Well, "deck" refers to the top of the block. So... maybe the open deck
doesn't fully support
the deck area and closed deck does. Of course, with the flat four there's
decks and neither
one is on the top. May need a Suburu expert on this one. All I know about
Suburu's is that
the spare tire can usually be found on top of the engine.
Rick Brown
-----Original Message-----
From: Bill Hamburgen 650-617-3329 FAX -3374 [mailto:billh@pa.dec.com]
Sent: Thursday, May 03, 2001 2:46 PM
To: Rick Brown
Cc: jesvilla@gte.net; Bill Hamburgen 650-617-3329 FAX -3374;
ba-autox@autox.team.net; billh@pa.dec.com
Subject: Re: "closed deck" vs. "open deck"?
Thanks Rick and Jesus,
But assuming "open chamber" = "open deck", I still don't know what
these terms mean.
The question actually came up in a discussion of current Subaru flat-4s.
The 2.5 l motors are described as "open deck", while the 2.0 l WRX gets a
different motor/block combo described as "closed deck". The implication
is that "closed deck" construction is stronger.
Further clarification welcomed!
/Bill
> The L72/L89 iron head/aluminum head big blocks had closed chamber heads.
> Example would be the 1969 L72 and L89 427's rated at 435hp with 3-2 bbl.
> carbs.
> L88's (aluminum heads) had open chamber heads. Example would be the 1969
> L88 with rated at 430hp with a single Holly 4-bbl carb.
>
> Rick Brown
> rbrown7@pacbell.net
> (408)737-1986
>
> -----Original Message-----
> From: owner-ba-autox@autox.team.net
> [mailto:owner-ba-autox@autox.team.net]On Behalf Of Jesus Villarreal
> Sent: Thursday, May 03, 2001 12:24 PM
> To: Bill Hamburgen 650-617-3329 FAX -3374
> Cc: ba-autox@autox.team.net
> Subject: Re: "closed deck" vs. "open deck"?
>
> Bill Hamburgen 650-617-3329 FAX -3374 wrote:
> >
> > I've read about "closed desk" and "open deck" motors but can't find
> > a definition of what this means. Any takers? Thanks,
> >
> > /Bill
>
> How about "open chamber/closed chamber". This applies to the chevy big
> block combuston chamber on the heads. Early(65-68) 396-427 cu. in.
> motors were closed chamber design, later hi performance 427-454's were
> open chamber design.
>
> Jesus
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