Hi Frank ,
I'm worried about all the trouble your having setting up the 1.75 SU . I am
planning to use a 1.75 on my car because I live at 8,000 ft and will
routinely drive at altitudes between 5,000 and 10,000 ft . You did not
mention ever checking the spring rate that controls the variable venturi /
carb throat / piston / (or whatever its called ).
I've read that different spring rates are available . I believe that the
piston is supposed to be fully opened at full throttle / full load . If it
opens too soon , or not all of the way, you will have problems . Also you do
not mention anything about your fuel pump . I think that the fuel pressure
requirements are different between a Weber and an SU . Let us know how
things work out .
P.S. If you end up giving up on the SU let me know . I would be willing to
buy it from you and give it a try .
Good Luck ,
Mark Hanna
AN5L/13731
> -----Original Message-----
> From: Frank Clarici [SMTP:spritenut@Exit109.com]
> Sent: Tuesday, March 30, 1999 6:34 PM
> To: spridgets@autox.team.net
> Subject: 1.75 SU vs Weber DCOE
>
> I am at my wits end!
> I now have 2) 1.75 SU set ups for the 1275. I also have a small fortune
> invested in various needles from Burlen Fuel systems (nice guys BTW) And
> lots of advise from APT including filing a flat on one of the needles.
> If any of you guys are running a 1 3/4 SU HIF6, What is the secret?
> I hear that they are soooo much better than a side draft Weber (at least
> the Mini guys think so) Either they are complete idiots or they don't
> know what a decent carburettor is.
> I can not fit a pair of 1 1/4 SUs on my A40, the steering box is in the
> way.
> The 1 3/4 SU fits nice and it runs but it runs like a dog, a dead dog!
> After about a year of down draft Webers, Nikki down drafts, and 2
> completely different 1 3/4 SU set ups not to mention 3 or 4 different 1
> 3/4 SUs and all types of jets and needles, I put the side draft Weber on
> it and it runs like it should.
> So now my Bugeye is with out a carb!!!!! I put the 1 3/4 SU on it and it
> is now a dead dog!
> What is the secret to making it run. Oh, the idle is great but who idles
> around town?
> I am convinced the Mini guys don't know anything about these carbs. My
> first one came from a Mini "expert" I put it on my son's Mini and he
> pulled it off before the day was out, he prefered dual 1 1/4s over it
> and I don't blame him.
> Any needle advise from the Mini guys was usless. Burlen Fuel at least
> knew what I needed not that it makes much of a difference. I have gone
> to a super rich needle only to eat gas and choke out the neighborhood.
> It still didn't run under a load.
>
> Frank, pulling his hair out on another LBC
>
> --
> Frank Clarici
> Toms River, NJ
> Bugeye Sprite
> 67 Sprite
> 59 A40
> http://www.exit109.com/~spritenut/
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