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Post by yamark on Aug 12, 2018 11:48:22 GMT 1
Many of you will know that I've been planning a 4 cylinder LC for a while. I started to think about a 700cc LC midway through the triple build, and have been parts collecting for a while now.
The plan is - LC frame, spread 20mm at the swingarm, early R6 forks (RWU) and brakes, Honda NC29 swingarm. 4 cylinder transverse engine, using 2 LC crankcases, and a YPVS section for the clutch actuation. I've decided not to go 180 (big bang) firing order, but have opted for 90 degree bangs instead. I wont be making my own generator and ignition system myself this time .
While this latest creation will not be as elegant as the 550 triple, it should be a beast. The engine will stick out an extra 4 inches on both sides compared to standard!
I must be "off my head" doing this again
Cheers, Mark
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Post by dusty350 on Aug 12, 2018 13:58:58 GMT 1
Hi mate Great - I've been waiting for you to start this thread I've been down to Coral's to place my bet - 2019/2020 SBOTY winner !! Gonna be another awesome special. I'm gonna be clearing a load of Lc stuff out soon to make room in the shed, so if there is anything you need Hope all is good mate Dusty
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Post by veg on Aug 12, 2018 15:03:39 GMT 1
You absolute legend. I remember the April fools spoof that was in the press in the 80βs where they made a Tamiya plastic model kit with a 4 cylinder engine. I canβt wait to see how this progresses.
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Post by midlifecrisisrd on Aug 12, 2018 17:04:31 GMT 1
This is like my ultimate build
One day I'll build a 4 cylinder ypvs
Can't wait to see this
I saw an lc one at Mick Abbeys. WOW
Steve
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Post by yamark on Aug 12, 2018 19:48:46 GMT 1
Cheers Dusty, the SPOTY comment made me spray my tea over my computer I'll get that parts wish list sorted soon then. Speak soon mate.
Thanks Veg, I remember that April fool as well, it was just before the RD500 launch I think. 4 cylinder LC's have been done before, but I reckon only about 5 or 6 in the UK - unless someone knows for sure. The Mark Crisp one was one of the first, the Stan Stevens one and of course Graham Kings. I know another Forum member is building one, but waiting for his engine cases to come back from Harry.
Steve, I've seen Grahams 700 with the bodywork removed, the engine is immense . I hope you build a 4 cylinder YPVS - I might build a YPVS next, but can't decide on a triple or a 4.
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Post by Tobyjugs on Aug 12, 2018 20:23:45 GMT 1
Looking forward to this thread, go big bang I dare youπ
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Post by risolc on Aug 12, 2018 21:36:09 GMT 1
Sunday night story back on--something to look forward toπ
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Post by donkeychomp on Aug 12, 2018 21:43:07 GMT 1
Oh my oh my oh my. I'm getting more popcorn in, can't wait to see this happen.
I'd say good luck Mark but there is no need, I know you can do it!
Alex
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Post by shaunthe2nd on Aug 12, 2018 22:33:56 GMT 1
Bloody hell, I admire anyone with the talent and imagination to try something like this. Good luck with it and keep us informed. Thanks.
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Post by 4l04ever on Aug 13, 2018 7:39:57 GMT 1
Cheers Dusty, the SPOTY comment made me spray my tea over my computer I'll get that parts wish list sorted soon then. Speak soon mate.
Thanks Veg, I remember that April fool as well, it was just before the RD500 launch I think. 4 cylinder LC's have been done before, but I reckon only about 5 or 6 in the UK - unless someone knows for sure. The Mark Crisp one was one of the first, the Stan Stevens one and of course Graham Kings. I know another Forum member is building one, but waiting for his engine cases to come back from Harry.
Steve, I've seen Grahams 700 with the bodywork removed, the engine is immense . I hope you build a 4 cylinder YPVS - I might build a YPVS next, but can't decide on a triple or a 4. Build a YPVS 4-cylinder, then you can fit two big bore top ends! :-) Maybe a pair of 410cc Athena kits?
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Post by bezzer on Aug 13, 2018 7:41:49 GMT 1
Great to hear itβs begun Mark, looking forward to your updates, another stunning machine in prospect.
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bngt
Drag-strip hero
Posts: 202
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Post by bngt on Aug 15, 2018 20:38:23 GMT 1
I have been planning for doing the same and collected parts. First I'll have to do a TZR 472 2MA with 3XV running gear though.
