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.
You can never be to clean cleaning everything not only makes them proper for assembly but allows you to inspect the part for the last time before final assembly
here we are setting up the installed heights the installed height is the distance between where the spring seats on the bottom of the retainer and where the spring seats on the head on the whats called the spring pad.To increase pressure or equalize pressures from spring to spring or variances in installed heights we use shims underneath the spring cups to make everything equal.
Last edited by TOM NELSON; 08-03-2009 at 11:24 AM.
The flow bench is much like a lie detector like a dyno is it measures how much air flows threw the port at given valve lifts.It has taught us huge amounts about horsepower production so we flow the heads to make sure its doing what its suppose to do these particular heads flowed 357 cfm at 650 lift on the intake and 260 cfm on the ex at 650 the ex ports on ls engines are known for being weak suck compared to there intake counter part.So there is quite a bit of work done to the exhuast side of this head.
Last edited by TOM NELSON; 07-31-2009 at 08:18 PM.
Heres a shot of the head finished notice we lap each valve to its specific seat and label them .Also we use ex valves made from inconel material this material withstands much more heat then stainless and in a turbo application you need this because the cycling of the valve will cause the head to actually deform and tulip when its glowing red hot.
The flow bench is much like a lie detector like a dyno is it measures how much air flows threw the port at given valve lifts.It has taught us huge amounts about horsepower production so we flow the heads to make sure its doing what its suppose to do these particular heads flowed 357 cfm at 650 lift on the intake and 260 cfm on the ex at 650 the ex ports on ls engines are known for being weak suck compared to there intake counter part.So there is quite a bit of work done to the exhuast side of this head.
How much test pressure(inch) do you flow the turbo engine at? killer setup I like the honing plate.
Well i found some of the other pics i had taken so i'm going to back up a bit for a few posts.Heres a shot of us checking and aline honing the main saddles to the housing size we like to see this is one of the first things we do once we know the block is sound
Brian Hobaugh SCCA National Tour June 2014
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Testing the Springs
it wants to eat the valve.
ing not only makes them proper for assembly but allows you to inspect the part for the last time before final assembly
Hybrid Mode
