Q: I have a DX, can I put the better breathing
Si head on my DX block (the Si and the DX share the same EW block).
A: This answer comes from the Mk1CRX discussion
group on Yahoo Groups: I would definitely go for the Si head. I
have done it and I was amazed. I shaved my Si head .040 to recover
lost compression, but it's not necessary, you'll just have low compression.
If you do shave the head, a cam gear is most beneficial, because
shaving the head automatically retards cam timing and the gear will
get it back to stock or preferably a bit advanced, good for mid
range power. I went the dual sidedraft route, very simple manifold
and no worries. Weber Carbs: they are unmatched in the world of
carburetion, but very,, expensive, and a PITA to tune and sync the
first time, along with being very sensitive to dramatic weather
changes. Weber makes sidedrafts, in several varieties. The most
common [and arguably the best carb of any configuration ever made]
is the DCOE. They're a twin carburetor design, meaning that there
are two distinct throats that act independently of one another,
but share the same body. They can be found with 40, 45 and 52mm
throats [I think there are more, but those are the most popular,
esp. the DCOE 40]. The easiest way to get more power from an engine
is to allow it more air with the proper amount of fuel. For my engine,
I chose twin DCOE 40 Webers [that's four (count 'em, 4) air horns],
with a DC sports header. Mikuni's are nice, easily tuned, but Webers
blow them out of the water if they're jetted even close. You can
find more models and prices of Weber carbs and carb kits at: www.carbs.net
Q: Can I put a single carburetor on my Si
head?
A: Rip and Tear Auto from the CRX Resource answers:
The carb is a Weber 32/36 DGAV. This is the carb that is used in
the single Weber conversion kit for carborated 1st gens. We had
to change every jet in the thing. Right now it's got:
150 primary main
155 secondary main
75 primary idle
60 secondary idle
55 double shot accelerator pump jet
160 primary and secondary air correctors
It still needs a bigger secondary idle jet (don't have one yet)
and I am still playing with the air correctors. The injector holes
are just taped and plugged with standard brass plugs. I originally
used the DX cam in the Si head so I could run my stock fuel pump,
but have since switched over to a corroborated Accord pump. The
Accord pump is electric, and has a built in regulator. Vacuum lines?
I have vacuum lines. Well, one anyway, running from the back of
the carb to my vacuum advance on my distributor. No it is not smog
legal, but hey you can't have every thing. As far as the design
of the adapter plate, I never drew up anything nice because I didn't
need to since I was making the plate my self.
Q: Where can I get stiffer than stock motor
mounts?
A: Mugen used to make a set, but they are currently
unavailable. But you can cheaply make your OEM mounts stiffer than
stock by filling the hollow spaces in the rubber mounts with polyurethane
(3-M polyurethane adhesive works well). Clean all of the surfaces
inside the OEM motor mounts carefully, apply the windshield adhesive,
and let it cure for about 48 hours before reinstalling.
Q: Can I put the D16A DOHC head on my EW
block?
A: This answer comes from John Killen- A D16A cylinder
head bolt holes are in the exact same location as the Civic head,
and the oil port to the head is in the correct location also, so
it can be bolted to the Civic block, however, the oil drains don't
quite match although they're close enough to probably work. You'll
have to use the D16A head gasket because the sealing ring is smaller
on the Civic. You can use the Civic distributor (because it's got
the sensors inside it required for the ECU to operate the fuel injection)
if you're using the Civic ECU. (You'll have to plug the hole at
the end of the exhaust cam where the Integra's sensor housing would
normally be mounted.) I have no idea if there is a cam belt and
tensioner that'll fit that configuration though. If you were able
to get it to work, you'd probably be the first to actually do it.
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