Well for those that don't know, I blew my engine ~14 months ago.. I just got around to tearing it apart...

2 of the allen screws were stripped out, so I did not get all the pistons out... but I got the broken one out...

Blown one VS Normal one







All in all is was not that hard....

Here's a shot of the cylinder...




Not to much damage inside of it... I think it could be reused.. just needs to be cleaned.. don't know what I am going to do with all of this

Anywho.. just thought I'd share.

And FWIW.. I was finding little parts of piston all over the timing chain

 

thanks for the pics

 

The skirt load pattern on that one good piston looks interesting. I have never seen Nissan pistons that were worn like that. Also the color of the oil coking looks as if you were running extended oil change intervals.

 

I'm glad you brought that up, I forgot it smelled like there was cooked oil all over the place...

I change it between 2700-3000.... synthetic

 

Then perhaps you FI people need external oil coolers. 5w-30 oil needs to be kept in the 210º or below temp. range.

 

detonation or something else? with it being the skirt i wouldn't think it'd be detonation... but i have no idea

 

4 bolt mains with a girdle from the factory. beat that you damestics

 

supposedly the VH45DE from the Q45 is even crazier... can't wait to pull the pan on mine.

 

How did you blow the engine?

 

I know my 1UZ-FE (Toyota/Lexus v8) has a 6 bolt main, maybe the VH45 is the same

 

Yes, all Nissan V8s have 6 bolt mains.

But you guys should see the crazy girdle on the VQ40. It has the 4 bolt mains but essentually a 6 bolt girdle. And the huge main cap/girdle/skirt is all one piece.

 

wow, havent had a chance to see anything other than the VQ30

have any pics? that would be cool

 

to much boost, not enough fuel

 

damn i hope that doesnt happen to me anytime soon

 

I am pretty sure that the VQ motor is a 4-bolt main because it is an aluminum block, as opposed to an iron block. The VG and VE motors have a 2-bolt main, and we all know those blocks are especially strong stock.

 

yuppers, there's a picture of the vq 4 bolt main and girdle up top

 

Kirk, do you have a shot of the top of the broken piston?

 

I will.. I can take pics of anything you like

 

Here you go stephen.. I wonder why it is discoloured where I put the red arrow.. maybe detonantion?

 

Lean condition. Too much heat.

 

http://www.streetrodstuff.com/Articl...ion/Page_2.php


You were lean.

 

Looks like a piston out of my 1.7ltr VW rabbit motor with 7lb boost and a 250hp shot of NOS. It lasted about 6 5sec NOS shots then she blew.

 

Or in my case..all 3..

and I thought I was lean

 

i was looking at some pictures of a VH45 and it looks like it actually only has a 4 bolt main...

 

It's 4 from the top. The 6th bolts go into the side of the caps.

 

Mmmmmmm. Nice, shiny engine parts!

 

awesome... even more bragging rights against the "other" V8 guys...

 

too much heat (from a lean condition) and the piston "melted" out of shape then its like trying to shove a square through the cirle just doesnt fit right

 

how much boost were you running man?
type of injectors?

 

Yep.. definatly a detonation failure. It rocked the piston so hard in the cyl it shatterd the skirt!!! Now if we could get the wife to do that more often
What cyl did that happen on? I could not tell from the pic's.
I'm betting it was on the back side of the engine (closest to the fire wall)
One of those right? That would confirm my fuel rail theory of the rear 3 cyl being lean if you VE guys have a similar rail setup.
You have a different engine in now or just a lawn orniment?
~Scott

 

Actually that engine would be the VQ30DE. If I remember correctly the fuel rail flow is just the opposite of the VG's and I want to say the VQ's use top feed injectors. Is this right guys? By the looks of the cylinder head that's off in the above picture I'd say that one of the pistons in the front bank died.

iirc VG fuel rail flow: 6 -> 4 -> 2 -> 1 -> 3 -> 5 -> fpr

 

The VQ30DE's use side-feed injectors. DE-K injectors are top-feed.

And the VQ fuel rail flow is the same as what you posted.

 

I agree that the VG fuel rail flow is as you stated Mark.
Nismo.. you stated that teh VQ is the same then...

What cyl was it then?>>?????
Scott

 

the VE rail goes 5 -> 3 -> 1 -> 2 -> 4 -> 6 -> FPR

just to straiten some things out

the VE is in the 92-94 SE maxs
the VQ is in all the 95-99 maxs
the VE and VQ share the same injectors 259cc

 

more than likely had it of been detonation the top of the piston above the ringland is the most typical part to break and it usually breaks completely off in spots the pictures that im looking at there doesnt seem to be any substantial damage above the ringland except for where it looks like it has scraped which would have occured after the other damage......correct me if im wrong.

 

The FRONT bank.. IIRC it was the passenger side.. it was the outer cylinder