IC inlet O-ring size?

[Brett Dikeman]

At 12:27 AM +0000 7/26/02, Jobe Tichy wrote:
>Brett--does your device pressurize only the turbo hoses through the
>intercooler and to the throttle body?  Or, does it actually
>pressurize past the throttle body and into the valve train and crank
>case?  Just curious because I was thinking that the throttle wing
>would remain closed and would thus only pressurize up until that
>point--which is all I need to do to find a hose leak.  I wonder if
>it would cause damage going beyond that because a leak down test
>would be similar and probably needs some special equipment or
>experience (I think).

Leakdown tests do involve a special rig(not THAT special, really) and
a little know-how.

My homemade plug just pressurizes the entire intake system...it also
ends up pressurizing the crankcase too, which is why you should watch
for the dipstick shooting out(this happened to me once, when I had
too small an o-ring on it.)

Pressurizing the entire system is by far the quickest, safest, and
easiest way to find boost leaks.  Uh, yeah, I think I'll wander
around the engine compartment with a unlit propane torch.  Uh, NOT.

Especially when used with one of those portable air tanks, you can
-instantly- tell, simply by listening, where leaks are and how bad
they are.


>Also, why did you say only 10 psi or so when pressurizing.  Is that
>because you don't want to exceed the 1.8 bar that is typically
>pressurized on the stock set up?

Yes- the ECU pressure sensor could be damaged otherwise.  I would
have said 14psi, except that leaves no margin for error; 2bar is the
max rated pressure for that sensor.


Brett
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