Langdon's boomer

[flapjack]

What caused it? A dropped intake valve? I mean, with 18K PSI backfiring, that would do a number on the blower.

 

[vegasnitro]

What caused it? A dropped intake valve? I mean, with 18K PSI backfiring, that would do a number on the blower.

18,000 Pounds per square inch?!?!?! There is no way that is right.

 

[flapjack]

18,000 Pounds per square inch?!?!?! There is no way that is right.

At time of the spark plug firing, it is indeed 18K PSI. I'll find the link - I believe I posted it before.

 

[mgty3whlr]

Drop a set of valve keepers, The blower pushing the valve down and the piston sucking it down, Upward stroke valve cocks, Piston hits valve bending the stem, Walla! there's your explosion.

 

[vegasnitro]

At time of the spark plug firing, it is indeed 18K PSI. I'll find the link - I believe I posted it before.

At the very deepest part of the Marianas Trench (deepest part of the ocean in the World), it averages about 15,000 PSI. It took YEARS to develop the metallurgy and materials science to create a vehicle that could go that deep.

If 18K is right, it must be for only milliseconds ... and is a wildly impressive feat nonetheless.

 

[ironpony]

At the very deepest part of the Marianas Trench (deepest part of the ocean in the World), it averages about 15,000 PSI. It took YEARS to develop the metallurgy and materials science to create a vehicle that could go that deep.

If 18K is right, it must be for only milliseconds ... and is a wildly impressive feat nonetheless.

A "hollow" space that will not collapse under that pressure is different than a piece of steel, aluminum, titanium.....under that pressure. Also the surface area of a part, say a valve stem is smaller than than 1 sq in so the pressure is less.

 

[vegasnitro]

A "hollow" space that will not collapse under that pressure is different than a piece of steel, aluminum, titanium.....under that pressure. Also the surface area of a part, say a valve stem is smaller than than 1 sq in so the pressure is less.

Time is also a major difference ... The hollow space that will not collapse must perform for hours, whereas the parts inside that cylinder will only see that pressure for a few milliseconds. Still, we are talking some serious pressure, it is very impressive and something that I had never considered before.

 

[Frank]

http://www.enginelabs.com/news/msd-keeping-eye-on-top-fuel-speeds-with-new-power-grid-system/

This article states, "over 13,000 psi peak pressure inside the cylinder." I'm guessing that number would/could increase if a dropped cylinder happens at some point in the run? Regardless, obviously some pretty high numbers especially with some of the big boomers we've been seeing lately.