Visual difference in 302 vs 347?

Yes & why measurement should be taken TDC and then BDC...

If it has flattops(probably), then the measurement can be taken at BDC and compared with a known 302 or 347...

 

Ok, so if the top of my pistons on my 331 come up out of the block at TDC and pertrude into my heads combustion chamber, if i measure it the way that has been stated, i will come up with the same measurement as the same bottom end with flat tops ?

 

Where'r you getting a flat top out of a popup piston ? The dome is STILL there when the piston gets to the bottom of it's stroke. It does NOT "magically" disappear somewhere in between. :16suspect Open your MIND !!!! Or stop smoking that weed !!!!

 

Slow down and read, and take some of the advice you like to hand out and open your mind to what i'm saying, asking really. I dont smoke weed and dont appreaciate the put down, if you cant comprehend what i'm getting at, just stop reading.

The difference between the 2 pistons i describe is measured from the center of the wrist pin to the top of the piston. If you measure the stroke with a coat hanger, i dont see how the measurements can come out the same, the distance in the pop up will be shorter, even though it has the same stroke as a bottom end with a flat top.

 

Open YOUR mind son. Twice now, you've asked this question. Twice now I ask you this: Where does that piston dome disappear to while the piston travels from the top of it's stroke to the bottom of it's stroke ? Does the coat hanger somehow make it go away ? You are measuring the piston in ONE cylinder in ONE engine. Why on earth would you measure the distance to the bottom of a cylinder in one engine, then measure the distance to the piston in another engine and expect to somehow get the stroke measurement correct in the first engine ????????? If I'm raggin on you, I'm sorry, but you're asking a dumb question here. Slow down and OPEN your brain.

 

Lets see if i can draw ya a picture, pop up ( ---- ) Flat top ( ____ ).

Side by side, ----- _____, see the difference yet ? Do you understand why the coat hanger measurement will be different on each yet ?

 

The question i asked was what IF his motor has pop ups in it, will it or will it not throw the measuement off when using a coat hanger ?

 

The stroke of the motor is in the CRANK, when measureing with a coat hanger different piston types will give you different out comes on the travel, yes or no ?

 

No, because the distance the piston has to travel up and down will still be the same as the stroke measurement no matter how tall the piston or rod.

 

:16suspect I give up. Apparently you're incapable of comprehending the questions I asked you. Why are you insisting on measuring the distances in two engines and thinking you're going to get the stroke measurement of one engine ? HUH ????????

 

See thats what i was wondering, at the staring point of TDC to BDC, i was thinking that the coat hanger length would be shorter with a pop up. Trust me, i'm beating my head against the wall thinking about this.

 

Thats kinda my point, the top of the rod only travels as far as the crank will push or pull it, when you start adding mass to the top of the rod, i dont understand how the measurements can be the same

 

I guess what i am getting at is the Piston Pin Travel is the same, but adding mass from the wrist pin up ^ has me thinking that when measured with a coat hanger results would differ between a pop up and a flat top.

 

Here i drew a picture of it, the RED ARROW POINTS AT THE MEASUREMENT DIFFERENCE. I dont understand how you get stroke measurements with a coat hanger reading from the top of a piston, if it has a dish - flat top - or pop up the length the hanger travels down the cylinder will vary between each type of piston.

 

I failed art class BTW.