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Freeform Metal Samba Member
Joined: July 07, 2005 Posts: 128 Location: Oregon
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Posted: Tue Aug 28, 2018 4:47 pm Post subject: Speedwell Ratio Rockers |
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I have purchased a set of ratio rockers from Speedwell. But I need to decide between 1.25 or 1.4. I'm building a 36hp Okrasa motor. I already have a set of Speedwell valve cover so clearance shouldn't be an issue. I'm not looking to get crazy with the motor. I will be using an Okrasa crank also. Can anyone give me feedback on what might work best? I'm leaning toward 1.4, but I don't know if that will bring any build challenges. |
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txoval Samba Member
Joined: January 23, 2004 Posts: 3552 Location: The Woodlands, TX
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Posted: Tue Aug 28, 2018 6:56 pm Post subject: Re: Speedwell Ratio Rockers |
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What cam? Deck hieght? etc
On a stock cam/head engine the 1.4痴 should be ok, but if you change the stroke, cam, deck height you値l need to measure your valve to piston clearance
You値l probably need to lengthen your pushrods to get the correct rocker geometry...WW sells extensions |
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Freeform Metal Samba Member
Joined: July 07, 2005 Posts: 128 Location: Oregon
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Posted: Tue Aug 28, 2018 7:13 pm Post subject: Re: Speedwell Ratio Rockers |
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I should clarify that I知 not building the motor. I don稚 have a cam yet. But will probably go with a performance cam. The Speedwell ratio rockers are in stock so I wanted to buy a set before they are not available. I知 trying to collect most of the parts before the engine is built. After I bought them Ray emailed me asking which ones I want. So I知 hoping someone can school me on the difference. |
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gimmesomeshelter Samba Member
Joined: May 08, 2004 Posts: 1466 Location: San Carlos, CA
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Posted: Wed Aug 29, 2018 10:04 am Post subject: Re: Speedwell Ratio Rockers |
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You need to pay special attention to not binding the valve springs. If .4" is all the lift you can get, the 1.25:1 springs will work with cams that lift up to .320". If you use the 1.4:1 rockers, you're cam can't have lift greater than .285". I'm planning on having a custom cam ground anyway, so I purchased a set of 1.4:1 rockers.
Cheers,
Paul _________________ "I would rather have questions that can't be answered than answers that can't be questioned."
Richard Feynman |
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Freeform Metal Samba Member
Joined: July 07, 2005 Posts: 128 Location: Oregon
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Posted: Thu Aug 30, 2018 12:52 pm Post subject: Re: Speedwell Ratio Rockers |
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Thanks for the reply. It's helps to hear what others are using in there builds. |
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