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Old 12-17-2002, 11:35 PM   #1
Subarusalesman
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Default Engine specifications - Bore & Stroke etc.

What is the bore & stroke of the normally aspired 165 hp Subaru 4 cyl. engine, & how does the WRX 2 litre engine differ from it, besides being turbocharged?
What is the bore & stroke of the new H6 engine?
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Old 12-17-2002, 11:53 PM   #2
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The bore of the NA EJ25 is 9.96, and the stroke is 7.9, the WRX engine has a bore of 9.20, and the stroke is 7.5. I don't have info on the H6 though.

-Wes
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Old 12-18-2002, 10:46 AM   #3
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in what units are you speaking? I KNOW those aren't inches and they don't look metric either...
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Old 12-18-2002, 12:34 PM   #4
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They're in centimeters.
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Old 12-18-2002, 02:05 PM   #5
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The normally aspirated 4 cyl Subaru engine that is rated at 165 hp in the US is called the EJ25 by Subaru, the H6 engine is called the EZ30 and the 2 liter engine is called the EJ20.

Here are some 2002 specs:

Bore x Stroke (mm), compression ratio
EJ20 - 92 x 75, 8.0:1
EJ25 - 99.5 x 79, 10.0:1
EZ30 - 89.2 x 80, 10.7:1

The EJ20 and EZ30 both have dual overhead camshafts in each head whereas the EJ25 uses a single overhead camshaft. The EJ20 and EJ25 both utilize a single belt to drive all of the camshafts whereas the EZ30 uses a separate chain for each head. The EZ30 employs a variable-length induction system while the EJ20 and EJ25 both use a fixed-length induction system.
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Old 12-18-2002, 02:16 PM   #6
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ah-ha... I should have figured that one out... sometimes I wonder if my brain still works...
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Old 12-19-2002, 02:00 AM   #7
RebelINS
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I probably should have included the units in my original post, sometimes I just don't think when I am typing.

-Wes
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