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Date: Sat, 10 Apr 2010 01:42:10 -0400
Message-ID: <i2i1ab24f411004092242td067cf77h4caec75b1a0eaf27@mail.gmail.com>
Subject: Slide throttle.
From: Lynn Hanover <lehanover@gmail.com>
To: flyrotary@lancaironline.net
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When racing engines started surviving blasts up to 10,000 RPM, it became a
requirement to have an inlet runner under about 10". So even a Weber or
Delorto bolted right to the cylinder head became a bit too long.

Going to the slide throttle (Lucas) allows for a shorter tuned length and a
pure tube, with no throttle shaft and butterfly in the flow.

Not strange at all that the Lucas units have a Weber bolt pattern and gasket
shape.
At the same time Lucas came up with a high pressure mechanical injection
(about 95 PSI) that works great and tunes by lifting a plunger and turning
it to a different position. Even I could do it.

I never encountered the poor idle advertised in some locations. My factory
Pport modified by Mandeville, to the point that a child could reach into the
chamber through the intake, idled like a street engine.
We drove it to the false grid with no difficulty. The Bridge ported side
port engines must be towed around with little tractors. Neither has any
power below 2,000 RPM but the side port pops and farts, and stalls and gets
carb fires and is a general pain to deal with. Just never a factor with the
Pport.

When you are building runners 18-24 inchesl long it just seems a shame to
spend so much time on a slide throttle. The Lucas piece is well thought out.
Hardened slide with rows of bearing rollers supporting the slide. It never
hangs up no matter the load on it.

Lynn E. Hanover

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<div>When racing engines started surviving blasts up to 10,000 RPM, it beca=
me a requirement to have an inlet runner under about 10&quot;. So even a We=
ber or Delorto bolted right to the cylinder head became a bit too long. </d=
iv>

<div>=A0</div>
<div>Going to the slide throttle (Lucas) allows for a shorter tuned length =
and a pure tube, with no throttle shaft and butterfly in the flow. </div>
<div>=A0</div>
<div>Not strange at all that the Lucas units have a Weber bolt pattern and =
gasket shape. </div>
<div>At the same time Lucas came up with a high pressure mechanical injecti=
on (about 95 PSI) that works great and tunes by lifting a plunger and turni=
ng it to a different position. Even I could do it.</div>
<div>=A0</div>
<div>I never encountered the poor idle advertised in some locations. My fac=
tory Pport modified by Mandeville, to the point that a child could reach in=
to the chamber through the intake, idled like a street engine.=A0</div>
<div>We drove it to the false grid with no difficulty. The Bridge ported si=
de port engines must be towed around with little tractors. Neither has any =
power below 2,000 RPM but the side port pops and farts, and stalls and gets=
 carb fires and is a general pain to deal with. Just never a factor with th=
e Pport.=A0</div>

<div>=A0</div>
<div>When you are building runners 18-24 inchesl long it just seems a shame=
 to spend so much time on a slide throttle. The Lucas piece is well thought=
 out. Hardened slide with rows of bearing rollers supporting the slide. It =
never hangs up no matter the load on it.=A0</div>

<div>=A0</div>
<div>Lynn E. Hanover=A0=A0</div>

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