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Jerry Howell's V 4 4 cycle engine

help please

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ian j20/05/2019 20:01:58
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Hi.

After some advice please.engine block drawing.jpg

I've just started to build the V4 to Jerry Howell's plans.
I've made a start on the engine block and am at the point of boring the cylinder bores. In the build notes Jerry suggest mounting the block on a rotary table with the bottom face horizontal at the top and then rotating it 135* degrees and machine the first cylinder bank then rotate 90* and machine the second . Bit of a silly question but is this the same as having the top face at the top (horizontal) and rotate the table 45* for one bank and then back 90* for the second? because rather than mount the block on the RT I was thinking of mounting it on an angle plate and using a angle gauge to set it horizontal and then 45* each way. Also I don't understand the 1.546" measurement on sheet 8 it's to/from a point in thresh air?
Thank you

JasonB20/05/2019 20:17:56
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yes it is the same, the advantage of using the rotary table is that bot sets of bores will line up with the axis of rotation which could still be done with suitable marking out.

The dimension is from one edge of the right cylinder bank to the left cylinder bank but with a longer dimension line

ian j20/05/2019 23:26:35
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Thanks for that Jason.

So the rotary table method is best because once the engine block is centred on the RT both cylinder banks will be aligned with the crank centre.

JasonB21/05/2019 06:55:12
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You could also locate affixed pivot on the angle plate so that the block rotated around that and then use your angle box to set the required angles.

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