Search results

I just noticed 'main bearing' should be 'rod bearing'. I have corrected my original post

I don't think it is an issue. The valvetrain runs at half crank speed. That's 1300 cycles per minuite at redline, quite slow by auto standards. Valve springs can get weak as time goes by and some of these engines are 40+y old. Increasing the boost also puts more demands on the intake valve...

Thanks for clearing up my error Perhaps the older engines lacked them

Page 33 of the LDS-465-1 (June 69) troubleshooting manual states manifold pressure is to be set at 18-20" Hg at 2400rpm, full load. This is about 9-10 psi. Page 9 states the HP is 170-185 at 2600rpm The graph on page viii shows a 10hp increase between 2400 and 2600rpm. A 200 rpm increase at...

Metal is a lot stronger in compression than tension. Power compresses the rod (where it is strong). The piston reversal at TDC puts the rod in tension. The force increases at an exponential rate as RPM goes up. This is why a lot of rods fail. Tension can also cause the big end to go out of...