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| rear cam journal modification for oil flow https://slantsix.org/forum/viewtopic.php?t=56622 |
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| Author: | Junior [ Wed Nov 26, 2014 5:21 am ] |
| Post subject: | rear cam journal modification for oil flow |
anyone have the thread for modifiying the rear cam journal for oil flow? i have been searching and am coming up with a crazy amount of threads for cams but cant seem to find the one im looking for. |
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| Author: | slantzilla [ Wed Nov 26, 2014 7:38 am ] |
| Post subject: | |
AFAIK, you just grind a groove all the way around the journal in line with the oil hole through the journal. |
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| Author: | Charrlie_S [ Wed Nov 26, 2014 2:17 pm ] |
| Post subject: | |
I do it "down and dirty". Just take a die grinder, with a cutoff wheel, Set the cam on a couple of wood "V" blocks. Hold the cutoff wheel in the middle of the rear journal, and rotate the cam. Looks like it was done by a drunken sailor, but it works. Probably only about .010 deep, but I never measured. |
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| Author: | DusterIdiot [ Wed Nov 26, 2014 5:26 pm ] |
| Post subject: | Yeah... |
I would limit the groove to a minimal cut say no deeper than a 32nd of an inch, I have done two mech cams on hyd cam blanks with the groove in the rear journal...even with a restrictor at the top of the oiling hole in the block it over oils...enough to say that I had to modify the valve cover with a sheet metal curl to the inside of the passenger side lower edge of the cover and build up an RTV bead there...if not, the amount of oil will innundate the valve cover seal and you will have a leak if the rear is not higher than the front of the car...you'll get better draining on the drool tube head, but the #6 plug tube and seal will get a really good bath during run time. |
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| Author: | Exner Geek [ Thu Nov 27, 2014 6:19 am ] |
| Post subject: | |
It isn't only leakage that is the problem, too much oil to the top with a mechanical cam can inundate the valve seals and permit excess oil to go down the valve stem. Nasty deposits in the combustion chamber and back of the valve result. If you are running a mechanical cam and the holes in the cam journal and the rear cam bearing line up properly you will get plenty of oil for proper operation. Hydraulic lifter cams require much more oil flow and should be ground on the blanks with the groove around the rear journal. |
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