The engine will go into another TZR frame. They are my favourites. It is already registered with changed engine in the papers since it has a XT 600. The papers don't mention which engine it is changed to so I think I won't mention it to the authorities.
I am undecided about which cylinders to use. YPVS is probably the sane and cheap way forward. My 421 is a bit peaky and an 842 would probably be a difficult ride.
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Post by Dangerous on Aug 15, 2018 20:41:12 GMT 1
Looking forward to this , nice 1 markπππ
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Post by rostrumorhospital on Aug 16, 2018 22:17:28 GMT 1
Not sure if you get the chance to watch much TV, but this reminds me when the 2nd series of 'Breaking Bad' came out, the 1st was a revelation and it just kept getting better, suspense / anticipation building with every episode, looking forward to the Sunday evening updates.
Good luck Mr White
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RD700LC
Aug 17, 2018 19:10:42 GMT 1
bid likes this
Post by paulincayman on Aug 17, 2018 19:10:42 GMT 1
Just seen Allen Millyard's creations in CMM, a fourcylinder 500 using stretched Kawa crank and a pair of 250LC top ends .. sounds so simple when you write it fast.. I am in awe of folks like him and your good selves on here that can do this stuff. Can't wait to see it done !! All the best.
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Post by Yogi on Aug 18, 2018 8:18:23 GMT 1
Wow I must of been busy under my rock cos I missed this Good luck mate I look forward to the updates between trying to complete the extension Atb Matt
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RD700LC
Aug 18, 2018 19:39:09 GMT 1
bid likes this
Post by 4l04ever on Aug 18, 2018 19:39:09 GMT 1
Have you sorted your forks out yet, as my mate is having a clearout and has an RWU R6 frontend from an old track bike? Has forks, yokes, calipers, master cylinder. Don't think he has the wheel or disks.
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kevf
L plate rider.
Posts: 15
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Post by kevf on Aug 19, 2018 15:27:35 GMT 1
In for the updates...ππ
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Post by yamark on Aug 19, 2018 19:07:15 GMT 1
Have you sorted your forks out yet, as my mate is having a clearout and has an RWU R6 frontend from an old track bike? Has forks, yokes, calipers, master cylinder. Don't think he has the wheel or disks. Rob, I've got the R6 front end mate - thanks for thinking of me .
And to answer the YPVS 4 cylinder, I think an Athena 820 top end would make the bike almost unusable. If I were to build a YPVS 4, I'd go standard top end, or the softest aftermarket top end.
Mark
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RD700LC
Aug 19, 2018 19:13:42 GMT 1
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Post by 4l04ever on Aug 19, 2018 19:13:42 GMT 1
Have you sorted your forks out yet, as my mate is having a clearout and has an RWU R6 frontend from an old track bike? Has forks, yokes, calipers, master cylinder. Don't think he has the wheel or disks. Rob, I've got the R6 front end mate - thanks for thinking of me .
And to answer the YPVS 4 cylinder, I think an Athena 820 top end would make the bike almost unusable. If I were to build a YPVS 4, I'd go standard top end, or the softest aftermarket top end.
Mark
You could do a 4mm stroker crank in standard cylinders... :-) RD770
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Post by yamark on Aug 19, 2018 19:46:33 GMT 1
Thanks chaps for all your input/ encouragement/ ideas.
While the crankcases were away with Harry and Graham, I thought I'd get some of the work on the frame done. The guy that spread and welded the triple frame has retired, but then last year Jon made a jig and spread an LC frame. So a couple of phone calls and Jon kindly agreed to do the work for me.
Jon, is very meticulous and spotted the side stand bracket was at an odd angle, so he said he'd sort that as well as add some tie bar brackets to my early pre-tie bar frame. I also wanted the side stand spring post moved to the outside, and some extra bracing near the lower cross mount.
Jon kindly took these images as he worked.
Side stand bracket - drunk, and removed
thumbnail_DSC02169[1]
thumbnail_DSC02163[1]
DSC02175
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Jon then made a new post to take the Triumph side stand
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Welded back on
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thumbnail_DSC02185[1]
I'll post up the jig and the frame spread next week.
Just a little tease of the 4 cylinder crankcases - you can see the outrigger section is from a YPVS, so that sorts the clutch actuation. At this point, I want to say a big thankyou to Matt (Yogi) who supplied this section of crankcase, your a star mate
SDC11524
I cant promise to post every week, as life is very busy at the moment.
