So, some of you will be familiar with the problems I had with my 8 starting back this summer. I took it down to Bountiful Mazda in Utah and they did the MSP16 recall on it. I also asked them to do a compression check bc of the overall symptoms it had.....and here are the results. They say that this is in spec due to the altitude it was taken at....any thought, ideas, or concerns please let me know. I am right now.

Edit: Sorry if it being 'sideways' I don't know how to get it rotated 90 degrees.

 

89 psi @ 250 rpm ? average. not great tho.

 

Not in spec. You need a new engine. The min is 680Kpa in 250rpms. Your test was below 680Kpa for every chamber.

 

never mind. RotaryPilot was right. I keep on thinking is the other value.

Your engine is WAY below Minimum spec. IF they dont want to replace it, bring it to some other dealer and give them the numbers.

 

A engine compression test IS effected by ambient pressure... so if your at something like 4,000 foot elevation its probably not bad

 

It is but, 620 KPa is not even funny.

 

Well, it's above malad summit so it's probably somewhere between 5k-6k in elevation, but not sure exactly what. Kinda explains the 142 hp dyno though Do you think I would be better off to call to another dealership....Bountiful was over 200 miles away, and the one in twin is like 175 miles away, not exactly light driving just to be turned down. My lowest lobe was 83 psi

 

200 miles to the next dealer !?

hmm ...

 

call up mazda of north america.

but it probably is within spec for that altitude.

 

how do you lose compression?

 

^normally once your flux capacitor goes out then you start to loose compression

 

So...anyone have any input? Should I just premix from here on out and call it good or continue the hunt? Also, can anyone find out for SURE if those numbers are in spec for the altitude? TBH, they look pretty close from lobe to lobe.....which is a good thing I guess.

 

Yeah those flux capacitors do tend to burn out on them rotaries

 

Rotated and darkened chart attached.

 

My super quick math says that you have higher than 110psi at sea level. I could do the math for you but I'm much too lazy.

Also my math could be off. If anyone wants to do the calculation he's 4360 feet above sea level, or 1330 meters. I got the elevation by using google earth and the address of the mazda dealership.