How to figure out compression...

FX4DTUF · October 11th, 2008, 01:32 PM

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 WELCOMED

00vabchgt · October 11th, 2008, 07:48 PM

nice. good info here...

yojoe600 · October 11th, 2008, 07:53 PM

i have no idea

Got Ford · October 11th, 2008, 07:55 PM

dam nice, now did u get that out of u class books? reps to u anyways

FX4DTUF · October 11th, 2008, 10:43 PM

yeah i did get it out of my book from school but i learned it a while ago from a guy that has been building motors for 30 years he gave me the formula he is a master mind when it comes to building motors his shop's name is Action Auto Works of Stafford Va he is the best of the best for motors and transmissions he can build 1 sick transmission he built the one for our cobra and my mach 1

Arctic Fox · October 12th, 2008, 08:17 AM

I'll say it again. It's still missing one important factor, piston head volume.

94v6blkndred · October 12th, 2008, 01:00 PM

how did you get it out of your course one book..or out of the bad ass Tim Gilles book?.i mean...UTI doesnt teach a god damn thing duh remember? havent you heard that rumor

FX4DTUF · October 12th, 2008, 01:18 PM

yeah uti doesnt teach you anything lol

Kobra Killer · October 16th, 2008, 11:51 PM

This is for static CR. There is also dynamic CR which is more useful.
Here is a calculator that factors for cam timing. You can run higher compression ratios if the cam has the proper overlap to bleed off enough compression.
United Engine and Machine Co.

kotten148 · December 1st, 2008, 03:09 PM

yeah no clue

October 11th, 2008, 01:32 PM	#1
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,388 iTrader: 0 reviews	How to figure out compression... 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 WELCOMED __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

October 11th, 2008, 07:55 PM	#4
Got Ford Regular 2001 F-150 Join Date: Aug 2008 Location: Elburn, Illinois Posts: 413 iTrader: 0 reviews	dam nice, now did u get that out of u class books? reps to u anyways __________________ Silver Vehicle Club Member #2 MM Truck Crew Member #2 MODS LIST: Synthetic blinker fluid, Stg2 muffler bearings(cryo treated), Upgraded bumper bolts, computer reflashIII, 92hp shot of nitrous into the transmission(faster shifting and makes it 24/7 shifting fukkers!), Titanum locking oil drain plug(weight reduction), Spongebob harness(gotta be safe), Oil cooled air intake with a built in turbo simulator blow off valve, and a custom CANOOTER valve!

October 11th, 2008, 10:43 PM	#5
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,388 iTrader: 0 reviews	yeah i did get it out of my book from school but i learned it a while ago from a guy that has been building motors for 30 years he gave me the formula he is a master mind when it comes to building motors his shop's name is Action Auto Works of Stafford Va he is the best of the best for motors and transmissions he can build 1 sick transmission he built the one for our cobra and my mach 1 __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

October 12th, 2008, 01:00 PM	#7
94v6blkndred Hardcore Enthusiast 02 Turboed Saleen Clone faster than my v6 Join Date: Mar 2007 Location: Houston, TX Posts: 1,552 iTrader: 0 reviews	how did you get it out of your course one book..or out of the bad ass Tim Gilles book?.i mean...UTI doesnt teach a god damn thing duh remember? havent you heard that rumor __________________ 94v6.CAI,Exhaust,3:73s-needs rear end rebuild 02GT/Saleen.built motor,62mm turbo 412hp/446tq @10psi,stock TB and intake

October 12th, 2008, 01:18 PM	#8
FX4DTUF MM's Ford Truck Guy 99 ranger,2010 ranger does nice burnouts Join Date: Feb 2008 Location: Stafford, VA Posts: 1,388 iTrader: 0 reviews	yeah uti doesnt teach you anything lol __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

October 16th, 2008, 11:51 PM	#9
Kobra Killer Regular Join Date: Sep 2006 Posts: 123 iTrader: 0 reviews	This is for static CR. There is also dynamic CR which is more useful. Here is a calculator that factors for cam timing. You can run higher compression ratios if the cam has the proper overlap to bleed off enough compression. United Engine and Machine Co. __________________ Clevelands Rule https://home.comcast.net/~jimmiephil...er_project.htm

December 1st, 2008, 03:09 PM	#10
kotten148 Enthusiast Join Date: Apr 2008 Posts: 537 Blog Entries: 2 iTrader: 0 reviews	yeah no clue

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