14-03-2019, 01:29 PM
Hi Dirk73,
I enquired with Newman in the 70's (time flies) about their range, this was after Chris Gould used a Newman profile on his record breaking Ulsteroid. They said then that they did three profiles of increasing severity; their 'road' profile, then the CG record car profile and then an 'Australian' race profile. The road profile had 0.281" lift and the later two had lifts of 0.320" so you may have one of those. The quoted timings for all three were; 15:55:55:15, 20:60:60:20 & 30:70:70:30.
See what it measures up at, and do it on a few cylinders to average the scatter in the readings and grinding. I suspect things will have moved on a lot since then and they can grind just about any timing on if there's enough material in the lobes so you may have something else. The traditional way of estimating the rev range a cam works is the inlet closing figure - the bigger the number the higher in the rev range.
Dave
I enquired with Newman in the 70's (time flies) about their range, this was after Chris Gould used a Newman profile on his record breaking Ulsteroid. They said then that they did three profiles of increasing severity; their 'road' profile, then the CG record car profile and then an 'Australian' race profile. The road profile had 0.281" lift and the later two had lifts of 0.320" so you may have one of those. The quoted timings for all three were; 15:55:55:15, 20:60:60:20 & 30:70:70:30.
See what it measures up at, and do it on a few cylinders to average the scatter in the readings and grinding. I suspect things will have moved on a lot since then and they can grind just about any timing on if there's enough material in the lobes so you may have something else. The traditional way of estimating the rev range a cam works is the inlet closing figure - the bigger the number the higher in the rev range.
Dave