Muzzys Performance Products announces the availability of billet crankshafts
for the ZX-12R. The nature of a properly designed, machined from billet
crankshaft permits the use of longer strokes without a compromise
in reliability. These new crankshafts are precision machined from
4340 steel and are available in two stroke lengths, 60mm which is
4.6 mm over stock, and 62.4mm which is 7mm oversize. The crankshafts
are nitrided, micro polished, and feature ground gears. The 60mm crank
is available with standard bore spacing or offset cylinder spacing
for use with the Muzzy 87 mm billet block. All the longer stroke 62.4
mm cranks have offset rod journals for use with the 87 mm Muzzy block.
Both offset cranks do not incorporate a starter drive gear due to
rod clearance limitations , therefore they can be used ONLY with an
external starter. The 60 mm stroke, when used with a standard bore
spacing 85.4 mm Muzzy "1270" kit will yield a 1375cc engine.
When used with the Muzzy offset billet block you get 1427cc’s,
which is just the right size for NHRA Pro Stock. It’s likely
these cranks will become the standard for any true racing ZX-12 engine,
especially longer stroke turbo or nitrous applications. The following
engine size combinations are possible:
|
| Stroke |
Bore |
Engine
Size |
Features |
| 60 mm |
83mm |
1299 cc |
Stock bore
size |
| 60 mm |
85.4 mm |
1375 cc |
Uses Muzzy
1270 or turbo pistons |
| 60 mm |
87 mm |
1427 cc |
Offset
pins, NHRA Legal Size, external start |
| 62.4 mm |
87mm |
1484 cc |
Offset
pins, maximum size, external start |
|
|
