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Piano piston shapes


bltom
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Hello guys,

 

I have came across some different piano shape piston. Somewhere in back of my mind I think I have read some article where those type of different extruded pistons where explained, but I cant remember it  now. 

 

So can someone please explain me the differences why there were two types of piano pistons, one where piano shape is not so intense?? My current one is the black one in the background paired with E12 head. 

 

Thanks in advance ;)

 

pianoIMG_6007.JPG

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So theoretically pistons with smaller piano cannot be replaced instead of bigger pianos? Overall compression ratio would me messed, but at least they wont contact with e12 head right? :D  

Edited by bltom
text correction
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Sure- you could use a matched set of 4 taller pianos- and you'd have higher compression!

 

The only bad thing that would come of that would be that you'd use a fatter cam, some headers,

a set of sidedrafts, and go a lot faster...  and be thousands poorer!

 

heh

 

t

 

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10 hours ago, bltom said:

So theoretically pistons with smaller piano cannot be replaced instead of bigger pianos? Overall compression ratio would me messed, but at least they wont contact with e12 head right? :D  

 

 

Yes...I just did this.  I had the small piano tops (8.3:1?) and replaced them with taller piano tops (9.5:1).  I have the e12 head...with a 292 cam, headers and weber 38 carb...fun!

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This table is from a Mahle catalog, I think.  In the third column I believe the 1.5, 4.5, 1.5, 6.8 refer to the dome height.  It seems to be born out by the US pistons that came out of my Tii block and the 9.5 pistons I just sourced.58ea7a3cca222_2002Tiipistonspecs.jpg.a9396e7a51a2b84429c7e92deeeca5a8.jpg

 

 

Edited by bimbill
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