On my 510 with a stock L16 with SUs... i replaced or adjusted almost
EVERYTHING. Then one morning i woke up and took off my air filter
assembly... and it worked perfectly! So some nicer airfilters did the trick
for me,
-Chris
www.rpi.edu/~grayc
----- Original Message -----
From: "Thomas Walter" <twalter@austin.rr.com>
To: <datsun-roadsters@autox.team.net>
Sent: Sunday, November 18, 2001 11:47 PM
Subject: Re: 4500RPM ceiling
> Mike,
>
>
> One thing that does come to mind is the "replaced the
> fuel pump" then you noticed a problem! Hint, it is
> NOT the fuel pump. <grin>
>
> Since you have an early '68 2000 with that glass float
> bowl, you might want to bypass the fuel filter with
> a plastic one for the time being and see if you get
> an improvement in performance.
>
> Those original fuel filters are a neat period item,
> but always found the cork gasket would dry out after
> storage. With an electric fuel pump, mounted by the
> tank, it helps by keeping the gasket wet. If there is
> a slight air leak, the fuel filter will fill up to the
> top, getting the gasket wet. Once the gasket is
> damp, it will swell and seal.
>
> With a manual fuel pump, the filter is now a "suck
> through" style. The vacuum will cause a leaking seal
> to get sucked into the fuel line at higher rpm. Probably
> fine at idle, but once opened up under full load... it will
> not keep up with the fuel demands.
>
> On my 67 2000... it was cutting out around 3,500 rpm.
> The wire to the ignition points had failed due to fatigue.
> The insulation hid the break, but it would die out at
> high rpm. Finally ran a wire from the distributor to
> ignition coil directly. No more problem on that one.
>
> Now on that pesky 68 2000 I used to own...
> <just kidding!>
>
> Cheers,
>
> Tom Walter
> Austin, TX.
>
>
>
>
>
>
> > Subject: 4500RPM ceiling
> >
> >
> >
> >>Seems like I remember a thread awhile back when I did
> >>not own a 2000 and was not very interested, about some
> >>folks encountering an accelleration dead spot at 4500
> >>RPM's.
> >>
> >>I had my 2000 out today for a spirited test drive
> >>after some tune up, and replacing the obnoxiously loud
> >>electric fuel pump with a manual fuel pump. Seemed to
> >>be running well with the manual pump, but I was dying
> >>at about 4500 RPM's. I do not remember this before.
> >>
> >>Is there a common cause, (eg., carb richness, timing,
> >>valve float, manual fuel pump) specific to the 2000?
> >>
> >>I also had my sweet, but slower 1600 out today, and at
> >>5500 she was still winding strong. (just not the same
> >>result...)
> >>
> >>brain pickin'
> >>
> >>Mike Harper
> >>'66 1600
> >>'68 2000
> >>Charleston SC
>
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