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Post by markhoopy on Jan 28, 2018 22:02:10 GMT 1
The beginnings of a +10mm 535 p/v engine. I thought the +10mm crank would drop straight in without problem as the Banshee cases had already been trenched, but though it does physically fit there is a slight hint of a tight spot when the right-hand big end bearing is at BDC. I think the trenching work must need widening ever so slightly so further investigation with engineers blue is in order. All Photob*cket pics are now swapped over to Flickr and I will get more pics of the other items I have acquired and add them in the next week or so.
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Post by yamark on Jan 29, 2018 8:05:20 GMT 1
So glad this build is moving forward again. That engine is going to be an absolute beast. What power are you hoping for Mark?
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Post by dusty350 on Jan 29, 2018 8:32:54 GMT 1
Good to see this is moving forward Mark The rolling chassis looks stunning, and that engine is gonna be mad !! Dusty
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Post by 4l04ever on Jan 29, 2018 11:32:13 GMT 1
Is this the top end that needs the water flow reversing to keep the exhaust bridges cool?
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Post by markhoopy on Jan 29, 2018 14:53:21 GMT 1
Mark, Dusty .. I have no idea what kind of power it will make but as with the 443 that's in my RS I would much rather have a good midrange spread than outright hp and the p/vs on this cylinder should help that a fair old bit. I'll get some photos up to show the ports in the CPI cylinder - there's a fair few of them and they aren't exactly small
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Post by markhoopy on Jan 29, 2018 14:55:51 GMT 1
Is this the top end that needs the water flow reversing to keep the exhaust bridges cool? I'll be using a separate pump and not the standard impeller so this should be simple enough to do yes.
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Post by Tobyjugs on Jan 30, 2018 0:28:42 GMT 1
I will be watching this one with interest
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Post by markhoopy on Nov 8, 2019 19:41:52 GMT 1
Over the past twelve months I've sold all the bikes apart from this one .. much more room in the shed to move about, and a boost to the bank balance too. Lots of forum members seem to be getting started on very special builds so it looks like a good time to join in and tag along! A bit of lateral thinking early last year, followed by a handful of phone calls to the nice people at the DVLA and some ebay browsing led me to this .. It is a Yamaha XV535 frame, and the registration document now has the engine number from the Banshee crankcases in place of that from the original V-twin tractor motor. Using the frame as a donor for the NWS made sense with it being a Yamaha and having the same engine capacity but I was still quite surprised that the DVLA were happy for me to use it - it seems that Back Street Heroes readers have been doing a similar thing with lowriders or chops or whatever it is they put together for many years now, and as long as I keep hold of the donor frame it is perfectly okay to drill out the pop rivets holding the VIN plate to it and swap it over to the NWS frame.
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Post by markhoopy on Nov 8, 2019 19:59:09 GMT 1
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Post by dusty350 on Nov 8, 2019 20:13:24 GMT 1
Great to see you back on this Mark It's gonna make an awesome special I used UNI filters on my Café racer bike. You can buy them with a 15 degree angle built in so it tips the filters away from frame tubes. Had to get them from the US though, but were here in just over a week. Looking forward to your progress Dusty
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Post by markhoopy on Nov 8, 2019 20:57:43 GMT 1
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Post by midlifecrisisrd on Nov 8, 2019 20:59:57 GMT 1
Looking awesome mark
Great news on the donor vin thing too, about to do the same 😉
Steve
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Post by Tobyjugs on Nov 9, 2019 18:37:20 GMT 1
Great to see this up and running.
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Post by veg on Nov 10, 2019 8:55:39 GMT 1
Great bit of work mark, looks fabulous.
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Post by botty on Nov 10, 2019 11:18:51 GMT 1
Talking of “ Back Street Heroes” Mark Mine got featured some years ago. Funnily enough it started its life as a Gt 185 or 250. My mate Alan (Hollywood Welder) on here built the frame from scratch. Straight tube one week. Rolling chassis the next upload images for free
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Post by hoist1 on Nov 10, 2019 13:46:13 GMT 1
Re space for filters, even with mods, what about making it reverse cylinder?
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Post by jessy03 on Nov 10, 2019 14:23:45 GMT 1
Looking good, you might have to loose the powervalves to get a radiator in, looks pretty tight Jess
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Post by veg on Nov 10, 2019 15:33:34 GMT 1
If you’re running a fairing could you fit radiators to the side like the VTR 1000? Or a dual rad system small one in the nose and a small one below the headstock?
