9:1+
It should have a minimum of 70 psi.
One of the harder swaps I've seen done in a Prelude. Much custom work that has to be done, should not be your first experience with building a car.
A diesel engine requires at least a 20:1 compression ratio, or about double a gasoline engine. The PSI this translates to depends on the size of the cylinder. You will need to consult the manufacturer's service manual.
10:1 - 12:1 through that range is fine
14:1 compression
A KTM 85 typically should have a compression ratio in the range of 160 to 180 psi (pounds per square inch) when measured with a compression tester. This level indicates a healthy engine and optimal performance. If the compression is significantly lower, it may suggest wear or damage in the engine components, requiring inspection or maintenance. Regular checks are essential to ensure the bike operates efficiently.
120psi
60 p.s.i.
Alot.
94 prelude being the 4th GEN it depends on the model s-133HP si-158HP VTIR-190-200 ish
possibly a lot of carbon build up in the combustion chamber but in a lifetime I have never had a small engine with to much compression.
A KTM 65 SX should typically have a compression ratio of around 12:1 to 14:1. In terms of actual compression pressure, it can range from 120 to 150 psi when tested with a compression gauge. Maintaining proper compression is crucial for optimal performance, so ensure that the engine is in good condition and that the piston and rings are not worn. Regular maintenance and checks are recommended to keep the compression within this range.