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Nov 21, 2005 13:46:23 GMT
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Right, I'm a bit of a dunce some times... I GET engines, fuel, air and sparky stuff. I am even grokking in it's fullness the wonders of EFi. However there are some oily bits that I just don't know what they do... and why. So here is a little list, any and all explinations gratefully recieved. Camshafts - What do they do? If the crack is the bit the pitsons turn, whats the camshaft doing, and why? Rockers - what are they and why do they have a cover? Tappets!? What is different about a push-rod engine? What other engines are there? There you go, let engineering for the insane 101 commence ...
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Nov 21, 2005 13:51:54 GMT
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Camshaft - pushes the valves up and bown. Either directly on to the valve tops (OHC), or via pushrods.....
Rockers - these are need to convert the push from the camshaft when using pushrods. Cover......well, all heads have a cover on them, it's just for engine with rockers it's called a rocker cover, but it's also just called an engine cover - it's main purpose is stop contamination of the oile / the oil being fired out of the engine all over the bay!
Tappets - these are the connections to the valves. This is the place you need to adjust to get the correct valve lift (normally via shims, but also done by the adjustment on the rockers)
Pushrod engine - rods are need to convert the push from camshaft because it is placed lower than the valves in the head.
Different eninge types - lots, and lots and lots. (I'm sure someone will have a full list.....!)
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Last Edit: Nov 21, 2005 13:53:18 GMT by iRocco
I like long walks, especially when they're taken by people I don't like.
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Nov 21, 2005 13:54:36 GMT
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Nov 21, 2005 13:57:53 GMT
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Aha ,.. fantastic ,.. so it's all related to opening and closing valves.. Something I've never really touched on (although I probably should) .. This is v. useful : auto.howstuffworks.com/engine7.htmThanks all
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Nov 21, 2005 14:01:52 GMT
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Camshafts open the valves, so named because they are a series of Cams on a shaft, normally one cam per valve. These can be direct acting on Bucket tappets, directly on the Valve stem. Or in the middle of Rockers to give some mechanical advantage to valve opening Or sit in the block, acting on followers and pushrods transferring the force upwards (Sideways on a VW) to one end of a rocker, the other end on the valve. The Camshaft is driven at 1/2 Crankshaft speed. Rockers: see above Rocker covers: start an engine without one on (It wont hurt it and it wil become very obvious) to see why they are fitted. Other engines: 2 strokes... my faves ;D only 3 moving parts in a traditional 2 stroke and they fire twice as often as a 4st Rotaries, NSU, Mazda, Norton.....do a search on Wankel Gas turbines (jet engines) there will be some more along in a minute I`m sure but that should get the ball rolling Try www.howstuffworks.com and search for internal combustion engine.... that will give you some good basics. I`ll see what else I can find on fundamentals, J or Racer should have some better links though
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Nov 21, 2005 14:03:02 GMT
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darn;D Beaten to it ;D
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Nov 21, 2005 14:12:35 GMT
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......well, all heads have a cover on them, it's just for engine with rockers it's called a rocker cover, but it's also just called an engine cover - it's main purpose is stop contamination of the oile / the oil being fired out of the engine all over the bay! Not all engines have rocker covers... but then the pilot of this Avro gets a face full of oil when he goes for a flight ;D You can clearly see the rockers on top of the engine & the pushrods connected to them.
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Nov 21, 2005 14:15:25 GMT
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......well, all heads have a cover on them, it's just for engine with rockers it's called a rocker cover, but it's also just called an engine cover - it's main purpose is stop contamination of the oile / the oil being fired out of the engine all over the bay! Not all engines have rocker covers... ....all car engines do though....
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I like long walks, especially when they're taken by people I don't like.
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Nov 21, 2005 14:22:57 GMT
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Not all engines have rocker covers... ....all car engines do though.... Except Flatheads of course ;D
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Nov 21, 2005 14:31:01 GMT
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Not all engines have rocker covers... ....all car engines do though.... DD goes off hunting for a picture of the old Fiat (I think) Racer that was at Goodwood FOS a few years ago with externally visible rockers - and very oily bodywork
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Nov 21, 2005 14:37:29 GMT
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Morgan 3 wheeler with a J V-Twin....... Exposed valetrain with hairpin valve springs and total loss lubrication system......... Faster round Mallory Park than a Sierra Cosworth Well for th e1st 10 laps while you can still see where your going After that it becomes a losing battle with the oil mist on your goggles ;D ;D don't whatever you do be tempted to wipe them ;D
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Last Edit: Nov 21, 2005 14:39:06 GMT by CR500Dom
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Nov 21, 2005 14:47:18 GMT
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J V-Twin was a plane enigne first though wan't it.....?
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I like long walks, especially when they're taken by people I don't like.
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ImpManiac
Part of things
Imps... Imps... Imps...
Posts: 868
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Nov 21, 2005 16:34:03 GMT
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J V-twin was a bike engine first, I believe. Some of the vintage and veteran machinery had exposed valve gear, notably the motorcycles and aero-engined cars - lovely, thundering monsters that they are! ;D Vanwalls and quite a few 1950s racing engines used hairsprings for valve closing. They were trendy back then! They are effective but sensitive to speeds and resonances, I gather and therefore somewhat fragile compared to coil springs. (Or so I read in Classic Racing Engines by Carl Ludvigsen - a great bedtime read! ) I'm
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1966 Singer Chamois sprint/hillclimb car in white over blue two tone 1975 Triumph Stag long term project (over 20 years so far) in colour TBA 2003 Vauxhall Vectra GSi 3.2 in black sapphire
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GJM
Posted a lot
Alloy engines; like communism- great in theory.
Posts: 1,393
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Nov 21, 2005 17:16:34 GMT
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Nov 21, 2005 17:19:04 GMT
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Either a belt or chain from the crank......
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Last Edit: Nov 21, 2005 17:19:17 GMT by iRocco
I like long walks, especially when they're taken by people I don't like.
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Elementry engine questionsslater
@slater
Club Retro Rides Member 78
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Nov 21, 2005 17:21:50 GMT
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Cam is turned by either a belt or chain drive from the crankshaft.
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GJM
Posted a lot
Alloy engines; like communism- great in theory.
Posts: 1,393
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Nov 21, 2005 17:22:35 GMT
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oh course, d'uh stupid me. Took me half an hour to take the timing chain off the cam on the Imp
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Nov 21, 2005 17:22:45 GMT
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Cam is turned by either a belt or chain drive from the crankshaft. Think there's an echo in here......... !
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I like long walks, especially when they're taken by people I don't like.
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Philj
Part of things
Posts: 898
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Nov 21, 2005 17:26:10 GMT
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So what turns the crank?
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Elementry engine questionsslater
@slater
Club Retro Rides Member 78
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Nov 21, 2005 17:39:44 GMT
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The pistons going up and down
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