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MG MGA ROLLER ROCKER KIT BBS discussion at MG-Cars.net
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MG MGA - ROLLER ROCKER KIT
| Is somebody can tell me the advantage to have Roller rockers ? Maybe the noise from engine would be less and adjustement easyer for valve . Somebody have try it on MGA's ? Thank's Jules MGA MKII 1962 |
| Jules |
| The only advantage on a street engine is that it lightens your wallet (considerably!) thus preventing you from wasting the money on even more foolish add-ons! ;-) |
| Bill Spohn |
| Hi Jules. Roller rockers usually provide a bit more valve lift than regular rockers, which improves engine breathing, and can (under certain circumstances) help produce more horsepower. Roller rockers also reduce valve train friction a bit, which contributes to engine efficiency and reduced wear on some valve train components. Roller rockers, in an otherwise unmodified engine will give only a minimal performance increase. When used with other (expensive) engine modifications, performance increases through it's use should be more noticeable. Roller rockers are essentially for use in highly modified racing engines. Roller rockers are not cheap, and for normal driving are in my opinion, likely a waste of money. There are better and cheaper ways of getting a bit more power out of B series engines that are more conducive to "hobbyist" driving and budgets. Cheers! GLenn |
| Glenn |
| Hi Glenn , Thank you very much for your well describe explanation. Jules. MGA MKII 1962 |
| Jules |
| Hi Jules. No problem. Cheers! GLenn |
| Glenn |
| Jules - are you east or west coast? If you are out here in the west, there are lots of people that can help you with economical improvements to the engine. Or suggest where you can find a 3 main B engine to play around with! |
| Bill Spohn |
| Hello Bill , I am from Sherbrooke , Québec . I Just have another 1600 MkII engine with only 20,861 miles on it , in process to be rebuilt and i just want to give it the best enhance parts to make it more quiet . I try to adjust valves on the engine presently in the car , and i can't reduce the noise from the valves . And i have another problem with oil burning with cylinder #4 , because 12 years ago when the machine shop rebuilt it , they put a sleeve inside that cylinder and the ring maybe glaze the cylinder wall , so it burn oil and a blue smoke is seen in compression . Any better idea ? Jules . MGA MKII 1962 |
| Jules |
| Also which has not been mentioned, is that Roller Rockers allow you to rev the engine a little more. With the extra Ratio 1.6 as apposed to 1.4x from memory the valve springs are compressed more thus allowing higher revs. The down side to this is more cam ware though. I have used offset bushes in the conventional rockers before now giving the same ratio at 1/10 the price. As for oil burning. What are the compression's wet and dry ? This will tell you if it's the head or the rings. Thanks <MARK> |
| Mark Hester |
| See;Dr. Martin G. Ferrillo 102 Brixton Rd. South martingf@aol.com For both gear reduction starters and Harland Sharp roller rockers. Safety Fast Dwight |
| Dwight |
| OR Direct !!! http://www.harlandsharp.com/custom3.htm No price shown though. |
| Mark Hester |
| try and aluminum valve cover. this will help quiet significantly. |
| John |
| Jules, if your rocker arm shaft or rocker arm bushings are worn you can adjust your valves all day long but they will never be quiet. John |
| J.H. Hall |
| Jules-- Nobody has mentioned Peter Burgess's book here yet, so I guess I better--if you're going to spend that kind of dough on a B engine, that's required reading. He explains in detail how various improvements affect performance, and in what order it makes the most sense to add them. As I recall, there are a lot of things to do before you get to roller rockers. It's called "How to Power Tune the MGB Engine" or something to that effect, and Moss and others carry it. It applies well to MGA engines, too. I'd look it over before writing any big checks. John V. |
| John Vallely |
| Does anyone know where to obtain the solid spacers that are usually used to replace the rocker positioning springs when converting to roller rockers? I've seen them advertised with a complete conversion kit, but have not yet found a source for just the spacers. Thanks, Steve |
| Steve Brandt |
| you mean these from Moss. http://www.moss-europe.co.uk/MossUK/ProductList.aspx?SubSubCategoryID=TR2_UKTRI-254 Type in Rocker spacer and you get loads of part numbers like CAEG392 TT1018 plus others,,,, but they don't show the application, so they must fit most B series stuff. <MARK> |
