The reason you MUST do a "boost leak test"!! Don't pass go. Read this.
Evolving Member
Joined: Aug 2003
Posts: 107
Likes: 0
From: Long Island N.Y.
Originally Posted by mitsuorder
Yes, if the motor is cold you will get blow by past the rings. Do the test with a warm motor while everything is still seated up.
I finally did a boost leak test on my EVO today and found NO LEAKS!!!!
I looked around, listened, felt around all the connections/piping with my hands and ears and everything was kosher, even with 20 psi going thru the system.
well, my MBC vacuum line had a small leak since I didnt zip tie it, so I double zip tied it ha ha
I looked around, listened, felt around all the connections/piping with my hands and ears and everything was kosher, even with 20 psi going thru the system.
well, my MBC vacuum line had a small leak since I didnt zip tie it, so I double zip tied it ha ha
Last edited by Blue Evo 8; Nov 11, 2006 at 05:08 PM.
Newbie
Joined: Dec 2005
Posts: 75
Likes: 0
From: Nation of the apes
maybe this will be a dumb question but here it goes.
Doing the boost leak test, you only have to connect the hose with the valve steam to the turbo inlet and pressurize the system including the intake manifold, isnt it??
if valves at any cylinders in the engine are in overlap, wouldn't pressure drop because of this???
Thanks, and dont flame me.
BTW:
here yo go
Boost leak test
Doing the boost leak test, you only have to connect the hose with the valve steam to the turbo inlet and pressurize the system including the intake manifold, isnt it??
if valves at any cylinders in the engine are in overlap, wouldn't pressure drop because of this???
Thanks, and dont flame me.
BTW:
Could someone show me how to do a leak test? Is there a how to somewhere for the Evo?
Boost leak test
Last edited by got boost??; Nov 11, 2006 at 06:23 PM.
A valid question. 
The motor likes to stop in certain spots, due to valve spring tension. You'll notice this if you've ever rotated a motor by hand. In countless boost leaks tests on this car and the DSMs, I've never had one stop in overlap.
The motor likes to stop in certain spots, due to valve spring tension. You'll notice this if you've ever rotated a motor by hand. In countless boost leaks tests on this car and the DSMs, I've never had one stop in overlap.
Newbie
Joined: Dec 2005
Posts: 75
Likes: 0
From: Nation of the apes
Originally Posted by kjewer1
A valid question. The motor likes to stop in certain spots, due to valve spring tension. You'll notice this if you've ever rotated a motor by hand. In countless boost leaks tests on this car and the DSMs, I've never had one stop in overlap.
The motor likes to stop in certain spots, due to valve spring tension. You'll notice this if you've ever rotated a motor by hand. In countless boost leaks tests on this car and the DSMs, I've never had one stop in overlap.Thanks a lot.
Last edited by got boost??; Nov 11, 2006 at 07:09 PM.
Originally Posted by SLVRNBLK
Should be tested up to 30psi.
It's odd to me that a 6 psi drop in boost pressure on the dyno graph wasn't a sign it had something wrong with it.
It's 4 hours from Indy to Ohio and 6 psi drop would have been detected, checked and fixed.
To each their own.
It's 4 hours from Indy to Ohio and 6 psi drop would have been detected, checked and fixed.
To each their own.
Last edited by David Buschur; Nov 13, 2006 at 07:36 AM.