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Opinions of compression numbers
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Have a new to me RX7 that ran these numbers in 11/21 by previous owner. What is everyone’s opinions on the numbers? |
Potentially on the way out with ~80 psi on a face on the front, though Mazda wasn't known for the best side seal clearancing anyway.
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Eh, Its a little low. I would continue driving it but just be prepared for a rebuild or replacement. So long as it drives how its supposed to and starts like kts supposed to then just live your life. You could have those compression numbers for 2 more months or 2 more years before anything happens. Just start preparing now so you're ready to deal with it when it happens
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Years ago compression numbers mattered to me and then I had a conversation with an old head who tracked his car for years. He told me "If it pulls good vacuum and starts OK just run it, it's a rotary and will need to be rebuilt at some point", those words ring more true today than ever before. When money is an issue you worry about your car failing, when you're in a better spot and can keep a contingency for an inevitable rebuild or hoard a spare engine it's less of a problem and you'll run until it fails. The words ring more true now with the higher cost associated with swaps, a quality swap at this point is as much or more than rebuilding and replacing everything (injectors, turbo(s), sequential parts, ems), the rotary is actually starting to seem cheap to me.
Run it, enjoy the car, save $6-8k for a quality rebuild when it's due. |
Originally Posted by Molotovman
(Post 12529754)
Years ago compression numbers mattered to me and then I had a conversation with an old head who tracked his car for years. He told me "If it pulls good vacuum and starts OK just run it, it's a rotary and will need to be rebuilt at some point", those words ring more true today than ever before. When money is an issue you worry about your car failing, when you're in a better spot and can keep a contingency for an inevitable rebuild or hoard a spare engine it's less of a problem and you'll run until it fails. The words ring more true now with the higher cost associated with swaps, a quality swap at this point is as much or more than rebuilding and replacing everything (injectors, turbo(s), sequential parts, ems), the rotary is actually starting to seem cheap to me.
Run it, enjoy the car, save $6-8k for a quality rebuild when it's due. |
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