Dan,
Or you could get the SUs modified to flow more air as shown in the Bob Sharp
Comp manual. I do believe Rebello offers this service. Ithink a modified SU
will flow as much air as a street/strip engine will need and will be a lot
cheaper too. Solexs look great but . . . most modified street cars just need
SUs.
In Grassroots they tested a Z with Webers then ripped them out and put on
SUs and the car generally ran better w/only a slight sacrifice of top end
power.
The key to power ain't the carbs, it's in the head to let the engine breath
better as was related to me by a well respected Cosworth/foreign race engine
builder. Too bad he's so damn expensive though.
Mike
----- Original Message -----
From: Daniel Neuman <dneuman@stars.sfsu.edu>
To: <datsun-roadsters@autox.team.net>
Sent: Friday, September 22, 2000 5:02 PM
Subject: Solex's vs. SU's ..again and again and again...
> Hello All,
> Just because we have not had a good Solex vs. SU thread for a while
> I thought I would pose this question.
> Okay besides the cool induction noise of the solex I see the main
> differences between the two being..
> Solex's are fixed choke/venturi designs with one carb per cylinder.
> These are 'better' than SU's because at higher rpm's they don't
> choke off the engine. No balence tubes between cylinders bad midrange and
> off idle performance because of fixed venturi creates less than adequate
> vacuum.
> Su's are 'better' because they have a variable venturi which self-
> regulates its size so you always have a good vacuum. You get lots better
> off idle perfomance and midrange. They are 'bad' because their maximum
> venturi size does not allow enough air/fuel mixture at higher rpm's and it
> chokes of the engine. The balance tubes also help smooth out the intake
> pulses and you get a smoother running engine.
> Now heres my question:
> Has anybody ever tried fitted bigger su's to a 2000 engine?? What
> about fitting 4 SU's to the engine and having one carb per cylinder??
Would
> either of these ideas fix the high rpm flow problem?? Could you have a car
> that had good off idle performance good midrange and good top end??
>
> Just Wondering.
> Daniel 69 2000
> SF CA
>
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