Repost....Anybody know the S4 head volume (per cylinder)??

QCRAZY · 09-27-2005, 02:59 PM

http://forums.audiworld.com/s4/msgs/2121631.phtml

Imolavirus@BuehnEngineering · 09-27-2005, 03:21 PM

think before you speak sir

Black Sunshine · 09-27-2005, 03:27 PM

***O.W. Kenobi*** · 09-27-2005, 03:31 PM

gandolf the white · 09-27-2005, 03:37 PM

-SlowSilverTIPJason- · 09-27-2005, 03:47 PM

BxS = 3.19"x3.40", CR = 9.3:1 (static). Not sure what the typical piston height or compressed head gasket thickness is on the 2.7, but using a height of .03" and a compressed gasket thickness of .03" results in about a 45cc combustion chamber volume. Of course the last two numbers are arbitrary and I pulled them out of my ass. If the motor is zero-decked, Its more like 50cc. I would hypothesize that its between 45 and 50cc's however.

-SlowSilverTIPJason- · 09-27-2005, 03:56 PM

QCRAZY · 09-27-2005, 04:48 PM

I can figure the chamber volume like that, which is ~54 cc/cylinder.

But I don't know how much of that is in the block and how much is in head. This is what I would like to know; if I know one, I know the other.

Maybe I'll ask the question different and see if someone knows that. I have a spare 2.7 block laying around but I don't have any pistons to check deck height.

-SlowSilverTIPJason- · 09-27-2005, 04:52 PM

QCRAZY · 09-27-2005, 05:25 PM

CR = Compression Ratio
CV = Cylinder Volume
ChV = Chamber Volume

CR = (CV + ChV) / ChV

Just solve for ChV. Thus,

ChV = CV/(CR - 1)

You can figure the chamber volume on any engine knowing just the CR, the bore and the stroke. The hard part is splitting up the CV into the head and the block portions.

However, I can figure the block portion if someone knows the deck height; which will get me (pretty close) to the head volume.

09-27-2005, 02:59 PM	#1
QCRAZY AudiWorld Super User Account #: 1889 Join Date: Mar 2000 Posts: 9,285	Repost....Anybody know the S4 head volume (per cylinder)?? http://forums.audiworld.com/s4/msgs/2121631.phtml __________________ Current Audi Count --- 5 Previous Audi Count --- 7 In spite of dealers; I still love Audi :-)

09-27-2005, 03:21 PM	#2
Imolavirus@BuehnEngineering Elder Member Account #: 33927 Join Date: Mar 2002 Posts: 17,986	head volume......not total cylinder volume think before you speak sir __________________ -Jacob ^^^CLICK SIG FOR BUEHN ENGINEERING WEBSITE^^^ <big><big>Website Here!!!</big></big> <big>Items For Sale</big>

09-27-2005, 03:27 PM	#3
Black Sunshine AudiWorld Senior Member Account #: 22568 Join Date: Jul 2001 Posts: 4,052	tree... __________________ "Gripping the wheel his knuckles went white with desire. The wheels of his Audi exploding on the highway like a slug from a 45. True Death, 400 horsepower of maximum performance piercing the night - this is Black Sunshine" 2002 S4 6MT AWE STG 3 - Still here, but not much longer 1995 S6 Avant Emerald/Ecru - Almost here, not much longer

09-27-2005, 03:31 PM	#4
*O.W. Kenobi* R.I.P. Account #: 20137 Join Date: May 2001 Posts: 19,413	twelve __________________ ======================================== My track videos * Brake FAQ * Kenobi lock pump * Kenobi hazard relay * Lidatek install * 43k oil analysis * 51k oil analysis * 60k oil analysis * 68k oil analysis * 76k oil analysis

09-27-2005, 03:37 PM	#5
gandolf the white Junior Member Account #: 78036 Join Date: Jul 2004 Posts: 787	minus bore x stroke would be closer but still not right - bring in to test is best __________________ "It is so choice. If you have the means, I highly recommend picking one up."

09-27-2005, 03:47 PM	#6
-SlowSilverTIPJason- Senior Member Account #: 96506 Join Date: Aug 2005 Posts: 5,510	Hard to find published data on it, you'd probably have to figure it out w/ the old CR technique. BxS = 3.19"x3.40", CR = 9.3:1 (static). Not sure what the typical piston height or compressed head gasket thickness is on the 2.7, but using a height of .03" and a compressed gasket thickness of .03" results in about a 45cc combustion chamber volume. Of course the last two numbers are arbitrary and I pulled them out of my ass. If the motor is zero-decked, Its more like 50cc. I would hypothesize that its between 45 and 50cc's however. __________________

09-27-2005, 03:56 PM	#7
-SlowSilverTIPJason- Senior Member Account #: 96506 Join Date: Aug 2005 Posts: 5,510	Sir, I don't think a 450cc combustion chamber w/ a 2:1 CR would be a good idea. :) __________________

09-27-2005, 04:48 PM	#8
QCRAZY AudiWorld Super User Account #: 1889 Join Date: Mar 2000 Posts: 9,285	I wish it were that easy..... I can figure the chamber volume like that, which is ~54 cc/cylinder. But I don't know how much of that is in the block and how much is in head. This is what I would like to know; if I know one, I know the other. Maybe I'll ask the question different and see if someone knows that. I have a spare 2.7 block laying around but I don't have any pistons to check deck height. __________________ Current Audi Count --- 5 Previous Audi Count --- 7 In spite of dealers; I still love Audi :-)

09-27-2005, 04:52 PM	#9
-SlowSilverTIPJason- Senior Member Account #: 96506 Join Date: Aug 2005 Posts: 5,510	Howd you come up with that number if you're not sure of the deck height? __________________

09-27-2005, 05:25 PM	#10
QCRAZY AudiWorld Super User Account #: 1889 Join Date: Mar 2000 Posts: 9,285	Re: Howd you come up with that number if you're not sure of the deck height? CR = Compression Ratio CV = Cylinder Volume ChV = Chamber Volume CR = (CV + ChV) / ChV Just solve for ChV. Thus, ChV = CV/(CR - 1) You can figure the chamber volume on any engine knowing just the CR, the bore and the stroke. The hard part is splitting up the CV into the head and the block portions. However, I can figure the block portion if someone knows the deck height; which will get me (pretty close) to the head volume. __________________ Current Audi Count --- 5 Previous Audi Count --- 7 In spite of dealers; I still love Audi :-)

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