BeemerBerg Posted May 12, 2015 Share Posted May 12, 2015 When I spent some real 'quality time' getting the valve gaps JUST RIGHT on my oilhead or hexhead, the reward would be a glass-smooth, quiet engine. Now that my current steed has shims ('semi-spheres?'), I wonder if I need to be as anal about getting the gaps 'dead bang' right, seeing that to do so, I would have to have acquire a collection of those little buggers. Here's the stats at 30K: intake gaps: .13, .13, .14, .16 (acceptable: .13-.23) exhaust gaps: .35, .38, .38, .40 (acceptable: .30-.40) I understand that it's better to have a larger gap for better valve cooling--so it looks like an adjustment is soon needed on the intakes. I hear that camheads require far less valve maintenance than the older models, so maybe once the changes are done, it would last a very long time. So, my question: is it worth my time / investment to reduce the variance in gaps (by replacing shims), and would it result in a smoother performing engine?? I don't mind spending ~ $7 a pop, since my nearest dealer is about 4 hours away. Anyone out there have swapped shims and noticed a smoother engine as a result? Link to comment
dirtrider Posted May 12, 2015 Share Posted May 12, 2015 Morning Ken You won't notice any smoother operation by evening out the valve settings (just not that critical). I personally like to run the exhaust near max but the intakes I keep in the mid range (but again, as long as within the BMW spec range, you won't have any issues) As far as acquiring a collection of semi-spheres?--in a lot of cases you can swap your existing semi-spheres between positions & gain on a couple of valves so your next move is to see what you have at what position (you already have the lash per position) then figure out if you can use a few of your existing at different positions. Then you can buy what you need to finish out the remaining valve positions. Link to comment
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