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Old 06-09-2002, 08:14 PM
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Post roller lifters????

Can you use roller lifters on a regular flat tappet lifter cam?? Ive called the summit tech line and they say you can't. I know that the roller cams have a more radical slop on the lobes because the roller lifters allow that, unlike regular lifters. but i dont understand why you wouldn't be able to use them on a regular cam. Would it even make a difference??? Some info would be helpful. Thanx
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Old 06-09-2002, 09:30 PM
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nope you cant do it. The lobes are totally different if you look at a roller cam and a flat tappet cam you can visually see the difference in lobe size. Also, roller cams and lifters are made of steel and flat tappet cams are iron. Roller lifters are longer than flat tappet lifters. If you mixted the two eventually the lifters would wear out the cam lobes. Not to mention it would run differently anyways because of the messed up geometry. Just buy a roller cam its well worth it itll add life and subtract friction to you engine.
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Old 06-11-2002, 05:28 PM
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A roller lifter will not work preperly on a non-roller cam for the following reason. A flat tappet camshaft, (hydralic or solid) has a very slight taper across the top of the lobe. This is designed into the lobe when it is manufactured. This small taper causes the lifters spin while the engine is running. You will notice that if running the engine with the valve cover off at higher than idle rpm, the push rods are also spinning. This is designed so that the lifter spins and the same surface point of the lifter does not make constant contact with the same point on the lobe. This engineering design allows oil on the lifter face to lubricate and cool the lifter. Roller cams do not need this design feature, therefore, A roller lifter will quickly destroy a non-roller cam and vise versa.
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Old 06-17-2002, 07:42 PM
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The two types cannot be mixed! A roller lifter contacts the cam at one small point where as a flat tappet lifts from one side of the tappet and lowers on the other. That is why the roller cam lobe appears much wider versus the flat tappet. Mixing the two will give some RADICAL changes in cam timing.
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Old 06-18-2002, 06:04 PM
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Could you mite be thinking roller rockers insted of roller lifters?
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Old 06-18-2002, 06:05 PM
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Could you be thinking roller rockers insted of roller lifters?
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