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Old 10-25-2006, 07:17 PM
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Oil restrictors for roller rockers?

I'm building a 350 chevy for a boat. Its nothing too hot by car standards; 300 hp at 5000 rpm on vortec heads, 9:1, 202/213 cam on a 110 LSA.

One of the concerns when building a boat engine is oil control. Running at 4000+ rpm all day, it tends to push more oil out than can drain back. I'll probably use a windage screen and have cleaned up the drains in the valley.

For reasons of matching cam events to head flow, I'm going to run 1.6 rockers, and why not make them rollers to drop friction and the need for all that oil up top. Smart guy, huh?

So what about restrictors that limit upper end oiling and put that oil in the mains where it can do more good?... Is that what I need? what do I tell my machinist to do? Do I just ask for oil restrictors because of roller rockers? Opinions?

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Old 10-25-2006, 10:04 PM
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Quote:
Originally Posted by curtis73
I'm building a 350 chevy for a boat. Its nothing too hot by car standards; 300 hp at 5000 rpm on vortec heads, 9:1, 202/213 cam on a 110 LSA.

One of the concerns when building a boat engine is oil control. Running at 4000+ rpm all day, it tends to push more oil out than can drain back. I'll probably use a windage screen and have cleaned up the drains in the valley.

For reasons of matching cam events to head flow, I'm going to run 1.6 rockers, and why not make them rollers to drop friction and the need for all that oil up top. Smart guy, huh?

So what about restrictors that limit upper end oiling and put that oil in the mains where it can do more good?... Is that what I need? what do I tell my machinist to do? Do I just ask for oil restrictors because of roller rockers? Opinions?

Running a engine at 4000 plus RPM all day with 1.6 rockers I would think you would want oil there to cool the springs and your not talking about putting screens in the drain backs, I would just open them up so oil could return to the pan with out any restriction.

And if your using a hydraulic cam I would not use the restrictors either.

On the marine engines we have worked on we have used a standard volume oil pumps.
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Old 10-26-2006, 04:09 AM
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Oil restrictors for roller rockers?

One idea would be to drill the oil restrictors out as much as possible.I have done this on my solid roller big block and it seems to be working out OK.Enlarging the drain holes sounds like a good idea also,but I think I would stay away from windage tray/crank scraper in case you were considering using them.
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Old 10-26-2006, 10:04 AM
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I wouldn't recommend using restrictors. I would consider an oil pan with more capacity with a stock volume oil pump. I see no problem with using a windage tray, especially considering the probabilty of choppy water. Also, make sure the heads will work with the added lift of the 1.6 rockers.

tom
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Old 10-26-2006, 10:13 AM
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oil

I would also not run the restricters..

Try to concentrate on getting the oil back to the pan and also adding a larger capcity pan if you can fit it in...

keith
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Old 10-26-2006, 01:38 PM
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Ok, great. I'm sure I can fit a pan with kickouts, but space is limited for a deep sump. I have a 3-stage dry pump just kidding
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Old 10-26-2006, 01:41 PM
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Quote:
Originally Posted by machine shop tom
Also, make sure the heads will work with the added lift of the 1.6 rockers.
Thanks, ironically, the heads are modified for higher lift, but my net lift with this cam and 1.6 rockers will still only by .427/.438

So I have a yes windage tray and a no windage tray. Either of you care to elaborate on your recommendations?

How far can I go "enlarging" the drainback holes? What kind of paint should I use in the valley/heads? How do I prep so that the paint doesn't flake off in my engine?
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Old 10-26-2006, 02:02 PM
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Here´a thread
about painting the inside of your engine.
I was about to post this reply over at Hot Rod
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Old 10-26-2006, 02:21 PM
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To restrict top end oil should simply be a matter of changing the cam bearings out and drilling smaller holes 90 degrees out and installing them with the smaller holes over the oil passages?
Seen this done on Pontiacs since they have such a big crank, they need more oil on the bottom end, but it should work the same on other engines.
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Old 10-26-2006, 02:42 PM
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Quote:
Originally Posted by malc
Here´a thread
about painting the inside of your engine.
I was about to post this reply over at Hot Rod
Great link, thanks!!!
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Old 10-26-2006, 03:30 PM
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Quote:
Originally Posted by 428ho
To restrict top end oil should simply be a matter of changing the cam bearings out and drilling smaller holes 90 degrees out and installing them with the smaller holes over the oil passages?
Seen this done on Pontiacs since they have such a big crank, they need more oil on the bottom end, but it should work the same on other engines.
Restricting oil to the cam bearings on SBCs will not limit the oil to the top (rockers, etc.). Early Pontiacs were oiled through the cam bearings to the rocker arms via passages to and through the rocker arm studs. However, that system changed to the pushrod oiling system in the 1965.

tom
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Old 10-26-2006, 03:55 PM
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High jack alert...

Tom

On later Pontiacs is there a way to tap for a pipe plug and drill a smaller hole in it? Heard that done on Olds blocks before. Where would you find the correct passage on the Poncho?
On my RA V block I was also told to drill a small hole in a plug that meters oil to the distributor gear if I go to the bigger cam gear. Right now I run small gear cam.
Not that I want to, just trying to learn a few tricks.

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