The V8 Owners Forum -

hi All
I used a thrust button from Real Steel on my cam when building the engine but i cannot find an end float measurement anywhere for it now.
I ask only for my mate as he is using a standard cam bolt but we cant find an end float measurement any where in the manuals.
I know that the travel is limited by the dizzy drive gear and it sould not be a problem but my mate reckons he has about 4mm of end float which to me seems excsessive.
Anyone put us straight on this please

cheers
P

gelmonkey wrote:hi All
I used a thrust button from Real Steel on my cam when building the engine but i cannot find an end float measurement anywhere for it now.
I ask only for my mate as he is using a standard cam bolt but we cant find an end float measurement any where in the manuals.
I know that the travel is limited by the dizzy drive gear and it sould not be a problem but my mate reckons he has about 4mm of end float which to me seems excsessive.
Anyone put us straight on this please

cheers
P

Mr. Monkey are you asking on behalf of Paul? (aka MuscleManta)

No mate
For my friend Tony.
Have you heard from Paul as i have been trying to get hold of him and no answer to phone calls or text 's.
I am after the article you wrote for the Cobra guys regarding setting up timing on the Rover lump.

Could you Email it to me please?

Thank you.
cheers
P

gelmonkey wrote:No mate
For my friend Tony.
Have you heard from Paul as i have been trying to get hold of him and no answer to phone calls or text 's.
I am after the article you wrote for the Cobra guys regarding setting up timing on the Rover lump.

Could you Email it to me please?

Thank you.
cheers
P

Hi Mr. Monk,

Paul is in Cuba at the moment, I think he get's back mid week. Paul and I are building an old 3.5 at the moment, its for a car that William Martin-Hurst once owned, the engine number is EXP12 (Experimental 12, the 12th of the first 20 experimental engines that Rover built), thats why asked whether you were asking on behalf of Paul. Anyway we are going to fit a cam button, I was thinking of fitting the button so that there was no side play in the camshaft at all when the front cover is fitted without a gasket, then the thickness of the gasket would give I guess 0.25-0.5mm of play.

With regards to the gumph that I wrote on timing, I still think the most of of it is correct but I have one or two new ideas which I have not tried yet, anyway the link is here, its below the stuff on braided hoses...

http://how-to-build-a-pilgrim-sumo.wiki ... by-members

Cheers,

Pete

Hi Pete

Thank you so much for this .

Much appreciated.
Cuba huh?
Bloody doley ha ha

cheers
P

Hi Paul,

I set mine at 0.005"/0.127mm using a finger clock on one of the cam lobes.
The front cover was on & off three or four times before I got it right.

The question is what is really needed and what is felt
to be done a bit lazy by the Rover company but does no harm.

So the cam lobes have a slight angle to both rotate
the lifters and cause a force to push the cam inside
the housing. Normally they press against the housing
and never move away towards the thrust button.

On the other hand I always put the cam in the lathe and
modify the end to accept the later plate to be bolted
to the engine block. The threads can be cut easily into
the block first before all is put together.

In my opinion that is the only perfect solution
but the thrust button on the bolt does no harm.

Whoever is thinking about that solution he should look
inside the cover, there is a little hill in the casting
and the button has a similar hill from plastic.
It is easy to understand that this combination is not made
to accept axial load from a higher grade or loger time.

[quote="Triumph-V8
So the cam lobes have a slight angle to both rotate
the lifters and cause a force to push the cam inside
the housing. Normally they press against the housing
and never move away towards the thrust button.


Just to add, The load from the oil pump on the cam gear also tends to keep the cam against the engine block. I have in the past fitted the button device on an engine and found no wear marks on the timing cover after several thousand miles. The later engines with the retaining plate have crank driven oil pump and maybe Rover now considers the retaining plate necessary given the lack of load from the oil pump.
The original engines were tilted back at 5 degrees also which tended to keep the cam against the block.

If you are running a dizzy then less timing scatter will occur if the cam is prevented from walking.

Thanks guys
As always the mine of information on here is staggering and so helpful.
Have all the info we need now to proceed .

Thanks again

cheers
P