Tuning turbo time!

[rallycinq]

they not supposed to be tight, or they get stuck when they hot

tight as in piston-ring tightness?

Yup, there is tight as a good thing, then TIGHT as a bad thing. Needs a look at the top ring to make sure its not binding.

Cheers

SPD

 

[craigb244]

might of worded it wrong... its the good tight

the pistons without rings have a tiny bit of play and the rings are tight... its all perfecto

all in and torqued up! took longer then expected but i did it all as clean as neat as i could. might as well get it all right on the first go.

 

[arc]

aye if it's too tight then something is wrong and it's not good. things get stuck and damage gets done

 

[rallycinq]

might of worded it wrong... its the good tight

'virginal tight'

Cheers

SPD

 

[craigb244]

oh and yeh as rallycinq said i checked each ring in the bore to see how big the ring end gap was. all look good but i guess if they wasnt the engine would be foobed already

only think im a little concerned about is the pistons are not relived for the 8valve head. im guessing it will be fine(trickers is fine) might just stop it been a non-interference engine

 

[Munkul]

will it not raise the CR as well?

 

[arc]

16v pistons and 8v crank / block will lower the CR

 

[Munkul]

ah ok

 

[craigb244]

yeh the pistons are really dished compared to the 8v that are pretty flat.
it prob wont make any more or less then just using a spacer plate but I like the idea it keeps the engine more to its original design. plus one less thing to fail.

 

[Munkul]

so it means you can run high boost without a spacer plate? nice, means squish will be better as well.

 

[craigb244]

so it means you can run high boost without a spacer plate? nice, means squish will be better as well.

yep that what i ment the piston squish band should be the same as what fiat designed. also the head height is the same and so cam timing is fine

 

[Munkul]

isnt cam timing the same anyways?

 

[craigb244]

raising the head advances the timing

 

[Munkul]

you could set it back to normal though... i dont see why it would affect anything, apart from possibly needing a longer belt...?

 

[Slosei]

The valves wont hit tops of the pistons unless the crank gear slips a fair bit but my old head had around 1mm skimmed off
good work
how did you deglaze the bores?

 

[arc]

you can set it back, by buying a vernier cam pulley.

you dont time the 8v with the pulley loose like you do a 16v

 

[craigb244]

you could set it back to normal though... i dont see why it would affect anything, apart from possibly needing a longer belt...?

yeh you get adjustable cam pulley.

The valves wont hit tops of the pistons unless the crank gear slips a fair bit but my old head had around 1mm skimmed off
good work
how did you deglaze the bores?

thats good then.. ill check in anyway with an old head gasket (ill try a bit of playdoh to see how close things get to)

I used a fine hone. I have quite a few tools for messing about with the bores of engines because of the bikes.

 

[craigb244]

"fixed" the dodgy waste gate positioning:slayer:

 

[Slosei]

Awwww thats a cute little turbo lol
use an air line or a foot pump to pressure up the actuator to make sure it works fine and set the gate pressure

 

[rallycinq]

Most BMW M series cars


Kristian

No, well, not yet anyway. No M cars have been turbos.

Cheers

SPD