Dry Cylinder Liners for Porsche® 928, 944, 951 and 968 Engines
STEEL CYLINDER WALLS FOR YOUR ALUSIL BLOCK:928 Motorsports has a proven process for inserting dry cylinder wall liners into the water-cooled Porsche blocks.
UNIQUE DIFFERENCES: Although higher in initial cost than the Nikasil repair/coating of engines (which we also offer here: ), high-ductile iron cylinder liners offer unique differences over a plated aluminum block:
Re-boring to a 4" or 4 1/8" bore permits the use of standard forged pistons, with a reduction in piston cost of often over 200% from custom (metric) piston sizes.
Adding high-ductile, high strength iron liners is ideal for high-boost applications (15 psi and up) where an unsupported aluminum wall will stretch under pressure and fail.
An inexpensive way to add displacement. Imagine taking your 100mm bore Porsche 928 5.0L motor, and by moving to 4.125", you now have a 5.4 liter motor with the stock crankshaft, or 6.54L with our stroker crank!
Can also be used to repair deeply scratched cylinder walls and will completely renew the block.
ADDS SERVICABILITY: when an aluminum bore becomes scratched, the repair process either includes boring all cylinders to the next oversize dimension and buying all new pistons, or welding up the scratch, boring it down, and replacing the piston. Both expensive. Should a steel liner become scratched, the liner can be pulled out and a new one installed. Much less expensive!
O-RINGING and HEAD GASKETS: The custom T-top on the 928 Motorsports engine liner provides the ideal location for a stainless steel o-ring (optional) that will provided a positive seal on the head gasket against any amount of boost. The heads do not need to be modified with this design. Or you can order our MLS head gaskets and no o-rings are needed. Our large T-top sleeves provide a terrific sealing surface!
OUR CYLINDER LINING SERVICE:
Ship your bare block to us at 928 Motorsports, LLC. Prepare your block by removing all the steel from the piston decks, like locating pins and head studs. Send just the bare block, no crank or rods installed. If there are steel parts in the block deck that you cannot remove, they will be removed for you but you will be charged extra for this service. The block does not have to be clean.
Let us know what your plan for Pistons is. It is smart to ship one of the pistons you want to use with the motor. This allows us to bore-to-fit that exact piston.
The price in this listing covers the standard 6-part process:
Boring the stock cylinder walls down to receive the new dry-wall cylinder liners.
The whole block is heated in to an oven and then the cylinder liners are pressed into place.
The cylinder walls are honed to match the pistons.
The decks are planed for flatness
The o-ring grooves are cut into the top of the liners (optional).
The finished block is tanked for cleansing before it is shipped. The cylinder walls will be lightly oiled to prevent surface rust and the block will be closed in a heavy engine bag for shipping.