CrispToast
Member
- :
- 2002 Protege5
I am in the midst of rebuilding a core to replace my FS-DE engine that threw a rod in my 2002 P5.
While studying this engine online I've seen numerous references to installing the FP-DE pistons in the FS-DE. While there are strong visual similarities between the two pistons, it appears the FP pistons have a .026" longer compression height which can be compensated for with a thicker head gasket. However, the piston pin diameter on the FP is 1mm larger than the pin on the FS. So, different connecting rods are necessary to make this work as well.
FP rods won't work because the c-c length and big end diameters are too small. Are there any OEM mazda parts out there to make this work? I've read the Euro-spec FS-DE used these pistons to attain 9.7:1 compression. Did they use a different P/N piston or rod in those engines?
Has anybody around these forums actually done this on a U.S.-spec engine?
If it's possible to do this without waiting six weeks for custom parts I'd like to have a slightly highers C/R for crisper throttle response and potentially better mileage.
Thank you for reading.
While studying this engine online I've seen numerous references to installing the FP-DE pistons in the FS-DE. While there are strong visual similarities between the two pistons, it appears the FP pistons have a .026" longer compression height which can be compensated for with a thicker head gasket. However, the piston pin diameter on the FP is 1mm larger than the pin on the FS. So, different connecting rods are necessary to make this work as well.
FP rods won't work because the c-c length and big end diameters are too small. Are there any OEM mazda parts out there to make this work? I've read the Euro-spec FS-DE used these pistons to attain 9.7:1 compression. Did they use a different P/N piston or rod in those engines?
Has anybody around these forums actually done this on a U.S.-spec engine?
If it's possible to do this without waiting six weeks for custom parts I'd like to have a slightly highers C/R for crisper throttle response and potentially better mileage.
Thank you for reading.