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Post by Tobyjugs on Nov 10, 2019 21:02:44 GMT 1
+1
What Veg said is what i was thinking. and the radiator type i was thinking about for the bottom of the fairing is a mini moto radiator from the tiny race bikes.
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Post by dusty350 on Nov 10, 2019 21:25:06 GMT 1
Someone like GMX will make a bespoke rad to fit your needs. I've spoken to the guy that runs it before and he seems really helpful, and said he did bespoke parts. Dusty
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Post by midlifecrisisrd on Nov 10, 2019 21:27:26 GMT 1
Exactly my thoughts Dusty. Custom curved rad.
Either that or a rad mounted to the headstock with some frog eye lights above 🤣🤣🤣
Steve
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Post by markhoopy on Nov 10, 2019 22:00:06 GMT 1
Re space for filters, even with mods, what about making it reverse cylinder? I thought about doing that a year or so ago but then it was pointed out to me by someone far more knowledgeable that the cylinder mounting studs on the YPVS and Banshee engines wouldn't allow it. You can see from this pic that the centre-rear studs are set back further than the outer two, so the cylinder wouldn't fit on 'backwards'. If the studs did line up and allowed the cylinder to be reversed you would then have the exhaust stubs pointing down towards the top of the engine cases too - the clutch actuator arm would be in the way which would mean the cylinder needing some serious modification to get the exhaust stubs pointing straight back ..
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Post by markhoopy on Nov 10, 2019 22:25:45 GMT 1
Cooling options .. The engine isn't fixed in place properly yet - the top rear frame lugs need cutting off and moving over to the right by about 35 or 40mm to get the engine central in the frame. You can see from this angle how far it needs moving .. Once central the frame bracing plate will need shaping back so the clutch side casing doesn't push against it, but the swinging arm pivot tube will also be in the way so the engine could ideally be lifted slightly and moved further back in the frame as well as being brought across to the right. Until the engine is in the frame properly I won't know how much room there is between the hydraulic powervalves and front wheel, but it seems likely that I will need two smaller radiators rather than one large one. There are a few different options on where the radiators will mount - in the nose of the fairing seems the best place for one, with a couple of other options for a second that will be decided once the engine is in place. Side-mounted radiators would need a fan too veg which would make the bike look more like a pregnant whale than a nice, slim two-stroke
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Post by mouse on Nov 11, 2019 7:55:56 GMT 1
So glad this is back on, it's going to make one very 'trick' bike!
Mouse
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Post by veg on Nov 11, 2019 11:08:46 GMT 1
Of course hadn’t thought about fans end up looking like a late model buell 🤮 So twin smaller rads I’m guessing then.
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Post by 4l04ever on Nov 11, 2019 21:45:53 GMT 1
You only need fans if you are sitting in traffic. They do not help while actually moving as the air flow past the bike is loads more than a fan can push.
You could fit a shallow but deep rad above the exhausts, tucked right up, and two side rads outside the pipes. The V6 1200 two stroke had a few radiators on it including two connected in a vee in the nose.
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Post by Tobyjugs on Nov 11, 2019 23:32:07 GMT 1
Also check out the construction of a Toomey built TZ 250 5KE radiator. This might also give you some ideas.
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Post by hoist1 on Nov 12, 2019 9:02:59 GMT 1
Re space for filters, even with mods, what about making it reverse cylinder? I thought about doing that a year or so ago but then it was pointed out to me by someone far more knowledgeable that the cylinder mounting studs on the YPVS and Banshee engines wouldn't allow it. You can see from this pic that the centre-rear studs are set back further than the outer two, so the cylinder wouldn't fit on 'backwards'. If the studs did line up and allowed the cylinder to be reversed you would then have the exhaust stubs pointing down towards the top of the engine cases too - the clutch actuator arm would be in the way which would mean the cylinder needing some serious modification to get the exhaust stubs pointing straight back .. See what you mean, prob not the best idea even if it could be done. For the radiator how about a la Benelli ?
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Post by JonW on Nov 12, 2019 23:35:43 GMT 1
You could fit AC top end... no rad needed... (I'll get me coat.... )
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Post by markhoopy on Nov 13, 2019 0:28:52 GMT 1
You could fit AC top end... no rad needed... (I'll get me coat.... )
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