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Old 03-24-2004, 02:57 PM   #1
Storm
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Question Rod lengths on EJ25?

I need to find out if FHI kept the same rod sizes between 97-99. Reason being, I'm putting a set of STD '99 pistons into an otherwise unmolested 97 shortblock. I know that the stroke never changed, but compression ratios did, and the pistons are visibly different.

The 97's are flat top w/valve clearances....the 99's are dished like low-CR turbo pistons. I'm guessing the wristpin location is different? Will it smack the 97 heads going back on it?

I think I'll be alright, but I'd hate to end up with 5-8mm of slug sticking out of the block at TDC.

Timely replies appreciated.

Jay Storm
www.sourcemotorsports.com
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Old 03-24-2004, 07:13 PM   #2
Section 8
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I couldn't remember which years were what length. The Phase 1 engines have long rods, 2 shorter rods (only the correct rods fit the crank journals, you probably know that).

97 through 98 will be the same. 99's appear to all to have been Phase 2 blocks with some DOHC and most SOHC heads as far as the impreza's. Other models might be different. Try a post in the Legacy forum if you know where your parts came from.

cheeRS,

Greg
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Old 03-24-2004, 08:36 PM   #3
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Thanks So Much Greg! I'll be checking this height very carefully.

Jay Storm
www.sourcemotorsports.com
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Old 03-29-2004, 05:39 PM   #4
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Bumping this back up.....

How is it possible to torque the inner rodbolts? Does it take a special tool, or must they be torqued "outside" the blockhalves? None of the literature I have mentions this step.

Thanks,
Jay Storm
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Old 05-13-2004, 08:37 PM   #5
mr. m
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does anybody know the actual rod lengths?
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Old 05-13-2004, 09:53 PM   #6
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nevermind, i found them. i believe it is 132.2mm for the phase II.
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Old 05-13-2004, 09:57 PM   #7
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The rod length that I'm seeing on a spec sheet I have here is 5.162"

That would be about 13.11 cm

That's for a '98 EJ25 DOHC.
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Old 05-14-2004, 02:05 PM   #8
mr. m
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ive seen the rod length listed for the phase I as 131.7mm and have also read that the phase II rod is .5mm longer than the phase I. not a huge difference from what youve listed but enough to cause problems im sure.
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