Engle w110 Degreeing

pnikas · Post by **pnikas** » Sat Dec 12, 2020 11:44 am

Hello everybody,
I have ran into a headache trying to time properly an engine that will run with a w110 cam shaft
The timing paper numbers give 104.5 lobe centre to the intake
and a 111.5 lobe center to the exhaust .
If I were to retard the cam to achieve a 108 degree lobe center I would totally alter the degrees upon the intake and exhaust valves open and close . Now when measuring the cam does lift to the specified degrees stated on the paper, not having though a 108 degree lobe center

Bruce.m · Post by **Bruce.m** » Sat Dec 12, 2020 3:13 pm

You’ve lost me.

You can’t change the lobe centre angle by retarding or advancing a camshaft. With a single camshaft engine that number is fixed when the cam is machined. It’s the degrees between the intake and exhaust lobe peaks, on the camshaft.

pnikas · Post by **pnikas** » Sat Dec 12, 2020 3:46 pm

Bruce.m wrote: ↑Sat Dec 12, 2020 3:13 pm You’ve lost me.

You can’t change the lobe centre angle by retarding or advancing a camshaft. With a single camshaft engine that number is fixed when the cam is machined. It’s the degrees between the intake and exhaust lobe peaks, on the camshaft.

The equation for finding the lobe centers doesent have 108 as a result that’s my concern

SCOTTRODS · Post by **SCOTTRODS** » Sat Dec 12, 2020 4:42 pm

It's more likely the method used to find the 108, than that it doesn't have it... But call Engle. They should know their products better than anyone on here, and may walk through tings with you and help with the proper set-up. Or they may find the cam is not properly ground or cut.

Bruce.m · Post by **Bruce.m** » Sun Dec 13, 2020 3:31 am

pnikas wrote:
Bruce.m wrote: ↑Sat Dec 12, 2020 3:13 pm You’ve lost me.

The equation for finding the lobe centers doesent have 108 as a result that’s my concern

Are you basing that statement on measurements taken from the camshaft (which could have some machining tolerance or perhaps errors) ? ...

Or are you basing on the info provided on the cam timing card?

Bruce.m · Post by **Bruce.m** » Sun Dec 13, 2020 3:47 am

Ah. Figured out where your head is....

You have measured the lobe centre for the intake and exhaust, each from TDC. Because the cam card shows the cam figures for the cam positioned 3.5* advanced, the figures don’t match each other or the cam card.

But that is crankshaft degrees.

The sum of those figures is 216 degrees of crankshaft rotation, between the lobe peaks. The number is always the same no matter how much advanced or retarded the cam is.

Now divide that number by 2 to get the camshaft degrees for the lobe centre angle

UKLuke72 · Post by **UKLuke72** » Sun Dec 13, 2020 7:40 am

He means the intake lobe centre line
They grind them with a few degrees advance in there without telling you.

Installed 'straight up' would would actually require you to retard the cam with adjustable gears.

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