dneuman@stars.sfsu.edu wrote:
>
> >Magic1910@aol.com wrote:
> >
> >
> >Exactly!!. I you look at the performance curves of the SU vs Solex cars,
> >below 4000 rpm the SU has more hp and torque, above 4000 the Solex w B cam
> >does.
> >It all depends on what range you operate your U20. Myself I prefer lower end
> >torque and rarely go above 4k so I'll keep my SUs.
> >
> Well this is also a function of the cam. What if you got a
> 'better' cam grind that made power in a broader powerband? I have been
> wondering this why is the solex b cam the only one you ever hear about???
>
> Daniel 69 2000
This is one of those discussions that has no end. It is true that SU's
(IN GOOD SHAPE) are very good carbs. However there are some fundamental
limitations and Solexes are better in many ways.
Solexes are far more tuneable than SU's and they (if in good shape)
stay tuned much better than SU's. One you select the jets you have
set the mixture and it stays the same for the most part. SU's are
not quite that forgetable.
You can also modify performance at different RPM's easier with Solexes
w/o affecting other performance much. (you can modify the Idle
jetting w/o changing main jetting) With SU's the two are
joined at the hip, you have to start experimenting with needles to
get serious about it. Any serious effort in this area is MUCH more
intensive that rejetting solexes.
Our SU designs suffer from poor shaft design (and metallurgy).
Scott a Z-therapy may have the best solution for this (real shaft
bearings and seals). Solexes don't have a big problem
with this.
SU's are great carbs, but Solexes are excellent as well.
Jim Tyler
Topless Datsun
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