I'm looking at a CRX with a LS/VTEC motor. It has a compression ratio of 12:1, but the guy im buying it from thinks its the knock sensor and i was just wondering if that was even possable and what els could be making it knock(other than bad gas)?

 

Is he running it with like 93 Octane or worse?

 

93 octane, I mainly wanted to know the worst possable scenario. and the ammount it would be to get the parts to fix it.

 

Depending on how it is built, LS/VTEC hybrid engines usually don't have knock sensors. The high compression ratio is what is causing it, the highest C/R I would use in a street car would be 11.5/1 but I ave heard of higher. In the worst case scenario, the engine will need a total rebuild/replacement. The amount of damage depends on how hard it pings, and how long the guy drove it like that.

 

Do you have Sunoco near you? They have 94 Octane. I use it and **** I probably have like 8:1.