powerstroke V8 to V4

[sevenmalards]

Originally Posted by jbridges1

Read Boyles law again. Even though you are not injecting fuel into the cylinder which acts as a lubricant / coolant. You are still taking in air which has been compressed by the turbo which in turn is compressed by the piston within the cylinder. Unless of course you have some magical way of suspending the piston within the cylinder!

Your definition of Boyles law is not accurate, and I can't figure out where you got it. Maybe your high school physics book?

Boyle law is this: The mathematical equation for Boyle's law is:

pV=K

where:

p denotes the pressure of the system.
V is the volume of the gas.
k is a constant value representative of the pressure and volume of the system.
So long as temperature remains constant at the same value the same amount of energy given to the system persists throughout its operation and therefore, theoretically, the value of k will remain constant. However, due to the derivation of pressure as perpendicular applied force and the probabilistic likelihood of collisions with other particles through collision theory, the application of force to a surface may not be infinitely constant for such values of k, but will have a limit when differentiating such values over a given time.

Forcing the volume V of the fixed quantity of gas to increase, keeping the gas at the initially measured temperature, the pressure p must decrease proportionally. Conversely, reducing the volume of the gas increases the pressure.

Boyle's law is commonly used to predict the result of introducing a change, in volume and pressure only, to the initial state of a fixed quantity of gas. The "before" and "after" volumes and pressures of the fixed amount of gas, where the "before" and "after" temperatures are the same (heating or cooling will be required to meet this condition), are related by the equation:

p1V1=p2V2

This mathimatical theory was invented in 1662, and was invented talking about oxygen in a cylinder AT CONSTANT TEMPERATURE
It has NOTHING to do with the internal combusion engine, or the diesel whose exaust temperature exceeds 1,000 degrees




Note THE CONSTANT TEMPERATURE IN THE MODEL??!

---

Last edited by sevenmalards : 01-08-2008 at 06:00 PM.

[AggieExcursion2010]

im on 38's and i make 21mpg highway. nice to meet ya

[mrnecsteve]

Originally Posted by sevenmalards

You beat me to it!
Yes, how do you stop the valves from moving? They are run by the camshaft, incase you don't know where that is, it's DEEP in the engine behind the water pump. It's not something you can just "turn off and on" when you want power, or good mileage. Or maybe you put the strongest valve springs on the valves to keep them closed when the camshaft wants them open....oh wait then you'll bend your pushrods......what to do, what to do....

For a homebrew setup, its pretty simple. Remove the pushrods entirely.
If he is constantly lightly loaded,there would be an MPG gain.Its feasable
and HAS been done before.
For a manufacturer or a skilled machinist, hydraulically collapsable lifters would fit the bill. For the overhead cam setup,repositioning the pivot point
on the cam follower would accomplish the task.

There are places in the world that have been using smaller diesel engines
at enormous fuel costs for a long time with engines that are half the power and size of what is in the Powerstrokes. In this country,there are many that
are getting wammied by the enormous fuel costs.

The idea Pasquale talks of has merit and has been done before.

[sevenmalards]

Originally Posted by mrnecsteve

For a homebrew setup, its pretty simple. Remove the pushrods entirely.
If he is constantly lightly loaded,there would be an MPG gain.Its feasable
and HAS been done before.
For a manufacturer or a skilled machinist, hydraulically collapsable lifters would fit the bill. For the overhead cam setup,repositioning the pivot point
on the cam follower would accomplish the task.

There are places in the world that have been using smaller diesel engines
at enormous fuel costs for a long time with engines that are half the power and size of what is in the Powerstrokes. In this country,there are many that
are getting wammied by the enormous fuel costs.

The idea Pasquale talks of has merit and has been done before.

Well if it HAS been done before then show me, because what you are describing is NOT feasable to do to a powerstroke.

If you removed the pushrods entirely then the top area of said cylinders would lose out on oiling (oil does flow through the pushrods u know?) plus the constantly compressed air (on two strokes now instead of one) would cause the engine to be off balance, and could end up causing a catastrophic failure of said piston.

