How long will it take to deflate the balloon leak down ?
How many MPH?
Just hand crank to TDC on compression.
If it were mine, not long. I have good compression but on compression with the plugs in I can hear the air leak past the pistons.
I really don't understand what the leak down test proves. If the pistons are cam ground and you have .003 clearance on the thrust sides doesn't that mean there is more clearance on the other sides? The top of pistons around the rings, is smaller then the rest of the piston and there are gaps in the rings, how does the air stay in?
Interesting thread. This is what I found at Wikipedia (and what you explained to me before):
Thank you for the post,
I just ordered one from Harbor Freight.
the real thing that is
80 psi is standard for aircraft engines where TDC is easily controlled by moving the propeller slightly. You don't have that control in a car engine, so I found that 20psi is better, as it won't spin the engine and all its accessories when it is a little off TDC.
Got it. Didn't think about the valves or bubbles in the radiator.
That Yellow balloon reminds me of those toy cars that you inflated the balloon and the ran across the floor on jet power.