2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.

Bad Compression?

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Old Jun 17, 2005 | 04:05 PM
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RX(ZONE)'s Avatar
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Bad Compression?

Well when i first bought my car, i had it inspected at a mazda dealership, and the mechanic there said my compression is 55 for both rotors.

I also read on this site that someone had a compression of 100 for their rotors.

I am wondering if I have bad compression? I drive an 86 GXL
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Old Jun 17, 2005 | 04:10 PM
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yea you should have at least around 80 for a minimum and 55 is going, going, gone.
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Old Jun 17, 2005 | 04:13 PM
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Is there anything i can do fix this, or am i pretty much toast?
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Old Jun 17, 2005 | 04:13 PM
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rebuild time
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Old Jun 17, 2005 | 04:16 PM
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Well i plan on swapping it for a tII engine once i get the money, but im just wondering if there is anything i can do in the mean time?

Also, how much would it cost to do a rebuild? (I live in canada btw)
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Old Jun 17, 2005 | 04:24 PM
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um...well you could start by looking it up online.....call companies and inquire there. And in the mean time, just be easy on the car.
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Old Jun 17, 2005 | 04:32 PM
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Rebuild the engine or swap a rebuilt motor in.

-=Russ=-
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Old Jun 17, 2005 | 04:39 PM
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Originally Posted by 88t2romad
um...well you could start by looking it up online.....call companies and inquire there. And in the mean time, just be easy on the car.
I have been quite easy on the car, it has quite a bit of km's on it, so im assuming thats why its as bad as it is, but i didnt know how bad it was.

Also, shouldnt an establshed Mazda dealership know whats up? Why would they tell me this was good compression?
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Old Jun 17, 2005 | 04:41 PM
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mazda people know nothing about rotary engines about 80% of the time maybe even more.
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Old Jun 17, 2005 | 04:47 PM
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Well then.

Thank you for that information. Much appreciated.
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Old Jun 17, 2005 | 04:51 PM
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They probably felt the air with their hands and so that means its good. lol They probably didn't even warm it up or anything else to compression test it so its probably like 40 to 45psi.
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