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RS+ Cylinder Heads

The Type 4 Store CS Camper Special heads (based on new AMC Bus castings) have 49-50cc chambers and have a .5mm stepcut; you would include the depth of the 0.5mm stepcut in the total deck measurement meaning for a total 1mm deck, you would want the piston to be 0.5mm in the hole (down from the top of the cylinder in the bore).

RS+ and LE200 Cylinder Heads (based on new AA castings) have 59-60cc chamber volumes and can be special ordered with a deeper flycut to reduce chamber volumes to 57cc including a step-cut if requested. Unless otherwise specified, all combinations are designed for use with Nickies cylinders other than the 94.5mm CS Camper Special JE Piston set that requires your original German 93 or 94mm cylinders to be bored out and honed to 94.50mm.

Our shelf 94mm pistons are flat tops with no valve reliefs, 94mm Camper Special pistons have a 10.9cc dish, and the 94.5mm Camper Special pistons have a 13cc dish.

Our Camper Special Plus 96mm pistons have a 13.5cc dish and our shelf 96mm pistons for both 71mm and 78mm+ strokes both feature flat tops with no valve reliefs. To achieve a 9.0:1 compression ratio on a 2056 with 1mm of deck height will require the RS+ or LE200 cylinder heads to be fly-cut deeper to reduce chambers to 57cc’s. This needs to be specified when ordering your cylinder heads as this is special order.

Our Mountain Climber 100mm pistons have a 8.9cc dish including valve reliefs.

Our shelf 102mm JE Pistons for the 71mm stroke are flat top and for 78mm+ strokes have a 4.1cc total dish volume including valve reliefs. 

The calculated compression ratios listed below are based off our Nickies cylinders and JE Pistons:

Displacement Bore Stroke CR w/ 1mm deck CR w/ 1.5mm deck
1971cc 94mm 71mm 8.25:1 7.89:1
1971cc 94mm CS 71mm 8.25:1 7.89:1
1992cc 94.5mm CS 71mm 8.10:1 7.76:1
2056cc 96mm CS 71mm 8.25:1 7.90:1
2056cc 96mm 71mm 8.64:1 8.25:1
2270cc 96mm 78.4mm 9.44:1 9.01:1
2316cc 96mm 80mm 9.61:1 9.17:1
2231cc 100mm MC 71mm 8.25:1 7.90:1
2320cc 102mm 71mm 9.49:1 9.01:1
2563cc 102mm 78.4mm 9.8:1 9.33:1
2615cc 102mm 80mm 10.03:1 9.54:1

NOTE: These are calculated compression ratios and not specific recommendations for your engine rebuild. The target compression ratio will will vary depending on application, what camshaft profile is used, fuel quality, altitude, whether you are using carburetors or fuel injection, timing, tuning, and many other variables. Pump premium unleaded fuels are required for all Type 4 Store engine kits. You should not exceed compression ratios listed above at 1mm deck for 93 or 94 octane fuels; areas with 90 or 91 octane will require the compression ratio to be lowered by increased the deck height to 1.5mm by shimming your cylinders.

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