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Drop in compression

Question : I drive a Honda Accord CA5. Recently I sent the car for a compression check, and it seems the result shows that it has dropped from 150 bar to 100 bar. The mechanic told me to grind the valves to get back the original compression. What are the parts involved in the procedure, and how long will it last once I grind the valves?

Answer : Unless the mechanic did a proper wet and dry test, he has no way of knowing if the loss of compression is because of worn rings and pistons or valve seats. What he probably wants to do is to remove the head and do a valve job and then check the pistons for wear and then tell you the bad news when the head is off. I would suggest that you be sure of what needs to be done before taking the head off. If the car has built up quite a lot of mileage I think the rings and possibly pistons may need to be replaced.

 
 

Dry or wet test

Drop in compression

Wet and dry compression

Grind the valves

Compression test

 

 

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