exhaust valves

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exhaust valves

Post  Larry Williams on June 27th 2012, 4:55 pm

What situations can cause the transfer of aluminum to the exhaust valve face? its on all 8 exhaust valves
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Re: exhaust valves

Post  IDT-572 on June 27th 2012, 5:20 pm

Lean or low timing.
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Re: exhaust valves

Post  c.evans on June 27th 2012, 6:04 pm

Generally a very lean condition, especially when one is spraying nitrous. The aluminum comes from either the piston tops, or from the chambers. If you clean the chambers carefully you may see some porosity holes in the casting that weren't there before. They tend to be more commonly found in the cuspid between the two valve seats. That same lean condition also tends to blow head gaskets.

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Re: exhaust valves

Post  Larry Williams on June 27th 2012, 6:10 pm

timing was at 32 degrees it was very lean at least looking at the plugs
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