what is the compression ratio on a...

wop · 06-14-2001, 12:36 PM

...stock MY99 EJ25?

thanks,

-wop

25psi · 06-14-2001, 12:57 PM

Do not quote me on that one but i belive it is 9.5:1.

Eugene

wop · 06-14-2001, 03:46 PM

Quote:

EDIT--and that's because I have a MY00 not MY99, yes I am a moron...

HAHAHAHAHAHA... no your not.

thanks guys I will go with 9.7:1

-wop

Kevin Thomas · 06-14-2001, 06:04 PM

What makes the '99 2.2L motor a 10.0:1 compression ratio? My '97 2.2L is a 9.7:1 compression ratio. If I wanted the same compression ratio as the '99 2.2L, what changes would I have to do? Change the gasket, pistons, both? Thanks!

I was wondering how the '99 gained a little more horsepower and torque.

SubyTechMaster · 06-14-2001, 11:20 PM

Without comparing part #s I'm not sure about the pistons, but the '99 is a Phase II (camcase design, much larger valves). I'll have both motors apart next week and I'll try to take some pics of the differances.

ColinL · 06-15-2001, 01:13 AM

9.7:1

donjuan · 06-15-2001, 01:17 AM

My owners manual says 10:1.

EDIT--and that's because I have a MY00 not MY99, yes I am a moron...

[ June 14, 2001: Message edited by: donjuan ]

SubyTechMaster · 06-15-2001, 01:24 AM

'99 - 2.2L = 10.0/1
'99 - 2.5L = 9.7/1
2000 - 2.5L = 10.0/1

bill harvey · 06-15-2001, 03:14 AM

kevin i think it is the head design.

Gambit · 06-15-2001, 06:34 AM

wow bill harvey is member #11!!! wow!

why did MY2000 CR jumped to 10:1?

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06-14-2001, 12:36 PM	#1
wop Scooby Specialist Member#: 1931 Join Date: Jul 2000 Location: orange, ca Vehicle: 2000 00 impreza 2.2l wagon	what is the compression ratio on a... ...stock MY99 EJ25? thanks, -wop

06-14-2001, 12:57 PM	#2
25psi Scooby Specialist Member#: 3086 Join Date: Nov 2000 Location: Coram LI NY Vehicle: 2001 2.5 RS Silver	Do not quote me on that one but i belive it is 9.5:1. Eugene

06-14-2001, 06:04 PM	#4
Kevin Thomas Street Racing Instructor Moderator Member#: 110 Join Date: Jul 1999 Location: 1997 OBS Wagon 1996 SVX Vehicle: 1989 XT6 AWD/Auto	What makes the '99 2.2L motor a 10.0:1 compression ratio? My '97 2.2L is a 9.7:1 compression ratio. If I wanted the same compression ratio as the '99 2.2L, what changes would I have to do? Change the gasket, pistons, both? Thanks! I was wondering how the '99 gained a little more horsepower and torque.

06-14-2001, 11:20 PM	#5
SubyTechMaster Scooby Specialist Member#: 4423 Join Date: Feb 2001 Location: Placerville, CA USA Vehicle: '04 08 Tribeca, SVX Gold, Maroon	Without comparing part #s I'm not sure about the pistons, but the '99 is a Phase II (camcase design, much larger valves). I'll have both motors apart next week and I'll try to take some pics of the differances.

06-15-2001, 01:13 AM	#6
ColinL Scooby Guru Member#: 114 Join Date: Jul 1999 Chapter/Region: MWSOC Location: Wichita, KS and Whoring, OT Vehicle: '03 Evo, Rice White '01 Erion CBR 929	9.7:1

06-15-2001, 01:17 AM	#7
donjuan Scooby Specialist Member#: 2248 Join Date: Aug 2000	My owners manual says 10:1. EDIT--and that's because I have a MY00 not MY99, yes I am a moron... [ June 14, 2001: Message edited by: donjuan ]

06-15-2001, 01:24 AM	#8
SubyTechMaster Scooby Specialist Member#: 4423 Join Date: Feb 2001 Location: Placerville, CA USA Vehicle: '04 08 Tribeca, SVX Gold, Maroon	'99 - 2.2L = 10.0/1 '99 - 2.5L = 9.7/1 2000 - 2.5L = 10.0/1

06-15-2001, 03:14 AM	#9
bill harvey Scooby Specialist Member#: 10 Join Date: Jul 2002 Location: Aisle 3 next to the nuts Vehicle: 1998 2.5RS Brilliant Red	kevin i think it is the head design.

06-15-2001, 06:34 AM	#10
Gambit Scooby Specialist Member#: 102 Join Date: Jul 1999 Location: The meeting place	wow bill harvey is member #11!!! wow! why did MY2000 CR jumped to 10:1?