high compression question

-Joeyy- · September 22nd, 2008, 09:49 PM

dont flame i just want to make sure about this. My mustang is high compression am i able to add a turbo or supercharger and is a blower different then a supercharger? please give me brand names of stuff that i can add if there is any. thanks

Traidmarx · September 22nd, 2008, 10:28 PM

when you say high compression...what is the actual compression ratio?? and what set up raised the compression from stock (I.E. pistons,rods,cam,etc.)

Iownastang · September 22nd, 2008, 11:27 PM

What is the C/R?

1slo5.0 · September 23rd, 2008, 03:04 AM

Originally Posted by -Joeyy-

dont flame i just want to make sure about this. My mustang is high compression am i able to add a turbo or supercharger and is a blower different then a supercharger? please give me brand names of stuff that i can add if there is any. thanks

How do you know it is high compression if you don't know anything about the engine? This is the same engine you bought for $400 or so and don't know anything about isn't it? If you put pump gas in this engine then it is not high compression. The only way to know is to figure it out mathmatically which I'm reasonably sure you don't know enough about this engine to cover all of the factors of the formula.

No, a blower or turbo will not work with a high compression engine.

-Joeyy- · September 23rd, 2008, 09:50 PM

how do i find out the compression ratio? i can do a compression test and post the results if you guys want. and yeah darrel its the same motor.

Goblin · September 23rd, 2008, 11:48 PM

A compression test will not net enough information to compose a theoretical compression ratio. You will need much more than just static cylinder pressure.

1slo5.0 · September 24th, 2008, 09:01 AM

Originally Posted by -Joeyy-

how do i find out the compression ratio? i can do a compression test and post the results if you guys want. and yeah darrel its the same motor.

A cranking compression test has nothing to do with the compression ratio. To figure the compression ratio you will need to pull a cylinder head off and you will need some accurate measuring devices. You will need to know bore, stroke, head gasket compressed thickness, head gasket bore, piston height in relationship to the deck surface, piston dome or dish volume, volume above top piston ring and combustion chamber volume.

trueblue01 · September 24th, 2008, 11:59 AM

You need to know bore, stroke, piston deck height, head gasket thickness, piston dish / dome volume and combustion chamber size to figure CR

FX4DTUF · September 24th, 2008, 12:04 PM

here is my write up on how 2 figure out compression

How to figure out compression ratio.

1slo5.0 · September 24th, 2008, 12:25 PM

Originally Posted by torchedmach

here is my write up on how 2 figure out compression

How to figure out compression ratio.

That formula is wrong.

-Joeyy- · September 24th, 2008, 07:31 PM

blah what can i actually figure out about my motor with out tearing it apart? lol i am putting it on the dyno friday and ill post the results then maybe you guys can tell me what it possibly has done to it.

FX4DTUF · September 25th, 2008, 02:07 AM

Originally Posted by Darrell

That formula is wrong.

how is that wrong

i have always used that formula for all my builds and it hasnt failed me once, i was taght that from a guy who has been building motors for over 35 yrs he is 66 now and still doin it

GoodOleBoyzRacin · September 25th, 2008, 04:08 AM

your gonna have to tear it down or find out from whoever put it together. dont be surprised if you pop the head off and the pistons are stock. unless they changed pistons the only other way would be smaller comb chamber either with diff heads or stock ones milled down. you gotta take it apart or dont worry bout it.

Arctic Fox · September 25th, 2008, 10:42 AM

Originally Posted by torchedmach

how is that wrong

It gives the same c/r for -18cc dome and +12cc dish. You dont think that makes any difference?

1slo5.0 · September 25th, 2008, 09:51 PM

Originally Posted by torchedmach

how is that wrong i have always used that formula for all my builds and it hasnt failed me once, i was taght that from a guy who has been building motors for over 35 yrs he is 66 now and still doin it

It doesn't add up for me. I've run a couple different combinations thru it and come up with lower compression then what the engines actually had.

e3sean · September 25th, 2008, 09:58 PM

Originally Posted by -Joeyy-

blah what can i actually figure out about my motor with out tearing it apart? lol i am putting it on the dyno friday and ill post the results then maybe you guys can tell me what it possibly has done to it.

we cant tell u anything internal without opening it. why dont you find the guy who built it and ask him.

fairlane_68 · September 25th, 2008, 10:22 PM

Taar it down and look at it, and do the math. It's not rocket science.

