JDM FP-DE swapped into 2002 Protege

[JDM323J48]

...i wish they made forged parts for the FP; but the thing is that because the rods are shorter on the FP and not pencil thin ones like on the FS... so in theory, the FP doesn't need to have forged rods as much as the FS does.


and dacquesta1, are you getting the FS transmission?

deck height is shorter on the fp rods and pistons are the same, only different crank and block.

 

[Ice88]

Rods, crank, block are all different as well as cams.

 

[carbumble]

Yes , I installed the FS transmission 5speed

 

[Ice88]

Nvm: forgot your going from fs to fp not fp to fs.

 

[Installshield 2]

Rods, crank, block are all different as well as cams.

yeah...the FP uses even shorter rods than the FS, but maintains a better rod ratio due to the reduction in stroke from the FP crank...The block is shorter...and the FP pistons are slightly different to gain compression back from the shorter rods...FP pistons in an FS engine will give a slight bump in compression up to 9.4:1, so the FP pistons have slightly taller skirts...the difference to the crank is only in sweep...bearing to big end length is 3.5mm less than the FS iirc, for a stroke reduction of 7mm...but big end and main bearing diameter is identical...the crank support plate is also the same from what i remember...

the only thing on an FP that is truly identical is the head...exact same in every way... same valves, same port sizes, etc...and Ice, i thought the FP did use the same cams? but maybe that was a US only thing or something...there are lots of different cams for the F family of engines around the world, so i don't know exactly off the top of my head...

lastly, i thought the FP engines used F-series gear boxes as standard...but a G-series will bolt right up to it...is that wrong?

 

[Ice88]

yeah...the FP uses even shorter rods than the FS, but maintains a better rod ratio due to the reduction in stroke from the FP crank...The block is shorter...and the FP pistons are slightly different to gain compression back from the shorter rods...FP pistons in an FS engine will give a slight bump in compression up to 9.4:1, so the FP pistons have slightly taller skirts...the difference to the crank is only in sweep...bearing to big end length is 3.5mm less than the FS iirc, for a stroke reduction of 7mm...but big end and main bearing diameter is identical...the crank support plate is also the same from what i remember...

the only thing on an FP that is truly identical is the head...exact same in every way... same valves, same port sizes, etc...and Ice, i thought the FP did use the same cams? but maybe that was a US only thing or something...there are lots of different cams for the F family of engines around the world, so i don't know exactly off the top of my head...

lastly, i thought the FP engines used F-series gear boxes as standard...but a G-series will bolt right up to it...is that wrong?

Stock FS rods IIRC are 135mm, FP rods are 129.9 or something like that. For Aussies using FP pistons in an FS equates to 9.7:1 Compression, given that FPs in the states are the same compression I would have thought this would yield the same results. What would be interesting is to use US FS pistons in a 1.8 for boost

FP has different cams though the exhaust cam from memory is very similiar to that used by FSs. Unsure if same cam just ajusted slightly, but they have different intake cams

 

[JDM323J48]

so with custom crank work and fp rods in an fs block a stroker engine would be possible?

 

[Ice88]

There was long ago a stroker kit for the probe engines which increased the capacity to 2.2litres.

Problem with stroking is it amplifies all the qualities that make the FS engine a rather ordinary engine in the first place.