Re: Diesel opacity tests for road vehicles

Posted by Bob on September 23, 2006 at 17:18:31 from (69.178.229.154):

In Reply to: Re: Diesel opacity tests for road vehicles posted by KEB on September 23, 2006 at 14:39:18:

Keith,

Simply put, your treatise does not apply, since you are discussing how a Bosch pump works, and this is a ROOSA MASTER. (STANADYNE)

Changing the maximum fuel rate on these pumps WILL NOT affect the smoke opacity at PART LOAD.

You say "controlled by opening the metering valve some number of rotational degrees after the start of the plunger stroke, spilling excess fuel back into the pump housing. The point at which the metering valve opens is determined by a combination of engine speed and throttle setting. Essentially, fuel is delivered for some percentage of the plunger stroke."

Actually, the position of the metering valve in a Roosa-Master is controlled only by how much you have your foot into the throttle, and where the engine speed is at in relation to the min-max governor, and the metering valve position DOES NOT correspond to the start, or end, for that matter, of plunger stroke.

Think about it... the Roosa metering valve is flowing only enough fuel to maintain the engine at the speed required for the 40 or 60MPH smoke test. The plungers in the rotary injection pump are at NO WHERES near full stroke, so they don't extend nearly out to the stroke limiting spring, and the spring never limits the plunger stroke, NOR WILL IT, unless you set the stroke WAY down, so fuel is limited to less than needed to maintain 40MPH on the test stand.

(In the Roosa rotary pump, the metering valve is NOT involved with the plunger stroke, such as it is in the BOSCH rotary pumps.)

And, your last statement, "hope this helps", doesn't, since we are discussing apples, and you have explained oranges! You haven't cleared up a thing, with your linked explanation of a VE BOSCH pump, since it's plunger and metering valve are one, and are axial with the head and rotor, and the Roosa metering valve is separate of the plungers, and remotely located from the plungers, which are RADIAL to the head and rotor. The BOSCH plunger/metering valve moves back and forth to inject, and rotates to control fuel delivery rate, while the ROOSA's metering valve only rotates.

Replies:

• Re: Diesel opacity tests for road vehicles KEB 15:25:21 09/24/06 (0)
• Re: Diesel opacity tests for road vehicles jdemaris 20:08:42 09/23/06 (6)
  • Re: Diesel opacity tests for road vehicles Bob 20:26:49 09/23/06 (0)
  • Re: Diesel opacity tests for road vehicles Bob 20:26:53 09/23/06 (4)
    • Re: Diesel opacity tests for road vehicles jdemaris 20:47:18 09/23/06 (3)
      • Re: Diesel opacity tests for road vehicles Bob 20:51:35 09/23/06 (2)
        • Re: Diesel opacity tests for road vehicles jdemaris 11:23:16 09/24/06 (0)
        • Re: Diesel opacity tests for road vehicles jdemaris 06:17:12 09/24/06 (0)

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