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Does lowering the compression increase your displacement?

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Old Mar 12, 2004 | 10:35 AM
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Default Does lowering the compression increase your displacement?

Just like the topic says...
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Old Mar 12, 2004 | 10:47 AM
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Default Re: Does lowering the compression increase your displacement? (TurboChrgd_Civic)

NO
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Old Mar 12, 2004 | 10:49 AM
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Default Re: Does lowering the compression increase your displacement? (JimBlake)

NO
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Old Mar 12, 2004 | 10:52 AM
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Default Re: Does lowering the compression increase your displacement? (JimBlake)

what does? Does anything? Sorry if this is a stupid question...
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Old Mar 12, 2004 | 11:13 AM
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Default Re: Does lowering the compression increase your displacement? (TurboChrgd_Civic)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TurboChrgd_Civic &raquo;</TD></TR><TR><TD CLASS="quote">what does? Does anything? Sorry if this is a stupid question...</TD></TR></TABLE>

Displacement is a function of only three things: the cylinder bore, the crankshaft stroke, and the number of cylinders. It doesn't make any difference what rods, pistons, head, cams, oilpan, etc you have, only those three things change displacement.

To increase the displacement you need to either increase the bore, lengthen the stroke of the crankshaft, or add more cylinders.

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Old Mar 12, 2004 | 11:45 AM
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Default Re: Does lowering the compression increase your displacement? (tjbizzo)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tjbizzo &raquo;</TD></TR><TR><TD CLASS="quote">

Displacement is a function of only three things: the cylinder bore, the crankshaft stroke, and the number of cylinders. It doesn't make any difference what rods, pistons, head, cams, oilpan, etc you have, only those three things change displacement.

To increase the displacement you need to either increase the bore, lengthen the stroke of the crankshaft, or add more cylinders.

</TD></TR></TABLE>

So how can I calculate displacement? I've seen compression calculators, is there one for displacement?
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Old Mar 12, 2004 | 11:51 AM
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Default Re: Does lowering the compression increase your displacement? (TurboChrgd_Civic)

pi/4 * bore^2 * stroke * (number of cylinders)
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Old Mar 12, 2004 | 07:30 PM
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Default Re: Does lowering the compression increase your displacement? (TurboChrgd_Civic)

Technically, yes.
An amount that matters, no.
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Old Mar 12, 2004 | 08:00 PM
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Default Re: Does lowering the compression increase your displacement? (d357r0y)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by d357r0y &raquo;</TD></TR><TR><TD CLASS="quote">Technically, yes.
An amount that matters, no. </TD></TR></TABLE>

Please explain your claim, I don't see it.
Displacement = pi*r^2*stroke*#cylinders. No compression mentioned. My GSR has the exact same displacement as an ITR with higher compression. All compression changes is the volume of the combustion chamber.
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Old Mar 13, 2004 | 05:20 AM
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Default Re: Does lowering the compression increase your displacement? (Mohudsolo)

haha.. nevermind I'm a moron.

I was thinking *** backwards. combustion chamber area.. blah.

Ignore my staying up late insanity.
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Old Mar 13, 2004 | 11:00 AM
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Default Re: Does lowering the compression increase your displacement? (d357r0y)

It makes a lower displacment motor "act" like it has more displacement


Edit: more cylinder volume to utalize when the piston is at tdc. you can let more air and fuel into the larger volume of a low compression motor at tdc
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Old Mar 13, 2004 | 03:12 PM
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Default Re: Does lowering the compression increase your displacement? (EH2_LS_TURBO)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EH2_LS_TURBO &raquo;</TD></TR><TR><TD CLASS="quote">Edit: more cylinder volume to utalize when the piston is at tdc. you can let more air and fuel into the larger volume of a low compression motor at tdc</TD></TR></TABLE>

But with proper intake air velocity and valve timing, it would make a hell of a lot more power with higher compression.
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Old Mar 13, 2004 | 05:29 PM
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Default Re: Does lowering the compression increase your displacement? (Kendall)

but higher compression puts more stress on your bottom end because of the higher pressure developed
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Old Mar 13, 2004 | 06:10 PM
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Default Re: Does lowering the compression increase your displacement? (Hondasareus)

a lot of people don't seem to get that displacement is the amount of (air/gas) being DISPLACED in the chamber, NOT the amount of (air/gaz) IN the chamber, either way they would have called it engine volume or something like that!!
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Old Mar 13, 2004 | 09:51 PM
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Default Re: Does lowering the compression increase your displacement? (Kendall)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kendall &raquo;</TD></TR><TR><TD CLASS="quote">

But with proper intake air velocity and valve timing, it would make a hell of a lot more power with higher compression.</TD></TR></TABLE>


yea, most of my thoughts are from turbo
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