Sheesh! Finding proper 4A-G(Z)E pistons is a mess!
The following pistons are listed with 20mm pin and 30.68mm (1.208″) compression height
- Wiseco K506M815
- CP/Carrillo SC7653
- Wössner 9035D050
- Wössner 9191D050 is strange. It has a 30.6mm compression height. WTF?
- Wössner 9278D050
…and following pistons have 20mm pin and 30.5mm (1.200″) compression height
- Supertech P4-T4AG16-20-81.5-CR11
- Toda 13010-4AG-001
- Toda 13020-4AG-001
- Toda 13040-4AG-001
- Arias AP331669
- Arias 3721070
- Arias 3731220
If my current pistons can be shaved a bit, I’ll keep them. I’d love to get the compression height from 30.68mm to 30.5mm and shave a bit off the piston crown to get dome volume somewhere around 2-3cc. This would drop the compression rate little bit below 11:1.
Otherwise I’ll get the Supertech pistons. They’re pretty damn near perfect. 🙂
Difference in compression height numbers probably comes from two pin sizes. Early 4A-GE engines had 18mm pin, later models had 20mm. Some of the companies dont seem to care about this.
I promised myself that I wouldnt get any parts from a country, which still uses imperial units. Meh…
- Supertech = imperial
- Toda = metric
- Arias = imperial
- Wiseco = imperial
- CP = imperial
- Wössner = metric
Wössner would do, they’re from Germany, but why do they have that compression height error too?
Matrix Garage has some pistons too, based on their own design.