Hi Tim,
It would really be nice to see some Dyno numbers for the third carb. I'm
sure you don't disagree.
One other thing I would like to add is concerning the discussion as to
whether adding the third ZS "over carbs" the engine. There was a lot of
discussion, from people much more knowledgeable than me, about whether
adding the third carb would prevent the ZS air valve/cylinder from
opening the correct amount.
>From everything I have been able the read (Haynes/Nelson), the ZS CD
(Constant Depression) carb is designed to deliver the correct air/fuel
mix regardless of how high the air valve is open. It's the point of the
design of the CD carburetor. Haynes hammers that point home again and
again. It would be nice to hear from some of the experts as to why they
are concerned about how high the air valves run on the CD ZS carbs --
two vs three carb set up.
Seems to me that if there is an advantage to the three carb set-up, it
has to be because of the straight through intake setup which makes for
less turbulence and better flow. Having said that, I'd have to agree
with you that the later TR6 sweep intake "looks" pretty good too.
I've got 4 ZS CD-2SE carbs -- looking for a reason to use them :-)
Confused about triple ZS like everyone else.....
Don Malling
Timothy Holbrook wrote:
>
> I don't think anyone knows for sure, because no one has ever done dyno
> tests back-to-back of identically prepared engines with 2 carbs vs. 3.
> That would be a really interesting test...
>
> I think we can all agree that you should spend your money on modifying
> the engine a bit first (port/polish head, increase compression, add
> performance cam, header, roller rockers, etc) before adding the third
> carb. The late-style stock intake manifold is pretty long and offer a
> relatively straight shot to the head, and I bet it flows pretty well.
> I'm sure you can get over 150hp out of the TR6 engine with stock dual
> carbs, while still remaining reliable and streetable. There are some
> guys on this list with stock dual carbs, but with other mods, who are
> running mid 15s on the 1/4 mile...
>
> Tim Holbrook
> 1971 TR6
>
> --- mocharand5@aol.com wrote:
> > I was wondering, what was the general consciences if these worked or
> > not for
> > mod and mild mods?
> > Isn't a straight shot to the cylinders better, even on stock? Doesn't
> > the
> > throttle valve compensate to properly mix the fuel air? Properly
> adjusted?
>
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