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How long should a pressurized intake hold pressure?

T

tweeder

New member
I have found a few leaks by pressurizing the intake through an adapter on the throttle body. I have also,done the carb cleaner trick as well. I have really bad hearing so it's hard to pinpoint where a leak is coming from. I've had leaks from the maf, iac, upper intake under the supercharger, octopus on the top and an injector o ring. I just found a leak in the coolant loop thingy under the throttle body and sealed that up. Now if I pressurize the intake upto 20 psi it takes about 20-30 seconds for it to bleed down, no some or all might be coming from my contraption itself. The last 10 psi takes the longest to bleed. Does that sound acceptable?
 


You shouldnt be able to pressurize the intake... there is a fresh air draw for the crankcase in the throttle body.

If you took the tike to block that then technicallly you can let it sit for a bit while it bleeds through the pcv valve and piston rings.
 
I have a cap with a one way air valve like on your tire, and it's clamped to a silicone coupler and that's clamped to the throttlebody. Then I plug the lined at the octopus thingy, and the port off the throttlebody that goes to the,purge solenoid. I have no boost bypass or egr so no leaks from there. I have a vacuum guage at one port at the octopus, and I add air through the throttlebody and watch the guage and spray soapy water all over and look of bubbles. I have done this numerous times on this motor as well as others. Sometimes I can't access certain parts of the engine as with carb cleaner it has to be upright, so a spray bottle gets the solution there.
 
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