86 civic Weber 2 barrel tuning

I just put on a Webber 2 barrel on the daughters 86 civic, The other carb
and emissions stuff were giving me fits. So anyway, we ripped all the
vacuum lines off, all emissions stuff and found a cute little 4 cylinder
under there. Put the carb on, real easy install, fired up almost on the
first crank (had to get fuel to the carb first.)
Tonight we worked on the vacuum advance and noticed:
A: it has some degree of centrifugal advance
B: two vacuum ports on the dist
C: One will not hold vacuum
D: The other one allows the car to advance the timing to quick.

Now any Ideas on what set-up we should run for timing and where should we
put base timing at? The only problem is a occasional surge when turning off
the engine; not quite a diesel but close.

Other than that It starts real quick when cold, great when warm and rung
well, 10 times better that the OEM stuff. It even Idles!

Steve

 

if you're throwing al the emissions stuff away, why not go for a pair of
dcoe 40's? you can get manifold/carb kits no problem. i saw a guy
racing dcoe 40's on an integra not so long ago. he was dusting the
injected guys by quite a margin - not bad considering that performance
injection is /way/ more spendy.

that's bad. probably needs replacement.

if you're using a working factory distributor, set timing to factory.
if you want to run higher octane, you can advance it a little, but no
more than a couple of degrees.

may want to change to a colder plug.

 

if you're throwing al the emissions stuff away, why not go for a pair of

Was just looking for a fix, i knew webers made a great all around carb set
up. Primarally reason was to get it to run decent for the daughter.

Thats what i thought, but am going to try the internal cyntrifical advance
for now, just leave the others off.

Still chasing some slight Vacumme leaks, aroung the little valves on the
manifold and suck. going to remove them and put a alumunum plates over them.
I'm going to try the few degrees befor TDC for now
Ran it to work today, really scoots down the freeway.Steve

 

[snip]

This has been an interesting discussion, especially if the original engine
was carbureted. Honda used a three barrel carburetor. The auxiliary barrel
fed a small quantity of a rich mixture to the CVCC valves. This mixture was
then ignited in the precombustion chamber eliciting a flame front which then
ignited a lean mixture that was fed to the cylinders through the primary and
secondary barrels (the latter typically only invoked under heavy throttle
such as when the car is under acceleration). By using this method, Honda
was able to postpone using catalytic converters for many years since it
allowed their engines to be both fuel efficient and have low emissions (yes
I know that the '86 has a cat, this started in '84 which was about 4 or more
years after most other US cars had cats).

Does the Weber carburetor you installed have a separate barrel for the
auxiliary valves? Or, did you switch over to a head that was for the fuel
injected setup, e.g., '86 Si? If I remember correctly, the spark plug
electrode on the carbureted units was in the precombustion chamber, not the
main combustion chamber. If the Weber does not correctly feed the auxiliary
valves, then it might seem that fuel mixture ignition would not occur as
well as originally designed and the car might not pass an emissions
inspection.

Of course, the whole above discussion is mute if indeed the engine had the
fuel injected head which did not have the CVCC valves.

Eric

 

I just bought a 1982 & 83 1300 CVCC Civics and both had catalytic
converters. I kinda think that they reared their ugly head back around
1980 by statute...

I'll be interested in responses to this as well since I'm making one
good car out of the two that I have and all them thar' vacuum hoses are
causing me nightmares and insomnia (as one might tell from the posting
hour of this note).

 

Thanks for the point of clarification. Correction noted.

The trick is to not disconnect the vacuum hoses from the black boxes and to
leave as much connected to the intake manifold as possible. A factory
service manual from http://www.helminc.com is also helpful. You may even be
able to find one in a used book store.

Eric

 

Well now I understand the Aux valve setup; and the terminology CVCC.
It is a standard progressive 2 barrel carb and stock head, but the adaptor
plate and gasket was ported to a third small hole, I'm assuming for the aux
valve, so fuel and air can get there too. It's working great, so I'm not to
concerned about it being incorrect.
Just feeling out Ideas on timing.
I did discover yesterday that even though I have removed all the vacuum
stuff, I sprayed carb cleaner on the egr valve and the two others near the
front of the engine and had the rpm increase... Vacuum leaks. Tomorrow we
are removing them and bolting plates over the holes.

Steve

 

I'll eventually post a picture of the engine bay, it looks good with all the
garbage out of there. That will convince you!
Steve

 

I'm assuming that it is not a CVCC engine (3 valves per cylinder). Am I
right on that assumption?

JT

 

I'm assuming that a CVCC engine has 3 real valves and the aux valve. This is
what it has.
Stephen W. Hansen
ASE Certified Auto Technician

 

The CVCC engine head has three valves per cylinder. One of them is tiny
with several small "holes" in it.

If there is a way to put a normal carb on this setup, I am (like Perot)
all ears!

JT

 

The adaptor plate and gasket was ported to the third small hole, I'm
assuming for the aux valve, so fuel and air can get there too. It's working
great. I was wondering what that 3rd hole was for, and now I know. I guess
It porting the main passage and the small one is enough to allow the fuel
air mixture to flow into the aux valve.
I don't know all the specifics, I just ordered the carb trusted the company.
They wanted to know what set up I had and any mods.
Turned the car over to the daughter today, In the year I have owned it, it
has never ran so good. No high idle or stalling

--
Stephen W. Hansen
ASE Certified Auto Technician

 

Steve,

Do you have the website and part numbers? Oh, and what is the size of
your engine? I'm dealing with the 1300 but I suspect that you have a
1,500.

But, I'm like you. I don't give a rat's patootie about the specifics,
just that it works...

JT

 

This is indeed good news! If I have any problem with the current carb,
it would be a great option for me in a couple of years since the car is
still subject to emissions testing until its twenty five years old.