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greek_tony
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Joined: February 12, 2013
Posts: 243
Location: Athens, Greece
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 Posted: Sat Oct 31, 2020 3:27 pm Post subject: Sport camshaft and ratio rockers |
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I've decided to go a different way with the engine in the oval. Sold the speedwell supercharger and going to use some parts I have to build a twin port 1400 with twin weber 36 or 40 idf.
I've got the okrasa heads, 80mm pistons, 69.5mm crankshaft etc... and also speedwell 1.4 to 1 rockers or AA 1.15 to 1 rockers.
I'm looking at either a WW okrasa cam or BBT okrasa cam. I've seen people using the cams with 1.15 to 1 rockers but not with 1.4 to 1. Will they work?
Thanks
Tony
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1963 Karmann Ghia - Sold
May 53 Ragtop - Resto started
October 65 Fastback - Almost there. |
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greek_tony
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Joined: February 12, 2013
Posts: 243
Location: Athens, Greece
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| Posted: Mon Nov 02, 2020 1:56 am Post subject: Re: Sport camshaft and ratio rockers |
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Actually, just clarifying. What is the maximum lift I am allowed from the cam with 1.4 to 1 rockers?
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Alstrup
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Joined: July 12, 2007
Posts: 7212
Location: Videbaek Denmark
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| Posted: Mon Nov 02, 2020 5:38 am Post subject: Re: Sport camshaft and ratio rockers |
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That depends on the heads, oir rather how much lift the springs can handle. IIRC the WW Okrasa heads with the installed springs can handle about 11 mm (0,435") out of the box, so the BBT 1621-91 would be a good choice with 1,4 rockers.
Just remember to give the engine some CR. At least 8,5-1, then it can work well.
36 IDF or Dellorto will be plenty. No need for 40īs.
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greek_tony
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Joined: February 12, 2013
Posts: 243
Location: Athens, Greece
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| Posted: Mon Nov 02, 2020 6:08 am Post subject: Re: Sport camshaft and ratio rockers |
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| Alstrup wrote: |
That depends on the heads, oir rather how much lift the springs can handle. IIRC the WW Okrasa heads with the installed springs can handle about 11 mm (0,435") out of the box, so the BBT 1621-91 would be a good choice with 1,4 rockers.
Just remember to give the engine some CR. At least 8,5-1, then it can work well.
36 IDF or Dellorto will be plenty. No need for 40īs. |
Mange Tak Alstrup!
Good to know about the lift that the springs can handle. So it looks like the BBT Okrasa may be the one to go for.
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Alstrup
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