Merc V6 Pistion mods

[Keaten]

Wanting to do as much to my spare merc 2.0 as possible. . Its a non finger ported engine , if i square cut the pistions for better flow, will it hurt anything by doin that being its not finger ported. Wat do the finger ports do ?

[Keaten]

I see this mod alot on pistions but they all have finger holes added or sloted just want to make shure the two doin have to go together

[faztbullet]

You can clean em up but don't drill the extra holes.....

[FORBESAUTO]

Wanting to do as much to my spare merc 2.0 as possible. . Its a non finger ported engine , if i square cut the pistions for better flow, will it hurt anything by doin that being its not finger ported. Wat do the finger ports do ?

Are you saying it's a later 2.0l fat block that has pistons like a 2.5?

[Chaz]

Can anyone say , one good thing about the piston on our right ... ?

# 1 )

Can you name three reasons why the same piston is now ruined .. ?

# 1 )

# 2 )

# 3 )



http://www.screamandfly.com/attachment.php?attachmentid=396715&d=1511732946

[BUZZIN' DOZEN]

Can anyone say , one good thing about the piston on our right ... ?# 1 ) That he's very steady with a chainsaw?Can you name three reasons why the same piston is now ruined .. ?# 1 )# 2 )# 3 )http://www.screamandfly.com/attachment.php?attachmentid=396715&d=1511732946Can anyone say , one good thing about the piston on our right ... ? # 1 ) That he's very steady with a chainsaw?

[FORBESAUTO]

You didn't do it?:D It will still yet be polished down to remove the bit marks :)

[Keaten]

Well i did it all 6 done i made a cut out transfer after the first one.. to copy the other 5 too..396798

[Krazymaan]

good looking work there guys. But you forgot to cut the big rectangle hole like this.

396837

[Chaz]

Perhaps "ruined" is too harsh of a word . Any time the thrust face is compromised it puts more of the load on the remaining tabs . As the tabs collapse the piston will rock to a greater angle in the bore and lift the rings off the bore .

If the "excessive lead in" area is in the way of flow , then either remove it entirely or come to grips with the fact that by the time the piston is approaching BDC that "the party" is over with . And whatever air is still being push/pulled will move a lot less turbulent with a blunt ( front of a wing ) arbor , than a sharp edge .

The reverse "cowcatcher" . Notice how the piston has a cut at the base to shear fluid off the cylinder walls . They do that so excessive fluid won't pile up in front of the ring and lift it off the bore . Rings have a tough enough job , no sense in asking them to be wind shied washers too .
Probably the worst effect of all is that you are packing the cold side with raw fuel and shearing on the hot side . I really don't need to explain what happens when you purposely load the piston against the hot side wall .... do I . ;)

[FORBESAUTO]

Perhaps "ruined" is too harsh of a word . Any time the thrust face is compromised it puts more of the load on the remaining tabs . As the tabs collapse the piston will rock to a greater angle in the bore and lift the rings off the bore .

If the "excessive lead in" area is in the way of flow , then either remove it entirely or come to grips with the fact that by the time the piston is approaching BDC that "the party" is over with . And whatever air is still being push/pulled will move a lot less turbulent with a blunt ( front of a wing ) arbor , than a sharp edge .

The reverse "cowcatcher" . Notice how the piston has a cut at the base to shear fluid off the cylinder walls . They do that so excessive fluid won't pile up in front of the ring and lift it off the bore . Rings have a tough enough job , no sense in asking them to be wind shied washers too .
Probably the worst effect of all is that you are packing the cold side with raw fuel and shearing on the hot side . I really don't need to explain what happens when you purposely load the piston against the hot side wall .... do I . ;)

Thanks for your opinion on this matter Chaz, as always I respect your input.:thumbsup: So you agree with my angle on bottom part of the piston as a scrapper, but not the port opening angle? I had another old buzzard that I have a lot of faith in and have learned a lot from over the years that showed me that mod . Now I gotta sit and think and analyze which one of you I wanna go with:D.

I have been running this setup ever since I've been hot rodding , and ain't never had a piston failure in this area yet and as long as I don't scatter one don't have premature ring failure. But, a very interesting take on the subject, and thanks for your input:thumbsup:

[Krazymaan]

There's always more than one way to skin a piston :cool:

[Chaz]

Thanks for your opinion on this matter Chaz, as always I respect your input.:thumbsup: So you agree with my angle on bottom part of the piston as a scrapper, but not the port opening angle?

I didn't look hard enough to see the "scraper" . You must have had me mesmerized with the Moollllleeeeeee .. err ... cowcatcher .. :eek: :D


https://media.giphy.com/media/rL8inqijmKECs/giphy.gif


But now that I had time to look , yes , I do all my pistons that way .

https://i.imgur.com/ZF65titl.jpg