compression ratio difference

okay, i've heard from many people, one of them is jose of shreveport louisiana, the jose of rotaries, have told me that the mazdaspeed engines and the mp3 engines, fs have different compression ratio, that the mp3 have 10:1 and the speed have like 8:5:1

nope, they are the same. I believe they are both 9:1 but dont quote me on that

that was just coming off the top of my head on the ratios but the question still stands

Props to TheMan and the protege faq.

2.0 liter engine:
Type
FS-DE
Displacement
1991cc
Cylinders
4
Valvetrain
DOHC 16 valve, direct shim over tappet actuation, timing belt
Horsepower
130hp @ 6000r/min (SAE net)
[MP3: 140hp @ 6000r/min (SAE net)]
Torque
135lbs/ft @ 4000r/min (SAE net)
[MP3: 142lbs/ft @ 4500r/min (SAE net)]
Bore & Stroke
83mm x 92mm
Compression Ratio
9.1:1
Induction Type
Natural
Redline
6500r/min
Alternator output
12V 80A
Ignition type
distributor-less coil pack
Fuel system
Multipoint EFI
Fuel injector rate
285ml/min
Manual Transmission type
G15M-R
Valve Timing
Intake cam duration
230 @ 0.003"
Intake cam opening
2 BTDC
Intake cam closing
48 ABDC
Intake cam lobe height
43.700mm (1.7205")
Intake cam base circle
35.052mm (1.380")
Intake valve lift
8.6487mm (0.3405")
Exhaust cam duration
230 @ 0.003"
Exhaust cam opening
48 BBDC
Exhaust cam close
2 ATDC
Exhaust cam lobe height
43.225mm (1.7018")
Exhaust cam base circle
35.052mm (1.380")
Exhaust valve lift
8.1737mm (0.3218")
Valve overlap
4

2.0 liter engine:
Type
FS-ZE
FS-ZE (MazdaSpeed)
Displacement
1991cc
Cylinders
4
Valvetrain
DOHC 16 valve, direct shim over tappet actuation, timing belt

Horsepower
168hp @ 6800r/min (JIS net)
[MY2002.5-2003: 163hp @ 6800r/min (JIS net)]
173hp @ 6800r/min (JIS net)
Torque
131lbs/ft @ 5000r/min (JIS net)
[MY2002.5-2003: 128lbs/ft @ 5000rpm (JIS net)]
134lbs/ft @ 5000r/min (JIS net)
Bore & Stroke
83mm x 92mm
Compression Ratio
10.4:1
10.7:1
Induction Type
Natural
Redline
7000r/min
Alternator output
12V 80A
Ignition type
distributor-less coil pack
Fuel system
Multipoint EFI
Fuel injector rate
285ml/min
Manual Transmission type
G15MX-R
G15M-R
Valve Timing Standard
MazdaSpeed
MazdaSpeed
(revised/TSB fix)
Intake cam duration
241 @ 0.003"
241 @ 0.003" 241 @ 0.003" Intake cam opening
5 BTDC
5 BTDC 5 BTDC Intake cam closing
56 ABDC
56 ABDC 56 ABDC Intake cam lobe height
43.700mm (1.7205")
43.700mm (1.7205") 43.700mm (1.7205") Intake cam base circle
35.052mm (1.380")
35.052mm (1.380") 35.052mm (1.380") Intake valve lift
8.6487mm (0.3405")
8.6487mm (0.3405") 8.6487mm (0.3405") Exhaust cam duration
230 @ 0.003"
240.8 @ 0.003"
241 @ 0.003"
Exhaust cam opening
48 BBDC
48.3 BBDC
55.5 BBDC
Exhaust cam close
2 ATDC
12.5 ATDC
5.5 ATDC
Exhaust cam lobe height
43.225mm (1.7018")
43.700mm (1.7205") 43.700mm (1.7205") Exhaust cam base circle
35.052mm (1.380")
35.052mm (1.380") 35.052mm (1.380") Exhaust valve lift
8.1737mm (0.3218")
8.6487mm (0.3405") 8.6487mm (0.3405") Valve overlap
7
17.5
10.5

2.0 liter Turbo engine:
Type
FS-DET
Displacement
1991cc
Cylinders
4
Valvetrain
DOHC 16 valve, direct shim over tappet actuation, timing belt
Horsepower
170hp @ 6000r/min (SAE net)
Torque
160lbs/ft @ 4000r/min (SAE net)
Bore & Stroke
83mm x 92mm
Compression Ratio
9.1:1
Induction Type
Turbo
Redline
6500r/min
Alternator output
12V 80A
Ignition type
distributor-less coil pack
Fuel system
Multipoint EFI
Fuel injector rate
285ml/min
Manual Transmission type
G15M-R (w/LSD)
Valve Timing
Intake cam duration
230 @ 0.003"
Intake cam opening
2 BTDC
Intake cam closing
48 ABDC
Intake cam lobe height
43.700mm (1.7205")
Intake cam base circle
35.052mm (1.380")
Intake valve lift
8.6487mm (0.3405")
Exhaust cam duration
230 @ 0.003"
Exhaust cam opening
48 BBDC
Exhaust cam close
2 ATDC
Exhaust cam lobe height
43.225mm (1.7018")
Exhaust cam base circle
35.052mm (1.380")
Exhaust valve lift
8.1737mm (0.3218")
Valve overlap
4

so everyone else was right then?

how is the compression on the mp3 for boosting?

In summary; All US model Mazda Protege's featuring the 2.0L FS engine have the same CR. 9.1:1

The compression on the MP3 is the same, but the timing is far, far advanced, so without an EMS to control timing, or the more 'casual' timing of the P5 style ECU, plus fuel managment, you're going to have a time of it, unless you limit boost to about 4 psi, if that, depending on the turbo you use.

merci beaucoup

i've heard the msp pistons were dished...is that true?