I bent a couple of push rods so I did a compression test to see if the valves might be bent. The cylinder that had the bent push rods read 195 lbs and the highest cylinder was 205. I know stock should be between 130-160. My heads are afr 165 with a 58cc chamber. Would this be why my cylinder pressure is so high or is there some other reason. The shortblock is the original with 175,000 miles on it.
Is 200 lbs of cylinder pressure high
- Thread starter tistan2
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Mike86Stang
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408stroker5.0
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Your spring's may be too stiff which could cause the pushrod's to bend. Are you using a stock cam??? If so the spring's that come with the AFR 165's I believe are too much for a stock cam, thus causing serious coil bind. As for the compression... 200 is high but I woudn't complain. Although MSTANG may be right as well.
How much do you suppose a pushrod would need to be bent in order not to move the valve at all?? Consider stock lift when figuring it out. It seems to me that if it were bent that much, you would definitely here some saddening sounds from the motor. I'd guess you'd need close to .500" deflection to shorten it .444". I haven't been intimate with my geometry lately, so that's just a guess.
58cc heads on a stock block should yield around 10.5:1. 175,000 miles of build up on the pistons will raise that figure a little bit. My pressures were 180-190. You could gain/lose 10-20 pounds depending on the condition of the rings.
58cc heads on a stock block should yield around 10.5:1. 175,000 miles of build up on the pistons will raise that figure a little bit. My pressures were 180-190. You could gain/lose 10-20 pounds depending on the condition of the rings.
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