SOHC & cam running clearance, base circles
Posted: April 1st, 2008, 9:12 am
Hello Everyone,
First things first, what a really cool forum , loads of really useful information.
Here goes with my first post.
I have a Fiat 128 with a 1500 Strada engine, modified head and 2x 40mm DCNF carbs, I recently removed the head to replace a blown headgasket (which wasnt blown). While I had the head off I thought Id check the cam shim clearances and found there is a range between 0.05 and 0.15 (2-6 thou) not much!!. I dont know the grind on the cam shaft so I have sent it away to be checked out.
Can anyone please explain to me why I need to know the grind of the camshaft in order to workout the clearance, I would have thought the clearance would be a constant only really allowing for the expansion in lenght of the valve as it gets hot or am I miss informed.
Andy Durber
First things first, what a really cool forum , loads of really useful information.
Here goes with my first post.
I have a Fiat 128 with a 1500 Strada engine, modified head and 2x 40mm DCNF carbs, I recently removed the head to replace a blown headgasket (which wasnt blown). While I had the head off I thought Id check the cam shim clearances and found there is a range between 0.05 and 0.15 (2-6 thou) not much!!. I dont know the grind on the cam shaft so I have sent it away to be checked out.
Can anyone please explain to me why I need to know the grind of the camshaft in order to workout the clearance, I would have thought the clearance would be a constant only really allowing for the expansion in lenght of the valve as it gets hot or am I miss informed.
Andy Durber