Mailing List flyrotary@lancaironline.net Message #59266
From: <Lehanover@aol.com>
Subject: Fwd: [FlyRotary] Fwd: P Port 101
Date: Tue, 27 Nov 2012 09:57:04 -0500 (EST)
To: <flyrotary@lancaironline.net>
Lucas Slide Valve fuel injection is probably the only good thing Lucas ever produced. All metal. Many tiny roller bearings. Friction free. Uses 95 PSI fuel pressure. The injectors shoot right onto the slide. However, there are no fuel leaks from the system, so this is no problem. Idle under 1,000 RPM is typical.  I should never have sold my last one. The idea is to grasp that last 4 or 5 HP from a Formula One engine.
 
For airplanes it is an answer in search of a question. Years ago we ran a factory Pport 12-A in the racer. The housings had been hopped up by Mandeville for later closing points. So the engine had very little low speed torque, but was drivable at low speed. The carb was a 48 IDF Weber. No balance tube was used. Idle was as low as you wanted it to be.
I would use two TBs with injectors after the butterflies.
Just my opinion. I could be completely wrong.
Lynn E. Hanover
 

From: jskmberki@windstream.net
Reply-to: flyrotary@lancaironline.net
To: flyrotary@lancaironline.net
Sent: 11/27/2012 7:36:00 A.M. Eastern Standard Time
Subj: [FlyRotary] Fwd: P Port 101
 


Sent from my iPhone

Begin forwarded message:

From: "Berki, Joseph UTAS" <Joseph.Berki@utas.utc.com>
Date: November 27, 2012 7:30:28 AM EST
To: "jskmberki@windstream.net" <jskmberki@windstream.net>
Subject: P Port 101

Mark,

 

I am trying to evaluate what to do with the fuel system including the slide throttle. Based on your experience in the real world, why does it bind during operation?  Is it the vacuum created by the rotors?  Is the coefficient of expansion using aluminum and Teflon causing binding?  I would think vacuum would be greatest at idle then drop off as the hole gets bigger.  The holes are teardrop shape on my slide.

 

I believe I will have some puddling but my plenum is not over the exhaust but some distance away and lower than the ports.  If the injectors are closer to the slide I see the potential for a leaking slide to ruin your day.  If the injectors were placed next to the port and downstream from the slide would there still be a potential for puddling?

 

Where should the air bleed be located?  Downstream from the slide?  Does it provide air at idle to balance the mixture?

 

Do gaskets between the spacer and the side plates of the slide seal adequately?

 

I have a heat shield that surrounds the headers and plan to duct air across the headers to keep temps down under the cowl.

 

If puddling is not an issue if a metal plenum is used that may be a solution.  I originally had this but the metal portion of the plenum got too big.

 

I am also looking at moving the injectors between the ports and the slide.  Appreciate any input.

 

Joe Berki

Limo EZ

13b P port

Subscribe (FEED) Subscribe (DIGEST) Subscribe (INDEX) Unsubscribe Mail to Listmaster