this is the crank with the bob weights attached to the rod pins spinning at a balance speed the bob weights are filled with lead shot that equals the exact weight of the pistons,pins,rings,bearings,locks,connecting rods and some oil allowances.We like to balance old school on a non computer machine with floating sensors so if the crank is out of balance you will see imediately it will shake like crazy.It takes quite a bit longer but you no its right when it taken off the machine.
Last edited by TOM NELSON; 08-03-2009 at 11:15 AM.
Heres the bare l92/ls3 cyl head getting the chambers ported its pretty amazing to watch the cnc cut these heads So i made a video of it and of a bunch of the little tricks in cyl heads for you guys i will post in next week some time but heres a buch of photos in the mean time
This is one of the most important aspects of cyl head work is knowing what seat profile to put on the combination your working on.Seat angles,radius,widths are super super important.You can have and incredible port and kill the head with the wrong valve job.The Valve job allows the air to get around the valve into the cylinder.Heres a few shots of the head being cut and set up
Here we are testing each spring individually to make sure the spring pressures are up to snuff.I like to have specific open and closed presures to control the valve at speed and especially under boost,because with a boosted engine you not only are fighting rpm but extra pressure thats being applied to the back of the valve.If this is wrong float city and the motor will usually decides it wants to eat the valve.
Brian Hobaugh SCCA National Tour June 2014
First Hemi 'Cuda Convertible Ever Built
Short clips: Goodguys Pleasanton autocross and pit videos
if we can we also like to trim cut the counter weight instead of drilling holes for less oil windage
this is the crank with the bob weights attached to the rod pins spinning at a balance speed the bob weights are filled with lead shot that equals the exact weight of the pistons,pins,rings,bearings,locks,connecting rods and some oil allowances.We like to balance old school on a non computer machine with floating sensors so if the crank is out of balance you will see imediately it will shake like crazy.It takes quite a bit longer but you no its right when it taken off the machine.
it wants to eat the valve.
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