1971 9.5 compression & spark plug

[wind knot]

Well I re-checked the compression(cold as before) and it hasn't changed. My gauge is a o ring type but not a expensive one. It reads 60lbs a hole even. I also noticed the plugs I put in(B6S) are as clean, as when they were installed. The piston wash is black but the plugs are clean, is this a sign of water entering the combustion chamber?.

 

[wayne h]

Re: 1971 9.5 compression & spark plug

compression checked are done with the engine hot.the plugs should be champian j4c gapped at .30 do a compresstion check with the engine hot.how long where the plugs run ? do they have any gray color to them ?

 

[wind knot]

Re: 1971 9.5 compression & spark plug

I only ran the plugs for about a half hour, at mostly heavy throttle. The plugs are both a grey colour. I will do the compression, while the motor is hot and see what I get for a reading.<br /><br />Thanx, Darrell

 

[wind knot]

Re: 1971 9.5 compression & spark plug

I only ran the plugs for about a half hour, at mostly heavy throttle. The plugs are both a grey colour. I will do the compression, while the motor is hot and see what I get for a reading.<br /><br />Thanx, Darrell

 

[wayne h]

Re: 1971 9.5 compression & spark plug

gray is good 1/2 hour is hard to read a plug. do another compression check and let us know what you come up with