Alpina B7 Turbo pistons on EBay

[RobertRO]

I have no affiliation with this bid.
I just found it on EBay and I thought that some of you turbo guys may find it interesting.

BMW ALPINA B7 Turbo Kolben e28 e24 Turbokolben 6Stk.

[Duke]

I am sure they are much heavier than the JE pistons TCD sells.

[RobertRO]

I wonder, what is the purpose of the offset "ditch" on piston top?

[russc]

I wonder, what is the purpose of the offset "ditch" on piston top?

Valve clearance.

Im not sure there is anything special about those pistons.

RussC

[Shawn D.]

I wonder, what is the purpose of the offset "ditch" on piston top?

It looks as if they're trying to maintain some of the "quench" area on one side of the chamber. I doubt it's for valve clearance, as almost the whole piston is done that way (the small "ditch" is actually the raised portion).

[atle28e]

I am sure they are much heavier than the JE pistons TCD sells.

Ofcourse its duke with his anti-tcd comments. Tcd you must get tired of everything performance related being compared to you

[Shawn D.]

I am sure they are much heavier than the JE pistons TCD sells.

Ofcourse its duke with his anti-tcd comments. Tcd you must get tired of everything performance related being compared to you

Uhh... that was a pro-TCD comment by Duke. It's Dinan that Duke rails against, not TCD.

[M635CSi]

I have no affiliation with this bid.
I just found it on EBay and I thought that some of you turbo guys may find it interesting.

BMW ALPINA B7 Turbo Kolben e28 e24 Turbokolben 6Stk.

No doubt the pistons Alpina sourced back then were pretty good. By today's standards, there are much lighter and stronger pistons available which also allow lower friction rings.