924Board.org

[Britain]

I snapped this picture this past weekend showing the three different types of pistons that I have found when tearing some engines apart.

As per Dan Beckett:
The left is an NA US spec piston, sits 6mm down from the deck. It will have the pin in a different location than the other two.
Middle piston is 7.5:1 US spec series 1 931 slug.
Piston on right is 8.0:1 US spec series 2 931 slug.

https://scontent-sea1-1.xx.fbcdn.net/hphotos-xpa1/v/t1.0-9/12348016_10205209598346097_5623513119092985808_n.jpg?oh=a8e09713ca7e60cd51ac209827cefad3&oe=56E2673C

https://www.dropbox.com/sc/txrir8w0s55ntqh/AACirgkXISWb70bjDrQ9lscpa

-Britain

[Kenodog]

Not quite sure what your point is. We all know the pistons are different between the engine models.

Did you happen to find a set that were actually 'different' than the factory slugs from various versions ? i.e. a custom set or something someone has roughly cross-referenced from a different manufacturer and installed in a 924 block ?



Leigh
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[fiat22turbo]

The one with the offset dish threw me for a loop, I guess.
_________________
Stefan
1979 924 Carrera GTS (clone-ish)
1988 944 Turbo S (Silver Rose)

[Kenodog]

I have 4 complete sets of those in boxes. Standard S1 slugs.





Leigh
_________________
1979 Euro 931, Olive
1981 931, Sabine
1991 Ford Ranger XLT 4x4, Ricky
1996 Ford E-350 ex-FedEx Van
2014 Mazda CX-5 (Kinderwagon)
2019 KTM 790 Adventure
2024 KLX300
2024 KLX140

[Carrera RSR]

The S2 piston has been det'ing like a good 'un
_________________
1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252