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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Molnar question
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<blockquote data-quote="Monkeypants" data-source="post: 177303" data-attributes="member: 2708"><p>I have Molnar cases on the 1360 engine. They are excellent. I had no problem fitting the Alton.</p><p>The big bearing size is for the use of a crankshaft with oversized mainshafts. This can be done when building an engine designed for high rpm. The standard crank is good for 5500 rpm but not continously ( see Picador testing)</p><p>The crank in the 1360 uses 30 mm mainshafts whereas the standard crank has 1" mainshafts. The TP crank that I used is designed for up to 7000 rpm use. That matches well with the MK5 cams which hit max power at 6500 rpm.</p><p></p><p>The bearings that fit the 30mm shaft are 72 mm OD. Standard bearings are much smaller in OD.</p><p> The Molnar cases are greatly thickened in the main bearing area, so it's no problem to machine out for the big bearings. If you tried that with original cases there would be no material remaining to hold the 72mm od bearings.</p><p>I used bearings of a different configuration but the same spec and size as the Norton Commando Superblends that solved a big problem on the 750 Commando. The bearings are rated for 11,400 rpm.</p><p></p><p>Glen</p></blockquote><p></p>
[QUOTE="Monkeypants, post: 177303, member: 2708"] I have Molnar cases on the 1360 engine. They are excellent. I had no problem fitting the Alton. The big bearing size is for the use of a crankshaft with oversized mainshafts. This can be done when building an engine designed for high rpm. The standard crank is good for 5500 rpm but not continously ( see Picador testing) The crank in the 1360 uses 30 mm mainshafts whereas the standard crank has 1" mainshafts. The TP crank that I used is designed for up to 7000 rpm use. That matches well with the MK5 cams which hit max power at 6500 rpm. The bearings that fit the 30mm shaft are 72 mm OD. Standard bearings are much smaller in OD. The Molnar cases are greatly thickened in the main bearing area, so it's no problem to machine out for the big bearings. If you tried that with original cases there would be no material remaining to hold the 72mm od bearings. I used bearings of a different configuration but the same spec and size as the Norton Commando Superblends that solved a big problem on the 750 Commando. The bearings are rated for 11,400 rpm. Glen [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Molnar question
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