Rick, can you make it to Road Atlanta in Sept with SEROC?
Mike Faggart
SEROC
NC
>From: "David A. Fox" <dafox1@hotmail.com>
>Reply-To: "David A. Fox" <dafox1@hotmail.com>
>To: chianese@sprintmail.com
>CC: datsun-roadsters@autox.team.net
>Subject: Re: Idle RPM problem
>Date: Tue, 14 Aug 2001 09:05:43 -0400
>
>Rick;
>
>I noticed your address is Orlando. Maybe sometime we can get together and
>have a little outing in our area - maybe get Sid from Jacksonville and any
>others nearby to join in?
>
><()?))>
>------------------------------
>Blue Skies & Calm Waters,
>DAFox [SRL311-04646]
>Oviedo, Florida
>dafox1@hotmail.com
>http://albums.photopoint.com/j/AlbumIndex?u=1423840&a=10659146
>
>
>
>
>----Original Message Follows----
>From: "Chianese" <chianese@sprintmail.com>
>Reply-To: "Chianese" <chianese@sprintmail.com>
>To: <datsun-roadsters@autox.team.net>
>Subject: Idle RPM problem
>Date: Mon, 13 Aug 2001 22:47:21 -0400
>
>Kim and Robert,
>
>The fast idle speed that happens when you slow down from normal highway
>driving is often caused by throttle shafts that stick to the carb body.
>Closing the throttle causes a large pressure difference across the oval
>shaped throttle plate. You can have 35 pounds of force pushing the
>throttle
>shaft into the carb body. After a few years of wear and tear, the shaft
>and
>the holes in the throttle body are no longer smooth and friction will build
>up to the point where the springs can no longer close the throttle.
>
>Reving the engine releases the pressure difference across the throttle
>plate
>and it has a chance to close before the pressure differential is restored.
>
>The Japanese were smart enough to put bronze bushing into the aluminum carb
>body so that the shaft would not wear an oval hole into the aluminum. (I
>have seen british cars that had such sloppy fits, that the air would bypass
>the throttle plate. It can get bad enough that the throttle plate can
>start
>rubbing against the bore of the carb.) Check to see if there is a lot of
>play between the throttle shafts and the carburettor. (Especially
>horizontally) The bushings can be replaced if you find someone that can
>line bore them after they are installed.
>
>One of the suppliers has gone to the trouble of putting needle bearings in
>the carb body to support the throttle shaft instead of bronze bushings.
>That is absolutely the best solution, if you can afford it.
>
>If lubricating the cables and pivots does not solve your problem, try
>squirting some lubricant onto the throttle shaft from the outside where it
>passes through the body. Don't do this on a hot or running engine or you
>could end up with singed eybrows. This will only work for some period of
>time that can vary from months to days. Eventually you need to fix the
>bushing or get stronger springs. (I had this same problem on my roadster
>and on a 1978 305 Chevy V8. The Chevy dealer sold me new throttle springs
>that were about 50% stronger than the originals. That's a typical GM
>solution to any problem.)
>
>Rick Chianese
>Orlando, FL
>SRL311-14035
>
>
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