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Old 04-09-2009, 12:37 AM   #1
williaty
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Default Oiling an EJ253 At Very High RPM

So the new cams are in my EJ253 (SOHC NA, yes, I realize I'm a loonie for working on it). They require 7,000RPM to make any gains at all and breathe well enough at 7k that I'd like to bump the redline to 8k and see just how high they'll keep breathing. Stock redline on this car is 6kRPM. So I'm already 1kRPM above stock redline and considering 2kRPM above stock.

The EJ253 comes with a small oil pump, I've seen 6mm and 7mm mentioned in posts, not sure which is right. To spin the engine to 7k, or even 8k, which oil pump should I swap to? 10mm? 11mm? 12mm?

Yes, I realize that this is only one of several issues I need to look at.
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Old 04-09-2009, 05:21 PM   #2
Homemade WRX
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Get a 10mm pump as too big can be bad. The issues I think you may run into lie in the bearings; both material (not sure if they are the same p/n as EJ255/7) and clearance.
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Old 04-09-2009, 11:52 PM   #3
ballitch
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98 cam'd EJ251
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Some N/A motors come with 10mm pumps on them. Dont know which ones, but it's really easy to read a number on the front of the pump to find out. I got one on my Phase I EJ25 block I bought years ago.

I cant remember exactly, but do your heads have upgraded springs and retainers?


~Josh~
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Old 04-09-2009, 11:57 PM   #4
williaty
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Nope, that's one of the other issues I'm going to have to be dealing with.
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Old 04-10-2009, 02:27 AM   #5
jamal
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A 10mm pump should be okay. I think it's what comes on the 2.0s that go to 8250. I would be most concerned about the valvetrain.
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Old 04-10-2009, 11:52 PM   #6
yarrgh
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stock RS's came with a 9mm (at least my 01 did) and I believe newer ones came with a 7mm (the 2005 I rebuilt did). I put a 10mm on and haven't looked back. Make sure you port match.
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Old 04-11-2009, 12:29 AM   #7
Chi_San
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Regardless of the pump, it might be a good idea to hook up an oil pressure gauge after you get the car up and running, if you weren't planning on doing so already.
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