How much compression should a Mazda rx8 have?
7.5-7.9: This is an acceptable engine. Most engines from Mazda seem to be in this range after the break-in period. Stay on top of the other failure points possible, and you should get at least 40-60k more out of this engine, if not more.
What is good compression on rx8?
Continuous low cranking compression pulses strongly suggest the failure of at least two apex seal, corner seal and/or side seal sets. Note: Race engines (peripheral or bridge port) generally have a normal compression pressure of 90-120 PSI.
What causes a rotary to lose compression?
Apex Seal wear, is the primary cause of low engine compression. In some cases the seals just wear out naturally, the level of vertical wear exceeds the point in which the apex seal springs can no longer take up the slack causing further gas leakage and thus less compression.
Where can I get a compression test on my Mazda RX-8?
In those cases, a dealer is going to be your only option. If the RX-8 you are looking to purchase is at a non-Mazda dealer, your best bet is to simply ask the dealer if you can take it to the local Mazda dealer to get a compression test. If they decline, they ask if they can do a proper compression test.
Where can I get a compression test done?
Where can I get a compression test done? Only Mazda dealers will be able to do a compression test, unless you happen to live near one of the bare handful of non-Mazda owned rotary compression testers. A few RX7Club and RX8Club members have them, and most of the small number of rotary specific shops have them.
How does a compression test work on a rotary engine?
A typical cheap analog tester just plugs into a spark plug port and as the engine cranks, the needle moves, and you can easily see where it’s swinging to every compression stroke. 1 spark plug, 1 cylinder, 1 compression number. The rotary however is 1 spark plug, 3 rotor cavities, 3 compression numbers per revolution.
Can a Mazda Baro pass a compression test?
There have been quite a few reports of Mazda techs returning BARO numbers that clearly fail and stating that they pass, so if it fails compression but passes vacuum, I’d question the techs quite a bit about making sure they did it right. Where can I get a compression test done?
In those cases, a dealer is going to be your only option. If the RX-8 you are looking to purchase is at a non-Mazda dealer, your best bet is to simply ask the dealer if you can take it to the local Mazda dealer to get a compression test. If they decline, they ask if they can do a proper compression test.
Where can I get a compression test done? Only Mazda dealers will be able to do a compression test, unless you happen to live near one of the bare handful of non-Mazda owned rotary compression testers. A few RX7Club and RX8Club members have them, and most of the small number of rotary specific shops have them.
A typical cheap analog tester just plugs into a spark plug port and as the engine cranks, the needle moves, and you can easily see where it’s swinging to every compression stroke. 1 spark plug, 1 cylinder, 1 compression number. The rotary however is 1 spark plug, 3 rotor cavities, 3 compression numbers per revolution.
There have been quite a few reports of Mazda techs returning BARO numbers that clearly fail and stating that they pass, so if it fails compression but passes vacuum, I’d question the techs quite a bit about making sure they did it right. Where can I get a compression test done?