Grumpyvette: I have purchase a set of 818-16 CompCams Solid Roller Lifters. There are two oil holes in the lifter. One is for the roller bearings on the roller shaft and the other is to route oil to the pushrod. Please look at CompCams page 242 at the Endurex lifters which part number 818-16 is, and note the upper oil hole is Perpendicular to the Oil Gallery and does not appear to have a path for oil to get to it and to the pushrods. Go to Isky Cams Web Site and look at the Red Zone solid roller lifters on the home page under featured products and note the same oil hole with a black spot between it and the lower oil bypass portion of the lifter. That looks to be a milled or ground out groove for oil to get to the upper lifter oil hole and then to the pushrod.
Please study this carefully and see if you can come up with a logical path for the oil to get to the lifter upper oil hole. Called CompCams, asked the question and got A LOT OF SILENCE.
standard comp endurex roller lifter
http://www.compperformancegroupstor...ore_Code=CC&Product_Code=823-1&Category_Code=
the comp tech guys have consistently made me crazy over the years, (not knowing some answers or knowing their product line)the oil hole is low enough to allow oil to feed the push rod on the cams base circle, if you measure the distance the oil hole is from the roller wheel surface, on the cam you'll see the distances are slightly different between the brands, then measure a lifter bore and that oil passage, diameter to the cams base circle you'll see it gets oil into the lifter feed hole on the cams base circle. and the holes sealed by the lifter rising in its lifter bore on the cam lobe, during rotation, but yes I think the isky design is superior, but the comp lifters should work ok.
http://www.iskycams.com/pdf/5-ISKYCatalog2009f_01Master Catalog2004 (Page 24).pdf
Grumpyvette: Just went out to the SBC Block and measured several dimensions. This is a later model factory roller block. From the top of the lifter boss to the base circle of the cam (LT-4 Hot Cam) is 2.375. The base circle measures 1.187"/2 = .5935". 2.375" (top of lifter boss to base circle) + .5935 (Radius of base circle) = 2.9685". Top of lifter boss to top of Oil Galley = .906". Top of lifter boss to bottom of Oil Galley = 1.406". Oil Galley = 1.405 - .906 = .5". 2.9685 - .5935 (base circle Radius) = 2.375". 2.375 - 1.406 (Bottom of Oil Galley to Top of Lifter Boss) = .969" which is from base circle of cam to bottom of Oil Galley. Then .969" + .5 (for Galley Dia) = 1.469 base circle to top of Oil Galley. CompCams 818 solid roller lifter center of top oil hole to push rod is 1 15/32 which is 1.468.
So when the 818 solid roller lifter is on the base circle. OIL will reach the oil hole in the lifter for the push rod. This Oil hole in the lifter is 3/32 in diameter. Now I am satisfied that Oil will get to the pushrods!
see dial indicators DO HAVE USES!!!
always glad to help!
BTW
http://www.compcams.com/Products/335-353.PDF
I usually groove my lifter bores slightly to allow the oil to flow/spray just a bit more flow volume to the lifter base/cam lobe and theres no reason you can,t do something similar to the lifter bore wall above the oil passage for about .200" to allow oil to feed the lifter in greater volume , or to bevel the oil feed hole slightly in the lifter body if its helps in your application.
CAREFULLY verifying measurements, like you did rather than trusting in luck,and doing little mods like that, if well thought thru, and carefully done are the difference between building engines, correctly for durability, and just assembling components, ID bet 80% of the guys assembling engines NEVER bother to check things like that you just did and as a result they will have (UN-EXPLAINED) problems YOU will have avoided/prevented
Please study this carefully and see if you can come up with a logical path for the oil to get to the lifter upper oil hole. Called CompCams, asked the question and got A LOT OF SILENCE.
standard comp endurex roller lifter
http://www.compperformancegroupstor...ore_Code=CC&Product_Code=823-1&Category_Code=
the comp tech guys have consistently made me crazy over the years, (not knowing some answers or knowing their product line)the oil hole is low enough to allow oil to feed the push rod on the cams base circle, if you measure the distance the oil hole is from the roller wheel surface, on the cam you'll see the distances are slightly different between the brands, then measure a lifter bore and that oil passage, diameter to the cams base circle you'll see it gets oil into the lifter feed hole on the cams base circle. and the holes sealed by the lifter rising in its lifter bore on the cam lobe, during rotation, but yes I think the isky design is superior, but the comp lifters should work ok.
http://www.iskycams.com/pdf/5-ISKYCatalog2009f_01Master Catalog2004 (Page 24).pdf
Grumpyvette: Just went out to the SBC Block and measured several dimensions. This is a later model factory roller block. From the top of the lifter boss to the base circle of the cam (LT-4 Hot Cam) is 2.375. The base circle measures 1.187"/2 = .5935". 2.375" (top of lifter boss to base circle) + .5935 (Radius of base circle) = 2.9685". Top of lifter boss to top of Oil Galley = .906". Top of lifter boss to bottom of Oil Galley = 1.406". Oil Galley = 1.405 - .906 = .5". 2.9685 - .5935 (base circle Radius) = 2.375". 2.375 - 1.406 (Bottom of Oil Galley to Top of Lifter Boss) = .969" which is from base circle of cam to bottom of Oil Galley. Then .969" + .5 (for Galley Dia) = 1.469 base circle to top of Oil Galley. CompCams 818 solid roller lifter center of top oil hole to push rod is 1 15/32 which is 1.468.
So when the 818 solid roller lifter is on the base circle. OIL will reach the oil hole in the lifter for the push rod. This Oil hole in the lifter is 3/32 in diameter. Now I am satisfied that Oil will get to the pushrods!
see dial indicators DO HAVE USES!!!
always glad to help!
BTW
http://www.compcams.com/Products/335-353.PDF
I usually groove my lifter bores slightly to allow the oil to flow/spray just a bit more flow volume to the lifter base/cam lobe and theres no reason you can,t do something similar to the lifter bore wall above the oil passage for about .200" to allow oil to feed the lifter in greater volume , or to bevel the oil feed hole slightly in the lifter body if its helps in your application.
CAREFULLY verifying measurements, like you did rather than trusting in luck,and doing little mods like that, if well thought thru, and carefully done are the difference between building engines, correctly for durability, and just assembling components, ID bet 80% of the guys assembling engines NEVER bother to check things like that you just did and as a result they will have (UN-EXPLAINED) problems YOU will have avoided/prevented