Machining std pistons
Turbo Mini Forums

Hi guys does any one know of a link or have any info on machining the dish on std turbo pistons been looking but the search button no like me today!!
Thanks mike

Forget my last lads just found what I need! I will take myself outside for bare bottom spanking for my stupidity lol

Edited by 998-city-rat on 5th Jan, 2012.

Please share what you found

Pedro Silva

http://miniciados.blogspot.pt/

This is the best I have found so far


Basically cut the dish 5mm deep with a 6mm radious cutter leaving 5mm from the outer edge at the squish band. that resulted in the most even crown thickness and gaining another 4cc over an unmodified piston.

Note though that the pistons were removed from the rods, and that is the difficult bit.

Mike

Yes mr sprocket the previous statement is all yours it's amazing what that ol search button can bring up, top work

I think that picture is of the sectioned piston that accompanied the ones now in the A35 - right, Colin ?

The engine in Alex-B's old frag (whereever it is now) also had a very similar set of pistons machined for me, in about 1998, LOL.

on the pic of the piston it says 5mm deep, 5mm from the edge, but its looks to be machined twice as deep compared to the material thickness left on the outer edge of the piston in the picture.
so does that mean 5mm deep and 5mm dia not radially in from the edge?

Edited by wez on 6th Jan, 2012.

one day boost will be mine!

Edited by Sprocket on 6th Jan, 2012.

On 6th Jan, 2012 Sprocket said:

You shouldn't have gone to SpecSavers

That picture is 5mm deep 6mm rad, and 5mm squish band

one day boost will be mine!

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Edited by Sprocket on 6th Jan, 2012.

the red lines just show up the difference more, if both are supposed to measure 5mm then fair enough. it was just obvious from looking that the 2 areas aren't the same size. thats why i asked about how the measurements are taken. the difference is alot less than the amount i was initially thinking. but i wont bother booking at specsavers just yet, the lines show my eyes work just fine

Edited by wez on 6th Jan, 2012.

one day boost will be mine!

No I think you'll find that my comment on specsavers suggests that you have already been, got their specticles and have worse eyesight, like the thousands of other people that use spec savers for their eye focal correction devices.

I'm still not sure how you would consider the two dimentions so different, that you have to be so pedantic about the lack of my drawing ability. what you don't seem to take into consideration is that there is a small radious on each edge of the squish band which makes it appear narrower, but it is certainly does not look half the deapth as you first suggested.

I'll say it again, wether the picture looks like it or not, the dimentions are 5mm deep 6mm rad 5mm wide squish band.

:)

im not being pedantic at all, just an observation, and i also did just say

one day boost will be mine!

alrighty then