engine builder says gear drine
#21
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Originally Posted by BillK
Reed,
If that is indeed true, which it seems it would be, then it is actually better for the camshaft bearing oiling. Having the cam pushed upwards would let the oil get out of the oil hole and allow the bearing to "draw" the oil around it as it turns, creating a hydrostatic wedge of oil for the camshaft to run on. This is really how bearings are supposed to work. In reality though, I doubt that the force of the gears would counteract the force of the valve train pushing down on the camshaft.
The oil port is not on the bottom because of the load from the chain. It just so happens that is how the big block is designed. If you look at a small block the oil hole in the bearing is at about 2 oclock and it works fine.
If that is indeed true, which it seems it would be, then it is actually better for the camshaft bearing oiling. Having the cam pushed upwards would let the oil get out of the oil hole and allow the bearing to "draw" the oil around it as it turns, creating a hydrostatic wedge of oil for the camshaft to run on. This is really how bearings are supposed to work. In reality though, I doubt that the force of the gears would counteract the force of the valve train pushing down on the camshaft.
The oil port is not on the bottom because of the load from the chain. It just so happens that is how the big block is designed. If you look at a small block the oil hole in the bearing is at about 2 oclock and it works fine.
#23
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Originally Posted by GPM
.772, Crower 68848 spring.
![EEK!](/forums/images/smilies/eek.gif)
![EEK!](/forums/images/smilies/eek.gif)
I like the Crower vasco's run them in the race cars,I just had to make sure ya had some temp in them
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#24
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Originally Posted by Reed Jensen
Under ideal conditions it really doesn't matter where the oil hole is if there is enough pressure to create a film the cam runs on... I'll post a picture of a BBC cam bearing that didn't have enough oil flow... oh... by the way.... when I showed the damaged cam bearing to the builder... he said " that's normal"..
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#25
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Originally Posted by GPM
.772, Crower 68848 spring.
Just curios since I ran a .774 last yr, but very few hrs.
Thanks Michae.
#26
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I ran a comp 948 spring (~340 seat, ~1000 open) on old motor with .772" lift...soft lobe cam...first set of lifters lived 45hrs, springs were ready for change then also. Next cam was ~.785" lift, but with aggressive ramps...broke a lifter @6hrs...so the ramp speeds really affect things. My personal advise is to keep lift around .730" or less and use soft ramps...but there are lots of variables.
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Maybe I'm missing something, but why not just use an igniton system that uses a crank sensor to achive precise ignition timing? Or it is cam timing that the builder is concerned about?
Dave
Dave
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Originally Posted by Dave_N
Maybe I'm missing something, but why not just use an igniton system that uses a crank sensor to achive precise ignition timing? Or it is cam timing that the builder is concerned about?
Dave
Dave
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Originally Posted by Panther
Gears are the cheap way to fool your friends into thinking you have a blower under hood cause of the gear whine!
No joke, I know a guy who did it on his hotrod just so he could have the gear whine...![I'm With Stupid](/forums/images/smilies/imwithsupid.gif)
![EEK!](/forums/images/smilies/eek.gif)
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No joke, I know a guy who did it on his hotrod just so he could have the gear whine...
![I'm With Stupid](/forums/images/smilies/imwithsupid.gif)
This is not the reason at all........if i was going with a junk pete jackson maybe................