swirl dam?

98COBRA281

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Nov 24, 2007

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Jul 16, 2008

#1

• Jul 16, 2008

• #1

ive seen some company's remove the swirl damn, and them some just grind it down a little, and some dont touch it at all, what the pro's and con's of removing it, or leaving it in there, ive searched it, some say it's better to leave it, some say to take it out i know that it lowers compression a little when removed too, but should i leave it alone or what?

 

LaserSVT

Got FB banned again for saying nards

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#2

• Jul 16, 2008

• #2

98COBRA281 said:

let my have some of teh money you got, and then i can get my valve job done

Click to expand...

Spent it on another kinda job

Whats a swirl DAM? Is that the piece of metal in the combustion chamber to promote better air flow? Cause I would not remove it, mabey smoothen it but not remove. Unless you need to drop the compression for boost

 

98COBRA281

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#3

• Jul 16, 2008

• #3

LaserSVT said:

Spent it on another kinda job

Click to expand...

it supposed to reduce emissions and swirl the A/f mixture, but all the aftermarket heads like patriot remove them cause they say it blocks air flow

 

Mike97gt

it doe snot

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#4

• Jul 16, 2008

• #4

moved to tech

 

98COBRA281

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#5

• Jul 16, 2008

• #5

anyone?

 

T

TGJ

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#6

• Jul 17, 2008

• #6

98COBRA281 said:

ive seen some company's remove the swirl damn, and them some just grind it down a little, and some dont touch it at all, what the pro's and con's of removing it, or leaving it in there, ive searched it, some say it's better to leave it, some say to take it out i know that it lowers compression a little when removed too, but should i leave it alone or what?

Click to expand...

I wouldn't touch the swirl dams at all.

 

RedDaemon

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#7

• Jul 17, 2008

• #7

when i think of swirl damn i think of a turbonator

 

S

smitty77

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#8

• Jul 17, 2008

• #8

That lump of extra material in the PI combustion chamber is more of a ANTI-SWIRL dam. If you put a stock PI head on a flow bench, it has very little swirl. That lump is suppose to make the incoming A/F charge fold or tumble off the top of the piston, by directing the charge straight down. Unless you have a flow bench, and your just cleaning up the head a little, do not remove the lump, or you'll lose a lot of torque. Just round the edges a little, like the fox lake heads.

 

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geoffsgt

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Jul 17, 2008

#9

• Jul 17, 2008

• #9

Tumble > swirl for AF mixture and combustion efficiency.

Combustion efficiency is numero uno when trying to improve the overall efficiency of an engine.

 

98COBRA281

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#10

• Jul 17, 2008

• #10

all i did was round off the edges , and clean them up a bit...

stock


how they are now

 

navarro98gt

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Jul 17, 2008

#11

• Jul 17, 2008

• #11

98COBRA281 said:

all i did was round off the edges , and clean them up a bit...

Are those on PI heads or NPI heads? I know that people remove the swirl dams on PI swaped cars to lower the compression but If those are NPI heads (Your sig) what’s the bennifit?

Click to expand...

 

98COBRA281

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#12

• Jul 17, 2008

• #12

navarro98gt said:

Are those on PI heads or NPI heads? I know that people remove the swirl dams on PI swaped cars to lower the compression but If those are NPI heads (Your sig) what’s the bennifit?

Click to expand...

there NPI's, theres problay not much of a benifit, but i cleaned them up ,and just took the sharp edges off

 

G

Greenbird

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#13

• Jul 17, 2008

• #13

navarro98gt said:

98COBRA281 said:

all i did was round off the edges , and clean them up a bit...

Are those on PI heads or NPI heads? I know that people remove the swirl dams on PI swaped cars to lower the compression but If those are NPI heads (Your sig) what’s the bennifit?

Click to expand...

better heat transfer, less hot spots to cause detonation.

Click to expand...

 

geoffsgt

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Jul 19, 2008

#14

• Jul 19, 2008

• #14

But tumble promotes a better A/F mixture and turbulence during compression/ignition, allowing for a faster flame front, thus reducing knock.

 

98COBRA281

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#15

• Jul 19, 2008

• #15

geoffsgt said:

But tumble promotes a better A/F mixture and turbulence during compression/ignition, allowing for a faster flame front, thus reducing knock.

Click to expand...

true... but i dont think the little bit i removed will hurt anything.....

 

J

juecke98gt

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#16

• Jul 19, 2008

• #16

Yeah but each piston should be the same hope they all are! Looks very nice I took off a little less just no sharp edges.

 

98GTfromGA

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Jul 20, 2008

#17

• Jul 20, 2008

• #17

Leave them in! They promote tumbling of the mixture and better combustion. Ford put them there for a reason. Aftermarket head porters remove them to unshroud the intake valve and get big flow numbers. If you remove them you will have to add more timing in your tune.