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Old 01-11-2005, 07:42 PM   #26
powerlabs
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Would you be so kind as to give some more info on these new headgaskets?
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Old 01-12-2005, 11:54 AM   #27
Matt Monson
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not much more to elaborate. They are a three layer metal design from Cometic that measures .027 cm in thickness vs the .058 cm of stock. They are readily available directly from Cometic and from a number of vendors...
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Old 01-12-2005, 12:58 PM   #28
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I've been wondering about this incedent since I read some posts refering to the "fragged" motor.

Good job on the quick tear down / rebuild! Hope to see you around soon - we'll have to see how the new CR treats me SS....

-Chad
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Old 01-13-2005, 04:14 AM   #29
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Quote:
Originally Posted by Matt Monson
The new engine uses my original heads on a 20K mi. EJ25 out of a wrecked Legacy.
So does that mean the bored-out STi block plan was put off for now, or is the block from a new '05 Legacy block?

Quote:
Originally Posted by Matt Monson
I upgraded to .027 thin metal head gaskets from Cometic (thanx Storm) and bumped the CR.
OK, I'm lazy. What does the CR come out to with the thinner head gaskets?

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 01-13-2005, 09:28 AM   #30
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I'm lazy too, and am waiting for someone else to bother calculating it.

And the STi bottom end is on hold for a bit. This new block is from a MY00 Legacy, and just seems so solid right now, I don't feel like spending any money on overboring and building my STi block.. My tranny is dying and I have a spare set of heads I can port, so I am going to spend any mod money in that direction for the next six months or so. Eventually, the STI block should go in there, but not for a while yet...
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Old 01-15-2005, 01:25 AM   #31
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*sigh* Do I have to do eeevvverything around here??

Using data from wac's webpage http://wac.addr.com/auto/obs/turbo/ejcalcs.html I get a stock CR of 11.07:1 for a 2000 SOHC with the 0.058cm stock gasket (slightly different from Wayne's number, I imagine due to rounding differences - I'm letting Excel calculate everything out to 8 bazillion places). With the 0.027cm Cometic gasket I get a CR of 11.49:1 - not a huge jump, but enough to be worthwhile.

While I'm busy hijacking the thread, I wonder what the gasket thickness is of the "new" (as of a couple years ago) 4-layer DOHC gaskets. That's what I have on my car - ever since the Cobb stuff was installed back in early '02.

Pat
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Old 01-15-2005, 10:15 AM   #32
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Holy sheeaayt!!!!! Would the CR bump any more if using DOHC RS heads......that have been shaved .010"????

No wonder I have to use 93 octane and still have an urge to add toluene!!!!

Jay Storm
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Old 01-16-2005, 02:12 PM   #33
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Pat,
Thanks. That was about what I figured but bailed on the calcs when I started to need rod length and opening degrees.

Jay,
Your would be higher just by using the DOHC heads on a phase II block. According to what Xephyr told me, it is around 11.5:1 just because the head volume is 2 cc smaller on the DOHC heads. Add to that the shaving (mine are shaved too) and the thin gasket, and I bet you are pushing 12...
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Old 01-16-2005, 04:49 PM   #34
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The new HG's are 0.069" uncompressed (yes, I have a new set in my parts bin).

OH, BTW, the PN is SUB11044AA610, same for both sides.

Last edited by Charlie-III; 01-16-2005 at 05:15 PM.
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Old 01-17-2005, 01:20 AM   #35
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Quote:
Originally Posted by Storm
Holy sheeaayt!!!!! Would the CR bump any more if using DOHC RS heads......that have been shaved .010"????

No wonder I have to use 93 octane and still have an urge to add toluene!!!!

Jay Storm
Bend 'em. Just don't break 'em (rules).

- Steve
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Old 01-17-2005, 03:05 AM   #36
Patrick Olsen
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Quote:
Originally Posted by Matt Monson
Pat,
Thanks. That was about what I figured but bailed on the calcs when I started to need rod length and opening degrees.
I could be wrong, but as far as I know CR is a static ratio, so you shouldn't need to know those numbers. The hard ones to find (which WaC has on his webpage) are the piston volume and the cylinder head volume. Of course, now that I know your heads are shaved the number I calculated is going to be off a bit - your CR is actually higher than what I came up with. Is the shortblock still stock, or do you have different pistons, too?

Pat
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Old 01-17-2005, 03:08 AM   #37
Patrick Olsen
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Quote:
Originally Posted by Charlie-III
The new HG's are 0.069" uncompressed (yes, I have a new set in my parts bin).
Which of course raises the question, what's the compressed thickness?

Pat
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Old 01-17-2005, 10:41 AM   #38
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Quote:
Originally Posted by zzyzx
Bend 'em. Just don't break 'em (rules).

- Steve
It's all good, Steve. This motor is in the 96L! 'Course the rulebook still has the Impreza listed as 2.5.(period) No RS designation at all.....

Jay Storm
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Old 01-17-2005, 11:38 PM   #39
CirrusWRX
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Hey Matt or Storm - I posted some questions in the 2.2L Frankenstein thread, was wondering if either of you might have a minute to stop over there and answer any you are able to?

Thanks much in advance, I'm sure you're both uber busy!
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