How to figure out compression ratio.

FX4DTUF · August 19th, 2008, 11:46 AM

ok this is the formula for finding out your compression ratio in your mustang if you dont know what it is. If your doin a build on your own and your doin boost you will want to do a lower compression such as 8.5:1 and if your doin a all motor build with nitrous personally i wouldnt go anything over 10:1 but that 1 is up to you.
If your doin a all motor build if you go anything over 12:1 you have 2 run a higher octane than 93 if you want it 2 run right. Just thought this could help some people out.

Bore X Bore X .7854 X stroke= Cylinder Volume V1

Bore X Bore X .7854 X Deck Height= Deck Clearance Volume V2

Bore X Bore X .7854 X Head Gasket Thickness= Gasket Opening Volume V3

Comustion Chamber Volume in CC's(cubic centimeters) To Convert CC's to Cubic inches, Multiply CC's by .06102 CC's X .06102= V4

V1+V2+V3+V4 = COMPRESSION RATIO
V2+V3+V4

Rep is always welcome

707Stang · August 19th, 2008, 11:48 AM

Originally Posted by torchedmach

Bore X Bore X .7854 X stroke= Cylinder Volume V1

Bore X Bore X .7854 X Deck Height= Deck Clearance Volume V2

Bore X Bore X .7854 X Head Gasket Thickness= Gasket Opening Volume V3

Comustion Chamber Volume in CC's(cubic centimeters) To Convert CC's to Cubic inches, Multiply CC's by .06102 CC's X .06102= V4

V1+V2+V3+V4 = COMPRESSION RATIO
V2+V3+V4

Rep is always welcome

that's it! it's so simple, yes of course!!

graystang01 · August 19th, 2008, 11:49 AM

FX4DTUF · August 19th, 2008, 11:54 AM

its not that hard guys lol and i thought i might be able 2 help some people out with this sry if you dont care grey stang but some people might so this is for them if they are planning on building there car in the near future

graystang01 · August 19th, 2008, 11:55 AM

dude im just playin

im kinda glad u posted that cuz if i get my new job im gonna be buildin a fox

and i like how everyone misspells my name when they're talkin to me lol

FX4DTUF · August 19th, 2008, 11:58 AM

its ight lol im studying that at this moment and when sonicblue281 posted up the compression ratio qustion i was like ill make a thread on how 2 figure out compression so i did and BAM!!! im here lol

whitemustang02 · August 19th, 2008, 12:29 PM

nice info. i left you some rep. and bookmarked this page.

this will be very useful in my high hp BBC build and keeping it running on pump gas.

FX4DTUF · August 19th, 2008, 12:31 PM

thanks bro let me know how all that goes

whitemustang02 · August 19th, 2008, 12:36 PM

it is probably about a year or so till i start it cause i need to save up the money and fully get all the details worked out.
and i need to get every detail just right to hit my goal of 800 RWHP on all motor with pump gas.

~C~ · August 19th, 2008, 12:43 PM

and to think people were bitching about not wanting to have to learn math!

FX4DTUF · August 19th, 2008, 12:47 PM

Originally Posted by whitemustang02

it is probably about a year or so till i start it cause i need to save up the money and fully get all the details worked out.
and i need to get every detail just right to hit my goal of 800 RWHP on all motor with pump gas.

nice man it can be done idk about all motor on pump gas but with a lil boost that goal can be achieved

FX4DTUF · August 19th, 2008, 12:47 PM

Originally Posted by ~C~

and to think people were bitching about not wanting to have to learn math!

??? what do you meen ???

~C~ · August 19th, 2008, 12:53 PM

IDK, i remember reading like three or four threads of people saying they didnt want to have to learn or forced to learn stuff, one of which was math.

