-Ta performance Hardened and grooved cam bearings
-Comp 212/212 flat tappet.
-stock untouched 109 block
cam fits fine in rear 3 bearings.
when I installed the front bearing the cam barely fits through and I can barely turn it by hand. I had to remove the bearing and scotchbrite the bore and outside of the bearing, as well as the cam journal to get it to fit through at all. the cam also has about 30 degrees of rotation that are tight versus the rest which is why i want to know if the cams straight or not.
I took the cam to the machine shop to see if its straight. I am thinking the cheapest, easiest, and quickest option is to have the camshaft itself polished down a bit. clearance spec is 0.0005-0.0025 so why not just turn the cam down from 1.7856-1.760 to 1.7850 which is the min spec for the cam journal diameter. The old cam fits decent but is a little on the tight side. I'm also going to order a new set of bearings since i wonder if the front cam bearing is a little messed up because i drove it in from the front the first time.
Machine shop wants to line hone the new bearings. I'm sure that's the right way to do things, but i really feel like turning the cam down would be good enough for who its for. this is a stock bottom end, stock turbo car with alky and 20psi of boost that might get 1000km a year at most. With the combination of the earl brown oil mods, grooved hardened bearings, and the camshaft and block having an oil groove, why wouldn't just polishing the cam down work?
in journal 1-4 i measure 1.7858 1.7856 1.7860 1.7860 on the new cam and 1.7855 1.7852 1.7854 1.7855 on the old cam
-Comp 212/212 flat tappet.
-stock untouched 109 block
cam fits fine in rear 3 bearings.
when I installed the front bearing the cam barely fits through and I can barely turn it by hand. I had to remove the bearing and scotchbrite the bore and outside of the bearing, as well as the cam journal to get it to fit through at all. the cam also has about 30 degrees of rotation that are tight versus the rest which is why i want to know if the cams straight or not.
I took the cam to the machine shop to see if its straight. I am thinking the cheapest, easiest, and quickest option is to have the camshaft itself polished down a bit. clearance spec is 0.0005-0.0025 so why not just turn the cam down from 1.7856-1.760 to 1.7850 which is the min spec for the cam journal diameter. The old cam fits decent but is a little on the tight side. I'm also going to order a new set of bearings since i wonder if the front cam bearing is a little messed up because i drove it in from the front the first time.
Machine shop wants to line hone the new bearings. I'm sure that's the right way to do things, but i really feel like turning the cam down would be good enough for who its for. this is a stock bottom end, stock turbo car with alky and 20psi of boost that might get 1000km a year at most. With the combination of the earl brown oil mods, grooved hardened bearings, and the camshaft and block having an oil groove, why wouldn't just polishing the cam down work?
in journal 1-4 i measure 1.7858 1.7856 1.7860 1.7860 on the new cam and 1.7855 1.7852 1.7854 1.7855 on the old cam