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bngt
Drag-strip hero
Posts: 202
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Post by bngt on Dec 14, 2017 21:15:34 GMT 1
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bngt
Drag-strip hero
Posts: 202
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Post by bngt on Dec 14, 2017 21:21:02 GMT 1
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Post by dusty350 on Dec 14, 2017 21:30:01 GMT 1
There is a member on here - Cinder - who built an Lc700 that was featured in a Practical Sportsbike magazine. Some great engineering ! Dusty
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Post by 4l04ever on Dec 14, 2017 23:08:39 GMT 1
I think the TZ750 engine casings have been remade, but would be very expensive.... How about using the Mattoon billet casings??? www.mattoonmachine.com/Billet_Cases.htmlYou can get upto 1815cc in the 4 cylinder version!
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bngt
Drag-strip hero
Posts: 202
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Post by bngt on Dec 14, 2017 23:24:12 GMT 1
Price $4300!
I plan a cheapo build. No fun otherwise. I know it won't be cheap in the end but I'd like to fabricate myself and use cheap parts.
Pictures from Cinders build would be nice. Especially if one could see parting lines etc.
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Post by donkeychomp on Dec 14, 2017 23:31:48 GMT 1
Didn't Stan make one yonks ago or am I recalling the old April fool issue of Bike?
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Post by dusty350 on Dec 15, 2017 9:05:38 GMT 1
I'll see if I can find the mag. You could message him on here - username Cinder - real name Graham I believe Dusty
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Post by dusty350 on Dec 15, 2017 9:40:01 GMT 1
Practical Sportsbikes -December 2013 Dusty
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Post by jon on Dec 16, 2017 9:56:15 GMT 1
I think the TZ750 engine casings have been remade, but would be very expensive.... How about using the Mattoon billet casings??? www.mattoonmachine.com/Billet_Cases.htmlYou can get upto 1815cc in the 4 cylinder version! Rob, although you could move the engine mounts about on say an LC frame, I doubt this type of case is suitable for a bike. Sure for a banshee it’s fine. I suspect the weigh imbalance of the gearbox section would make for a poor handling bike. Jon
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Post by yamark on Dec 17, 2017 15:19:21 GMT 1
Hi bngt, I've never seen that picture of a 750GL as I've never heard of it. I assume it was a prototype that never saw the light of day.
The second picture shows air cooled crankcases with steel bars in position (crank and gearbox) ready to be welded. The bars are obviously removed once the welding is complete. The top engine mounts have been removed as the A/C engines have a lower rear engine mount (from memory).
The third picture, I think, IS Graham's engine cases.(I could be wrong - but I think I recognise Harry's workbench). Two LC cases and a YPVS section for the clutch actuation.
If you joined 2 YPVS cases, the hardest part I feel would be getting the power valves to work and line up. You have many options to decide before cutting and welding.
The TZ750 has a unique set up and engines sell for loads of "beer tokens"!
I chatted to Harry at the Stafford show, and we reckon there are between 3 to 7 LC fours, 3 or 4 LC triples. 1 of each in the A/C I also seem to remember that one of those LC fours has A/C crankcases. Every LC multi cylinder appears to be slightly different in some way. My clutch actuation and outrigger section is different on my triple compared to Harry's triple.
Hope that helps - Mark
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bngt
Drag-strip hero
Posts: 202
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Post by bngt on Dec 17, 2017 16:03:15 GMT 1
Thank you! Absolutely helpful. I am trying to navigate this world and I feel that while it is fun to come up with your own design it would be stupid not to learn from those who have made previous attempts. A TZ 750 with Athena or similar cylinders could be smart and possibly reliable. I don't know where to get a TZ crankcase at reasonable price though. I don't feel that maneuvering the power valves should be that difficult. Either you connect all of them which should be the easiest or you put a drive on either side. However I think the best would be to run CPI 421 or similar. I also wonder if one could order the crank from Hot Rods if one sent them a drawing. I also wonder if it would work to make the bore spacing equidistant. The TZ has larger spacing in the middle but not the others. I'll have a look at my 472 cylinder when I get it in January to see if there is an opportunity to put two siamese cylinders close. Maybe a stronger gearbox will be needed but they do exist for Banshees so maybe that could wait until the first one is crunched. When I was nine I had a poster of a 750 GL in my boy room. hooniverse.com/2011/06/28/two-wheel-tuesday-yamaha-gl750/
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bngt
Drag-strip hero
Posts: 202
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Post by bngt on Dec 17, 2017 16:06:37 GMT 1
A square four so it doesn't really count. I think in-line four will be the simplest. One possibility would be to run mid cylinders reversed to get more room for expansion chambers. The TZ has very awkward pipe routing.
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bngt
Drag-strip hero
Posts: 202
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Post by bngt on Dec 17, 2017 16:13:06 GMT 1
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Post by botty on Dec 17, 2017 16:57:53 GMT 1
Have you considered having 2 forward and 2 rear facing cylinders V4 ish ?? Well not V4 at all.
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Post by hudtm60 on Dec 17, 2017 19:56:11 GMT 1
Millyard is at it...
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Post by kostas on Dec 17, 2017 20:51:46 GMT 1
Cool engineering there, According to the magazine (read under the picture of the crank) they even fitted a camshaft on a 2stroke engine!
Amazing stuff there..
Kostas
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bngt
Drag-strip hero
Posts: 202
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Post by bngt on Dec 17, 2017 21:05:22 GMT 1
LOL! A bit confused, are they!
...and Allen just had to use Kawasaki crankcases with LC-cylinders or it wouldn't be a challenge!
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