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Crank build for racing engine
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<blockquote data-quote="greg brillus" data-source="post: 179143" data-attributes="member: 597"><p>Your kind of describing what we are doing with a single and cut twin engines here in Aussie.....It is a work in progress and I have not gone to too much trouble to talk about it on here due to needing more testing time.......Small teething issues which is to be expected with performance mods......Luckily no major blow ups.....we can't afford for that to happen on account of not enough spares to simply replace smashed heads, pistons and so on.......We have gone to using 6 m stem Titanium valves with no step on the stem........Beehive springs with titanium retainers......1.25: ratio needle roller rockers.......5/16" hollow pushrods which are just over 100mm long........Chev 900 base circle race type roller cam with needle rollers in the center no bushes.......our own design roller cam followers........Most all valve train and follower components from an LS Chev........windage set up in the base of the crank case........auxiliary bolt on sump to keep oil away from the crank plus timing chest bypass outlet draining oil directly to this bolt on sump........Using a conventional pressed up crank but running 100 mm stroke at present........next engine will have a one piece short stroke crank, with full oil pressure pump, oil jet under piston.......so on and so on......next major is to design our own cylinder head to increase the port height area and stand the valves up for a shallow combustion chamber, less dome height on piston, so better lighter piston........On it goes......Have ridden the bike a bit but not a lot.......it does seem to go very well.......no dyno figures yet, but soon enough.........Once it has enough "Shake down time" then I will go into more detail.......It is somewhat expensive, but very time consuming.......Madness really, but why not.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 179143, member: 597"] Your kind of describing what we are doing with a single and cut twin engines here in Aussie.....It is a work in progress and I have not gone to too much trouble to talk about it on here due to needing more testing time.......Small teething issues which is to be expected with performance mods......Luckily no major blow ups.....we can't afford for that to happen on account of not enough spares to simply replace smashed heads, pistons and so on.......We have gone to using 6 m stem Titanium valves with no step on the stem........Beehive springs with titanium retainers......1.25: ratio needle roller rockers.......5/16" hollow pushrods which are just over 100mm long........Chev 900 base circle race type roller cam with needle rollers in the center no bushes.......our own design roller cam followers........Most all valve train and follower components from an LS Chev........windage set up in the base of the crank case........auxiliary bolt on sump to keep oil away from the crank plus timing chest bypass outlet draining oil directly to this bolt on sump........Using a conventional pressed up crank but running 100 mm stroke at present........next engine will have a one piece short stroke crank, with full oil pressure pump, oil jet under piston.......so on and so on......next major is to design our own cylinder head to increase the port height area and stand the valves up for a shallow combustion chamber, less dome height on piston, so better lighter piston........On it goes......Have ridden the bike a bit but not a lot.......it does seem to go very well.......no dyno figures yet, but soon enough.........Once it has enough "Shake down time" then I will go into more detail.......It is somewhat expensive, but very time consuming.......Madness really, but why not. [/QUOTE]
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Crank build for racing engine
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