ardasaliah Posted June 14, 2005 Share Posted June 14, 2005 http://www.twinturbo.net/net/viewmsg.aspx?forum=technical&msg_id=902104 Would something like this work for the supra? Link to comment Share on other sites More sharing options...
chris aka fonz Posted June 14, 2005 Share Posted June 14, 2005 Leak detector fluid from any plumbers merchant works well too Link to comment Share on other sites More sharing options...
JohnA Posted June 14, 2005 Share Posted June 14, 2005 It's sort of a leakdown test for the intake. However, the throttle plates are not meant to be airtight, and the idle control valve could be open, couldn't it? I doubt that it's worth setting up this gizmo at all. Small leaks can be caught just by looking at the boost gauge. If you only see 10mm Hg vacuum on hot idle, you know you've got a leak, don't you? Link to comment Share on other sites More sharing options...
adi2009 Posted June 14, 2005 Share Posted June 14, 2005 Small leaks can be caught just by looking at the boost gauge. you mean BIG leaks. Link to comment Share on other sites More sharing options...
ardasaliah Posted June 14, 2005 Author Share Posted June 14, 2005 10mm Hg -whats that in PSI or BAR Link to comment Share on other sites More sharing options...
JohnA Posted June 14, 2005 Share Posted June 14, 2005 10mm Hg -whats that in PSI or BAR It's about a third of a bar. Vacuum in boost gauges is denoted in mmHg usually, not psi (so when people refer to '20psi' vacuum it is obvious that they are fresh ) you mean BIG leaks. I mean small leaks --- big ones you can hear or feel! Link to comment Share on other sites More sharing options...
merckx Posted June 14, 2005 Share Posted June 14, 2005 10mm Hg -whats that in PSI or BAR 10mm Hg = 0.0133 bar 1 bar = 14.5psi 10mm Hg = 0.193psi Link to comment Share on other sites More sharing options...
Soonto_HAS_soop Posted June 14, 2005 Share Posted June 14, 2005 It's about a third of a bar. Vacuum in boost gauges is denoted in mmHg usually, not psi (so when people refer to '20psi' vacuum it is obvious that they are fresh ) I mean small leaks --- big ones you can hear or feel! I think the idea that the 300 owner had was to find any SMALL leaks by running this test and then sealing them up. Yes you will know that you have a large or a small leak from a boost gauge, but finding a big leak isn't normally a problem, but trying to find a litle leak with no pressure behind it is a little more tricky. Link to comment Share on other sites More sharing options...
JohnA Posted June 15, 2005 Share Posted June 15, 2005 10mm Hg = 0.0133 bar 1 bar = 14.5psi 10mm Hg = 0.193psi Heh, I said 'mmHg' when of course it's inchesHg (easy to mistype when there are so many standards, mmHg are used extensively as well) About 30 of them are 1 bar. Link to comment Share on other sites More sharing options...
ardasaliah Posted June 15, 2005 Author Share Posted June 15, 2005 whats a healty vacum then! in (-) psi. I am thick! Link to comment Share on other sites More sharing options...
JohnA Posted June 15, 2005 Share Posted June 15, 2005 well 1 bar vacuum means that there is not a single air molecule (feasible only in outer space) over 1 bar vacuum means there's a brain leak Around 20inches Hg is normal vacuum for engines when at operating temp (closed throttle ofcourse), that's about 10psi vacuum. Link to comment Share on other sites More sharing options...
ardasaliah Posted June 15, 2005 Author Share Posted June 15, 2005 mines sits at (-)0.55 bar/ or (-)8 PSI ? Link to comment Share on other sites More sharing options...
JohnA Posted June 16, 2005 Share Posted June 16, 2005 That's how mine is when idling cold - remember that idle control valves etc are controlled intake leaks. A cold engine doesn't seal fully either. On hot idle the vacuum is higher, and lifting the throttle with the car moving I can see 20 inHg, which is around 10psi I hope others will chip in with their readings. Link to comment Share on other sites More sharing options...
ardasaliah Posted June 16, 2005 Author Share Posted June 16, 2005 -0.6 bar when idle (hot) Link to comment Share on other sites More sharing options...
JohnA Posted June 16, 2005 Share Posted June 16, 2005 sounds about right Link to comment Share on other sites More sharing options...
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