Can this gauge be that off?
10-07-2017, 05:27 PM
#1
Drifting
Thread Starter
Can this gauge be that off?
So, I'm using this new but ultra cheapo vacuum gauge homemade attachment to perform a post-AOS seals & vacuum line (plus Laust Manifold!) checkup:
The needle 'rests' (a bit shakey) between 10 & 15.
The motor runs fine, a little smoother and snappier than before (I replaced a leaky ICV, CV, throttle screw, and evap diaphram black circle thing) but according to this gauge, this test is medicore, correct?
Is it at least reacting properly?
I didn't do this before the project, checking for leaks with the compressor method instead. In fact, I've never performed a vacuum test of any kind before lol
I did find Tom's poll thread and most of you have 17+ at idle. I read that "high performance" engines may have low vacuum due to valve overlap. Does the 951 motor fall into this category?
The needle 'rests' (a bit shakey) between 10 & 15.
The motor runs fine, a little smoother and snappier than before (I replaced a leaky ICV, CV, throttle screw, and evap diaphram black circle thing) but according to this gauge, this test is medicore, correct?
Is it at least reacting properly?
I didn't do this before the project, checking for leaks with the compressor method instead. In fact, I've never performed a vacuum test of any kind before lol
I did find Tom's poll thread and most of you have 17+ at idle. I read that "high performance" engines may have low vacuum due to valve overlap. Does the 951 motor fall into this category?
10-10-2017, 06:04 PM
#2
Drifting
Thread Starter
Yes it can!
I managed to borrow a pro vacuum gauge and wow, is that cheapo thing ever off!
Hard to see, but the pro gauge is reading a solid 16 & very steady (the cheapo was reading about 12-13 and a little shakey)
Even the pro gauge can be read .5 to 1 hg different depending on the angle (at rest, depending how you hold it, the needle is either bang on zero or .5 either way)
I guess it's correct when they say the behaviour is more important than the actual reading lol
I've also included the dash reading
There ya go
Hard to see, but the pro gauge is reading a solid 16 & very steady (the cheapo was reading about 12-13 and a little shakey)
Even the pro gauge can be read .5 to 1 hg different depending on the angle (at rest, depending how you hold it, the needle is either bang on zero or .5 either way)
I guess it's correct when they say the behaviour is more important than the actual reading lol
I've also included the dash reading
There ya go