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..

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

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.

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

It also has to do with how they were put together. But yeah at first its gonna have lower compression...

What sort of figures are we talking about for new motors,with new rotor housings,etc.?