4396 replies to this topic

[TFD]

Thats a benefit of a turbo. Electric boostcontrol. Low boost for the streets with streettires, high boost on track with tracktires.

[Nev]

A lot of these fast vx's still look like road cars.

It's pretty drastic to cut the arches and put on some pastic extenders, or put on a GMS clam.  

 

Yep, it is drastic, I can understand not wanting to cut into bodywork.  

[vocky]

you might want to reconsider going for 400bhp after what I have seen happen to a block

[CHILL Gone DUTCH]

you might want to reconsider going for 400bhp after what I have seen happen to a block

Please tell me what you have seen ? For the record I'm not bothered about going for any more power, just want consistant power

[vocky]

It is not an engine I built, but it was built from a brand new Saab engine. The cylinder wall cracked

 

He is still p'd off about it, but hopefully he will post the picture.

 

He needs to go Darton sleeves if he still wants to go for big bhp, the GM build book does say 400+ requires sleeves.

[SteveA]

 

you might want to reconsider going for 400bhp after what I have seen happen to a block

Please tell me what you have seen ? For the record I'm not bothered about going for any more power, just want consistant power

 

 

Look at it this way, BTCC cars only have 350bhp and they are unbelievably quick! As you say though just constant, reliable 350bhp.  

[CHILL Gone DUTCH]

It is not an engine I built, but it was built from a brand new Saab engine. The cylinder wall cracked   He is still p'd off about it, but hopefully he will post the picture.   He needs to go Darton sleeves if he still wants to go for big bhp, the GM build book does say 400+ requires sleeves.

Is this the same for z22se or just b207 And was it opened up for bigger Pistons Just curious

[CHILL Gone DUTCH]

Have you told Lee 2.2

[Exmantaa]

 

It is not an engine I built, but it was built from a brand new Saab engine. The cylinder wall cracked   He is still p'd off about it, but hopefully he will post the picture.   He needs to go Darton sleeves if he still wants to go for big bhp, the GM build book does say 400+ requires sleeves.

Is this the same for z22se or just b207 And was it opened up for bigger Pistons Just curious

 

 

Crancase wise a B207 = Z22SE (Ecotec gen 1 block), so exact same weakness.

 

For reliable 400+ you need a reinforced Gen3 block, or re-inforce the weak Gen 1 cilinder walls or fit complete steel liners like the Darton sleeves.

 

(PS; who, what? Impressive power if you can crack the sleeves... )

Edited by Exmantaa, 15 July 2016 - 09:33 AM.

[fezzasus]

Are you sure it's not down to piston-liner overlap at high temperatures? There are massive frictional losses from a standard aluminium piston in a cast iron liner, if you add extra heat into the system then it's only going to get worse. I would be looking into the thermal expansion characteristics of the piston material. This is also where differences in the B207 and Z22SE occur as the under piston oil jets are responsible for 50 % of the piston cooling

 

Where did the crack originate?

[leevx2.2]

Have you told Lee 2.2

If it happens it happens will build another bottom end

[Nev]

you might want to reconsider going for 400bhp after what I have seen happen to a block

 

Ooh that sounds worrying, I can give you a nice sturdy Z20LET iron block if you want

 

Actually even the z20LET can crack around the cylinder tops if the deck isn't semi-closed off (roughly £100 job at a machine shop).

Edited by Nev, 15 July 2016 - 11:05 AM.

[CHILL Gone DUTCH]

Thanks for offer nev but I'm happy sticking to current power levels which does not exceed the failure

[CHILL Gone DUTCH]

It is not an engine I built, but it was built from a brand new Saab engine. The cylinder wall cracked   He is still p'd off about it, but hopefully he will post the picture.   He needs to go Darton sleeves if he still wants to go for big bhp, the GM build book does say 400+ requires sleeves.

Was it a uk vx ? And what piston/rods

Edited by CHILL Gone DUTCH, 15 July 2016 - 12:06 PM.

[ArticMonkey]

Graeme's car is the only forged Saab untouched by Vocky. However it's a 2L with standard rods if memory serves me correct.

[vocky]

B207 with under piston oil jets, Wiseco standard bore pistons with gapped rings, Eagle 2.2 steel rods, standard z22se crank and a fully balanced bottom end.

 

 

Edited by vocky, 15 July 2016 - 04:00 PM.

[TFD]

These kind of things are allways a debate. Was it actually power that crackef the liner or was something else not right?

[CHILL Gone DUTCH]

Have you told Lee 2.2

If it happens it happens will build another bottom end

😜

[ArticMonkey]

These kind of things are allways a debate. Was it actually power that crackef the liner or was something else not right?

Correct. Could be thousands of things that lead to it. Bad run in process, bad mapping, workmanship of the build etc. Im not buying into the scaremongering of it all just right now. It's a classic thing that happens on this forum.

[Bargi]

Have you told Lee 2.2

If it happens it happens will build another bottom end

�

These kind of things are allways a debate. Was it actually power that crackef the liner or was something else not right?

Correct. Could be thousands of things that lead to it. Bad run in process, bad mapping, workmanship of the build etc. Im not buying into the scaremongering of it all just right now. It's a classic thing that happens on this forum.

I'm surprised the Detective Monkey doesn't already know who it is Sent from my cuntyfuckbollock phone by Twatatalk