IJ.;1136837 said:
from a fluid mechanics standpoint, this is incorrect.
a large diameter system containing a restriction of given size will generally flow more than a system with a diameter the same size as the restriction
spark plug reading *PICS*
- Thread starter grimreaper
- Start date
from a fluid mechanics standpoint, this is incorrect.
a large diameter system containing a restriction of given size will generally flow more than a system with a diameter the same size as the restriction
adampecush;1138278 said:
no.
If the systems restriction causes the flow to come close to its mach number than the system restriction will be at it's highest since no amount of additional flow will cause the fluid to go supersonic within the system making IJ statement valid.
figgie;1138288 said:
that's the condition the "generally" was referring to.
however, in the case of something like an exhaust system, a 3" with a 2" restriction will flow more than a straight 2" system. I imagine the same is the case for the PCV as I can't see that air moving all that fast.
Ummm it was a "rule of thumb" there are ALWAYS exceptions though.
In this case the "restriction" is at the start of the circuit so is THE restriction
The other point that needs to be made is when reading plugs you need to take into account ANY not WOT time as this will affect the plug colour.
To be 100% accurate it needs to be done as a plug chop ie: Drive WOT shut the motor off roll to a stop pull the plugs and read them, very hard to do with our engines though.
In this case the "restriction" is at the start of the circuit so is THE restriction
The other point that needs to be made is when reading plugs you need to take into account ANY not WOT time as this will affect the plug colour.
To be 100% accurate it needs to be done as a plug chop ie: Drive WOT shut the motor off roll to a stop pull the plugs and read them, very hard to do with our engines though.