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One thing id like to see finely put to rest is the origen of the KLZE engine with the KL101 heads.I know 95% of KLZE came with the KL31 heads.And later in the dying years mazda put KL101 haeds on them for polision reasons etc.Id just like to have a answer for once and know which mazda it came out of,626.MX6,800,etc.What power it had compered to the KLZE KL31.Ive freaking looked for mouths tring to find the right info with little luck.Please guys help us out your my only hope all other mx3 sites are second best to youz...

Japanese: MS8 aka MX6 Japanese: Eunos 800: aka Pre-2000 Millenias American, European, Australian: 93-94.5 American, European, Australian: 94.5 to present American: 2000-up Millenias
Engine Code KLZE KLZE KLDE KLDE KLDE
Horsepower* 200 @ 6500 RPM 200 @ 6500 RPM 164 @ 6000 RPM 164 @ 6000 RPM 170 @ 6500 RPM
Torque (lb-ft)* 165 @ 5500 RPM 165 @ 4800 RPM 156 @ 4000 RPM 160 @ 4800 RPM 160 @ 5000 RPM
Compression Ratio* 10:1 10:1 9.2:1 9.2:1 9.5:1
Bore x Stroke *(mm) 84.5x74.2 84.5x74.2 84.5x74.2 84.5x74.2 84.5x74.2
Ports* Square Square D-shaped D-shaped Square
Head Codes KL31-101 and KL31-1A1* KL31-101 and KL31-1A1* KL-101 and KL-1A1* KL-101 and KL-1A1* KL-31
Cams Codes KL-31* KL-01* KL-01* KL-01* ??
Intake Manifold* Long Neck
Curved neck
Short Neck
Short Neck
Curved neck

VRIS #1 Open ??mm ??mm 750 rpms* 750 rpms* ??mm
VRIS #1 Close ?? ?? 3250 rpms* 3250 rpms* ??
VRIS #2 Open ?? ?? 4250 rpms* 4250 rpms* ??
VRIS #2 Close 6250 rpms 6250 rpms 6250 rpms* 6250 rpms* 6250 rpms
Stock RPM Limit* 7500 7500 7000 7000 7500
Fuel Pressure ?? ?? ?? ?? ??
Pistons* Flat Top Flat Top Dished Dished Dished
ECU KL31/36* ?? ?? ?? ??
Air Meter* JE-50 VAF MAF KL02 VAF KL02 VAF MAF
Japanese: MS8 aka MX6 Japanese: Eunos 800: aka Pre-2000 Millenias American, European, Australian: 93-94.5 American, European, Australian: 94.5 to present American: 2000-up Millenias

Yes they may of changed the heads on the later year ZE's, but they're also running lower compressions 9.5:1 pistons too. Sure it may be a "true" KLZE, but it's not "the" 198hp KLZE.

Nd4SpdSe can you elaborate. I profess my ignorance of this before God and Man. I never know we had KLZE's that had lowered HP.

Hey guys finely found out what engine i got in my mx3,its a KLDE KL-G4 from a mazda 626 year 98-2002.Thanx for all the info you gave us.Cheers