Compression Loss Wont Start? - NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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2nd Generation Specific 1986-1992 Discussion

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Old 07-16-2003, 06:12 PM   #1  
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i think i might of figured out why my T2 wont run since it was sitting for so long during winter and wasnt put all the way together.



a guy told me that my seals might have shrunk and they need to build compression so the engine will run could that be the reason if so how do i build compression in the engine and does that makes sense compared to my MAFS and my vaccuum lines and exhaust leak but if it didnt have compression why did it turn over and start then die it shouldnt of started should it?



any comments would be great.
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Old 07-16-2003, 06:15 PM   #2  
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you can do the atf trick, refer to FAQ

that helps alot, even with lost compression the engine will start and even run, but will sound like a helicopter and will die, but that will do more damage to it
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Old 07-16-2003, 07:02 PM   #3  
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now see we started the car with no compression and it made the car worse (i thought) but im not sure
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Old 07-18-2003, 08:32 PM   #4  
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I have a 87 T2 that sat in a junkyard for 4yrs due to a engine fire and when i put it back together the motor still had good compression. I don't think the seals woill shrink or dryrott. I put ATF in it before i started it for the 1st time. But it is possible the motor is low on compression. you will not hurt the engine by starting it. it could be several prolems bad motor, vac leak, fuel probem, bad ignitors, timing,. you should check compression 1st off.
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Old 07-18-2003, 08:36 PM   #5  
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they flood very easily too...
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Old 07-18-2003, 08:38 PM   #6  
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never heard of apex seals shrinking....... maybe broken apex or side seals
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Old 07-19-2003, 06:30 PM   #7  
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Quote:
Originally Posted by 87BADASST2' date='Jul 18 2003, 07:32 PM
I have a 87 T2 that sat in a junkyard for 4yrs due to a engine fire and when i put it back together the motor still had good compression. I don't think the seals woill shrink or dryrott. I put ATF in it before i started it for the 1st time. But it is possible the motor is low on compression. you will not hurt the engine by starting it. it could be several prolems bad motor, vac leak, fuel probem, bad ignitors, timing,. you should check compression 1st off.
you can hurt a blown engine by starting it. if it has low compression due to a broken apex seal, starting it will just spin the rotors and possibly scratch the housings. if that were to happen, then you will have to spend hundreds more on a rebuild than necessary.
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