Hydrauliclly collapsable lifters? Did you just make that up? There are FOUR types of lifters to my knowledge, hydraulic, flat tappet(solid), hydraulic roller, and full roller(solid roller). The hydraulic lifter has a spring loaded "valve" in it that after it is installed and the valve is adjusted properly it LOCKS in place. Sometimes when one goes bad it bleeds down over nite, then in the morning when you fire it up you get a lot of valve lash until it refills and locks again. A "hydrauliclly collapsable lifter" would be worthless. It would cause so much valve lash that no cylinder would fire.

As far as the overhead cam idea: How would you "reposition the pivot point on the cam follower?" On an overhead cam application (I have a set of 2004 porsche 997S heads ) the cam rides in the cam bearing cradle, and the cam lobe rests directly on the valve stem. There are no "pivot points" to get a valve to not open on an overhead cam head, you would have to grind the cam lobe off.

The "theory" has been attempted before by Cadillac with their 8-6-4 system (which was all done electronically) and it flopped.

Plus you say "there would be a mile per hour gain" Would destroying a 7K engine cost more or less than the amount of fuel saved? Hmmm???

He should just put a Kubota motor in it, or not drive it if he can't afford it. I'd like a Ferrari, but I don't have one

---

Last edited by sevenmalards : 01-08-2008 at 10:17 PM.

[mrnecsteve]

Originally Posted by sevenmalards

Well if it HAS been done before then show me, because what you are describing is NOT feasable to do to a powerstroke.

If you removed the pushrods entirely then the top area of said cylinders would lose out on oiling (oil does flow through the pushrods u know?) plus the constantly compressed air (on two strokes now instead of one) would cause the engine to be off balance, and could end up causing a catastrophic failure of said piston.

Hydrauliclly collapsable lifters? Did you just make that up? There are FOUR types of lifters to my knowledge, hydraulic, flat tappet(solid), hydraulic roller, and full roller(solid roller). The hydraulic lifter has a spring loaded "valve" in it that after it is installed and the valve is adjusted properly it LOCKS in place. Sometimes when one goes bad it bleeds down over nite, then in the morning when you fire it up you get a lot of valve lash until it refills and locks again. A "hydrauliclly collapsable lifter" would be worthless. It would cause so much valve lash that no cylinder would fire.

As far as the overhead cam idea: How would you "reposition the pivot point on the cam follower?" On an overhead cam application (I have a set of 2004 porsche 997S heads ) the cam rides in the cam bearing cradle, and the cam lobe rests directly on the valve stem. There are no "pivot points" to get a valve to not open on an overhead cam head, you would have to grind the cam lobe off.

The "theory" has been attempted before by Cadillac with their 8-6-4 system (which was all done electronically) and it flopped.

Plus you say "there would be a mile per hour gain" Would destroying a 7K engine cost more or less than the amount of fuel saved? Hmmm???

He should just put a Kubota motor in it, or not drive it if he can't afford it. I'd like a Ferrari, but I don't have one

It flopped because the price of fuel dropped and economy was no longer the main concern with vehicles.

I have no interest in proving or discussing anything with you.

[sevenmalards]

Originally Posted by mrnecsteve

I have no interest in proving or discussing anything with you.

Why not? I am giving a valid argument, that mechanically it's impossible.

[somebodyelse5]

I STILL wouldnt do it. If its that important...just buy the chevy or a car. Just my way of thinkin hhehehe.

[mrnecsteve]

With his particular setup and engine..my PREFERRED choice would be this:
Overdrive for Ford E4OD & 4R100 4 speed automatics Save Money! or this:
Gear Vendors Under/Overdrive, 4X4 Wheel Drive auxiliary transmissions.

[sevenmalards]

Originally Posted by mrnecsteve

With his particular setup and engine..my PREFERRED choice would be this:
Overdrive for Ford E4OD & 4R100 4 speed automatics Save Money! or this:
Gear Vendors Under/Overdrive, 4X4 Wheel Drive auxiliary transmissions.

Yeah, now that would be a nice set up! Did you see the price of that unit! OUCH!

[mrnecsteve]

Originally Posted by sevenmalards

Yeah, now that would be a nice set up! Did you see the price of that unit! OUCH!

Yeah...around 3 grand...cheeper than buying another car tho.
Shame is ,unless I didnt look deep enough ,I didnt see one for the 5r110 torqueshift yet.