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| Block oil mods? https://slantsix.org/forum/viewtopic.php?t=58728 |
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| Author: | Badvert65 [ Mon Nov 23, 2015 4:28 pm ] |
| Post subject: | Block oil mods? |
Read the article about block mods for racing. There is a section describing drilling 1/2 inch holes between the lifter bores and installing 'stand-offs' to aid in lifter oiling. Where can someone get these stand-offs and how tall are they? |
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| Author: | Greg Ondayko [ Mon Nov 23, 2015 5:06 pm ] |
| Post subject: | |
When my machine shop does this process he uses valve guides and they are about 1/2 high .... eyeball measurement. I'm sure doc Will chime in. Greg |
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| Author: | CNC-Dude [ Tue Nov 24, 2015 6:24 am ] |
| Post subject: | Re: Block oil mods? |
Quote: Read the article about block mods for racing. There is a section describing drilling 1/2 inch holes between the lifter bores and installing 'stand-offs' to aid in lifter oiling. Where can someone get these stand-offs and how tall are they?
We used these in hundreds of circle track engines and we just used short brass pipe nipples.
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| Author: | Doctor Dodge [ Tue Nov 24, 2015 9:18 am ] |
| Post subject: | |
The main goal with this mod is to get more oil around each lifter so more oil drops down around the lifter & onto the cam / lifter surface, for better lubrication / cooling at the lifter to cam interface point. Drilling the extra holes just helps crankcase ventilation. You can use whatever... to make the stand-offs but these days, I don't use stand-offs much. Instead, I have a large multi-flute 1 inch diameter countersink, with a long shank and I use that to put a large 45 degree countersunk "ring" around the top of each lifter bore. The added recesses catch and directs more oil thru all the lifter bores. Note: I always have to re-ream & hone out each lifter bore, after countersinking, to remove the burr the countersink creates. ( you want to hone the bores anyway, just to be sure they are smooth and have the proper oil clearance... just be sure do it after the countersinking operation) DD |
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| Author: | Badvert65 [ Tue Nov 24, 2015 11:55 am ] |
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OK. That pretty much answers my question. I honestly didn't see the need for the stand offs since the engine has a 30* tilt. Thanks. |
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| Author: | DusterIdiot [ Tue Nov 24, 2015 4:29 pm ] |
| Post subject: | If... |
If you need more oil directly to the face of the cam shaft lobe, you can use a tool like comp cam has, that will score a line when drawn up the lifter bore allowing a dribble of oil on the face... |
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| Author: | Greg Ondayko [ Wed Nov 25, 2015 5:39 am ] |
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I hone the lifter bores quite a bit on the race engine. No problems. I have not done the countersink trick, but It's a good idea and will be doing it on future builds. Greg |
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| Author: | emsvitil [ Wed Nov 25, 2015 2:34 pm ] |
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How much do you countersink it? |
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| Author: | Doctor Dodge [ Thu Nov 26, 2015 7:31 am ] |
| Post subject: | |
I shoot for .060 with a 45 degree c-sink. (90 degree "included" angle) The factory already did a rough countersink so some of the bores are easy to "touch-up" but others take a bigger cut and more work. DD |
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