Old 02-06-2006, 03:12 AM
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