Adriano

I honestly dont think you understand it, especially when you start talking about 30psi of vacuum, as relative to atmosphere 30 psi vacuum is impossible. BTW 200 psi on top of the ring is nowhere near the mark, think 10,000psi

You can fit a stagea motor to an r33 but not the other way aroung, as the sump wont bolt on

If you crank it after it dies, does teh handcontroller show rpm, sounds more like cas or igniter.

GT-RZ, i suggest you read up on how piston rings seal, i think it will alter your thinking on the subject.

Because you have a decat pipe, ther is no cat to spit out.

-15psi is the same as removing the atmospheric pressure to zero. Crankcase evacuation is usually only used on N/A when you have a set capacity etc to give you the horsepower edge, using a vac pump, -10psi relative to atmo is about the break point where it costs more horsepower to create the vacuum than you gain, however the gains are certainly not insignificant. In forced induction setups its cheaper to add 2psi to get the same gain.

Is it an alloy radiator, or a stocker with plastic tanks?

The piston rings are expanded by the difference between the combustion pressure and the crankcase pressure. by giving it vacuum, the rings expand harder against the walls, and blowby is reduced. I agree with the point of the pressure(or neg pressure as the point may be)on the bottom of the piston, but the pumping losses are assaciated with moving the gas under the piston back and forth as the piston moves. Reduced pressure reduced the mass of the gas. After reading this thread, i will be hooking my catchcan setup to a baffled breather in the block

There is no pump in the setup, only a venturi in the exhaust. Im running a true venturi in the intake, which should generate a fair vacuum. I think you are emphasising the oil pump creating a -ve pressure in the sump too much, as the volume of oil pumped relative to the volume of blowby makes it insignificant. By increasing the vacuum in the crankcase, ring sealing is actually improved, and parasitic losses by windage and piston pumping losses are reduced significantly. although oil pressure relative to atmasphere is reduced, The real oil pressure differential between the oil galleries and the crankcase(which is what really matters) is improves or remains constant. Most vacuum pump setups run about 10psi vacuum.

I would certainly try to get a bolt back in there. Its not a ocating bolt, it clamps the head down to stop a coolant oil leak from those 2 passages.

An interesting read on this topic, that generates -10psi crankcase vacuum can be found here http://www.v-eight.com/tech_forum/viewtopi...amp;t=238"]undefined[/url]

Please invest in some chain to chain the car down, sorry to be seeing you leave, although e85 will probably be a bit more available where you are going.

No, 1.25 isnt too bad, not the best though.

I guarantee they would be heaps stronger, there would be an extra 40kg in the block.

You can buy add on ba xr6/8 style bonnet bulges

Coolant temp sensors dont register overheating if there is no coolant.

yes

For the cost and frustration, it would be heaps easier to go rb30

Yep, carbon bonnets are heaps worse for fitment, and you cant slot the mounts in a gtr

Dont think he has datalogit, so he will have to do it manually.

Cummon yee, just buy the hx55 thats on there

motorsport connections($$$) or jnt performance do good prices

I think there was only one, just listed twice. Yeedogger bought it because you told him to

rb20 and series 1 rb25 cas are the same.

If you are getting the oil gallery welded up, then i would also weld a little more meat onto the front water gallery, as the gasket doesn't overlap it very much