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Old 02-06-2010, 08:18 PM   #1
Sean2.5Black
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Member#: 150647
Join Date: Jun 2007
Chapter/Region: NWIC
Location: Beaverton, OR
Vehicle:
98 Impreza 2.5RS
Ej20G hybrid

Default Weird noise @ 2k and 3k RPMs

ej20g short block
ej25d heads

Hey guys, just recently started hearing a weird knocking noise at 2k and 3k rpms... It goes away before/after these rpms and it gets quieter when at WOT... I feel no power loss and I can't figure out what it is...

My question is: Isn't a rod knock supposed to make that loud knocking noise throughout the RPM range and have massive amounts of power loss?

Thanks for any and all input.
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Old 02-07-2010, 02:44 AM   #2
Marnix
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Join Date: Dec 2003
Chapter/Region: International
Location: The Netherlands
Vehicle:
1984 AM5, 1994 BC4,
2010 BR5

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That rev range is typical for rod knock. Is it louder when the engine is hot?
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Old 02-07-2010, 03:44 AM   #3
Sean2.5Black
Scooby Specialist
 
Member#: 150647
Join Date: Jun 2007
Chapter/Region: NWIC
Location: Beaverton, OR
Vehicle:
98 Impreza 2.5RS
Ej20G hybrid

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Quote:
Originally Posted by Marnix View Post
That rev range is typical for rod knock. Is it louder when the engine is hot?
It's actually louder when cold, but seems more constant when hot... Like it lasts longer (by a few hundred rpm) during that 2k and 3k...

Also, there is no metal flake in my oil... I will be changing it again friday just to check again.
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