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You have to cut whatever you can even just a little till the surface is in the right location. |
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This wall I made flat from the entry to the wide area of the liner at the bore. Really theres some bumps where the intake splits going in and down so a minimum of material removed makes the tight spot in the intake a shade bigger.
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Theres a lot of variation in the casting and liner rotation. You can see light under the file on this side but its flush on the other. If you were to cut the left and right sides of the liner the same distance from centerline till they all cleaned up the same and blended the long intake wall to it. It would open the intake quite a bit without removing much metal. |
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This shows the 4 ways air gets in. The main flow goes straight in and under the piston and rising collum of air. The air going down and forward is partially blocked by the bottom of the cylinder. Much of that goes between the crankwheels the rest around the cylinder into the transfer area. I cut the extra intakes because its a short straight path to the transfer area.
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Not a great pic of it but the cylinder blocks some of the air that could go down and forward. |
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I'll make a nice radius around the bottom.
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I didn't want to narrow the bridge and loose any piston support but I did flatten the sides from the leading radius to the liner. |
