Solid Lifter Schematic

[Joe C.]

My best Google searches produce no results for me. I'd like to see an internal schematic or rendering of piddle valve vs. edge orifice lifters.

Thanks in advance.

[Clem Z.]

Re: Solid Lifter Schematic

My best Google searches produce no results for me. I'd like to see an internal schematic or rendering of piddle valve vs. edge orifice lifters.

Thanks in advance.

edge orifice lifters have nothing inside and the oil is metered by the where the hole is located in the lifter barrel. the piddle valve lifters have a internal metering groove with a floating flat disk on it that meters the oil. the oil enters the lifter thru a hole in the recessed area of the lifter so they are under full pressure all the time where the edge orifice lifter only sees oil full pressure at certain times during its travel. corrected the second sentence should have piddle instead of edge orifice

[John H.]

Re: Solid Lifter Schematic

Joe -

Here's a piddle-valve solid lifter - you can see the flat metering disc between the bottom of the pushrod seat and the body of the lifter.

[Wayne M.]

Re: Solid Lifter Schematic

Joe -

Here's a piddle-valve solid lifter - you can see the flat metering disc between the bottom of the pushrod seat and the body of the lifter.

.... and here's the edge-orifice type. Under Gr 0.459, John's pic of the piddle valve unit is part # 5232695, and the one shown below (from the '65 Corvette Shop Manual Supplement) is # 5231585.

[Joe C.]

Re: Solid Lifter Schematic

Thank you for the photos. Clem's explanation is very helpful, but I'd like to examine it further.

First, it would be interesting to learn the etymology of the term "piddle valve", considering:

pid⋅dle

  /ˈpɪdl/ Show Spelled Pronunciation [pid-l] Show IPA verb, -dled, -dling.Use piddle in a Sentence

See web results for piddle

See images of piddle

–verb (used without object) 1. to spend time in a wasteful, trifling, or ineffective way; dawdle (often fol. by around): He wasted the day piddling around. 2. Informal. (esp. of children and pets) to urinate.
–verb (used with object) 3. to waste (time, money, etc.); fail to utilize (usually fol. by away).

Is excess oil flow being "wasted" with the piddle valve design?

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

The edge orifice is straightforward in that the oil passages are not internally checked. The timing of the pulses of oil is determined by alignment if the oil tap in the lifter with the two oil feed holes from the lifter oil gallery to the lifter bores. It is conceivable that if this type of lifter fails to rotate properly, that it will prevent oil flow if the lifter tap is not aligned with either of the two approximately 1/4" feed holes in the engine block's lifter bores. It also appears that during normal operation, this type of lifter does not deliver a pulse of oil to the pushrod on every cycle. This pulsing is determined by both the radian and longitudinal orientation of the lifter in the bore, causing alignment of the lifters' oil tap with either of the 1/4" oiling holes within each lifter bore.

The piddle valve type has the reservoir constantly pressurized because the oil tap is within its relieved area, which is always in alignment with the oil feed holes in the block. It is more fail-safe in this regard, since pressurization is not dependent on lifter rotation. The metering disc has its hole offset from the pushrod seat hole ("piddle" valve?), so it appears that it will "check" oil flow when it is seated against the underside of the pushrod seat. What causes the metering disc to unseat from the pushrod seat underside surface, and allow oil flow? Is there a relief spring which cannot be seen in the diagram?

[Clem Z.]

Re: Solid Lifter Schematic

Thank you for the photos. Clem's explanation is very helpful, but I'd like to examine it further.

First, it would be interesting to learn the etymology of the term "piddle valve", considering:

pid⋅dle

  /ˈpɪdl/ Show Spelled Pronunciation [pid-l] Show IPA verb, -dled, -dling.Use piddle in a Sentence

See web results for piddle

See images of piddle

–verb (used without object) 1. to spend time in a wasteful, trifling, or ineffective way; dawdle (often fol. by around): He wasted the day piddling around. 2. Informal. (esp. of children and pets) to urinate.
–verb (used with object) 3. to waste (time, money, etc.); fail to utilize (usually fol. by away).

Is excess oil flow being "wasted" with the piddle valve design?

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

The edge orifice is straightforward in that the oil passages are not internally checked. The timing of the pulses of oil is determined by alignment if the oil tap in the lifter with the two oil feed holes from the lifter oil gallery to the lifter bores. It is conceivable that if this type of lifter fails to rotate properly, that it will prevent oil flow if the lifter tap is not aligned with either of the two approximately 1/4" feed holes in the engine block's lifter bores. It also appears that during normal operation, this type of lifter does not deliver a pulse of oil to the pushrod on every cycle. This pulsing is determined by both the radian and longitudinal orientation of the lifter in the bore, causing alignment of the lifters' oil tap with either of the 1/4" oiling holes within each lifter bore.

The piddle valve type has the reservoir constantly pressurized because the oil tap is within its relieved area, which is always in alignment with the oil feed holes in the block. It is more fail-safe in this regard, since pressurization is not dependent on lifter rotation. The metering disc has its hole offset from the pushrod seat hole ("piddle" valve?), so it appears that it will "check" oil flow when it is seated against the underside of the pushrod seat. What causes the metering disc to unseat from the pushrod seat underside surface, and allow oil flow? Is there a relief spring which cannot be seen in the diagram?

the holes in the lifer bores in the block are close to 7/16" diameter. the disk is unseated when the oil flow thru the rocker arm is shut off causing the pressure on both side of the dist to equalize. the oil flow is shut off thru the rocker as it goes thru the arc and the oil hole in the rocker and the oil hole in the push rod are not in line.

[Clem Z.]

johnson lifters

8/1/2004

Topline Automotive Buys, Reopens Hylift Facility, Engine Builder, August 2004




After being shuttered for several years, the Hylift-Johnson Lifters manufacturing plant in Muskegon, MI, has been purchased by Topline Automotive Engineering and reopened.




A full-line of flat mechanical tappets, lash adjusters and encapsulated hydraulic roller lifters are again being produced by the original Hylift machines and team. The previous Hylift OE lines that were in Zeeland, MI, have now been relocated to the Muskegon plant.
"The same people who made 'The Beautiful Lifter' are back manufacturing with precision and a dedication to quality that has not been seen in the lifter business for quite a few years," said Topline's Edward Plebanek. "We feel the real value is not in the equipment or the plant but with the employees who have over 600 years of Hylift experience."
The Muskegon plant is currently in its third month of production. Topline Hylift-Johnson will continue its historical way of going to market by traditional means of distribution through a select group of customers.

[Tom D.]

Re: Solid Lifter Schematic

http://www.toplineauto.com/about-us.asp