| Mark Hester |
| Hi Jules, If you are looking to get a smoother running engine I can recommend the roller rocker kit manufactured by the Australian company YellaTerra and being offered by Hans Pedersen (www.hi-flow.com). I fitted this piece of kit in my MGB last week after years of unsuccessfuly trying to get the engine to run smoother/quieter. I can honestly say that it has transformed the engine noise level/smoothness with a definite increase in power noticable - probably from the slightly higher lift (1.5:1). The kit also replaces the rocker shaft and pedestals with a complete new design so may not be for purists. I fitted it in a couple of hours and didnt remove the head. The down side is that it is fairly expensive but is a comprehensive kit. On your 1622cc MGA engine you need to check with Hans wether it will fit. rgds Brian |
| Brian Reeves |
| All information that all of you give me is very helpfull . The noise comming from valve is very unpleasant. I had replace rocker shaft , rockers with new bushings and nothing better than a lots of "clicking". When i started the engine , i hear thoses valves clicking and if i rev it , nothing until it rev down . So i really don't know where it came ( Lifters ???? ) . Thank's Jules MGA MkII 1962 |
| Jules |
| If there is wear at the cam to lifter surfaces it could cause noise, though the noise would be lower in engine. do you have a stethescope? if not use a long screwdriver pressed to your ear to listen in different areas of the engine. Randy |
| R J Brown |
| Hi Jules. All MGA engines have SOME tappet noise! This is inescapable because our engines use solid lifters and not hydraulic ones. For people that are used to modern (quiet) engines, our old B series engines sound like they are diesel Engines! If your engine has really excessively loud tappet noise, then I would begin to suspect that either the valve clearances havent been set correctly using the proper procedure, or perhaps there is significant wear on the working ends of your rocker arms, or perhaps excessive wear or damage on other (internal) engine parts. Correctly setting valve clearances on the B series engines is kind of tricky for the uninitiated, and requires following a specific procedure. If this valve adjustment procedure is not followed, then the tappets can INDEED be EXTREMELY noisy! My question is: Who adjusted your valves, and did that person know and follow the proper adjustment procedure? If you don't know, then I think you should have the valve clearances checked and adjusted by someone well versed in the process. Just my 2 cents worth . Cheers! Glenn |
| Glenn |
| Also if you take the rocker cover off and run the engine does it spray oil everywhere. Cover the car with old sheets first though... If not, you may have a blocked oil line and no or very little upper engine lubrication. Or possibly the wrong rocker shaft pedestals from a late MGB offset car. Oil lubrication will significantly effect the sound. I run Mini lifters and 18v pushrods myself as they are much lighter and cheaper to replace. I replace the lifters every year and cam's are expensive. Takes less than 30 mins to change them. Cheers <MARK> |
| Mark Hester |
| Jules, if you find that everything is correct and working properly but are still bothered by the noise you could try a trick that was used by Harley Davidson from 1948 to 1965. They glued a piece of hard felt to the inside of the rocker covers on what was refered to as the "panhead engine" to reduce rocker noise. You may still be able to buy it from a Harley dealer or aftermarket company. |
| John H |
| These seem allot cheeper that the Moss and Yello Terra options. http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&ru=http%3A%2F%2Fsearch.ebay.com%3A80%2Fsearch%2Fsearch.dll%3Fcgiurl%3Dhttp%253A%252F%252Fcgi.ebay.com%252Fws%252F%26fkr%3D1%26from%3DR8%26satitle%3D4572446776%26category0%3D%26fvi%3D1&item=4572446776 <MARK> |
| Mark Hester |
| Hi Jules, when you rebuilt the rocker shaft assy. you did drill out the oil holes in the rocker bushings. John |
| J.H. Hall |
| Hi J.H., Yes when I rebuilt the rocker shaft assy , I drill out these hole and at the same time just enlarge them a bit to ensure better lubrication .So when I run the engine without valve cover , both wings and engine bay is full of oil spits . Thank's Jules MGA MkII 62 |
| Jules |
This thread was discussed between 19/08/2005 and 03/09/2005
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