| Racing Sleeves |
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Racing Sleeves
Wet Sleeves As the name implies, sleeves which are surrounded by water when installed are considered wet sleeves. The significant difference in sleeve design beyond the terms wet or dry are what structure within the cylinder carries the load. In a dry application the cylinder compressive force is carried by the sleeve and the block. In a wet sleeve application the compressive force is totally supported by the sleeve. Therefore, by nature of application and intended use, wet sleeves must be very strong and mechanically able to withstand compressive and frictional forces throughout their total unsupported length. Special wet sleeves are designed and supplied for transforming open deck engines in to semi closed or fully closed deck applications. Dry Sleeves Dry sleeves are named so because the sleeve body is not exposed to any cooling liquid within the block and is always installed in a block with an interference fit. Technical Issues Sleeves may be manufactured from cast iron, alloyed iron, ductile iron, steel or aluminum. Within the iron category sleeves may be manufactured using an as-cast procedure or a more common centrifugal die machine. Sleeve quality and consistency are more predictable using the centrifugal process. DP prefers and produces ductile Iron sleeves using the centrifugal process or billet steel sleeves for Iron blocks and Billet Extruded Aluminum 2618 or 4032 for Aluminum engine blocks. Special coatings like phosphate are also available on special order for both steel and aluminum sleeves. All Aluminum sleeves come complete with a Nikasil coating. Block Guard
For the full racing applications we design a closed deck conversion sleeve and that is what we recommend as best solution since sleeve rigidity inside the engine block is crucial.
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Block Guard, also known as a sleeve saver, is a special cnc machined aluminum brace that fits into open deck engines (such as Honda B series) and prevents the cylinder sleeve from flexing during high RPM, nitrous or high boost applications. DP, through dedicated research and development along with race experience, has designed a superior block guard sleeve saver that almost eliminates engine sleeve flex. The trick is to have a block guard that is strong enough to prevent flex in the sleeves, but also has properly positioned watering holes that allow your water and coolant to flow in the open deck design, and ensuring your engine continues to run cool. Various companies around the world are using cheap casted or pressed series block guards when our development uses the best available aluminum and is fully machined from billet plate fully certified Alcoa material.