hello everyone new to board,i'm having a new club cam 206/206,lifters,double roller timing chain & adj. pushrods installed in may 87gn, i would like to know on the pushrods down the road do they need to be re'adjusded & if so how often. thanks joe
I wouldn't put adjustable pushrods in the motor. Use one to get the right length and preload measured and then order a set the right length.
Ken is correct. You should do one for intake, and one for exhaust if you have different lifts. If the lift is higher on the intake, that means you have a smaller base circle on the lobe. Therefore, you need a slightly longer pushrod to get the rocker in the right position. Most people ignore this step because the difference is so small. The rocker is in the right position when the roller tip is about 1/4 of the way across the valve stem tip when the valve is closed. At half lift, the roller should be about 3/4 of the way across the tip, and at full lift, the roller should be at its original position about 1/4 of the way across the tip. IOW, cover the center half of the valve stem tip with the roller.Wiil follow with another post on pushrod lengths.
You should rent an adjustable pushrod gage from the pushrod guy. Then when you have it set at the right length, including lifter preload, you return the gage to him and he will measure it to assure the right length solid rod will be made. The problem with a person trying to measure the rod themselves, is they don't have the special gage to measure it once it's length is set. Because p/r's have a drilled oil hole with a chamfer in the 5/16" ball, the chamfer edge is what you would measure for overall length. The p/r manufacturer has a special gage that looks like two 90 degree cones opposite each other on a slide. one cone is fixed, and the other slides until the pushrod is held tight between the cones, and the cones touch the ball o.d., not the chamfer. That way the p/r guy knows exactly how far apart the center of the balls are without trying to measure over a chamfer that could be at various depths. Sorry to get so technical with this subject, but we are all here to share our knowledge about engines.
thank you mr. mosher & mr.webb for your technical advice, if it wasn't for sites like this one i would be lost thank you, i will keep you posted on how my mechanic is doing he should know this.. thanks joe