Dunstal camshaft

Nicke

Joined
Nov 16, 2013
Messages
1
Hi
Im rebuilding the engine on my P11 ranger and i need some help
The cam shaft is markt PD -03 Z 320 its in good condition so I'm going to reuse it so i need some information

Best regard

Nicke
 
Nicke said:
Hi
Im rebuilding the engine on my P11 ranger and i need some help
The cam shaft is markt PD -03 Z 320 its in good condition so I'm going to reuse it so i need some information

Best regard

Nicke
Click to expand...



Don’t have the infor on Dunstall cams any more, but for heaven’s sake check cam lobe timings with timing disc before you insert engine into frame
 
I don't think those graphs tell you what the cams do when in the motor. Even some rhetoric about when they are used with standard inlet and exhaust systems would help. One of the examples mentioned that the cam had come from a destroyed motor. If the cam moves the power band up the rev range, you can get that more easily ?
 
I can see I will have to a lot more research on Norton cams. Unfortunately I believe a lot of guys work towards increasing the top end power by increasing the rev limit, and I don't want to go that way. Which common cam gives the most mid-range in an otherwise standard commando ?
 
http://atlanticgreen.com/images/camgrind.jpg

Here’s a pic of checking the cam lobes out of the engine-me thinks I can easily make something similar out of wood, using a couple of camshaft brushes (or make your own).
All I need is a cut –off from a kitchen top, or a simalar plastic covered door, a few long bits of wood to make a L shape drill a small length of something like a 3” x3” drilled for the brushes then cut in two- I already have the clock gauge but need a degree disc as a mate nicked mine.
 
Good idea there Bernhard.

@Nickie: You could also take a pair of vernier calipers and measure from the cam base circle to lobe tip for intake and exhaust to check max lift and symetry then compare to the charts at

http://atlanticgreen.com/camsurvey.htm

and elsewhere to get a sense of exactly what the cam is all about but as Bernhard said, check and make sure.
 
It is easy to put a dial mike on the valve cap, and degree disc on the crank, then you don't have to multiply by two to get the picture. Also you can see the effects of the bits of the associated valve train,as they move. I do it with nil clearance. If the motor is in the frame you need two people.
 
Or assemble cases, crank, cam, cam drive, barrel and tappets and set dial indicator on each of the pushrods without the head in place. Just use a couple of bolts for assembly to hold things in place.

Or you can wait until you are assembling the motor to sort out the cam timing.
 
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