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Originally Posted by springer-
What the spring does is increase pressure on the bypass valve. Making it harder to open. If the spring is set for 38lbs, then when the oil pressure hits 38lbs it opens the valve and doesn't allow any more pressure to build up. If you change the spring with a stiffer spring the valve opens up later and cause the oil pressure to rise. If it is set for 40lbs, the valve will then open at 40lbs. This increased oil pressure helps keep the lifters pumped up a little stronger and thus keeps the noise down.
The old way was to stretch a spring but that yields unreliable results. Another way to increase the oil pressure in the twin cam is to simply put a washer between the stock spring and the roll pin that holds it in. This effectively increases the spring pressure. You can actually shim the stock spring for whatever oil pressure you desire. Start with a single .050 washer.
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But will increasing the oil pressure have any undesired side effects?? Leaking, pre-mature lifter failure, pre-mature oil pump failure??
