Quote:
Originally Posted by skycafe
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On races in LeMans farther are using these heavy valves ??
The issue very much often raised, important for aviation and car LeMans :
Yeah I just wanted to clarify this matter of the weight "be greater" for my solution.
She is very often raised, as the lack of the advantage of my engine.
And it is of course the untrue, but intellectual ‘box’ are ordering to think so, that it is a truth.
As a token of it I did taking off the weight on which I put the valve with the spring and spring retainer(witout retainer locks) diametef full phi 32 mm ( diameter canal 30 mm),
And I other side Piston , rod, pin,and two rings diameter 38 mm , what is a greater dimension than a valve has him considerably.
In spite of it, in the photograph done by me clearly one can see, that much he is heavier unite the valve.
If not you believe, go to scrap, find and take the piston with the connecting rod from the old lawnmower and about the same diameter valve with the spring from some car engine.. I think that you will be not having to use scales, because after taken into one hand piston, and into second of valve, you will be sure knew what was heavier.
If now will add to the moving weight of valve ( the reciprocating mass) rocker arm, mecanical regulations of clearance valve (or very heavy hydraulic valve lifter( tappet)) taped (ewentualy push rod). it sure it will turn out that the weight of the valve is twice as bigger from set piston –rod same diameter.
However, that's not all in relation to the weight.
He is reaching to valves static weight so things like valve quide in heads, and rocker arm shaft.
One should also add the weight not chosen materials of the head, about the diameter piston. and lengths of his cylinder.
For lowering static mass of the engine one should add the lack bolts for screwing the head, since altogether cylinders around wit cylinder valves it is possible easily to make one-piece steel out, and then aren't needed bolts to the head together with threaded with their nests.
Adding this static reducing the weight, we receive altogether the piston valve is three times lighter than the traditional valve.!!
And greatest loss of engine mass.Piston valves mass, at the same diameter like valves, they cause that he is arriving about 15 % of jumping volume of the engine. That is mass of the engine is also reducing about 15 %.
In net part all about termal efficiency.I am only attention, so most important in combustion chamber, are TEMPERATURE elements.
All detail about photo:
Poped Valve : weight only poped,springs,taper all 176,5 Gram.
Diameter 32 mm
diameter open gap 28,5 mm.
Piston with rods, pin, two rings , weight 160,5 Gram
Diameter 38 mm - it's 25% more poped in diameter( some weight are they grow with the square of the radius) . Gap 38 mm .
Such a difference, that for the stability, one should add the biggest weight from the set to this scale
Andrew