Thanks for following chaps,
Cheers, Mark
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Post by dusty350 on Aug 19, 2018 20:51:38 GMT 1
Hi Mark Looking good mate. Frame work looks great, and those cases just look fantastic Hope all is good mate, and look forward to the next instalment ! Sunday nights have been dull since you finished the triple !! Dusty
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RD700LC
Aug 19, 2018 21:06:02 GMT 1
Post by Yogi on Aug 19, 2018 21:06:02 GMT 1
+1 on Dustys comments Whilst I've got no time to build at the mo,I have always got time to follow one of your great write ups and creations Good luck mate and don't be shy if you need any valve parts I may have Although actually finding thems a whole new predicament,lol Matt
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RD700LC
Aug 19, 2018 22:24:17 GMT 1
Post by donkeychomp on Aug 19, 2018 22:24:17 GMT 1
Great stuff Mark. This is going to be one hell of a bike! I have some parts that might be of use to you.
Alex
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RD700LC
Aug 19, 2018 23:16:25 GMT 1
via mobile
Post by rostrumorhospital on Aug 19, 2018 23:16:25 GMT 1
Great start to this mamouth project, Enjoy
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signal
L plate rider.
Posts: 20
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Post by signal on Aug 20, 2018 7:20:45 GMT 1
Hi Mark, Thanks for posting, very interested in seeing this come together.
A mate and I are slowly building an air cooled in line 4 to be used in a classic sidecar. If the bottom end holds together we hope to eventually go with a LC top end. You will probably finish your bike well before us if progress on your triple is anything to go by.
I do have some questions regarding welding the cases: What temperature did you preheat the cases to before welding and after welding what was the cool down procedure.
We are thinking they will need to have the temperature ramped down slowly to avoid the cases twisting when the alignment bars are removed.
We have thought we may also need to get the cases cryogenically treated prior to final assembly. Do you do or other multibuilders do this?
I will have lots more questions in the future no doubt. Thanks in advance and keep up the good work.
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RD700LC
Aug 20, 2018 8:22:37 GMT 1
via mobile
Post by ypvs400 on Aug 20, 2018 8:22:37 GMT 1
Nice work, your previous build had me start my YPVS triple which is well under way, beginning to wish I had gone for a four as strangely enough I think it would have been easier.
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Post by cb250g5 on Aug 20, 2018 9:20:01 GMT 1
Hi Mark.
Difficult to see from the pictures. Are the 4 cylinders going to be central in the frame, or offset to the left? I like the look of those Mattoon Machine billet cases, but obviously the offset means they are 3 or 4 wheel suitable only.
Looking forward to the build.
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RD700LC
Aug 21, 2018 15:47:43 GMT 1
bid likes this
Post by yamark on Aug 21, 2018 15:47:43 GMT 1
+1 on Dustys comments Whilst I've got no time to build at the mo,I have always got time to follow one of your great write ups and creations Good luck mate and don't be shy if you need any valve parts I may have Although actually finding thems a whole new predicament,lol Matt Thanks Dusty and Matt.
Matt I do need a few YPVS parts mate, and I'll give you a PM .
Moving and an extension - very brave mate.
Donkeychomp and Rostrum, cheers for your interest (Alex, I'm OK for LC parts)
Signal I wish I could answer your question, but I cant. My cases are machined and welded by Harry and Graham, I know we don't heat treat them after they are welded, just vapour blasted and leave the welds in tact. The cases will have very little stress put on them if everything is lined up accurately. Graham might read this and answer your questions. I do know the steel bars are placed through the crankshaft and output shaft bearing surfaces, the cases are heated, then welded, beyond that I would be guessing.
cb250g5 I know what you mean about the Mattoon cases, the engine mounts are very offset. My engine will be centre of the frame. The exhausts will miss the front frame tubes, but for me, they have to have an equal gap (exhaust to frame), or they will look very odd. The engine mounts at the rear are a little strange, I'll explain later, the front mounts have to be fabricated from scratch. Tie bars will be a bit of a challenge as well, but I have planned most of the details of the build.
Cheers, Mark
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RD700LC
Aug 23, 2018 13:18:05 GMT 1
via mobile
Post by andymoore on Aug 23, 2018 13:18:05 GMT 1
That's going to be a monster what Bob do think it's going to make π
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