Written by Moore Good Ink
Columbia, SC, August, 2009: RAM Clutches are well-known to drag racers whose engines exhibit more than 2,000 horsepower and RAM’s street repertoire is no less efficient. The company has just announced a new twin-plate high-performance DirectFit StreetDual (PN 90-2115) clutch/flywheel assembly for the ZR1 Corvette supercharged LS9 engine and GM Performance Parts LS9 engines.
This assembly is directed at street applications and is a bolt-in upgrade for the factory twin-disc hardware. Its dimensions are similar to the original: overall height is comparable to stock measured from the crankshaft flange to the fingers of the cover assembly and it has a diameter of 10.5 inches.
From here on out, the benefits of the DirectFit StreetDual assembly over the stock unit are exemplary. The diaphragm clutch assembly weighs a whopping 10 pounds less, exhibits a 2400-pound clamp load, and employs a nodular iron pressure ring for strength.
The twin friction discs employ RAM 300-series organic material, the chief advantage being that organic friction material has superior blend of holding power and improved drivability without the tendency to chatter on initial clutch release. Concurrent, the top clutch disc springs are stiffer than stock and by encasing them in urethane, their rate of compression increases approximately three times that of an uncoated spring.
Simple computer tweaks easily elevate the LS9 power rating to more than 700horsepower. As a result, the RAM StreetDual assembly has the capacity to capture as much as 1000 horsepower at the wheels while providing stock drivability. A 900 series disc version is available for higher horsepower applications (90-2115N). Since this clutch/flywheel assembly will combat greater rotational forces than the stock assembly, RAM provides it with steel friction backing. Further, the facing is riveted steel-to-steel in direct contrast with factory non-back facings.
RAM is aware that all your questions about the DirectFit StreetDual experience may not be addressed here. To that concern RAM has a wise and able team that can provide valuable, free information.
For further information contact:
RAM Automotive Company
201 Business Park Blvd.
Columbia, SC 29203
Telephone (803) 788-6034 or visit: www.ramclutches.com