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Turbine

By Turbine,
in Engines & Forced Induction

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Turbine Collaborator

Turbine

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Posted

Hi Roy, for controlling boost the valve is actually a phneumatically actuated - electrically controlled rotating spoon valve 3" in diameter. Was primarily used as a shutoff valve on the Hornet for engine bleed air.

It has provision for position sensing and can be locked into any open position electrically. It has a light spring load bias in the closed position and uses differential air pressure on both sides of a diaphram to control the movement of the valve. It's very sensitive to pressure changes. I've got pictures of it, just got to find a spare moment to post them up in my gallery.

Oh yeh I thought about the comment I made about Fuel. The C16 we will use for comparison sake, just to show what it really does for your engine. We're just going to run it on optimax pump fuel. This way other people with RB20's will at least be able to correlate modifications and tuning on standard fuel.

MattSR Community Regular

MattSR

Posted
Posted

"Hi Roy, for controlling boost the valve is actually a phneumatically actuated - electrically controlled rotating spoon valve 3" in diameter. Was primarily used as a shutoff valve on the Hornet for engine bleed air.

It has provision for position sensing and can be locked into any open position electrically. It has a light spring load bias in the closed position and uses differential air pressure on both sides of a diaphram to control the movement of the valve. It's very sensitive to pressure changes. I've got pictures of it, just got to find a spare moment to post them up in my gallery."

Sounds like the worlds most sexual wastegate to me :D;)

  • 6 months later...
Turbine Collaborator

Turbine

Posted
  • Author
Posted

Hi guys,

I'm at the moment attempting to instal a set of RB26DETT camshafts into my RB20DET.

Everything is fine with the cams themselves fitting into the head, cam brackets fit nice and torque up well with no binding. The problem starts with the lifters.

Now I know I can run with the hydraulic lifters. We tried this on our R32GTS4, the engine ran quite well above 2200RPM. It had idle issues but we kind of knew that would happen. We removed them and put the standard cams back in so we could drive the car to the last Skylines show in town.

I thought with the hydraulic lifters in our race car it was a bit of a no no, mainly for the high RPM operation. So i got hold of a set of solid lifters (RB26DETT). For some reason, even if i installed them into the head above the valve springs, it looks like they will not make up the distance to the base circle of the cam lobes.

Will this be fixed with the shims between the valve and lifter??

Seems like alot of room to make up their, maybe up to 1inch :(

Maybe someone can shed some light on this subject for me.

Cheers

Turbine

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