17 replies to this topic

[skoughi]

I had a little look inside my engine a while ago, checked the condition of the bores etc and also pulled out the camshaft to see what breed it is. However I couldn't see any obvious markings. So I'm hoping someone on here could help I.D. it for me. I can measure the lobes with a vernier caliper to see what lift there is on the inlet and exhaust and take a few pics but what else do I need to measure and check for someone to work out what it is?

Attached Files

•  06-05-11 003.JPG   49.3K   17 downloads
•  06-05-11 004.JPG   52.3K   21 downloads

[racingenglishcars]

I tried to determine the duration by checking the start and finish of a lobe as in these pictures. Remember the cam turns half the speed of the crank and duration is measured in crank degrees.



Then I looked up the cams on this site for comparison.

http://www.mlmotorsp....php?topic=11.0

[skoughi]

I was thinking that I'd need to check the duration, I've a mate who works at an engineering firm who I'm sure would be able to put it on a lathe then check with a gauge for when the lobe will open to when it will close. Both inlet and exhaust lobes have a lift of 6mm, I would've thought they'd been different?

[ACDodd]

Is the cam in the picture slot drive?

AC

[skoughi]

Here's the drive end.

 009.JPG   206.6K   13 downloads

Edited by skoughi, 18 October 2012 - 07:34 PM.

[racingenglishcars]

You need to measure lift with accuracy to 0.01mm
When measuring duration, commonly it's measured from the point where the rocker arm has 0.010 inch lift

[skoughi]

Ok, I just checked with the first set that came to hand, I'll look tomorrow to see if we have a more accurate set. You say that I should measure duration at the rockers, does this mean I can't measure it straight off the cam itself? Or is there a calculation I have to do if I measure direct from the lobes?

[ACDodd]

If you measure at the lobe at 0.016" checking height you can compare tot he figures listed in the link above. See my miniworld article for how to measure cams.

AC

[skoughi]

If I buy a cam with a slot drive can I simply change my oil pump,A-series block, to suit?

[mailman]

Is your Miniworld article online anywhere AC?

If not, could anyone elaborate on how to measure/confirm camshaft grinds?

Thanks.

[ACDodd]

http://www.kelseysho...product_id=2049

Too much to type!!

AC

[mailman]

Thanks.

Ordered! April 2012, correct? (I hope so..)

What tools do I need to acquire in the next 7-10days before it arrives?



Now to track down those tools and a DTI/ Timing Disc for timing the Cam in.

[ACDodd]

You need a couple of dial gauges and magnetic bases. Some Dial gauge extensions are also very useful.

AC

[racingenglishcars]

http://www.avs.spot-...DegreeWheel.png
http://www.hotrodder...degreewheel.jpg

I simply printed one of these and glued it to cardboard

[mailman]

Awesome, thanks so much guys!