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Subject:Re: DJ Compression Ratio
From:Michael Sullivan
Date:Tue, 24 Jun 2008 17:35:46 -0500

Chris...looks like you got your filters workin' :-)

On Tue, Jun 24, 2008 at 4:52 PM, Scott Daniel - Shazam <
scottdaniel@turbovans.com> wrote:

> Hi Cris - lol.
> I  hope you are half sincere about the Soobie comment !
> scott
>
>
> Chris S wrote:
>
>> Sheesh, Scott that was not picky at all!
>>
>> I just love how you voluntarily sprinkle us with your Subaru enthusiasm.
>>
>> On Tue, Jun 24, 2008 at 2:26 PM, Scott Daniel - Shazam
>>  <scottdaniel@turbovans.com <mailto:scottdaniel@turbovans.com>> wrote:
>>
>>    for the sake of technical pickiness,
>>    let's say it would be more kosher to say there's a big difference
>>    btween a CR of 10 and 9.7 to 1 .................
>>    IF.........there is proper and even semi-radical valve timing and
>>    cam profile, quite advance ignitioin timing, and very inhanced
>>    intake and exhaust systems, and all that .........then, yes, 9.7
>>    vs 10 is a significant difference.
>>
>>    giving only two changes that I know of ........the CR and the fuel
>>    and timing mapping in the ECU..........*nothing* else is much
>>    differnt......same lame looking intake runners ( look at some
>>    subaru engines, particularily the DOHC 2.5 for some nice obviously
>>    flow-enhanced intake runners ) ..........*not to mentioin* hokey
>>    two valves per cylinders and PUSH RODS !! ( what are 'push rods'
>>    ???? ..........and 'rocker arms' ???...........are those ancinet
>>    things associated with 'points'........whatever those are ??
>>
>>    Think you get my point - given how ancient and crude the
>>    waterboxer engine is........the dif between 9.7 and 10 to one CR
>>    is nothing basically.
>>
>>    More :   ( I do get carried away - following is just 'more' about
>>    'how to get there' engine performance and fuel economy-wise )
>>
>>    and besides...........
>>    without KNOCK SENSOR ignition ........how can the engine even be
>>    really 'smart' about how much power it can produce ?  It can't.
>>    I don't think many people recognize that knock sensor ignition is
>>    a feedback system - the ECU constantly pushes the timing as much
>>    as it can.......and gets feedback from the knock sensor when
>>    timing is 'too much' - conseuqnetly it's opptimized constantly
>>    according the whatever ignition curve mapping the engineers put in
>>    the ECU>
>>    with old and fashioned  distributor that either ( 1.9 wbxr )
>>    depends on centrifugal and vaccum mechanical devices to make the
>>    timing 'about right, roughly' most of the time........or as in the
>>    2.1 ignitioin timing is determined within the ECU -but STILL
>>    ..........it's guessing at what is about the right timing for all
>>    rpm's, loads etc.  - without a feedback knock sensor
>>    ..........Ignition Timing Curve is just like A CARBURETOR - it's a
>>    crude  approximation that gets something within the broad ball
>>    park of what would really be optimum.
>>
>>    If I was going to 'invest' time in trying to get more out of a
>>    waterleaker vanagon engine  ( and you WILL NEVER GET PAST Push
>>    Rods and Two Valves per cylinder - though there's been at least
>>    one air-cooled drag racing VW Bug engine with subaur 4 vavle OHC
>>    heads put on it ).........
>>    If I just 'had to' try to get the most out of a waterboxer engine,
>>    in the electronics dept. I'd try an aftermakret tunable engine
>>    managment system.
>>    Links is one. Expensive.
>>    But then you hook up your lap top to your ECU and you prgroam in
>>    the timing and fuel mapping that you want, even boost if you have
>>    a turbo.....all of that.
>>
>>    and BESDIES Again - you will never get past the JOKE 'head
>>    gaskets' that a waterboxer enigine has, and will ALWAYS have.
>>    it is PURELY AN ADAPTED AIR-COOLED VW ENGINE.
>>
>>    I love what Pual G. said when he was here- we were ponidering our
>>    amazment of how difficulut a water pump is to do on a waterboxer
