No one has to explain anything to me. The way you guys are doing it will show a lower comrpession reading. Then some of you say doing a comp test with the valve closed will give you the highest comp reading for all 3 chambers which is wrong.

I feel like im repeating myself. Unscrewing the valve will be even worse, you are better off holding the valve in.

And why wouldn't you use electrical tape to hold the valve? Give me a good explaination? Just like the guy that though holding the valve half way open would give you bad readings when infact it will give you more accurate readings.

Glad none of you are doing a compression test on my motor.

 

I wish you would just go away.

Since when do we have to listen to you?

Your suggestion are so ludicrous, it's not even funny.
Just because it works for you, suddenly it applies to everyone?
Using electrical tape on the valve or holding it half way open is the stupidest thing I've ever heard.
No matter how you slice it, NEITHER are "more accurate" versus a Mazda SST.


-Ted

 

Never will

Never said you have to. Spreading crap like, only hold the valve all the way open is rediculous or saying to keep the valve closed will give you compression numbers for each chamber is just plain wrong.

As usual you have no useful information to give and instead would rather start arguments.

Tell me why?

No not everyone but its common sence. You have the valve open all the way, more pressure will be released showing a lower reading.

I find this funny. Tell me why? How else would YOU hold the valve open? I suppose if the tester is built in such a way where you could remove the check valve, that may be even better.

We are not compairing Mazda's tester with a piston tester are we? And YES, one way IS more accurate then the other. Again, not compairing Piston tester to the Mazda tester.

 

Rotaman99, when I said "When you let go of the release, you'll get the max pressure of the three chambers ", maybe I wasn't very clear.

What I was trying to say is leaving the valve closed will give you the pressure of whichever chamber is the highest, not the highest pressure of each individual chamber.

Also, holding the valve open or half way, you can never have an accurate absolute pressure, because as the rotor compresses the air against the housing and moves the gauge, some air is escaping through the release valve. Watching the bounces is useful for comparing chambers only.

 

Because I don't get caught with the absolute numbers.
You seem to like to fudge your readings so they come close to what Mazda states.
My compression testers either don't come with Schrader valves, or I just take them out.
Maybe you can figure out how I did that...


When why would you care what Mazda wants in terms of absolute numbers?
I stated that it is not important what the absolute number was as long as all the pulses are all about the same.
You're trying to **** with the tester just to get your numbers to get closer to what Mazda specs are.
How can you claim you're not "compairing" number?
Why are you bothering to try and get your numbers to read higher?
Duh?


Your argument is flawed.
Try again.


-Ted

 

So you don't tell others what they have for compression when they ask?
BAhahahah!

Thats a bunch of bulshit! My numbers are what I got from doing the compression testing the way I have been explaining. Show me where I fudged my numbers? Im sorry you can't figure out how to do the compression testing right and get good numbers with a piston tester.

I like to know what my compression numbers are as close to actual as possible without the mazda tester. I can't make the compression HIGHER by holding the valve open half way or keeping it closed, the actual compression stays the same, you should know this, but the reading on the pressure gauge will read closer to what the compression actually is. Why is this such a bad thing?

Absoutly not. Your trying to say that trying to get as close to the actual compression numbers of the engine is not a good idea? Don't do any compression tests on anyones engine please since your numbers will be flawed and you will tell them a lower compression number then what they actually have.

Sorry for misunderstanding ya
Your right some air is escaping and this is what im trying to tell everyone. Holding the valve only half way open wont allow as much pressure to be release, therefor getting a high pressure reading. With the valve all the way open, my pressure reading was between 85-90psi, half way open was around 105-110 and closed was 115. So it does make a difference. You will be able to tell about what number the compression is from how high the needle bounces. If the compression is about the same on all faces, the doing what SpeedofLife was saying wil work just fine.

 

I don't want to remove mine. That would contridict what I have been saying. BTW, if I wanted to remove it, it would take me a few seconds to do it.