H engine in 9-5?

True. That was my point. Pistons in standard car engines are shrinking just as they did for F1 engines. Saab is doing it to get lower fuel consumption and for the environment, F1 teams are doing it to get higher revs and more power. Unfortunately this trend is making the pistons weaker. The intention with the series of piston images was to show the progression from the almost bulletproof B202 engine to the short lived F1 engine and how close the current B2x5 pistons are to the "short lived" end of the series of images.

At 105k my 1993 2.0 CSE LPT just goes on and on, smooth as ever. I do change oil & filter at 3000-4000 miles, fully synthetic 5W40, but otherwise very little servicing. It gets a blast of sprint now and then, but only when the engine is fully warmed up.

Sorry for the long delay!!!!!

The big reason for reduction in piston size is that piston mass is reduced and therefore reversal losses have been reduced. This is increasingly important as revs go higher since the reversal loss varies as the square of the piston velocity.

Sorry again but the profession has had me out of town and then I was in Canada with the family for an extended holiday season.

Malcolm

No problem at all! Glad to see you again.

That makes sense. I've got the engine almost ready to drop out. Would have been this weekend but it'll be wicked cold in Wisconsin this weekend, so it's going to wait. I'll post post-mortem pictures once have them.