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Well-Known Member
I have a long term project that I built with my son. We started when he turned 13 and it took 4 years to complete. The engine is a 318 .030 with Speed Pro L2266 pistons, 302 casting iron heads with big valves and minor port work, small RV type Lunati cam, performer intake and am edelbrock 600 cfm carb. Ignition is mopar electronic.
After the initial fire-up ( started immediately and had been pre-primed, lots of zink break- additive and plenty of break-in lube on the cam) engine ran for about 40 minutes everything seemed OK, 75 psi oil pressure. Began to drive it to put some miles on it for break-in. Began having significant lifter noise. Pulled the valve covers and discovered that 2 cam lobes had gone away. Drained and pulled pan, removed cam and lifters, flushed engine using the oil pressure switch tap on back of block. Dissembled the oil pump, cleaned and checked. Began re-assembly. New cam and lifters, got the engine mostly back together with the exception of rocker arms and shafts as well as pushrods. Career move stalled the project for 3 years.
Recently returned to project. Purchased new factory style rocker arms, shafts and pushrods. More zink, pre-lubing, cam break-in grease and additive. Installed buttoned it all up. Reinstalled AC system. Restart, ran for about 30 minutes. Oil pressure at 75 psi, temp 180, all the rockers seem to be oiling correctly. Drove it for about 30 minutes at varying speeds no heavy loads. Pulled into shop and hear a knock. Knock seems to increase when AC compressor is engaged. Tried to identify but could not pin it down. Replaced AC compressor but still have the knock which is again louder when the AC compressor is engaged. Timing is 15 btdc and AF gauge is around 11:1, automatic transmission with a 2200 stall convertor.
I now have brain lock and am looking for suggestions, would appreciate any help!
After the initial fire-up ( started immediately and had been pre-primed, lots of zink break- additive and plenty of break-in lube on the cam) engine ran for about 40 minutes everything seemed OK, 75 psi oil pressure. Began to drive it to put some miles on it for break-in. Began having significant lifter noise. Pulled the valve covers and discovered that 2 cam lobes had gone away. Drained and pulled pan, removed cam and lifters, flushed engine using the oil pressure switch tap on back of block. Dissembled the oil pump, cleaned and checked. Began re-assembly. New cam and lifters, got the engine mostly back together with the exception of rocker arms and shafts as well as pushrods. Career move stalled the project for 3 years.
Recently returned to project. Purchased new factory style rocker arms, shafts and pushrods. More zink, pre-lubing, cam break-in grease and additive. Installed buttoned it all up. Reinstalled AC system. Restart, ran for about 30 minutes. Oil pressure at 75 psi, temp 180, all the rockers seem to be oiling correctly. Drove it for about 30 minutes at varying speeds no heavy loads. Pulled into shop and hear a knock. Knock seems to increase when AC compressor is engaged. Tried to identify but could not pin it down. Replaced AC compressor but still have the knock which is again louder when the AC compressor is engaged. Timing is 15 btdc and AF gauge is around 11:1, automatic transmission with a 2200 stall convertor.
I now have brain lock and am looking for suggestions, would appreciate any help!