mitchrst

when you adjust a newman cam and set the gap with feeler gauge do you measure the gap with the rocker locknut undone or tight ?

rstdave

iTrader: (3)

Gotta be done up tight as it will move when u tighten it up again otherwise! Bit fiddly but not too bad when u get into it.

mitchrst

anyone got a copy of performance ford when they fit a newman cam to a cvh and tell you what lifters to adjust when a certain valve is open if someone could please post the text here

Christian and Beccy

iTrader: (14)

Tightening the Rocker Nut to the correct torque is critical too, when adjusting the clearances.

You sure you can do this job? It's not quite the DIY job that some would have you believe.

mitchrst

ive fitted cams in the past but never a solid lifter one it just takes some time to adjust them right i guess

Christian and Beccy

iTrader: (14)

Fitting a hydraulic profile cam is a piece of piss, you just bang the cam in, drop the followers in their holes, job done. Adjusting solid followers is a different ball-game altogether. Putting the cam in is the easy bit.

We usually set mine up totally dry, then once they are all checked/set, I remove everything, clean it all up and reassemble it with Graphogen as a cam lubricant, before carrying out the running in process.

It's a seriously time-consuming job to do it properly, those that say it isn't just aren't doing it properly IMO.

rstdave

iTrader: (3)

Agreed....not somethin u can rush and does take time as said above, i've had a newman cam for a couple of years now and after doin the job a few times i can see why a tuner would charge seemingly silly money to fit the cam/lifters for you! C+B...how often do you find you need to readjust your lifters, do you do it as a matter of course or when they start to get noisy?

Canada1

Are performance camshaft profiles available for the hydraulic roller lifter
type in the UK?
In the USA and Canada a 1.9 HO was available with a hydraulic roller lifter. The camshaft specs are: 276 deg int/ 276 deg exh. duration. 116 degree lobe center. 0.440"(11.17mm) lift. Opening/closing events are:
intake opens 22 deg BTDC closes 74 deg ABDC
exhaust opens 74 deg BBDC closes 22 ATDC
The roller lifter eliminates the camshaft wear issues.

Cheers

DazC

iTrader: (1)

The roller lifters were only fitted to the 1800 CVH over hear wich wasn't really a good engine to tune and nobody ever really did. That meant that no one really made a cam for use with roller lifters. If you use the roller lifters with a none roller profile you will lose a bit of cam duration.

Of course, this doesn't stop custom profiles from being made.

Canada1

Roller lifters require a very hard or billet camshaft without the slightly sloped lobe that rotates a standard flat tappet lifter.
The roller diameter reduces the actual duration on a given lobe profile, however the lobe profile is much different on a roller lifter designed camshaft - which takes into account the roller diameter.
The opening and closing events I listed are directly comparable to a flat lifter specification, where valve events are measured as lifter rise.

Cheers