12-11-2020, 11:13 AM
(This post was last modified: 12-11-2020, 11:16 AM by Tom Coates.)
Newman have provided me with a list of their standard cam profiles. It looks as if the first 3 would be suitable for road and light competition use on a light car with C/R gearbox and strong engine. Does anyone have experience of them?
I assume that 260° duration is about the limit for a road engine? It is interesting that they offer a cam with higher lift and shorter duration (A7/256/308) and one with lower lift but longer duration (A7/260/270). Any thoughts on how these would differ in performance?
Part Number Duration @ 0.010" Camshaft Lift Lobe Centre Angle
A7/256/308 256° 0.308" 110°
A7/260/270 260° 0.270" 110°
A7/260/325 260° 0.325" 110°
A7/268/310SC 268° 0.310" 110° Super Charge Camshaft
A7/284/320 284° 0.320" 107.8° Race Cam
A7/284/325 284° 0.320" 107.8° Race Cam
A7/252/314 252° 0.314" 110° Trials Cam
From what I understand a cam with 0.308" lift will fit through the centre bearing hole on a standard crank case but not one with 0.325", is that correct? I have a ten stud block so not too worried about it lifting from the crank case, but noise and wear of the cam followers are also a factor.
Will these cams generally fit out of the box or do they need they need keys and gears to be modified to get the correct timing?
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PS, sorry about the small font, can't seem to make it any bigger!