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Old 08-06-2003, 02:40 PM   #1
widesuby
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Default Thicker headgasket for NA EJ25

Does anyone know where I can find a thicker head gasket for an NA EJ 25?????
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Old 08-06-2003, 03:02 PM   #2
Dr Ken
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Just out of curiosity, what are you up to, if you dont mind me asking ???
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Old 08-06-2003, 03:49 PM   #3
widesuby
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The vehicle is getting turbo'd and I need to lower the compression
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Old 08-06-2003, 04:59 PM   #4
mprezuhguy
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so what you need is, a thicker head gasket for a Turbo 2.5.
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Old 08-06-2003, 05:37 PM   #5
jeffg
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This option has been explored in the past, and it proposes a couple of problems.

First off, you dont say what year RS you are turbo'ing, but I will assume it is SOHC version.

The thicker headgasket will indeed lower the compression a little, but it will also change the cam timing on each bank of cylinders. This would normally be corrected by some adjustable cam gears, but unfortunatly no one makes any for the SOHC subaru.

Leaving the timing off may not be that serious a problem, but with the rotation of the engine and cam design it would advance one bank of cylinders and retard the other. This is a problem.

So I hate to be the bearer of bad news but a thicker headgasket will probably not work for you, unless you want to make more modifications to the cam system.

J
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Old 08-06-2003, 05:55 PM   #6
widesuby
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Thanks for the info!!!!!!!!!!!!
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Old 08-06-2003, 06:19 PM   #7
Supapooh
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Quote:
Originally posted by jeffg
This option has been explored in the past, and it proposes a couple of problems.

First off, you dont say what year RS you are turbo'ing, but I will assume it is SOHC version.

The thicker headgasket will indeed lower the compression a little, but it will also change the cam timing on each bank of cylinders. This would normally be corrected by some adjustable cam gears, but unfortunatly no one makes any for the SOHC subaru.

Leaving the timing off may not be that serious a problem, but with the rotation of the engine and cam design it would advance one bank of cylinders and retard the other. This is a problem.

So I hate to be the bearer of bad news but a thicker headgasket will probably not work for you, unless you want to make more modifications to the cam system.

J
well said.
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