Strength of FP/F25M-R
- Thread starter Sleepy
- Start date
- :
- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
there are alot of variables involved in this question but i am going to give a rough estimate of between 170 and 200 horsepower
- :
- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
Sleepy said:
there are currently little to no forged internal solutions for the 1.8, believe me i have searched high and low for them
twilightprotege
Member
- :
- 2001 323 Astina SP20 (P5)
there is probably a rod from another car that fits. the sr20de rods are very close to the stock fsde rods (only slightly longer and slightly wider at the big end which can easily be machined).
how long are the fp rods???
how long are the fp rods???
Don't know any measurements, just that it has a different part number, costs $1 less than FS rod and has a different main bearing part number so might not be interchangeable on the crankshaft either, regardless of length. Also read on this forum how the FS crank and rods won't work in FP(sticks out top of block by an inch?)
twilightprotege
Member
- :
- 2001 323 Astina SP20 (P5)
you could try and get away with the toyota 3sgte rods (138mm long vs what i think is the FP rods 138.7mm), but a lot depends on the big end bore. the fp (and 3sgte) rods have a 2.008" bore. i'm going to try and use these rods in my engine...to give a 1.5:1 rod ratio (better than 1.469:1)
twilightprotege
Member
- :
- 2001 323 Astina SP20 (P5)
fp rods - best guess. assuming the block is the same height, the crank has a 3.5mm shorter radius, so you'd then assume the rods would have to be 3.5mm longer to make up the different. big assumptions here...
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- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
some insight for you 1.8 guys;
this summer we helped FlyinHawaiian redo his FP engine. our assumption initially was that the block was identical as was the crank and the only difference between the two engines was the rod length. after going through numerous combinations we came to the conclusions such as;
using forged rods for an FS, forged pistons for an FS, FP crankshaft and FP block - rods would strike cylinder walls upon attempted rotation and pistons would clear deck height, exposing the top piston ring
using forged rods for an FS, forged pistons for an FS, FS crankshaft and FP block - rods would no longer make contact with cylinder walls but pistons would exceed overall deck height by about 3/4 of an inch
obviously the only option for him was to simply step up to a 2.0 FS block at that point as no amount of mixing or matching between the two was working
this summer we helped FlyinHawaiian redo his FP engine. our assumption initially was that the block was identical as was the crank and the only difference between the two engines was the rod length. after going through numerous combinations we came to the conclusions such as;
using forged rods for an FS, forged pistons for an FS, FP crankshaft and FP block - rods would strike cylinder walls upon attempted rotation and pistons would clear deck height, exposing the top piston ring
using forged rods for an FS, forged pistons for an FS, FS crankshaft and FP block - rods would no longer make contact with cylinder walls but pistons would exceed overall deck height by about 3/4 of an inch
obviously the only option for him was to simply step up to a 2.0 FS block at that point as no amount of mixing or matching between the two was working
twilightprotege
Member
- :
- 2001 323 Astina SP20 (P5)
so the rods in the FP dont give a decent rod ratio either???
- :
- 2002 BJFW, 2007 BK3P, 1979 SA22C, 2005 BK3P
Sleepy said:
he used the 1.8 transmission it bolts up to the 2.0, so he kept his axles and transmission. i donated the FS block to him to get him on the road.
twilightprotege
Member
- :
- 2001 323 Astina SP20 (P5)
sleepy - tripoint cam gears, but i can get some made up for you. install just as easy as changing cams (if that's easy for you). they are however not dialed in (aka not tuned yet)
