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2.5 rod length vs 2.2 rod length
Posted: Fri May 16, 2008 11:20 pm
by georryan
Does anyone have any numbers on the difference in the connecting rod length? I'm seeing some float around but they seem the same, but I don't think the are. I can't seem to figure out which ones are center to center and which are end to end.
Posted: Sat May 17, 2008 1:19 am
by PhyrraM
To my knowledge all rods are measured center to center.
2.5 Rods are longer than 1.8/2.0/2.2 rods.
The exeption might be 2.5 STI rods. I've heard they are the same as 1.8/2.0/2.2 rods. Doug or Matt will be the men to say for sure.
Posted: Sat May 17, 2008 3:50 am
by douglas vincent
WRX ej20 1998 and older are 130.5 mm
WRX ej20 1998 and newwer are 130.5 mm
ej25 SOHC rods are 131.5 - 131.6 mm
?/? NA ej25 1999 and up haev 131.25 mm
EJ257 has 130.5
ej22t has 130.5
So how do you measure center to center?
You take some calipers, measure inside to inside, then add 1/2 the diameter of the crank and 1/2 the diameter of the wrist pin.
Posted: Sat May 17, 2008 2:20 pm
by BAC5.2
Doug,
The EJ25 rods that are 131.6mm are the phase 1 blocks (a majority of which had DOHC heads). The phase 2 blocks are 131.25 I think.
Posted: Sat May 17, 2008 8:12 pm
by georryan
Awesome! Thanks guys!