23 replies to this topic

[gaffer1986]

[Nev]

That is Alex's car. It was an inherited engine he got in the car when he bought it, he was getting 550 BHP out of it when drag racing and it blew up. He has since built a brand new engine (with a little help from me  ) which has stood the test of time (even with a massive GTX3552 strapped onto it).

 

The car is now up for sale if you like, faster even than Nipper

 

To directly answer your question, when you try to get that much power from a 2 litre engine, the slightest weakness or wear in any part can cause "explodo", as the parts are terribly stressed. I doubt even Alex would know precisely why it failed, even after taking it all apart, as it would have been 1 gigantic metallic mess spinning round at 8000 RPM at 150 MPH.

 

Edited by Nev, 08 September 2016 - 06:30 PM.

[fezzasus]

Aluminium pistons interfere with cast iron blocks when at full temperature. Looks like the piston seized from extreme thermal expansion.

[fiveoclock]

All that work and with a few stickers on the car he could have got the same power

[Nev]

All that work and with a few stickers on the car he could have got the same power

 

LOL, ah yes, more stickers and more pointless carbon bits would have helped immensly!

Edited by Nev, 08 September 2016 - 06:53 PM.

[Mattias]

This is how you get real turbo POWER!!

 

https://www.youtube....h?v=uxPEppo0nn8

[CHILL Gone DUTCH]

This is how you get real turbo POWER!!  

Maybe this is the answer to make the ac cars quiet

[gaffer1986]

Haha, great Australian accents! I had a feeling someone on here would know who's engine it was. I've never seen an engine split before but the aluminium pistons / cast block and lots of temperature makes sense. What engine do you have Nev? You strike me as a function over fancy pance man given your comments about my tat rubber and leather wheel.

[Nev]

Haha, great Australian accents! I had a feeling someone on here would know who's engine it was. I've never seen an engine split before but the aluminium pistons / cast block and lots of temperature makes sense. What engine do you have Nev? You strike me as a function over fancy pance man given your comments about my tat rubber and leather wheel.

 

Fezassus is presuming a lot there, a number of things could have caused the engine to fail, just cos one piston was mashed doesn't necessarily mean it siezed due to thermal expansion. It could easily have been the crank that snapped first, or big end bolt failure, or a crack in the block etc etc.

 

The engine in my car is a Frankensteinian creation of various bits, some bought new, some machined/modifed from OEM spec. It's base is a Z20LET still though.

Edited by Nev, 08 September 2016 - 09:16 PM.

[fezzasus]

 

Haha, great Australian accents! I had a feeling someone on here would know who's engine it was. I've never seen an engine split before but the aluminium pistons / cast block and lots of temperature makes sense. What engine do you have Nev? You strike me as a function over fancy pance man given your comments about my tat rubber and leather wheel.

 

Fezassus is presuming a lot there, a number of things could have caused the engine to fail, just cos one piston was mashed doesn't necessarily mean it siezed.

 

 

Engine failure analysis is part of my job. no presumptions here

[Nev]

 

 

Haha, great Australian accents! I had a feeling someone on here would know who's engine it was. I've never seen an engine split before but the aluminium pistons / cast block and lots of temperature makes sense.

What engine do you have Nev? You strike me as a function over fancy pance man given your comments about my tat rubber and leather wheel.

 

Fezassus is presuming a lot there, a number of things could have caused the engine to fail, just cos one piston was mashed doesn't necessarily mean it siezed.

 

 

Engine failure analysis is part of my job. no presumptions here

 

 

Sheesh, you can't look at a few still shots in video and draw a conclusion about an engine failure you know nothing about !

 

I was intrigued myself what might have caused it so I emailed him last night, here is his response:

 

 

 

 

So it seems you are quite wrong.

Edited by Nev, 09 September 2016 - 07:50 AM.

[fezzasus]

 

 

 

Haha, great Australian accents! I had a feeling someone on here would know who's engine it was. I've never seen an engine split before but the aluminium pistons / cast block and lots of temperature makes sense.

What engine do you have Nev? You strike me as a function over fancy pance man given your comments about my tat rubber and leather wheel.

 

Fezassus is presuming a lot there, a number of things could have caused the engine to fail, just cos one piston was mashed doesn't necessarily mean it siezed.

 

 

Engine failure analysis is part of my job. no presumptions here

 

 

Sheesh, you can't look at a few still shots in video and draw a conclusion about an engine failure you know nothing about !

 

I was intrigued myself what might have caused it so I emailed him last night, here is his response:

 

 

So it seems you are quite wrong.

 

 

Or he is. It's interesting how you take some words as gospel.