95BlackStang · September 25th, 2008, 11:55 PM

tear it down and whie your at it stroke it

FX4DTUF · September 26th, 2008, 01:13 AM

Originally Posted by Darrell

It doesn't add up for me. I've run a couple different combinations thru it and come up with lower compression then what the engines actually had.

ok well idk then thats the formula i was taught by him and in my tech school

-Joeyy- · September 26th, 2008, 09:03 AM

Originally Posted by 95BlackStang

tear it down and whie your at it stroke it

for all i know it could be stroked all ready

September 22nd, 2008, 09:49 PM	#1
-Joeyy- Banned 1989 Join Date: Sep 2008 Location: Mastic Beach Posts: 392 iTrader: 0 reviews	high compression question dont flame i just want to make sure about this. My mustang is high compression am i able to add a turbo or supercharger and is a blower different then a supercharger? please give me brand names of stuff that i can add if there is any. thanks

September 22nd, 2008, 11:27 PM	#3
Iownastang I Post Entirely Way Too Much 1987 ford mustang gt well see when shes done Join Date: May 2007 Location: mascot, tn Posts: 5,020 iTrader: 0 reviews	What is the C/R? __________________ 2004 tahoe z71 Daily 2004 BBM Gto ls1 6 speed 57,000 miles 1987 mustang hatch,347,world heads,systemax, kooks lts,nitrous, 6 point cage, team z front and rear suspension,8.8, 4.10s, 31 splines strange axles,wilwood brakes, tko600

September 23rd, 2008, 11:48 PM	#6
Goblin Hardcore Enthusiast 88mm Join Date: Apr 2007 Location: Tucson, AZ Posts: 2,111 iTrader: 0 reviews	A compression test will not net enough information to compose a theoretical compression ratio. You will need much more than just static cylinder pressure. __________________

September 24th, 2008, 11:59 AM	#8
trueblue01 Enthusiast 1989 Mustang LX 10.98@126.7 NA Join Date: Feb 2008 Location: N.E. Ohio Posts: 698 iTrader: 0 reviews	You need to know bore, stroke, piston deck height, head gasket thickness, piston dish / dome volume and combustion chamber size to figure CR __________________ Never fast enough.

September 24th, 2008, 12:04 PM	#9
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	here is my write up on how 2 figure out compression How to figure out compression ratio. __________________ 1999 xlt 2.5 ranger lowered 5/6 on 17in bullits 2010 4.0 xlt ranger lowered 4/5 on 18in dd bullits

September 22nd, 2008, 10:28 PM	#2
Traidmarx Hardcore Enthusiast 1995 Mustang GT SLOWER THAN OLD PEOPLE FUCK..:-( Join Date: Aug 2008 Location: Roanoke,VA Posts: 2,075 iTrader: 0 reviews	when you say high compression...what is the actual compression ratio?? and what set up raised the compression from stock (I.E. pistons,rods,cam,etc.)

September 23rd, 2008, 09:50 PM	#5
-Joeyy- Banned 1989 Join Date: Sep 2008 Location: Mastic Beach Posts: 392 iTrader: 0 reviews	how do i find out the compression ratio? i can do a compression test and post the results if you guys want. and yeah darrel its the same motor.

September 24th, 2008, 07:31 PM	#11
-Joeyy- Banned 1989 Join Date: Sep 2008 Location: Mastic Beach Posts: 392 iTrader: 0 reviews	blah what can i actually figure out about my motor with out tearing it apart? lol i am putting it on the dyno friday and ill post the results then maybe you guys can tell me what it possibly has done to it.

September 25th, 2008, 04:08 AM	#13
GoodOleBoyzRacin Regular 1990 Mustang GT 13.64 @ 101 MPH Join Date: Jul 2008 Location: Memphis, TN Posts: 324 iTrader: 0 reviews	your gonna have to tear it down or find out from whoever put it together. dont be surprised if you pop the head off and the pistons are stock. unless they changed pistons the only other way would be smaller comb chamber either with diff heads or stock ones milled down. you gotta take it apart or dont worry bout it. __________________ 90 Ford Mustang 5.0 T5- BROKE 1.9 60' on street tires13.64 @ 101 MPH 89 Ford Mustang coupe- http://www.youtube.com/watch?v=1nIrzcQz3_8

September 25th, 2008, 10:22 PM	#17
fairlane_68 Regular Join Date: Aug 2008 Posts: 404 Blog Entries: 5 iTrader: 0 reviews	Taar it down and look at it, and do the math. It's not rocket science.

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