I would say with a 290 cam and 1.3s (377 at valve) to be safe from float you need go for 40lb duals if you are going to let it rev, ie approaching the 8,000 rpm mark.
I have found a supplier of liners to convert a gx200 to a 3" bore, how do you remove the old liner, is the block cast around the liner during manufacture, or is it pressed in after, do you have to machine the old liner completely away. Could anyone shed any light on this for me please.
Jonboy
My rockers come from parsons racing, advertised as 1.12:1 ratio, but actualy come out at 1.10:1, not far off, giving me 320" lift measured at the valve.
If I used the 26lb springs, for less cam wear, what would you say it could rev to without float?
With 320" lift at the valve (290 cam & 1.1 rockers), and 26lb springs, what revs could you go to before float starts to happen? I have some 40lb duals but wondered if they would be overkill.
I suppose what i meant to say is, what is the most amount of lift I could go to, using the 285 cam and various ratio rockers, to avoid valve float at 7500 rpm, with 26 Ib springs? ie: 1:1 285"lift 1.12:1= 320"lift 1.2:1= 340"lift etc.
in short, what ratio rockers to...
I have an NR 285 cam in my gx200, larger 28.5mm inlet valve, 26lb springs. Will not be letting it rev over 7500 rpm(max). With this rev limit and these components, what would be a safe amount of lift, meaning how much ratio dare I put into the rockers with these springs.
Regards.
Recieved my new 290 lift cam for my GX200, but where the lobes have been built up and re-ground there is pitting in the finished surface on both inlet and exhaust, as if there was little inperfections in the building up process.
Is this normal when buying these built up cams or should i send...
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