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

Does compression gradually build up?

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Old Apr 30, 2004 | 02:58 PM
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rx_se7en_turbo_II's Avatar
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Does compression gradually build up?

im trying to purchase a t2 and the guy say he put a rebuilt motor into the car. here is what he said:

"Since the motor is still new, compression isn't fully there. I've had the motor running for about 7hrs, I estimate that to be around 500miles. I have the recipt for the motor. Since I removed the emissions equipment I haven't been able to get a good idle. "

is this true? is the motor still being broken in?

please help me out..
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Old Apr 30, 2004 | 03:02 PM
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Fitness Stain's Avatar
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from what ive read fresh rebuilds can have lower compression ... why i dont know, but i would search first and make up your own mind
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Old Apr 30, 2004 | 03:13 PM
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It does take some time for the seals and everything to get a good seating. If the housings are new, it will take longer than reused housings.
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Old Apr 30, 2004 | 03:18 PM
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From: https://www2.mazda.com/en/100th/
sometimes rebuilds dont have compression right off the bat, the more newer parts the better they run right off the bat.

ie we used to be able to tell a used housing mana motor from a new housing mana motor, because the used housing engines had a hard time hot starting for a while (500-1000miles) while the new housing motors start right up
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Old Apr 30, 2004 | 03:23 PM
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It also has to do with how they were put together. But yeah at first its gonna have lower compression...
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Old Apr 30, 2004 | 03:49 PM
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What sort of figures are we talking about for new motors,with new rotor housings,etc.?
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