Sharif@Forged

iTrader: (92)

I havent heard that clicking noise you are destribing.

Honestly, the more I hear about this, the more I think you had a defective motor.


Amy: Yes...you can detonate a motor by being too rich...usually in the sub 10:0 range at high RPM, the left-over fuel can spontaneous ignite and super-heat your pistons, and everything in the combustion chamber. Usually, this is a result of a stuck-open injector. Its unlikely, but possible...just another one of my theories.

I am sticking to my defective motor story, especially given the abscence of any audible pinging as Joe clarified above. Joe owns a shop, so he is pretty in tune with his motor, and the sounds it makes.

myz8a4re

iTrader: (2)

the only time i would get a pop between shifts in any of my F/I'd cars was from being too rich. almost like a slight backfire pop. i believe it happens between shifts cause all the fuel is added from reading all the air at the MAF then you let off the throttle but the ECU already read all the air so the extra fuel is just dumped & runs extremely rich everytime you let off the gas after a full boost condition. a bypass valve helped this condition for me better than a blowoff valve wich only vents to the atmosphere as opposed to recirculating the boosted air. regardless either way there is always a rich condition after boosting then letting off the throttle....please, im no specialist here nor do want to insult anyones intelligence by posting things you may already know. only wanted to add that since i have some familiarity with popping...........

-justin

mprowe350

Joe,
Sorry to hear about the motor and good luck resolving it. I didn't hear any popping when I had severe detonation issues. I have a SC w/8lbs boost and previous to retarding timing I had lots of detonation around 6000rpms. I could easily hear what sounded like tin cans banging together with the windows rolled up this past winter. If it had been summer, I would have never heard the detonation and might have had this same thing occur. Keep us posted on what happens.

MIKE

Sharif@Forged

iTrader: (92)

Was the poping noise a Mettalic sound, or like an exhuast boom sound. Describe it for us Joe.

joenismo

It sounded like a very slight backfire pop, definately not a metalic sound. Mostly like what myz8a4re described.

Z1 Performance

iTrader: (564)

sorry for your loss, and hope you can get it going again soon

Sometimes there is no apparant scientific reason for things....they just give up the ghost early. Other times things work when they apparantly should not...skidazzles car, and others is a good example....gobs and gobs of high hp, and a stock bottom end

the stock rods are like nearly every other stock rod....not the worst design (ever see a Subaru rod....yikes!), but could stand improvement if high hp is the end goal.

freezeg35

iTrader: (3)

Has anyone heard of the stillen or vortech superchargers causing engine failure?

Sharif@Forged

iTrader: (92)

joe...what did your wideband read at WOT at about 3000-4000rpm.

joenismo

3000-4000 would have been in the 10's under WOT.

SQUILL

Joenismo when do you think you will have the motor apart?

APS

This will in many cases will cause an engine miss (normally referred to in the tuning industry as a rich miss) I have never seen or experienced engine detonation caused by over rich air/fuel ratios..........to the contrary rich air/fuel ratios helps to cool pistons and combustion chambers.........hope this helps you guys.

Peter

APS

little_rod

Well joe, I will say, I was one of the first hits on this trend Friday night, and have been thinking about it every since. I wanted to see how thoughts on the subject would come to light. I am really sorry to hear about your loss, it is stories like these from guys (like you) who actually know what they are doing that scares the pants off of regular consumers like myself.

This does appear to be more of a timing/plenum issue, but it still scares me when thinking about a TT. I believe we should be worried about timing no matter what boost we are running. phunk, you did say that you can't really point at the plenum, but I am just starting to think that it is hard to point at anything else. It is the main thing causing the front cylinders to run rich and the back ones to run lean, which is something that a wideband can't even help you with. From the evidence that we have seen so far with cylinders #5 & 6, I just don't see another culprit causing these problems other than the plenum.

Sure, the timing will be the main thing, along with your A/F of course, but if you are borderline in one of those things, the stock plenum definitely doesn't appear to help that situation.

Sharif@Forged

iTrader: (92)

My biggest concern would be this poping sounds as soon as he put the clutch in, even when not at higher RPM. Almost like something was loose or damaged already. That's whats so strange about this....not a typical failure.


APS, richer A/F mixtures do cool the combustion chamber, but at a point, usually in the sub 10:1 range, you can still detonate the motor. One person has done this when he was WOT at higher RPM and his injector got stock open. It is very rare, but it is possible.....

myz8a4re

iTrader: (2)

Gq, I have heard of the rich detonation as well with the aftermarket turbo mustangs. The extra fuel ignites way late just about when the piston in that cylinder is returning & puts way too much pressure on everything in that cylinder causing potential problems, almost way passed the misfire issue, more like a stuck open injector as you mentioned. Not as uncommon as some may think especially if the duty on a smaller injector is increased or pushed to max duty cycle...............

Gq, you just change your avitar? I just today noticed that hot sb z. What kit is that? I want to say stillen but it looks different on the sb for some reason. Mine is sb & I'm in the market for a hot kit, just can't make up my mind. Appologies for thread hijacking, my concerns are still with joes ordeal ............

-justin

Sharif@Forged

iTrader: (92)

Thanks Justin. The kit it the ING kit replica made by Initial D. So far, I think three people have them on the boards. There are more pics in the link in my sig....i changed the avatar becuase I got tired of people telling me it doesnt look like me!

joenismo

Well I just finished pulling my motor with the help of 7-eleven, and one of my employees. A couple of points of interest are that my passenger side waste gate was leaking( because of access to tighten the allen head bolts) and the wire loom that runs down by the passenger side piping tubes was getting pretty hot and started to melt the outside. By the way I do like the picture of your car GQ, that was the first thing I noticed about your post. Had to show a pic of my cool looking clutch right.

joenismo

Here is the hole in the block. You can see it is the exact size the half the rod.

joenismo

I am not very excited about the installation of the motor again in a month. Lots of wires, hoses, and bolts.

tig488

iTrader: (18)

DAMN, thats scary looking!

Sharif@Forged

iTrader: (92)

Holy crap Joe! It looks like your engine bay was it with an air to ground missile!

Is that aluminum block repairable? I would think not, given that AL is to hard to weld and work with...but maybe it can be repaired?? Who knows...do you?

Man..that 7Eleven guy is a cool cat....glad he helped you pull out the motor.

And hey, can I borrow your clutch while your car while you complete the engine overhaul? kidding...kidding!