Doof 11 Posted February 17, 2008 I'm currently rebuilding my S16 engine ready for this summer and i'm going to take some bits to Shenpar for some work. Just wondering if its worth cutting back the stems on the standard S16 valves? Anyone experiemented with shapes of the back of the valve or the stem thickness? Should be a relatively cheap modification that should in theory increase flow nicely? Any thoughts? Lewis Share this post Link to post Share on other sites
Sandy 189 Posted February 18, 2008 Usually a waste of time IMO. If you want thinner stems, you can use the later XU10 or RS head. Share this post Link to post Share on other sites
NColl 0 Posted February 18, 2008 I'm currently rebuilding my S16 engine ready for this summer and i'm going to take some bits to Shenpar for some work. Just wondering if its worth cutting back the stems on the standard S16 valves? Anyone experiemented with shapes of the back of the valve or the stem thickness? Should be a relatively cheap modification that should in theory increase flow nicely? Any thoughts? Lewis I have never seen a worthwhile increase in flow with a wasted stem. The shape of the back of the valve and the valve seat preperation on the valve and cylinder head would show a small increase in flow. Although i have never tested a wasted stem in a standard port, i have only tested wasted stems in modified ports. Any flow increase would only be marginal anyway. NColl Share this post Link to post Share on other sites
