BAD DAY! - PE TT, blew the engine at 5.7 psi

Reply Subscribe

Thread Tools

Search this Thread

Sep 23, 2004 | 09:58 AM

#61

G3po

Registered User

iTrader: (8)

Joined: Jun 2003

Posts: 1,635

Likes: 0

From: Nor Cal.

root cause

Quote:

Originally posted by shivak
Whatever happened to the thread where we compiled information on all the blown FI motors? I guess there isn't as much interest in compiling this sort of data considering:
So many people are getting their motors built anyway.

It's pretty clear that the factory con rods are weak under boost.

The 2005 Anniversary / Track Z is most likely going to come with stronger con rods.

getting to a root cause of many of the bent/broken rod scenarios is pretty important even for those re-building with forged internals. If (pure conjecture) at this point there is a pre-ignition issue , forged rods can also be readily bent or broken. The only real solution to pre-ignition (if it is discovered) is elimination of the the root cause.

Sep 23, 2004 | 10:14 AM

#62

etx

Registered User

Joined: Jul 2003

Posts: 949

Likes: 0

From: Detroit, The Motor City

Quote:

Originally posted by phunk
ravaz: those EGTs you are posting are insanely low... that couldnt possibly be taken from the manifold? is that in the downpipe?

EGTs that low (in the manifold) would be sign of a LOT of ignition timing (advance) combined with a LOT of fuel (rich as hell) and probably some high octane fuel as well??

I was about to say the same thing. Those EGT's are strange. You must have your thermocouple in the downpipe. My Z runs at about 700*-750*C in 6th on the freeway, under boost it stays at about 700*C due to the fuel enrichment.

My eclipse runs at 1600*F @ 25 psi on a biiiig turbo. 1600*F is about 870*C!

Sep 23, 2004 | 10:38 AM

#63

ihatethatbobbarker

Registered User

Joined: Jan 2003

Posts: 4,453

Likes: 0

From: Riverside, California

this makes me sad for you gurgen. hope it works out better in the future.

Sep 23, 2004 | 10:48 AM

#64

GurgenPB

Thread Starter

UltimateSleeper

iTrader: (2)

Joined: Aug 2003

Posts: 1,211

Likes: 1

From: Los Angeles, CA

yeah ... thanks

Sep 23, 2004 | 11:05 AM

#65

G3po

Registered User

iTrader: (8)

Joined: Jun 2003

Posts: 1,635

Likes: 0

From: Nor Cal.

TSB

Quote:

Originally posted by gurgenpb01
yeah ... thanks

FYI, check to see if your VIN falls under the Infiniti Crank sensor TSB. It oculd cause intermittent operation and maybe even pre-ignition.

Sep 23, 2004 | 03:34 PM

#66

Sharif@Forged

Sponsor
Forged Performance

iTrader: (92)

Joined: Dec 2003

Posts: 13,733

Likes: 1

From: Marietta, GA

Pre-ignition would almost instantly destory a motor even without F/I. I guess that is where I am confused. I don't see N/A motors blowing up. Maybe the high cylinder pressure has something to do with confusing this sensor???

Sep 23, 2004 | 03:34 PM

#67

IceY2K1Max

Registered User

iTrader: (1)

Joined: Oct 2003

Posts: 427

Likes: 0

From: Tucson, AZ

Gurgen,

Do you fall under this recall and if so, have you had it performed yet?
http://www.infiniti.com/form/0,,acti...,00.html#32902

Quote:

2003 G35 Sedan Engine Sensors
Applies to 2003 G35 Sedan with the following Vehicle Identification Number range:
JNKCV****3M 000030 – 021207

The number of G35 vehicles potentially affected is approximately 19,102.

Sep 23, 2004 | 04:17 PM

#68

GurgenPB

Thread Starter

UltimateSleeper

iTrader: (2)

Joined: Aug 2003

Posts: 1,211

Likes: 1

From: Los Angeles, CA

yeah... I did

And I took care of the TSB (crank and cam position sensors) almost as soon as it came out

Sep 23, 2004 | 04:24 PM

#69

KyleB

Registered User

Joined: Feb 2004

Posts: 95

Likes: 0

From: Indianapolis

Quote:

Originally posted by gq_626
Pre-ignition would almost instantly destory a motor even without F/I. I guess that is where I am confused. I don't see N/A motors blowing up. Maybe the high cylinder pressure has something to do with confusing this sensor???

More pressure = more heat
more heat = more likely to pre-ignite

If the engine was run at it's highest output for a few seconds too long with extremely high pressure, it could've heated the spark plug to glow plug status and pre-ignited.

Will have pics of the damage soon (spark plugs, pistons, etc)?

Sep 23, 2004 | 08:01 PM

#70

GurgenPB

Thread Starter

UltimateSleeper

iTrader: (2)

Joined: Aug 2003

Posts: 1,211

Likes: 1

From: Los Angeles, CA

Quote:

Will have pics of the damage soon (spark plugs, pistons, etc)?

Let's hope....

Sep 24, 2004 | 08:19 AM

#71

Sharif@Forged

Sponsor
Forged Performance

iTrader: (92)

Joined: Dec 2003

Posts: 13,733

Likes: 1

From: Marietta, GA

Quote:

Originally posted by KyleB
More pressure = more heat
more heat = more likely to pre-ignite

If the engine was run at it's highest output for a few seconds too long with extremely high pressure, it could've heated the spark plug to glow plug status and pre-ignited.

Will have pics of the damage soon (spark plugs, pistons, etc)?

I understand that. But what we're talking about is the potential for a faulty or defective sensor....not the normal progression of pre-ignition.

Sep 24, 2004 | 10:38 AM

#72

KyleB

Registered User

Joined: Feb 2004

Posts: 95

Likes: 0

From: Indianapolis

Quote:

Originally posted by gq_626
I understand that. But what we're talking about is the potential for a faulty or defective sensor....not the normal progression of pre-ignition.

Definately possible. He already had the recall done, but Nissan has had problems in the past of letting defective parts get out into inventory as well. On my old spec v, I had the fuel sending unit replaced due to hard starts. I still had the same problem, the tech said that the FSU was bad. So they replaced my defective part with a defective part (3rd FSU worked great, no more probs).