Problem removing inner valve springs

-
RustyRatRod said:
You cannot figure it like that. You have to figure based on WHERE the piston is in the bore. You have more square inches at BDC, than TDC, get it? It's three dimensional, not one.
Click to expand...

Piston AREA is the same at TDC and BDC it never changes; cylinder VOLUME does change between TDC and BDC
 
RustyRatRod said:
You cannot figure it like that. You have to figure based on WHERE the piston is in the bore. You have more square inches at BDC, than TDC, get it? It's three dimensional, not one.
Click to expand...

I can so figure it like that because we are talking about injecting air at 90psi with the piston at TDC. The force will be psi x the bore area. And with the valve gear off, the force will be the same at BDC
I think we are on different pages here.
We have been talking about injecting air to help keep the valves closed for easy removal of the springs, and of course to prevent them from falling into the cylinders.... so the valve gear is on the work-bench.

brian6pac said:
90 psi on a 3.91 bore makes no difference on force on piston if it 1" away from top or 20" away from top. It's still 90 psi on a 3.91" bore. Now if you are talking reality on the piston making pressure it depends on when the intake valve closes and the stroke from that point.
Click to expand...
that's correct
as soon as a valve, either valve opens, the pressure is going,going,gone, and the force with it.

My point was that to tame 90psi at TDC with air pressure you will need a 5ft bar and massive arms, cuz if you don't catch it right away, the piston is taking off. And when it gets to the bottom, it stops really really fast! So if you are still trying to hang onto a 20" bar at that time, I'm betting there will be a hospital trip involved.
Doing a LeakDown test,I have been taken off-guard by 30psi and a 20" bar. Yeah I let go.......
I use a lawn-mower starter rope, made of several strands of smaller cloth ropes, woven together, and no air pressure.
Compressed air is akin to a compressed coilspring, even a small amount can do a massive amount of work. I once had a big air bag that was designed to lift the car to change a flat tire. It operated off the exhaust system. It lifted the whole back of the car.
 
Last edited:
JBurch said:
Piston AREA is the same at TDC and BDC it never changes; cylinder VOLUME does change between TDC and BDC
Click to expand...

I know. Volume is measured in square inches.
 
toolmanmike said:
Square inches vs cubic inches. Lol
Click to expand...

Cubic, square makes no difference. If the piston can move with both valves closed and it can then it has no "set" volume. Only if you say with the piston "here" or "here" then you have a point of reference.
 
Last edited:
JBurch said:
Triple R go back to school........AREA is square inches, VOLUME is cubic inches
Click to expand...

No you go back to damn school. None of you is getting what I am talking about. The means of measure does not matter. You cannot look at it in one dimensional thought, since the piston moves in the bore. I don't care if you measure using turds. If the piston is in a different place when you measure, you have a different amount of room. More cubic inches. More cc's more sq in. Like I said earlier, it does not matter since the OP has obviously figured out the solution to his problem. ....and he didn't use rope.
 
JBurch said:
Piston AREA is the same at TDC and BDC it never changes; cylinder VOLUME does change between TDC and BDC
Click to expand...

Yeah I get that. But YALL don't get what I am saying. We're talkin about two different things.
 
Hey, did we ever see the springs the op was going to pull the inners out of?
 
JBurch said:
The area of your head does not correspond to it's volume
Click to expand...

No need to get insulting or be an ***. I already told you we're not talking about the same thing. Sorry to have burdened yall with my stupidity.
 
You must log in or register to reply here.
-

Back
Top