Crit

iTrader: (6)

What does this EKG tell you?

djessence

Well is says that the atrial valves on your heart are not being sufficiently stimulated by the required nodes.

Or it could mean you've got one good seal, 1 mediocre seal and 1 bad seal on your front rotor. Or at least thats how i would interpret it?

djessence

and actually looking at it, isnt the compression overall (ignoring the huge differences in the front) fairly low, the peak being like 80?

MattG

iTrader: (2)

Did you just have that done?

Its the engine pulses,

You front rotor is Shot, see the peak every three blips, that means that one rotor facing is haveing some what of a good compression, where the other faces are not.

The Rear is fine, 3 equal pulses, thats how they should look.

-Matt

Stevan

iTrader: (17)

One apex seal is sticking or worn out.
Not sure IIRC, 80 psi is medium / low.

Jeff20B

iTrader: (13)

Stevan is correct. One less than ideal apex seal.

If it showed only one low peak, it would indicate a bad side seal.

Crit

iTrader: (6)

Yeah, I know. I found that scan of an old 4-port I had that ran fine, but overheated often. It ended up going cheap with a good GSL, but I didn't realize just how bad it was until I had that compression test done. As far as the 80 psi, I'm not a big believer in that number. If a tester has long or large-ID tubing, it'll always show low compression. Anything that's too large to fit between the engine and fender will show lower numbers.

hanman

Anybody know where i can get rolls of that paper?

ray green

iTrader: (14)

Or the compression tester in the Atlanta area? Crit I may be having a problem with the White One.

Crit

iTrader: (6)

Yeah, Dave Girod did that at a Varsity meet soon after my engine swap. I've got a manual compression tester if you want to borrow it, Ray. Girod's tester is the old, original Mazda tester and I have no idea where he got the paper.

ray green

iTrader: (14)

But wouldn't a manual tester record only the highest compression of the three rotor faces? It wouldn't detect a problem in a rotor if just one seal went bad, as seems to be the case in your EKG.

But if two seals are bad, a manual tester would pick it up, right? Without two good seals you can't get good compression, so that rotor would read low.

But if an engine starts running badly over a period of 100-200 miles, until it's hard to keep running and won't keep an idle, it's probably just one seal going bad, not two, right?

So it sounds like I need one of those fancy EKG machines. For a car located 55 miles out of Atlanta. That doesn't run. Any rental units out there?

Crit

iTrader: (6)

No, no such thing as a rental, and new testers are digital and VERY expensive. I made a tester that doesn't have a peak-hold or bleed, so you're just measuring the chamber pressure with nothing fancy. I can show you how to use it, but it's a pretty good home-made tool.

ray green

iTrader: (14)

I think I'm going to need it, the sea foam didn't work. So it reads out chamber pressure continuously - while the engine is cranking, you just look at the dial? Sounds perfect.