Hey guys, can someone just give me a basic rundown on what the symptoms/consequences of bent valves? I know the basics but I just want to confirm my problem. Mainly, what kind of compression have people gotten with bent valves? Also, what did results of a leakdown test reveal? Obviously I'm gonna have to reubuild or replace my heads if this is the case. Thanks in advance for the help.
1994 Mariana Blue Pearl Mitsubishi 3000GT VR-4
DR-650s and supporting, PST CFDS, Volk GT-Cs, Tein Flex, among other things 9 BRG Awards (inc. '07 Best AWD, '08 People's choice , '11 Total Package, '12 Best In Show, '13 Best 3000GT)
1st Place NG11 - 3rd Place NG07 - Feb 06 3SI ROTM - Other ROTMs - 3/S Calender appearances 2010 Space Gray E90 335i M Sport 6MT - JB4
2008 Wicked White Evolution X GSR
2002 Jet Black E53 X5 4.4i AWD
Bring it up to TDC for that cylinder which is effected and pressurize it wih air. If you hear noise coming out the air cleaner it's intake. If you hear it coming out the exhaust it's your exhaust valve. If you run around with an exhaust valve leak you'll probably burn a valve. If you run around with an intake valve leak you will reek havoc on the intake track as the pressurized air is pushed back out when the piston comes up to on the compression stroke.
bent valves will happen if all 12 intakes go bye bye. you will get 0 compression even with the leak down test. here is how you see it for sure (see) remove teh intake plenum and the lower plenum and you should be able to see the bent valves. some how the gaps on top of the piston in the intake side is not deep enough and they spank the intake valves when timing jumps. exaust are fine. also you might be thinking if you ddamaged the piston tops.....well lucky you they are fine but you can see where the valves hit them. thank god to all the valves being made soft enough to bent on contact with the pistons. hopefully it helps
The AutoGuide.com network consists of the largest network of enthusiast-owned enthusiast-operated automotive communities.
AutoGuide.com provides the latest car reviews, auto show coverage, new car prices, and automotive news. The AutoGuide network operates more than 100 automotive forums where our users consult peers for shopping information and advice, and share opinions as a community.