[Fot] Re TR4 camshafts

[Duncan Charlton]

Hi Patrick,

You didn’t say whether you determined how many degrees of advance/retard you’re putting in by setting max lift at 110˚ ATDC.  Confirming that figure ought to give you some confidence that what they’re telling you is in the ballpark.  2 to 4 degrees advance seems appropriate for a street engine.

Since you've been in the business for a while (I’ve heard your name in Morgan circles for many years) I assume you already have the tools and knowledge to do this, so I won’t go into a long-winded description of the process, but for those reading this who haven’t done this before:  put a degree wheel on the crank, zero it at true TDC and measure lift at the cam or at the valve using a dial indicator, starting a few degrees before max lift and ending a few degrees after max lift to be sure you’ve found mean maximum lift.  Do this for both intake and exhaust and calculate the midpoint between those two mean maximum lift points.  That gives you the cam's “zero” point.  Decide whether to advance or retard a few degrees from zero.  Advancing moves torque lower down on the rpm scale (but also decreases intake valve to piston clearance).  I find I have to plot this on paper so I can make sense of it and to make sure I don’t move the the wrong direction in altering the valve timing.

Newman overstated lift by 34%.  Wow.

Duncan

> On Oct 23, 2017, at 2:48 PM, John Styduhar via Fot <fot at autox.team.net> wrote:
> 
> ​Follow the instructions for setting the cam and you will be fine.  An adjustable cam sprocket will make the job easier.  
> 
> On Mon, Oct 23, 2017 at 11:54 AM, riverside--- via Fot <fot at autox.team.net <mailto:fot at autox.team.net>> wrote:
> Yikes!   I  have always had great success with Dema's cams.
> I hope his shop survived the fires.
> 
> art de armond
> 
> -----Original Message----- From: patrickmannion1--- via Fot
> Sent: Saturday, October 21, 2017 5:11 PM
> To: fot at autox.team.net <mailto:fot at autox.team.net>
> Subject: [Fot] Re TR4 camshafts
> 
> Hello all,
> I have always nearly always built Triumph TR4 engines with cams from Dema Elgin Superlobes in Santa Rosa. Occasionally I had installed other cams supplied by customers that had a valid timing card supplied. I decided with the English pound being low vs the Dollar I would try the PH1 Cam from Newman Cams in England. I had heard good things about their PH1 cam as being a great street cam.
> 
> When installing the cam. Information on there website stated peak cam lift was .295" (it is only .220") resulting in a lift at the valve being .120" less than stated. Starting off with" incorrect lift figure all valve event figures on the website are wrong. After several emails I got a two sentence email saying ,set Intake for max lift at 110 degrees ATDC and the cam will work,
> 
> After doing lots of engine modifications I would like a more scientific answer than the cam will work. Has anyone used this cam or a Newman cam before, or found that the information supplied by Newman was incorrect. I hate to eat the cost of the camshafts I bought or incur the cost of sending them back to England, but I would have no confidence in using a camshaft without having a correct timing card for the camshaft. -
> thanks
> Pat Mannion
> Santa Cruz California
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