Dave, interestingly though all the earlier
versions 1960's to about 1998 or so DONT
have the adjustable "power jets", and most feel
that they compensate very well. It is my assessment
that among the only ones that found a need for the power
jet is the prostock guys, who do MUCH more R&D than
the other classes, closer to what you do. Meaning that they may try
to pinch the perfect air fuel ratio closer than most racers as they have almost
the
only
Corporate backing, and therefore evolved the adjustable feature on the newer
Lectron.
Royce McClintick a record setter at El Mirage had great success with
the regular Lectrons, got the newer style and promptly melted parts, I believe
he will be relying on the inherent natural compensating features of the Lectron
instead of attempting to better it without the resources of a Pro-Stock
team.
Anyway for most of the racers out there, once set they are done,
most have the version like mine with no jets. Many national record holders
travel the circuit and rejoice in the natural self compensating features
that these carbs offer with respect to changes in air.
But, most of the racers I speak of dont have stuff
racing at the 24 hr of LeMan. How did your work
do out there this year?? Many of us checked in periodically
to the race, would have been great to know which cars
your handiwork was on!!!!!
By the way, did you have any stuff racing at Pikes Peak,
I saw that Mr. Millen was running a potent turboed 4 cylinder
making over 1000hp according to the commentators.
Joe :)
Dave Dahlgren wrote:
> i was told this morning on the lectron carbs, there is a power jet to dial the
> carb in for a large change in density...... But they work pretty good for
> reasonable changes in density due to the way the venturi is designed although
>as
> described there is not much of a venturi to speak of anyway. interesting but
>not
> completely self compensating either.
> dave dahlgren
>
> William T Smith wrote:
> >
> > Dave, thanks for the comeback I realize its small, its
> > just a blank that I can fill in. I look forward to
> > hearing what you find out today and see if I am on the
> > right track with my guess about density compensation.
> > wmts
> >
> > Quoting Dave Dahlgren <ddahlgren@snet.net>:
> >
> > > have you ever looked at the corrections for humidity?
> > the range of them i
> > > mean...
> > > Trust me on this it is a waste of time to get
> > concerned about. generally
> > > when
> > > someone attributes a power change due to humidity it
> > is because they see a
> > > little mist in the air and attribute the power gain
> > or loss to that. Well
> > > what
> > > they saw was the result of a change in baro or air
> > temp and the dew point
> > > changed so they could see the water in the air. get a
> > good physics book and
> > > play
> > > with the math a bit..
> > > Dave
> > >
> > > William T Smith wrote:
> > > >
> > > > If the rod was attached to a aneroid drum like in a
> > > > barometer then it could move the tapered needle in
> > or
> > > > out as dictated by pressure altitude. But how
> > would it
> > > > handle humitity changes? On my Speed Pro EFI we
> > have to
> > > > enter the humitity--it compensates for the rest.
> > > >
> > > > Quoting Dave Dahlgren <ddahlgren@snet.net>:
> > > >
> > > > > I will call them on monday i have got to know how
> > > > this works ..
> > > > > Dave
> > > > >
> > > > > Joe Amo wrote:
> > > > > >
> > > > > > Dave they
> > > > > > COMPENSATE for air density changes.
> > > > > > The reason so many use these carbs is that
> > > > > > they not only make the most power, but they
> > > > > > allow you to travel to anywhere in the world and
> > > > require
> > > > > > NO changes/adjustments, racers travel unload
> > and do
> > > > not
> > > > > > have any adjustments to make, yes sea level or
> > > > Denver,
> > > > > > same set up, 32 degrees or 120, same set up,
> > > > thousands of
> > > > > > users every weekend can attest to them.
> > > > > > Joe :)
> > > > > >
> > > > > > Dave Dahlgren wrote:
> > > > > >
> > > > > > > Wouldn't that be a CFM change and not a
> > density
> > > > change. most carbs will
> > > > > > > compensate for a CFM change quite well. I can
> > put
> > > > the same 750 Holley
> > > > > or carter
> > > > > > > on a wide variety of engines and it will work
> > > > quite well but neither
> > > > > will handle
> > > > > > > a 4000 ft change in altitude very well.
> > > > > > > Dave Dahlgren
> > > > > > >
> > > > > > > Joe Amo wrote:
> > > > > > > >
> > > > > > > > Dave, the "Lectron" is the "Fast By Gast"
> > carb
> > > > of Pauls.
> > > > > > > > Sort of Pauls, it came on two strokes a few
> > > > years ago,
> > > > > > > > he simply picked up on it again, Vesco ran
> > them
> > > > on many
> > > > > > > > of his machines. They are truly the poor
> > mans
> > > > EFI,
> > > > > > > > the set I got came off of a 1500cc plus 275
> > hp
> > > > NA
> > > > > > > > motor, when I called Paul to find out were I
> > > > should
> > > > > > > > set the metering rod length for a baseline
> > on
> > > > my 998cc
> > > > > > > > motor, he said
> > > > > > > > "didnt they work on the bike they came off
> > of",
> > > > I said
> > > > > > > > yes, and on they went, they carburate
> > perfectly,
> > > > > > > > how is that for compensation?