FX4DTUF · August 19th, 2008, 01:00 PM

math is everything when it comes 2 building a motor and a vehical and im pretty shure i can get backed up by this, anything about cars is math for instance.. filling up your gas tank with 30.00 in gas and from empty you know that will get you a lil bit below 3/4's of a tank. Tire size's,rim size's,throttle body size in mm's and exhaust diamiter size and ect there is alot of math when it comes 2 vehicals that people dont relize

whitemustang02 · August 19th, 2008, 01:14 PM

Originally Posted by torchedmach

nice man it can be done idk about all motor on pump gas but with a lil boost that goal can be achieved

ya i will just have to see what #'s i get. but i think with a 632 stoker it should be doable because that is putting it a less then 1.5rwhp per cubic inch. and ruffly about 1.5 crank hp per cub.

MSO · August 19th, 2008, 01:28 PM

ur compression ratio is 9.5:1 aint it?

Mickey · August 19th, 2008, 01:31 PM

Originally Posted by whitemustang02

ya i will just have to see what #'s i get. but i think with a 632 stoker it should be doable because that is putting it a less then 1.5rwhp per cubic inch. and ruffly about 1.5 crank hp per cub.

I bet a 632 stroker is wicked expensive man

whitemustang02 · August 19th, 2008, 01:43 PM

Originally Posted by Mickey@HardcoreMustangs

I bet a 632 stroker is wicked expensive man

it is. its a just under 3 grand for all forged stroker kit
BIG BLOCK CHEVY 632 ALL FORGED STROKER KIT
but hp isn't cheep and thats why the build isn't starting for a year cause i need to save up the money.

FX4DTUF · August 20th, 2008, 02:08 AM

nice man sounds really sick

FX4DTUF · August 20th, 2008, 09:10 PM

Bump

August 19th, 2008, 11:46 AM	#1
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,382 iTrader: 0 reviews	How to figure out compression ratio. ok this is the formula for finding out your compression ratio in your mustang if you dont know what it is. If your doin a build on your own and your doin boost you will want to do a lower compression such as 8.5:1 and if your doin a all motor build with nitrous personally i wouldnt go anything over 10:1 but that 1 is up to you. If your doin a all motor build if you go anything over 12:1 you have 2 run a higher octane than 93 if you want it 2 run right. Just thought this could help some people out. Bore X Bore X .7854 X stroke= Cylinder Volume V1 Bore X Bore X .7854 X Deck Height= Deck Clearance Volume V2 Bore X Bore X .7854 X Head Gasket Thickness= Gasket Opening Volume V3 Comustion Chamber Volume in CC's(cubic centimeters) To Convert CC's to Cubic inches, Multiply CC's by .06102 CC's X .06102= V4 V1+V2+V3+V4 = COMPRESSION RATIO V2+V3+V4 Rep is always welcome __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits Last edited by FX4DTUF; August 19th, 2008 at 11:51 AM.

August 19th, 2008, 11:54 AM	#4
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,382 iTrader: 0 reviews	its not that hard guys lol and i thought i might be able 2 help some people out with this sry if you dont care grey stang but some people might so this is for them if they are planning on building there car in the near future __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

August 19th, 2008, 11:58 AM	#6
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,382 iTrader: 0 reviews	its ight lol im studying that at this moment and when sonicblue281 posted up the compression ratio qustion i was like ill make a thread on how 2 figure out compression so i did and BAM!!! im here lol __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

August 19th, 2008, 12:29 PM	#7
whitemustang02 MM's official Chevy guy 2002 Mustang V6 Join Date: Sep 2007 Location: Rochester, NY Posts: 2,024 iTrader: 0 reviews	nice info. i left you some rep. and bookmarked this page. this will be very useful in my high hp BBC build and keeping it running on pump gas. __________________ "Speak softly and carry a big stick" - Theodore Roosevelt "Any idiot can make a V8 fast, it takes a real idiot to make a fast V6". '02 Mustang N/A 4.3 stroker away for winter '72 Chevelle project car 454 coming '93 Bronco EFI 351W DD

August 19th, 2008, 12:31 PM	#8
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,382 iTrader: 0 reviews	thanks bro let me know how all that goes __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

