piston weight

[redgoldstein]

how much is 14 grams worth in a 7000 rpm motor new piston weight a little more thanks

[mag2555]

You want a grams to hp conversion chart, or a grams to ET chart, let me know when you have such!

[pdq67]

Go over to, "Yellowbullet", and ask Mark O'Neal, the guy with the fat orange and white cat as his avatar.

Mark should/will know!

He owned Probe Pistons.

pdq67

[David Redszus]

how much is 14 grams worth in a 7000 rpm motor new piston weight a little more thanks

Inertial piston forces are a function of rpm, stroke length, rod ratio, and piston mass.

The sensitivity of each variable (calculated independently based on a change increment of 10%) is approx as follows:


rpm = 20%
stroke = 13%
mass = 10%
rod = 3%

For a given engine all the above parameters must be considered.
Piston inertial forces may or may not translate directly into torque improvement since
the primary effect is on friction.

[engineguyBill]

I think there is a formula (or table) for calculating maximum piston speed. As I recall this calculation takes stroke, piston weight and RPM into consideration and may be helpful to the OP in getting an answer to his question.

[PackardV8]

I think there is a formula (or table) for calculating maximum piston speed. As I recall this calculation takes stroke, piston weight and RPM into consideration and may be helpful to the OP in getting an answer to his question.

Piston speed is simple math of stroke x RPM.

There is no "maximum" piston speed. Back in the bad old days, 4,000 feet-per-minute was considered the "fly-to-flinders" limit, just as 10,000 RPMs was given as a physical barrier, or 150 MPH as a maximum possible 1/4-mile terminal speed. Today, engines turning 18,000 rpm with a mean piston speed of 4,800 FPM and a peak speed over 7,536 FPM, are routine, as are 300 MPH 1/4-mile speeds.

[Boss34ford]

Go to www.wallaceracing.com/Calculators There are formulas for just about any Car / Engine configuration.

[Stan Weiss]

using rpm and stroke you calculate mean / average piston speed (Velocity)

using a more complex formula you can calculate max piston speed (Velocity)

remember that the piston slows down to zero velocity ATDC and ABDC

for the same stroke and RPM mean / average piston speed (Velocity) does not change with different rod stroke ratios, but max piston speed (Velocity) does.

Stan

[MadBill]

how much is 14 grams worth in a 7000 rpm motor new piston weight a little more thanks

I would say the answer is: "For all practical purposes, zero." I would be very surprised if someone could produce credible calculations in support of anything more than a few mousepower loss.

[David Redszus]

Piston speed is not a contributing variable.

The parameter that determines piston inertial force is piston acceleration derived from rpm, stroke and rod length.

Bill, I really like the term "mousepower". Very often performance parts really only produce mousepower.

[Stan Weiss]

14 grams (0.030864717 lbs) - 12 diameter - acceleration rate of 900 RPM second.

note this for one piston as rotation mass not reciprocating.mass

Stan

ab-moi-14grams.gif

[pdq67]

Like I said earlier, go over to, "Yellowbullet", and ask Mark O'Neal, the guy with the fat orange and white cat as his avatar.

Mark should/will know!

He owned Probe Pistons.

And if you do, please ask Mark to come over here so I can ask him something. Oh, just tell him that ol' pdq67 sent you asking, he knows me...

Thanks,

pdq67

[Charliesauto]

how much is 14 grams worth in a 7000 rpm motor new piston weight a little more thanks

If your asking how much power difference, there's not a dyno on the planet that could measure that small of performance differential.

[hoffman900]

how much is 14 grams worth in a 7000 rpm motor new piston weight a little more thanks

If your asking how much power difference, there's not a dyno on the planet that could measure that small of performance differential.

Unless it was lightened in such a way that the ring lands flex, reducing ring seal. Hello power loss

[Charliesauto]

how much is 14 grams worth in a 7000 rpm motor new piston weight a little more thanks

If your asking how much power difference, there's not a dyno on the planet that could measure that small of performance differential.

Unless it was lightened in such a way that the ring lands flex, reducing ring seal. Hello power loss

Agree