>>    with the engien in the van...........like they sure coulda made
>>    that easiier if they really wanted to ! - and it's the main part
>>    that wears the fastest too- 70K miles is all you can really expect
>>    for sure out of a w. pump on a 2.1 wbxr engine - he
>>    said.................
>>    "VW gave the engineers 30 days to come up with a watercooled
>>    vanagon engine. "   !!
>>
>>    THAT FITS - oh does it ever.
>>    Subaru Engineers..........and all manufacturers check out what the
>>    other manufactureres do ..............in 1990 when they were
>>    coming out with the Subaru EJ22 engines - which is just a
>>    BEATUTIUFAL piece of automtoive and motor engineering
>>    ............I'm sure after work at the Saki Bars they just laughed
>>    themselves SILLY over how much the waterboxer engine is a patch
>>    job and 'emergency upgrade' to VW's traditionial pushrod Bug
>>    engine layout.
>>
>>    I 'do' waterboxer engiens all the time - cause I get them
>>    easily..........cause they're around - I don't hate them........
>>    but if you really wanting something enhanced and very worthwhile
>>    that goes better, and gets better fuel economy and is more
>>    durable......
>>    and has better throttle repsonse, and HOLDS A SETUP WAY, WAY
>>    BETTER Than a waterboxer Vangon engine ............
>>    there are much better more modern engines that will advance you
>>    light years , and it can be inexpensive too if you do the work
>>    yourself...........
>>    I'm, partial to subaru's.........but there are other modern good
>>    engines too............
>>
>>    you can only get so far upgrading something in incremental steps.
>>    At some point to really advance you need a whole new 'clean sheet
>>    of paper.'
>>    No matter what you do to a horse-drawn wagon - put an engine in
>>    it,, put a windshiled on it, put disc brakes on it .........
>>    it can never be a car.  you just can't 'get there' without
>>    stepping into a whole other paradigm in design anc concept.
>>
>>    I have core and rebuild-able subaru engines for sale btw.......not
>>    trying to push that.  One of these days i'll have an extensive
>>    inventory reduction sale.
>>
>>    What I would do - assuming one has the room for a spare vanagon
>>    ......and assuming one doesn't have 10 grand to just drop on a
>>    Soobie conversioni................get some totally beater
>>    watercooled vanagon cheap , .......and get a Legacy Subaru car
>>    cheap - they go for 300 dollars sometimes - and build up a soobie
>>    conversioin overtime while keeping your good vanagon for trips and
>>    so forth.   That way you are never without a good running Vanagon.
>>    And when it's all dialed in, swap it over to your good vanagon.
>>    Only meant to say - didn't mean to make this about subaru-vanagons
>>    - ( use some other modern engine , that's fine too )  if you
>>    really want enhacned performance and fuel economy and real delight
>>    in an engine ........you can't get there really well with the old
>>    hardware.    it costs more........yes.........that is a problem
>>    all right - but the reward in the end.......wow !
>>    Scott
>>    www.turbovans.com <http://www.turbovans.com>
>>
>>
>>    Chris S wrote:
>>
>>>    So how does it run compared to the stock MV WBX?
>>>
>>>    I'm asking because I have a complete DJ WBX on the way, with ECU, to
>>> replace
>>>    the 1.9L in my '84 Westy.
>>>
>>>    Chris.
>>>
>>>    On Mon, Jun 23, 2008 at 10:13 PM, Kim Springer <kimspringer@rcn.com>
>>> <mailto:kimspringer@rcn.com> wrote:
>>>
>>>
>>>    Everyone keeps stating that the DJ Engine CR is 10:1, 10.5:1, etc.
>>>>
>>>>    I carefully measured my DJ engine and it was 9.65:1. MV is 8.65:1.
>>>>
>>>>    If you want to round up to 10:1, so be it, but, when it comes to
>>>>    compression
>>>>    ratios, 9.7 is a long way from 10.
>>>>
>>>>    Kim
>>>>
>>>>
>>>>
>>>
>>
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>>

--
Michael in San Antonio
91GL AT 'Gringo'

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