 

Here are a few other quotes you might like;

 

 

 

[color=rgb(40,40,40);font-family:helvetica, arial, sans-serif;]when you try to get that much power from a 2 litre engine, the slightest weakness or wear in any part can cause "explodo", as the parts are terribly stressed. I doubt even Alex would know precisely why it failed, even after taking it all apart, as it would have been 1 gigantic metallic mess spinning round at 8000 RPM at 150 MPH.[/color]

 

Oh, and this one for good measure;

 

https://sites.google.../07---update-16

 

 

 

Lets hope this thing can survive the expected 900 degree centigrade temps of my exhaust gas *gulp*. It should do, and if it doesn't it has a lifetime waranttee that I know Jay will honour.

[phippsy]

 

 

 

 

Haha, great Australian accents! I had a feeling someone on here would know who's engine it was. I've never seen an engine split before but the aluminium pistons / cast block and lots of temperature makes sense.

What engine do you have Nev? You strike me as a function over fancy pance man given your comments about my tat rubber and leather wheel.

 
Fezassus is presuming a lot there, a number of things could have caused the engine to fail, just cos one piston was mashed doesn't necessarily mean it siezed.

 

 
Engine failure analysis is part of my job. no presumptions here

 

 
Sheesh, you can't look at a few still shots in video and draw a conclusion about an engine failure you know nothing about !
 
I was intrigued myself what might have caused it so I emailed him last night, here is his response:
 
 
So it seems you are quite wrong.

 

 
Or he is. It's interesting how you take some words as gospel.
 
Here are a few other quotes you might like;
 

[color=rgb(40,40,40);][font="helvetica, arial, sans-serif;"]when you try to get that much power from a 2 litre engine, the slightest weakness or wear in any part can cause "explodo", as the parts are terribly stressed. I doubt even Alex would know precisely why it failed, even after taking it all apart, as it would have been 1 gigantic metallic mess spinning round at 8000 RPM at 150 MPH.[/color][/font]

 
Oh, and this one for good measure;
 
https://sites.google.../07---update-16
 

Lets hope this thing can survive the expected 900 degree centigrade temps of my exhaust gas *gulp*. It should do, and if it doesn't it has a lifetime waranttee that I know Jay will honour.

 

 
Handbags ladies

[Nev]

Making incorrect snap presumptions like that with barely any info, hardly a scientific analysis was it?! Even though he is shown to be wrong he just brings up flack and never admits it.

 

I have no idea how that engine even survived to 300 BHP without a girdle. Now that I know that it didn't even have one, it is pretty damn obvious that would cause a problem, nothing to do with a seized piston.

 

For the OP who asked the question in the first place, the girdle is a webbing ladder/lattice that mounts underneath the crank of the engine in an effort to stop the whole block twisting from torque. On the Z20LET and C20LET it is a cast iron standard part that mounts with about a dozen pretty beefy bolts. All 200 BHP factory engine would have this.

Edited by Nev, 09 September 2016 - 10:57 AM.

[Mattyboi]

Come on fellas, no need really.

 

Engine failure analysis is part of my job to and I'd have leant towards piston seizure based on the available information* and the assumption it was built correctly. Nev found out its wasn't so that changes the picture considerably. 

 

No one could know for sure without all the information, it would just be a best guess. No winners or losers here.

 

 

*sketchy video that shows no detail, aluminium pistons, broken block and highly tuned.

Edited by Mattyboi, 09 September 2016 - 10:50 AM.

[siztenboots]

Standard z20xxx spec varies , some have the balancer shafts and from memory this is integrated into a framework , similar to the x20xev frame. Probably the latter is a stronger piece.

[gaffer1986]

Just caught up with this thread, didn't mean to start a falling out. Interesting to know what a girdle is though and the possible reasons that a engine block could split so thank you both for your responses.

[fezzasus]

Just caught up with this thread, didn't mean to start a falling out. Interesting to know what a girdle is though and the possible reasons that a engine block could split so thank you both for your responses.

 

The split block wasn't the cause, it was a result of the crankshaft flexing too much (to the point of it snapping) from being a fundamentally out of balance revolving mass. A girdle is used to limit the amount of crankshaft flex.

[gaffer1986]

I see, so the crank shaft split the block.

[Exmantaa]

A girdle plate is used in the ©Z20LET(H) engines to tie the main bearings together and to the outer block casing, thus stiffening everything up: (is a mains girdle not part of a balancer delete kit for those engines?)

 

.

 

(Have to say that my first thought was a main bearings/lack of a girdle plate seeing that crank snapped in half... )