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Roller tip rocker arms

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Mike

07-01-2002 20:56:57




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Is anyone aware of a mfg. for roller tip rocker arms for trators? Thanks in advance for your help.




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Jeff Asbury

07-18-2004 12:39:31




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 Re: Roller tip rocker arms in reply to Mike, 07-01-2002 20:56:57  
OK guys I'll try to make this somewhat simple. 1st: The frictional horsepower gain of a roller tip rocker in an antique puller is minute. But the SCRUBBING effect is virtally eliminated therefore greatly reducing valve guide wear. 2nd: The additional valve lift is a side affect of increasing the ratio and in 95% of the time not of any benefit. 3rd: What we are after and accomplish is more area under the lift curve. Let me explain: Any cylinder head Chevy, Ford, IH, Allis,JD,Oliver,Moline,ect,ect when put on a flow bench will flow more air .100 valve lift than at .050,more at .200 than .100 and so on. In the tractor world most heads peak out air flow at .450 to .550 valve lift. We have put some lifts in the .700 lift range but not on purpose, that was just a side affect of changing the ratio. What we are after is the AREA UNDER THE CURVE. We want to get to .050, .100, ect valve lifts earlier in the cycle and delay to those numbers later in the cycle. Lastly: We keep pushrods in the stock location where necessary to eliminate clearance issues. The rockers do not delete the purpose of a reground cam, nor does the reground cam delete the purpose of the high ratio rockers. We have had reports of as little as 3 or 5 horsepower gains to as much as 30. A 10% increase is not uncommon. When you only have 40 horsepower and you can bolt on 5 in an afternoon, well you be the judge!!!I hope this helps. Jeff Asbury

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Pete1468

07-02-2002 15:41:57




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 Re: Roller tip rocker arms in reply to Mike, 07-01-2002 20:56:57  
Murphy's Motor Service is the only place to get them that I know of. They worked very good on my M and I would recomend them to any one, even on a stock cam.



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Flyin Farmall

07-02-2002 20:46:44




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 Re: Re: Roller tip rocker arms in reply to Pete1468, 07-02-2002 15:41:57  
Pete,do you think they are really worth the $350.00 on a relatively stock motor??biggerbore,same stroke??just wondering.



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Pete1468

07-03-2002 16:08:23




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 Re: Re: Re: Roller tip rocker arms in reply to Flyin Farmall, 07-02-2002 20:46:44  
Well, on a 450 ci engine they made about 1/2 a gear difference than stock rockers with the same cam. I noticed increased throttle response and more lug out of the engine. I was one of the first to purchase them and they were $425 I think and well worth it to me. That's much cheaper than stroking a crank and are real simple to install.



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DON LC

07-02-2002 10:34:15




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 Re: Roller tip rocker arms in reply to Mike, 07-01-2002 20:56:57  
Roller,rocker arms are to be run on roller cam shafts ....unless you are going to be turning 7000 RPM or more they whould be a waste of money.....



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Dale13

07-03-2002 04:52:53




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 Re: Re: Roller tip rocker arms in reply to DON LC, 07-02-2002 10:34:15  
I think thats roller lifters that have to be run on roller cams,question is on roller rockers.



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G-MAN

07-03-2002 05:57:14




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 Re: Re: Re: Roller tip rocker arms in reply to Dale13, 07-03-2002 04:52:53  
I think you're right, Dale. Roller cams generally have steeper ramps and a more radical lobe profile - a lot of them look like the lobe is a complete oval, rather than being more pointed. This allows them to open the valve much quicker and increase the duration. And you have to have a roller on the lifter to be able to follow the lobe properly. I know you don't have to have a roller cam to run roller rockers, as I have installed them on small-block Chevy's before with no cam change. Someone posted that the gain is not from friction advantage, but from increase ratio. I believe this is also incorrect, as you can get roller rockers in the same ratio as stock ones - it's all in how they're machined. They sure won't gain you 50 hp, but when you're dealing with a 50 hp engine, even a 2 hp gain is substantial.

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G-MAN

07-03-2002 12:43:06




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 Re: Re: Re: Re: Roller tip rocker arms in reply to G-MAN, 07-03-2002 05:57:14  
Mike, I think you misinterpreted my post and I did the same with yours. I know we're talking about pulling tractors and I assumed that you could get the same ratio in a roller rocker for tractors, but obviously I was mistaken. My post was intended to keep people from getting the idea that you had to have an increased ratio to get a benefit from ANY type of roller rocker - for tractors or cars, as the other benefits are decreased wear and increased performance, although they won't make a monster out of an engine by simply installing them. Sorry about the mix-up.

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Mike in Mo

07-03-2002 11:50:21




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 Re: Re: Re: Re: Roller tip rocker arms in reply to G-MAN, 07-03-2002 05:57:14  
G-MAN you are correct about roller rockers being available in stock ratio--- on car engines. Murphy's rockers are increased ratio. I just assumed we were talking about pulling tractors, not cars. Mike



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Mike in Mo

07-02-2002 19:31:53




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 Re: Re: Roller tip rocker arms in reply to DON LC, 07-02-2002 10:34:15  
The reduced friction loss isn't the advantage, it's the larger ratio that results in more valve lift . Mike



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G-MAN

07-02-2002 10:57:38




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 Re: Re: Roller tip rocker arms in reply to DON LC, 07-02-2002 10:34:15  
I will agree that it's probably wasting money to install them on a mild pulling engine. But they are not designed just for roller camshafts. Roller-tip rocker arms were available and popular long before roller cams became the rage. They will save horsepower in any application, due to reduced friction, and also greatly reduce guide, valve tip and rocker wear due to the reduced "scrubbing" action of the rocker over the valve end, which increases durability. I'm sure they are quite expensive for most old tractor applications, but for more common engines, say a small-block Chevy, you can get the roller-tip stamped rockers for very little more than new stock rockers.

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fullpullking

07-01-2002 21:30:21




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 Re: Roller tip rocker arms in reply to Mike, 07-01-2002 20:56:57  
Murphy's motor service makes them for nearly everything. They aren't cheap. 573-696-3655



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