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N-V did try to do a dohc 750, but what a maintenance nightmare it would have been. To save money (OF COURSE!!), they decided to run the cams by chain, off the existing cam drive. The chain ran up the forward existing push-rod tube, across the head through a couple of idler sprockets to get enough wrap of chain round the sprockets on the camshafts, then back down the aft pushrod tube. There were also a couple of idler pulleys inside the timing case. That chain was over 3-feet long! I don't think the ohc layout did much for the power output.I remember doing some dyno work with it just about the time I left, but don't remember any details.
N-V did try to do a dohc 750, but what a maintenance nightmare it would have been. To save money (OF COURSE!!), they decided to run the cams by chain, off the existing cam drive. The chain ran up the forward existing push-rod tube, across the head through a couple of idler sprockets to get enough wrap of chain round the sprockets on the camshafts, then back down the aft pushrod tube. There were also a couple of idler pulleys inside the timing case. That chain was over 3-feet long! I don't think the ohc layout did much for the power output.
I remember doing some dyno work with it just about the time I left, but don't remember any details.
