kennyd Posted June 27, 2018 Share Posted June 27, 2018 Does the alloy rocker make the top end quieter than the std metal rocker cover,(not that the valve gear is noisy) curiosity more than anything ??? Quote Link to comment Share on other sites More sharing options...
RobPearce Posted June 27, 2018 Share Posted June 27, 2018 It is often stated that one of the benefits of alloy covers is the reduced noise. However, I've also seen claims that (in some cases) the alloy cover can act as a sound box to amplify tappet noise. Quote Link to comment Share on other sites More sharing options...
TedTaylor Posted June 27, 2018 Share Posted June 27, 2018 To be honest its really a bling thing in my opinion, you have one because they look good. And that is from someone who has SAH covers for two of this cars - Woody and AFH !!! MUT Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted June 27, 2018 Share Posted June 27, 2018 on advantage is it takes on engine temperature and doesn't get cooled so much by the fan airflow so in colder weather you wont make so much mayonnaise or hair cream in the cover as you can with a tin one pete Quote Link to comment Share on other sites More sharing options...
iggy Posted July 3, 2018 Share Posted July 3, 2018 one thing thats an advantage with the alloy rocker cover it doesnt collapse when tightening down, also i think there might be enough depth round the edge where the gasket fits to have a groove machined into it for a PTFE seal, Quote Link to comment Share on other sites More sharing options...
Pete Lewis Posted July 4, 2018 Share Posted July 4, 2018 Many places sell a long life neoprene gasket which sits nicely on the flat face for 4 and 6cly covers. It wont fit tin covers Eg tssc shop and rimmers I was instrumental in the idea to develop, a seal a long way back Pete Quote Link to comment Share on other sites More sharing options...
TedTaylor Posted July 13, 2018 Share Posted July 13, 2018 I use cork gaskets on both tin and aluminium rocker covers and have no leakage problems. Secret is to make sure the contact surfaces on the cover and head are cleaned up properly if they are dirty - a wire brush is usually all that is needed on tin ones or use an old flat screw driver with rounded corners. Carefully square up the dips around the stud holes with a light hammer on tin ones if there are any from excessive tightening of the nuts, then using a fresh gasket stick it to the cover with contact adhesive on tin covers. Grease the other side of the gasket (mating with the head) and replace the cover and screw down the nuts carefully until they tighten on the cover so that they do not much more than nip them up. With my aluminiun covers I make sure both mating faces of the cover and head are clean and lightly coat with grease. The grease holds the gasket in place on the head and the cover lowered on carefully and again the fixing bolts are little more than nipped up. With both methods it is usually possible to re-use a gasket once or twice provided the fixing nut has not been tightened too much. This is how I have done it since the 1960s and never had leakage problems. MUT Quote Link to comment Share on other sites More sharing options...
Guppy916 Posted July 13, 2018 Share Posted July 13, 2018 Rimmer's don't do one for MK3 GT6 Quote Link to comment Share on other sites More sharing options...
TedTaylor Posted July 13, 2018 Share Posted July 13, 2018 Quoted from Guppy916- Rimmer's don't do one for MK3 GT6 Presumably neoprene gasket. MUT Quote Link to comment Share on other sites More sharing options...
Paul64 Posted August 7, 2018 Share Posted August 7, 2018 I had leaks from an ally one I bought - turns out the mating surfaces weren't a good match at all, especially at the corners. Gave up in the end, chucked it away and went back to the original after it was sand blasted and powder coated. No leaks and looking good! Paul Quote Link to comment Share on other sites More sharing options...
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