I own a 2017 Perodua Myvi Icon (Manual) that’s powered by a 3SZ VE, & I live in Malaysia. I’m looking to engineer a fuel efficient 4 2 1 exhaust manifold & am scratching my head as I don’t have access to manufacturer’s confidential data. Wondering if 3SZ VE from all regions share the same specs like cam profile & valve timing? Here are a list of specs I’m able to piece together:
Type: Gasoline, 4 Cycle DOHC, 16V with DVVT
Orientation: Transverse, Front Facing Exhaust
Number of Cylinder & Arrangement: 4 Cylinders, Inline
Bore x Stroke (mm): 72x91.8
Displacement (cc): 1,495
Max Output (kw/rpm): 72/6,000
Max Torque (nm/rpm): 136/4,400
Compression Ratio: 10:1
Firing Order: 1-3-4-2
Ignition Timing (°BTDC/rpm): 6 ± 2/idling (with check connector short circuited)
Engine Idling Speed in Neutral (rpm): 700
Shape of Combustion Chamber: Likely Pent-Roof
Shape of Piston Crown: Flat Outer Edges, Slight Concave Dish, Has Valve Reliefs
Shape of Exhaust Ports: Circular
Fuel Delivery: Multipoint Electronic Fuel Injection
Spark Plug:
Type: NGK DCPR7EA-9 (Copper Core, Nickel Tipped Ground Electrode)
Gap (mm): 0.9⁺0₋0.1
Heat Range: 7
Drive Belt Deflection with Force of 100N/10.2kgf (mm):
New Belt: 4.0~5.0
At Inspection: 8.0~11.0
Transmission: 5 Speed Manual
I’ve searched for valve specs but different websites have different measurements. Tried reverse engineering cam profile & valve lift of aftermarket ones to stock using ChatGPT O1 but don’t think it’s accurate. I’d be really grateful if anyone’s able to shed some light on these stock specs:
- Backpressure level & tolerable range
- Cam & valve info like timing, duration, lift (+curve of possible), valve size + flow rate of exhaust valves at various lifts, valve overlap period (crankshaft degree)
- Exhaust port length (distance between exhaust valve seat to exhaust flange face) & diameter/height & width
- Inner diameter of exhaust manifold’s primary tubes (estimated to be 1.2ish inch but need accuracy)
- Piston quench area
- Volumetric efficiency curve
- Distance between the exhaust manifold flange & the 1st bend
- Exhaust gas velocity from 0-6,500rpm
- Intake & exhaust valve angle
- CFM flow rate of exhaust gases
- Air fuel ratio
Thank you very much!