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Old 01-03-2001, 04:27 PM   #1
Lovejoy
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Join Date: Dec 1999
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Lightbulb STi WRX info from down-under

Subject: [wrx] '01 cylinders strengthened

The Japanese are really something. With the '01 or Version 7 Impreza (oops,
just realised Subaru have stopped the Version numbering on the New Age
Impreza, it's now either an NB or STi), popular Japanese mag, HyperREV have
several issues covering the new cars from head to toe including a special
edition called New SUBARU IMPREZA STi Perfect Guide ... I have a copy and
it contains everything you want to know about the STi ... gear ratios,
engine block, pistons, cams etc .. has a schematic of the IHI turbo as well
.. (damn, i need to learn Japanese !!) .. mentions something about IHI RHF
5HB and RHF55 ??

There's also pic of a fully assembled gearbox (Model TY85 & TY75) and a
graph showing RPM vs Speed between the 6 speed STi and 5 speed NB.

Fancy Subaru went to the trouble of fitting a sensor to the FUEL DOOR. Any
idea why ? The dash has a display to show if the Fuel Door is "locked" or
not. I believe the small LCD screen under the fuel gauge is a
multi-purpose screen, the pic in the mag shows "Out. Temp"

There's also a drawing of the new Brembo disc rotors that looks like DBA's
new "diamond" design. (who copied who or is that now industry standard for
improved ventilation?)

Anyway back to my subject heading. The new block now incorporates
strengthened cylinder top. Email me and I'll scan a pic off the mag for
you. Previous EJ20 engines if you look at the cylinders vertically, it's a
figure '8' with the top and bottom of the cyl. wall joined to the block
that runs the entire cylinder height. On the new engine, Subaru have
"bridged" the sides of each cylinder to the block so now you see four
'struts'. I say bridge because they only serve to hold the cylinder top and
dont run the entire length.

Enough for now. Go get yourself a copy of this mag .. it's published by
Hyper REV and the latest editions are Volume 9. The "Perfect Guide" is a
special edition sold separately.
----

Lovejoy
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Old 01-03-2001, 04:44 PM   #2
ColinL
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'01 Erion CBR 929

Post

I'd be interested to see a pic but I know exactly what they are talking about.

It seems odd though that the STi was originally closed deck, then open, and now semi-closed.
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Old 01-03-2001, 04:54 PM   #3
r5t2
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This is the magazine cover:



and the pic of the block:



[This message has been edited by r5t2 (edited January 03, 2001).]
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Old 01-03-2001, 04:57 PM   #4
ColinL
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Post

Aha.

Here's the old block:


[This message has been edited by ColinL (edited January 03, 2001).]
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Old 01-03-2001, 06:05 PM   #5
Trey
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Post



This is a EJ25 block we modified to a closed deck. We can easily do the same for any EJ20, EJ22, etc. We can do a STi-style Semi close to if anyone wants. I've always thought that would work reasonably well but didn't want to fight an uphill battle explaining why I didn't close it fully. Now that STi does it, I'm sure it'll be accepted and considered ok without any question.

So for everyone concerned about Prodrive's statement regarding high HP motors and open deck, there's your answer. Close it!

Regards,
Trey
CobbTuning.com
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Old 01-04-2001, 07:58 AM   #6
rao
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Trey,

How much for semi-closed?
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Old 01-04-2001, 10:24 AM   #7
Trey
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rao - Let me do a block like this first to see what's all involved and then I'll quote a price. It's ALOT less work to do a semi-close deck.

I have a few blocks getting prepped to close their decks and one of them is a shop-owned block going into one of our project cars. I'll just semi-close it instead of doing a full close and we'll figure a price from there.

I'll try and get pictures and prices up sometime next week. Then if we break it, we'll at least know the limits of when you should go to a full close.

Cheers,
Trey
CobbTuning.com
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Old 01-04-2001, 10:30 AM   #8
Gambit
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By the looks of it, isn't a full closed deck be better than opne decks?
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Old 01-04-2001, 10:43 AM   #9
matt7184
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Protege

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But isnt a closed deck slightly heavier?
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Old 01-04-2001, 10:50 AM   #10
rao
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98 BMW 540i LS2/T56

Post

The problem that you want to avoid is any movement of the cylinders. The way the STi block is reinforced should dramatically increase the force that would be needed to make the cylinder move, probably more than you would ever need. A fully decked block may be slightly stronger, but it will be much more expensive.

Trey, please let me know when you have an idea on price.
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