2.5 rod length vs 2.2 rod length

Heads, valves, pistons, rods, crankshaft, etc...

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georryan
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2.5 rod length vs 2.2 rod length

Post 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.
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PhyrraM
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Post 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.
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douglas vincent
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Post 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.
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Post 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.
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georryan
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Post by georryan »

Awesome! Thanks guys!
91 Pearl White Sport Sedan
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2014 Volvo S60 T5
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87 Grey GL-10 Sedan (so long old buddy) - donated
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