August 19th, 2008, 12:36 PM	#9
whitemustang02 MM's official Chevy guy 2002 Mustang V6 Join Date: Sep 2007 Location: Rochester, NY Posts: 2,024 iTrader: 0 reviews	it is probably about a year or so till i start it cause i need to save up the money and fully get all the details worked out. and i need to get every detail just right to hit my goal of 800 RWHP on all motor with pump gas. __________________ "Speak softly and carry a big stick" - Theodore Roosevelt "Any idiot can make a V8 fast, it takes a real idiot to make a fast V6". '02 Mustang N/A 4.3 stroker away for winter '72 Chevelle project car 454 coming '93 Bronco EFI 351W DD

August 19th, 2008, 12:43 PM	#10
~C~ ~C~, The Other White Meat! Y2K YellowJacket GT ~TBD~ Join Date: Jun 2008 Location: West side B-More Posts: 1,697 iTrader: 2 reviews	and to think people were bitching about not wanting to have to learn math! __________________ BLOWN Bumblebeast! 370 rwhp / 381 ft lbs ~Tuned by JJ at WMS "Like the blind man says......We shall see...."

August 19th, 2008, 12:53 PM	#13
~C~ ~C~, The Other White Meat! Y2K YellowJacket GT ~TBD~ Join Date: Jun 2008 Location: West side B-More Posts: 1,697 iTrader: 2 reviews	IDK, i remember reading like three or four threads of people saying they didnt want to have to learn or forced to learn stuff, one of which was math. __________________ BLOWN Bumblebeast! 370 rwhp / 381 ft lbs ~Tuned by JJ at WMS "Like the blind man says......We shall see...."

August 19th, 2008, 01:00 PM	#14
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,382 iTrader: 0 reviews	math is everything when it comes 2 building a motor and a vehical and im pretty shure i can get backed up by this, anything about cars is math for instance.. filling up your gas tank with 30.00 in gas and from empty you know that will get you a lil bit below 3/4's of a tank. Tire size's,rim size's,throttle body size in mm's and exhaust diamiter size and ect there is alot of math when it comes 2 vehicals that people dont relize __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

August 19th, 2008, 01:28 PM	#16
MSO Banned Join Date: Jul 2006 Location: アメリカ Posts: 5,933 iTrader: 0 reviews	ur compression ratio is 9.5:1 aint it? __________________ [SIGPIC][/SIGPIC] [SIZE="5"][FONT="Arial Black"]OBEY THE FACE![/FONT][/SIZE] Edited By Moderator. Next time will be a ban.

August 20th, 2008, 02:08 AM	#19
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,382 iTrader: 0 reviews	nice man sounds really sick __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

August 20th, 2008, 09:10 PM	#20
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,382 iTrader: 0 reviews	Bump __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

Remove Advertisements Sponsored Links
Ford Mustang Forum Advertisement

LinkBacks (?) LinkBack to this Thread: http://www.moddedmustangs.com/forums/clubhouse/85156-how-figure-out-compression-ratio.html
Posted By	For	Type	Date
How to figure out compression ratio.	This thread	Refback	August 20th, 2008 03:46 AM

Threads Similar to: How to figure out compression ratio.
Thread	Thread Starter	Forum	Replies	Last Post
Compression Ratio	scxc15	V6 Mustangs	9	December 7th, 2007 08:02 PM
Compression Ratio	itschristorres8	V6 Mustangs	22	December 1st, 2007 01:46 PM
Compression Ratio	scxc15	Modular Mustangs	4	September 24th, 2007 11:01 PM
compression ratio	mustangrebuilder	Classic Mustangs	13	August 14th, 2007 10:08 PM
96 gt compression ratio	96_gt_stanger	96-98	3	March 2nd, 2007 11:52 PM

All times are GMT -4. The time now is 08:58 AM.
Contact Us - Modded Mustangs : Ford Mustang Forums - Privacy Statement - Top
Modded Mustangs is ©2005-2008, All Rights Reserved, And is Not Affiliated with Ford Motor Company. Forum is powered by vBulletin ©2000 - 2012, Jelsoft Ent. Ltd. & SEO by vBSEO 3.3.2 ©2009, Crawlability, Inc.