New HRP Cams for Injected and Carbureted4-cam style engines now in stock.

We have just receivedthe first shipment of our new Billetcams in from the manufacturer. We have been working on design and testing of several different cam combinations over the past 4-5 years with Legendary cam grinder Jim Leineweber and his son Justin. As a result, we now have a new grind for the 4-cam engines running the 86-90 XL style set-up. This includes the Overkill, PRP,our Derringer engines and others that use the 4-cam valve train. The injected cams (HR-J) are designed for 150 - 200 cubic inch Nitro engines. Improvements include a much larger diameter cam lobe that improves lifter roller to cam lobe contact. This design also allows the cammanufacturer more flexibility in designing the profile of the lobe. We spent many hours designing and testing our new injected grind with the main objective to relieve some of the extreme exhaust pressure the exhaust valve has to open against. This is the main reason for pushrod, lifter and rocker arm failure in these engines. The larger lobe diameter has allowed us to do that sothe valve train has it a bit easier opening the exhaust valve. Valve lift is .865" with a 1.74 rocker ratio.

The carbureted cams (HR-E) have the larger camlobes as well and gives .745 inches of valve lift with a 1.62 rocker ratio, and a bit more duration that our HR-1 cams that have been in our Derringer engines for years.

The E cam grind is also available for our Gen-4 upgrade.

For more information contact,
Hawaya Racing, Inc
1333 N. Minton Rd.
Millers Creek, N.C. 28651

Ph. 336-973-5078
Fax 336-973-5079


 Copyright 2017  Drag Racing News. All Rights Reserved.