Will it blend

[Daugaard]

was the first thought when I saw this when removing the cam cover.

The cam must have skipped a tooth before I tightened the chain.
But when I saw the next is was not so bad.
Perhaps the po did not look at the markings but concentrated on the timing itself.

To you who do not know the Youtube show Will it blend here is a link.
http://www.youtube.com/watch?v=2AyoddDCT_s


My motor is an original Stromberg model (s/n L21774), H stamped on the head.
The ports and combustion chambers have been gas flowed, it has been converted to Big valve and lead free.
The cam has been changed from L14 spec to what I have now and it seems to be a B type. No grove.
MC23929 D B26E351 on the intake and MC 23929 C B26E351 on the exhaust.

When I measured the lift of the cam( Hight 39,4 mm minus with 30,6 mm) it ends on 8,8 mm lift(0,3465 inches) but in the Miles Wilkins book it states that a B cam has a lift of 0,375 in total.
Could it have been reground?
Could this cam be the reason for the rough tic over I have?
The carbs have been refurbished, and the ignition has also been overhauled and the compression is
quite good, so everything here is ok.
What type of cam could be installed without further changes? D type, Super S/E was in my mind.
I here think of springs, bearings and so on.
I still need to check the degrees of the cam, but I am hit hard with lots of work.

Regards Jens

[rgh0]

You have what looks like Burton adjustable cam sprockets, so timing needs to be set from measurement of top dead centre and cam maximum opening point using a degree timing wheel. The PO appears to have marked the cam sprockets but what those makings represent is a guess unless some further information is provided.

The cam you have measured appears to have a standard base circle of 1.2 inches and the standard lift for the B cam of 0.35 inch so it is likely it has not been reground and is probably a B cam if it has no groves in the front sprocket mount flange. The D cam (Super SE / Sprint cam) had a .36 inch lift and 272 degrees duration and is the best cam to use if keeping standard valves/ followers / springs in a road car. Maximum lift usable with standard springs is around 0.37 inch and to go to the modern high lift short duration road cams such as the 0.42 inch lift QED 420 cam you need to replace the springs and potentially the valves and followers depending on the details of how the installation is done

you would need a tough blender to eat up the hardened steel in your cams and sprockets
cheers
Rohan

[Daugaard]

Thanks for the reply Rohan.

I will see if I get the time to check the setting of the cam later this week.
The Miles Wilkins book stated that the B cam have a lift of 0,375 in total so that must be
a type error.The engine have a very bad tick over all the time I have had it so I thought
it might be the cam setting that was way off as all of the rest have been checked.
When driving at higher revs it is ok.
Could it be the B cam that causes this?

Regards Jens

[rgh0]

Hi Jens
The B cam is a very mild cam and should idle very well. it could be cam timing, carb setting or ignition timing or bad plugs and / or other ignition components. Just need to work through all the possibilities in each areas until you solve it. Given you have non standard cam sprockets starting with cam timing is probably a good place. Jetting for the carbs may be wrong if it was originally fitted with a different cam.

cheers
Rohan

[Daugaard]

Hi Rohan.

Ok. Will give the cam setting a try when time allows me.
The carbs have been refurbished, the ignition timing set according to manual, only thing to test is the Luminition to check if it has an Issue when cold.

Thank?s again Rohan

Regards Jens

[rgh0]

You can only take the manual carb and ignition settings as a rough guide. You need to play a little to find what suits you engine and your fuel. Also quite a few errors in the various manual editions

cheers
Rohan