> > > > > > > > Joe :)
> > > > > > > >
> > > > > > > > Marge and/or Dave Thomssen wrote:
> > > > > > > >
> > > > > > > > > Joe
> > > > > > > > > Paul Gast makes a carb for the pro stock
> > > > motorcycles that does the
> > > > > same
> > > > > > > > > thing, now that you mention it. None of
> > the
> > > > scooter racers have to
> > > > > change
> > > > > > > > > jets at all.
> > > > > > > > >
> > > > > > > > > Dave the Hayseed
> > > > > > > > >
> > > > > > > > > ----- Original Message -----
> > > > > > > > > From: Joe Amo <jkamo@rapidnet.com>
> > > > > > > > > To: Dave Dahlgren <ddahlgren@snet.net>
> > > > > > > > > Cc: Marge and/or Dave Thomssen
> > > > <mdthom@radiks.net>; Land-speed
> > > > > Racers
> > > > > > > > > <land-speed@autox.team.net>
> > > > > > > > > Sent: Saturday, June 16, 2001 2:28 AM
> > > > > > > > > Subject: Re: Fw: Hilborn v. carbs
> > > > > > > > >
> > > > > > > > > Mine do Dave, you can borrow them, they
> > are
> > > > > > > > > Lectron (brand name), a flat slide carb
> > with
> > > > a tapered metering
> > > > > > > > > rod, no jets, yes they compensate
> > > > > > > > > for air density, dont need no electronics,
> > > > dont need
> > > > > > > > > no high falootin fuel system, its all
> > > > natural, self compensating,
> > > > > > > > > the dyno and the timing system dont lie,
> > ask
> > > > ANY motorcycle
> > > > > > > > > prostocker (or 90% of any at the
> > dragstrip,
> > > > or wanna be me)
> > > > > > > > > Joe :)
> > > > > > > > >
> > > > > > > > > Dave Dahlgren wrote:
> > > > > > > > >
> > > > > > > > > > Then what is with all the jets for
> > changing
> > > > things?? You mean to
> > > > > tell me
> > > > > > > > > that a
> > > > > > > > > > Holley or carter carb will need no jet
> > > > correction to run at 4000
> > > > > ft and
> > > > > > > > > 110
> > > > > > > > > > degrees instead of sea level and 60
> > > > degrees.. Sure wish i had one
> > > > > of those
> > > > > > > > > !
> > > > > > > > > > Dave
> > > > > > > > > >
> > > > > > > > > > Marge and/or Dave Thomssen wrote:
> > > > > > > > > > >
> > > > > > > > > > > And the answer is: any brand but
> > > > Stromberg!
> > > > > > > > > > >
> > > > > > > > > > > ----- Original Message -----
> > > > > > > > > > > From: Dave Dahlgren
> > <ddahlgren@snet.net>
> > > > > > > > > > > To: Marge and/or Dave Thomssen
> > > > <mdthom@radiks.net>
> > > > > > > > > > > Cc: Land-speed Racers <land-
> > > > speed@autox.team.net>
> > > > > > > > > > > Sent: Saturday, June 16, 2001 5:20 AM
> > > > > > > > > > > Subject: Re: Hilborn v. carbs
> > > > > > > > > > >
> > > > > > > > > > > And the brand carb that will make air
> > > > density changes is?
> > > > > > > > > > > Dave Dahlgren
> > > > > > > > > > >
> > > > > > > > > > > Marge and/or Dave Thomssen wrote:
> > > > > > > > > > > >
> > > > > > > > > > > > Bill
> > > > > > > > > > > >
> > > > > > > > > > > > I think the major difference
> > between a
> > > > Hilborn and a carb is
> > > > > the
> > > > > > > > > modern
> > > > > > > > > > > carb
> > > > > > > > > > > > (not a 97) automatically adjusts for
> > > > changes in air density
> > > > > (within
> > > > > > > > > > > limits)
> > > > > > > > > > > > and the Hilborn relies on you to
> > change
> > > > the pill. If you get
> > > > > the pill
> > > > > > > > > > > > wrong, the carb out-powers the
> > > > Hilborn. EFI is one step
> > > > > better, it
> > > > > > > > > > > > automatically adjusts everything.
> > CFM
> > > > aside, Hilborn trumps
> > > > > carb and
> > > > > > > > > EFI
> > > > > > > > > > > > trumps Hilborn just because of the
> > > > fineness of the
> > > > > spray(liquid fuel
> > > > > > > > > does
> > > > > > > > > > > > not burn, only vapor). Having done
> > it,
> > > > I have to say that
> > > > > tuning an
> > > > > > > > > engine
> > > > > > > > > > > > equipped with 97's was the biggest
> > > > challenge, but I like my
> > > > > Holly 750.
> > > > > > > > > > > > Dave the hayseed
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