entropy
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posted September 26, 2009 10:59 PM
oil pressure to the head
I learned something interesting today.
Andy had 2 oil pressure gauges on a Busa, one on the main oil galley, and another on the Busa's 2nd galley which feeds the head.
The 2nd galley maxed out at 42-ish psi, way under main galley pressure.
No easy way to measure the oil pressure to the head on a 12.
I'd never thought about what oil pressure in the head was, just assumed it was same as the main galley.
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KZScott
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posted September 27, 2009 04:53 PM
ive heard tell of guys restricting flow to the head.... but with big cams and stiff springs... would you really want lower psi?
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01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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entropy
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posted September 28, 2009 04:21 AM
quote:
ive heard tell of guys restricting flow to the head.... but with big cams and stiff springs... would you really want lower psi?
Scott,
i sure don't want to lower oil pressure to the head.
I was just happy to learn that the pressure to the head and the pressure to the bearings is not the same. new knowledge is a good thing 
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Y2KZX12R
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posted September 28, 2009 04:21 AM
 Edited By: Y2KZX12R on 28 Sep 2009 12:24
Typically in a race engine of domestic V8 type, you restrict the volume of oil to the top end.
Roller rockers don't build up but a small fraction of the heat at high rpm that a stock ball type rocker does. So without the heat, they need very little oil. This also keeps more oil in the pan.
It would be interesting to see what volume of oil the engineers decided to send up to the top end. That would be a good experiment Karl.
These engines don't need a whole hell of a lot of oil up top. The oil delivery to the top end has been set by an orifice in the passage way up to the head or just the size of the passageway itself will do it. But they do need pressure to keep the cams "floating", something that a pushrod engine doesn't need to do.
Cam lobes are protected by the additives in the oil not the oils base stock. Phosphorous, Zinc, Molybdenum, etc. are what protect the hard contact points in an engine. These content levels or the "additive package" is what really matters when selecting an engine oil.
If you are running an oil that has an API "sun" on the bottle then its designed to be run in engines with a catalyst in the exhaust system and it cant protect the top end like a good off road racing oil.
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entropy
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posted September 28, 2009 08:15 AM
great info, Jim.
yet again another example of stuff you know, and i didn't
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dougmeyer
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posted September 28, 2009 12:53 PM
I cut the oil to the head in a ZX-11 by 30% with no negative effects, probably could have gone more. This was because of the poor drain back rate in a left turning car application. Later, I improved the drainback with external oil lines, but left the restrictor in place. No problema.
Like Jim says, one of the standard things you do in "race prepping" many car blocks is to restrict the oil to the head.
To expand on what Jim says, the oil flow is really not there so much for lubrication but to cool the springs which generate a LOT of heat.
Doug
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brendasue555
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posted September 28, 2009 03:23 PM
Yippie, new knowledge is as good as new fun in my world and the best thing I learned besides the different psi, is the additives being the real protector and the oil being the coolant. I am getting so smart. Forking and lubricating the head................what great knowledge!
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KZScott
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posted September 28, 2009 03:26 PM
quote:
. Forking and lubricating the head................what great knowledge!
something all women need to understand! 
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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Y2KZX12R
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posted September 28, 2009 05:57 PM
quote:
quote:
. Forking and lubricating the head................what great knowledge!
something all women need to understand!
lol  no comment.
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Y2KZX12R
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posted September 28, 2009 06:12 PM
quote:
To expand on what Jim says, the oil flow is really not there so much for lubrication but to cool the springs which generate a LOT of heat.
Doug
Good point Doug on the springs, yep they need oil for cooling as well.
Now here's more food for thought, the cup engines keep the valve covers full of oil. Yep, the springs and rockers are under oil. Quite the opposite of what we are talking about.
But these engines are designed to run that way and they have 6 gallons of oil in the system total. They typically evaporate/burn 2 gallons of that oil or more in a race. The oil not only cools but it dampens harmonics. I'm sure its a power or durability secret learned on the spintron at the cup shops. There running thinner and thinner valve stems. Some are as thin as 6mm. It doesn't sound thin compared to these bike valve stems but remember these intake valves are 2.180" with 6mm stems. Almost like the umbrella in your drink.
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brendasue555
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posted September 29, 2009 11:57 AM
are umbella girls in your drink too?
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KZScott
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posted September 29, 2009 12:58 PM
thats really interesting 
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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Y2KZX12R
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posted September 30, 2009 04:07 AM
Edited By: Y2KZX12R on 30 Sep 2009 12:20
quote:
are umbella girls in your drink too?
Nope, they just help drink.
Here they are hard at work...
3hp is a lot for an umbrella girl to keep control of. Although I think Brenda can handle the torque of this blender.
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entropy
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posted September 30, 2009 11:45 AM
baby in red shorts got some back, yes she does!!!
What in the world is this lil dry-docked "ship" doing serving drinks in someone's back yard???????
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KZScott
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posted September 30, 2009 01:17 PM
that IS "sofa king awesome"
____________
01 ZX-12R 8.84 @ 156.3 no bars, DOT tires. Pump Gas, NA.... turbo 8.47 @ 164.
00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
00 ZX-12R street turbo 1: 227.9 1.5: 234.1 Loring AFB
00 ZX-12R LSR turbo 1: 263.1 1.5: 266.5 Loring AFB Worlds fastest ZX-12R
CMG Racing RCC Turbos
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Y2KZX12R
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posted October 02, 2009 02:55 AM
quote:
baby in red shorts got some back, yes she does!!!
What in the world is this lil dry-docked "ship" doing serving drinks in someones back yard???????
Well, its a friends little cottage on a Lake in Wolcott Ct. It faces out over the lake. He kept saying he wanted to make a bar from a boat. So one day another friend found this ski boat in the paper for $200 no engine and a broken Kiel. So its days as a ski boat were over and they brought it home and started at it with the chainsaw. A week later it was a bar with nice cabinets and built in coolers. It was christened 7/4/09.
Karl, did you see the blender? It will make quick time of LARGE batches of margaritas at 3/4 throttle. Its nicknamed "the beast". Its perfect for middle of the lake blender drinks.
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entropy
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posted October 02, 2009 08:15 PM
that blender has a chain saw motor???
(like my ex-wife's dildo)
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Y2KZX12R
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posted October 05, 2009 12:08 PM
yep, well a weed wacker engine actually.
It doesnt have a problem grinding ice.
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