whats the max stock intake vacume of a 12a rotary?

thanks
Mick

 

What is maximum?? I see close to 30 inHg when I let off the gas above 6000 rpm. Is that the ansewer you were looking for??

Ryan

 

At idle? My stockport, stock intake/carb I get about 18-20 at idle.

 

I know you said 12A but the 13b I have shows about 20 vac at idle

 

by maximum i mean at redline so 6000rmp is good enough.. but i got no idea what inHg is


and rx7carl & mike-p thanks for the idel aswell. i asume thats 18-20 psi??

sorry im not to familia with vacume measurments..

 

Vacume is typically measure in inches of mecurey (inHg). It leymans terms it is how far up a tube (i forgot the diameter) mercury will be pulled at room temperature, if a vacume is introduce at the other side. Make sense??

At idle a good condition rotory engine will produce 18-19 inHg vacume. Excelent condition will be 19-20inHg.

Ryan

 

Yeah vacuum is the negative side of the spectrum. psi is the positive. At redline, Im getting into the HIGH 17 psi positive amount LOL

Positive is a good thing, hard on tires tho

 

what does fluctuating readings mean. I can only pull14 inHg. and that fluctuates from 12 to 14. The engine is hard starting and floods easy. I am thinking my compression went "poot" Based on vaccum alone, what should I look for?

 

More than likely a vacuum leak. Check vacuum lines, manifold gaskets, etc