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Interference on a non-interferencemotor?

GP_Kid18

GP_Kid18

New member
Thats what my tuner told me, he said my timing chain had jumped and that my pistons hit my valves, now i am in need of a new motor, a few of my friends think this guy is trying to pull one over on me, so they said i should post up here to see if anyone else has had this problem, or may know something about interference in a non-interference motor.
 


What makes you think you need a new motor? Does it still run? Make any wierd noises? We need more info before we can help you.

A year/model/and any mods you have installed will help as well.
 
FordMan77 said:
What makes you think you need a new motor? Does it still run? Make any wierd noises? We need more info before we can help you.

A year/model/and any mods you have installed will help as well.
Click to expand...


About GP_Kid18
Name - Paul
Location - Palatine,Illinois
Ride - 2004 GP GTP
Engine type and displacement - 3800 series III 3.8
Induction - S/C
Major modifications - SLP Catback and Custom Cold Air Intake,MSD coil packs,TOG Headers, 3.4
Tranny type - Automatic
Tires - Street Radials
Race weight - 4800
Horsepower - 260

Public Profiles sometimes have useful info.... Possibly chipped a piston given that your rocking a 3.4 on the that GenV with only intake and exhaust work.
 


If your pistons hit the valves...then ya youz gonna have issues.

Ummm, as well as the GenV on the 3.4" with just headers...shoulda been running a 3.6" at the smallest.

Probably too much knock bruh.
 
TLSheff said:
About GP_Kid18
Name - Paul
Location - Palatine,Illinois
Ride - 2004 GP GTP
Engine type and displacement - 3800 series III 3.8
Induction - S/C
Major modifications - SLP Catback and Custom Cold Air Intake,MSD coil packs,TOG Headers, 3.4
Tranny type - Automatic
Tires - Street Radials
Race weight - 4800
Horsepower - 260

Public Profiles sometimes have useful info.... Possibly chipped a piston given that your rocking a 3.4 on the that GenV with only intake and exhaust work.
Click to expand...

Duh. Never even thought to look there. Usually can tell from the post. I'll try and remember to check that :D
 
bluegtp91 said:
Ummm, as well as the GenV on the 3.4" with just headers...shoulda been running a 3.6" at the smallest.

Probably too much knock bruh.
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Why should he not be smaller than a 3.6 if he has headers and a GenV? Would this be an acceptable pulley size on a GenIII?
 
SnowFlake said:
Why should he not be smaller than a 3.6 if he has headers and a GenV? Would this be an acceptable pulley size on a GenIII?
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Gen V's are more efficient at moving air so rule of thumb is the pulley size on a gen V should equal about .2 more than a gen 3. I had KR with my 04 when I tried a 3.4 on basically headers and a tune. Mostly went away when I pullied up to a 3.6
 


OH4CompG said:
Gen V's are more efficient at moving air so rule of thumb is the pulley size on a gen V should equal about .2 more than a gen 3. I had KR with my 04 when I tried a 3.4 on basically headers and a tune. Mostly went away when I pullied up to a 3.6
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So help me to understand this... the GenV is more "efficient" (how so?) and this means you NEED to pulley up about .2 VS what you would run on a GenIII?

I'm just trying to figure out why.
 
because of the outlet shape and the more efficient design of the case, the heat created at a certain level of boost is less than that of the gen3.
 


knock = pinging = pre-detonation. do yourself a favor and google it.

our 'KR' is the PCM reacting to pre-detonation. so if you see KR, it's already too late. however, the car is very good at what it does which is why we are able to tune based on KR levels.
 
Have you not seen our factory exhaust systems?

And...

The GenV has better designe rotors/different coating.

The GenV doesn't have the "ramp up" effect that the GenIII does that you can somewhat cure from porting/polishing and filling the dip in the inlet.

Also...to clear this up...I typed this up a long time ago:

oooooooooooooooooooooooohhh...I've typed this a few times...here goes.

The reason people upgrade from the GenIII to the GenV is a couple reasons...one being efficiency...you can get away with smaller pulleys on a GenIII but your yanking more power off of the motor to do so...where as the GenV...you can make the same power with a larger pulley and take less power off the motor to do so. The other reason being the rotors never flake apart from what I've seen...GM skimped on the GenIII's and it shows...the coating on the GenV's rotors are tits. The inlet to the GenV also doesn't "ramp" up like the GenIII's do...so you don't have to worry about the air having to run up to get to the rotors...guess you could call it an obstruction. Typical rule of thumb...I don't really say .2"...because some people will have different results. I will say that most 3.4"/3.25" setup GenIII cars are the same on GenV cars with a 3.6"/3.4" setup. You've just gotta mod more to drop pulleys on the GenV's. Also...according to Eaton...anything lower than a 2.8" on a GenV makes it spin WAY too much...causing a big break in inefficiency...only thing I would do...if you were GenIII and just kept running down in pulley sizes is this...when you get to a 2.55" on a GenIII, go to a 2.8" GenV...and be happy.
Click to expand...
 
Bio248 said:
knock = pinging = pre-detonation. do yourself a favor and google it.

our 'KR' is the PCM reacting to pre-detonation. so if you see KR, it's already too late. however, the car is very good at what it does which is why we are able to tune based on KR levels.
Click to expand...

Okay so what I've gathered is that our cars knock because of the excessive heat generated by our blowers... didn't even have to google that!

So I'm just trying to organize all of the points made here into a coherent overall "big picture"

The GenV is more efficient in such a way that it creates less heat than the GenIII pulley vs pulley. But when switching to the GenV from the GenIII typically you need to go up .2'' in pulley size so you don't knock due to the better efficiency of the GenV blower. So since the OP has a 3.4 pulley with only headers and other small supporting mods you guys think he chipped a piston and shouldn't be running lower than a 3.6 pulley, but on a GenIII which blows air at a hotter temp, a smaller, more heat creating pulley would have been okay... since a lot of people run 3.4s with headers.

Am I on the right track?
 
more boost per pulley goes along with the gen3 vs gen5 debate too. efficiency not only means cooler outlet temps, but more boost.
 
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