7cc OHC Single Cylinder Engine Assembly

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Bounding box: 60.0 × 100.0 × 123.0 mm
Engine: Precision B-rep
Parameters: 28
Published: November 2, 2026

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The prompt

make a 7cc single cylinder ohc engine exaclty like the honda cd 70 .

Parameters

Name	Value	Range
Bore Diameter	20 mm	15 – 25
Stroke	22.2 mm	15 – 30
Piston Height	22 mm	15 – 30
Conrod Length (center)	33 mm	25 – 45
Crankpin Diameter	12 mm	8 – 16
Piston Pin Diameter	8 mm	5 – 12
Crankcase Length (X)	60 mm	40 – 80
Crankcase Width (Y)	40 mm	30 – 50
Crankcase Height (Z)	35 mm	25 – 45
Crankcase Cavity Radius	14 mm	10 – 20
Cylinder Block Height	50 mm	40 – 60
Cylinder Block Outer Diameter	30 mm	24 – 40
Cylinder Head Length (X)	40 mm	30 – 50
Cylinder Head Width (Y)	30 mm	20 – 40
Cylinder Head Height (Z)	30 mm	20 – 40
Combustion Chamber Radius	10 mm	6 – 14
Camshaft Z Position	95 mm	85 – 105
Camshaft Length (Y)	30 mm	20 – 40
Cam Sprocket Diameter	15 mm	10 – 20
Crank Sprocket Diameter	20 mm	15 – 30
Chain Cross-Section Side	2 mm	1 – 4
Sprocket Y Offset (chain side)	-20 mm	-30 – -10
Piston-Top Clearance	1 mm	0.5 – 3
Conn Rod Width (Y)	6 mm	4 – 10
Conn Rod Web Width (X)	6 mm	4 – 10
Main Bearing Diameter	16 mm	12 – 20
Flywheel Radius	15 mm	10 – 20
Number of Cooling Fins	5	3 – 8

Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.

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