marc wiese wrote:

The thermo pellet is there for USA emissions-enables heating up the oil
quicker. Emissions are also why the rx7s also have very high idle on
startup as well, in fact all three systems-ACV, AWS, EGR are for that.
. That is all.

Jets are from the carb makers (Holley), or from Mazdatrix or Haynes or
Racing Beat. They all sell em. Or you can make em yourself.
Let's all ask Bruce to hurry up the 20B tape, his other one was great.
Marc

 If you make a jet yourself, what diameter orifice would you use?

Chuck Dunlap

2 mm according to the Racing Beat Technical Manual and catalog on page 42
Chuck.

Paul Lamar

Thanks, Paul.
The reason I asked is that is what I did on my engine. I used a #47 drill to
make the jets.
My oil pressure is now lower than without the mod, about 45PSI at any RPM
above 2000, while before the mod it ran closer to 60PSI. At idle, when the
oil is hot, it runs much lower, about 15 PSI. I was wondering if that is
normal for this mod. I did check the oil pump and first pressure regulator
by blocking off the oil inlet to the rear housing and while cranking got
~90PSI, which is normal. Maybe the second regulator is bypassing too much,
but I suspect that the jet mod lowered my oil pressure. Has anyone else
tried this mod with different results?

Chuck Dunlap

Interesting. It should only affect it at low RPM. At high RPM centrifugal
load on the spring loaded ball valve in the e-shaft rotor cooling squirter
causes it to open. It looks like, from the curves in the book, the
ball valve is fully open at 3000 RPM.

What is the diameter of a #47 drill Chuck?
2 mm is .0787 inch. Perhaps a #47 is too large.

Paul Lamar

#47 drill is 0.0785 which is close enough.
Roger Robertson

 
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