OMG My Engine is Toast

[john_V63400]

Hard to believe you kept running it at boost w/o a MAF... The MAF just doesn't mess with the tranny settings, it also affects fueling, ESPECIALLY under boost. A 1-bar MAP sensor is NOT letting the PCM know what is going on in the engine, therefore your fueling will not be right, no matter how well you think it is tuned.

Fuelling was fine, i made many..many passes on the dyno to get is good as it gets with out no MAF. It sucks, i was just about to throw in the MAF.
My engine gave and shut off(blew) durring a 2-3 shift at a resoonable 5900 RPMs. I dynoed 352 lb. of torque. I didnt realize I hadnt increased my available torque via Hptuners to my 2-3 shift. Then I made some adjustments, here and there, from some tuning guides I had aquired. My car was running strong, fast, and very strong. i was very..very impressed with the tuning I had done.
Well i took it for another quick full throttle run on the home stretch road to my house, it never made it to 3rd gear, it broke right while it was shifting. I have reason to believe....i simply was putting too much power for it. And maybe my mechanic overlooked something. But he assured me he tightend the cam gear bolt correctly, maybe my timing chain skipped enough to offset timing so bad it collapsed the valves st8 into the pistons and torque the cam gear out of place. any other suggestions

[Superdave]

This would be the 2nd boosted '660 now with a sheared cam pin..

In for carnage pics!

[Z3R0]

Wow....I thaught it was my time timing chain, well I kinda was right.

Cam gear pin was completely shreded, So how does a Cam gear completely move while driving full throttle??? Anyone!

Valves left valve imprint marks on all pistons, and 1 valve completely went threw one piston, and it is still stuck in the piston. WTF...
Yeah those were Arias Forged performance Pistons...950 a set.

Cylinder Walls are completely scored, well boys after a Dyno tune, and acurately tuning the RSM set up with a steady 13 psi of boost. Though some may imply other wise. My engine (excluding the MAF=trans problem) was properly tuned and all acomidating performance parts were in place to produce an awsome engine. unless someone can suggest improper instalation..I dont think these 3400 engines are capable of producing a reliable 350 Hp on a daily driven car.

GUYS!!! I found the problem

[1988GTU]

Sucks...







In before the lock!

[kflo 93 gt]

No easing up from this angle, I've blown up enough engines and taken enough advice to know when someone has dropped the ball. And now he wants to act like it's the engine's fault.

No.

[SappySE107]

bad luck? No luck about it.

[blackbombshell95]

I'm not surprised, not one damn bit. You've constantly disregarded the advice of many brilliant minds here, it's only reasonable that you should pay for said sins.


You seem a lot better off in a Mustang or Peon anyways, tool.

Ease up man.

He's had some bad luck, ok a lot.
Good luck with your new neon.

[kflo 93 gt]

I'm not surprised, not one damn bit. You've constantly disregarded the advice of many brilliant minds here, it's only reasonable that you should pay for said sins.


You seem a lot better off in a Mustang or Peon anyways, tool.

[geoffinbc]

You cannot tune with a 1 bar and no maf...so you are entirely at fault, regardless of what you try to tell us.

Completely agree. Plus if the timing chain isn't broke and the bottom end is still holding the pistons on then the cam only stopped because of a gear or bearing failure. My guess is you did not torque the bolt right since the oil system on the 3X00 motors is very reliable. Unless of course there was no oil in it or you forgot something on the build and had no pressure.

[geldartb]

Brad with the grand am when the MAF is unhooked the pcm defaults the tranny to the max pressure.

found that out when i was doing a ve tune. taking it out of park feels like your neutral dropping it and it slams into every gear.


you can send the supercharger this way if your all done with it.

[SappySE107]

You cannot tune with a 1 bar and no maf...so you are entirely at fault, regardless of what you try to tell us.

[34blazer]

sorry to hear. is the cam gear index pin a weakpoint? is there anything that can be done to make a hardend one?

[bszopi]

Hard to believe you kept running it at boost w/o a MAF... The MAF just doesn't mess with the tranny settings, it also affects fueling, ESPECIALLY under boost. A 1-bar MAP sensor is NOT letting the PCM know what is going on in the engine, therefore your fueling will not be right, no matter how well you think it is tuned.

[El_Diablo]

carnage pix are always welcome...

more than a few guys are getting more power without such issues, sometimes things just break.... not like you can control fracture points and fatigue limits of every part, even stock, things can give way on any engine at any time

[ForcedFirebird]

350hp without some upgrades can expect failure. Hard to believe a valve went through a forged piston, got pics?