yamie 1
New member
i just had the compression tested on my viper. the compression, when engine is warm was( when sitting on machine) 100 on left cyl , 120 on mid cyl and 125 on right cyl . can anyone tell me if this is normal. if not what would be the best corrective action. what is normal compression on a viper. i would presume that comp. should be the same on all three.
taped throttle
Member
those numbers sound right. viper head has a larger dome on pto cylinder, so the compression is lower. they staggered compression to allow for straight jetting due to the pipe design.
there is a lot of info on this topic, just do a search you should get a ton of informative reading.
there is a lot of info on this topic, just do a search you should get a ton of informative reading.
yamie 1
New member
what would the compression had been when it was new
EricMichael
New member
those numbers are good, probably around new..I wouldn't worry about it all compression testers read diffrently cause of longer hoses etc.