jimmyg
Drag-strip hero
Posts: 232
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Post by jimmyg on Jul 10, 2023 22:07:00 GMT 1
I have enjoyed following this build, something different that I could see myself building, top work
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Post by urbantangleweed on Aug 2, 2023 22:25:29 GMT 1
Well, it's all been a quiet on MT2 for a few weeks but that's about to change!
Her new pipes are now made and today she went on the dyno to see what she could do.
The numbers ended up at 58.5bhp and 32.1 ft-lbs of torque.
Not too shabby for a bog standard engine built up with components from my spares boxes.
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Post by urbantangleweed on Aug 4, 2023 5:44:44 GMT 1
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Post by evochris on Aug 4, 2023 10:28:34 GMT 1
They look nice, great job and suit the bike, they do look a bit low so mind the kerb lol.
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Post by urbantangleweed on Aug 5, 2023 8:23:25 GMT 1
Pipes painted with RHT Satin Black, never used it before but really nice stuff, very much like the PJ1 Fast Black was before they ruined it.
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Post by urbantangleweed on Aug 6, 2023 11:21:03 GMT 1
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MT2
Aug 6, 2023 13:08:11 GMT 1
Post by kirkhd on Aug 6, 2023 13:08:11 GMT 1
Another top job Rog, think the radiator on this one looks much better and more compact than on MT1. Do Yamaha supply you with MT's direct
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MT2
Aug 6, 2023 17:54:06 GMT 1
Post by urbantangleweed on Aug 6, 2023 17:54:06 GMT 1
Another top job Rog, think the radiator on this one looks much better and more compact than on MT1. Do Yamaha supply you with MT's direct Thank you The radiator is an experiment, I had it made to the maximum size that would fit in the space, whether it has enough cooling capacity remains to be seen. There isn't enough room at the back to mount a fan, but if needed, a "blow" one could possibly fit on the front. I've also bought an inline coolant hose unit which incorporates several circular heatsinks, no idea if it will do much/anything, but if she does run a tad warm, I'll try that first just to see. www.24mx.co.uk/product/twenty-radiator-hose-cooler-small_pid-PM-0035481No, Yamaha have had no involvement other than producing the incredible MT125 from which the MTs were born!
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Post by urbantangleweed on Aug 7, 2023 14:50:18 GMT 1
MT2 flew through her MOT this morning 🙂
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Post by urbantangleweed on Aug 7, 2023 16:28:32 GMT 1
The MOT place is half a mile from me. I've lived in the same house for nearly 33 years. So how is it I take so many wrong turns on the way home?
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Post by urbantangleweed on Aug 12, 2023 9:48:23 GMT 1
After the MOT on Monday, she's now all road legal. Taxed as a 125 as that's all its possible to do at present, but all the paperwork done and sent off to DVLA including a V70 and a 28 quid cheque for the difference in the road tax for her as a 350. Took a steady 30 mile ride round the local countryside and she rides really well, handling is fab and she has oodles of go just like MT1. Cooling is, as I expected it might be, a bit sketchy. Traffic lights cause anxiety and arriving at temporary ones at the wrong time increases that tenfold! I have a cunning plan for some fan assistance which I'm going to try out. The radiator I had made works well, but as suspected, there's not really enough of it. Nothing I can do about putting anything larger in so other solutions will need to be found. A spare set of wheels have gone for a colour change and they'll get new bearings, seals and a pair of H rated Avon Roadrider II's fitted.
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Post by urbantangleweed on Aug 13, 2023 7:01:29 GMT 1
Out again yesterday after making some experimental "scoops" for the rad from a piece of aluminium heatsink. It seemed to help although the ambient temperature was a few degrees less than for the previous days ride, but, undeterred, I made some bigger ones! Not sure if it's the heatsink effect or that they might help the incoming air from spilling off the sides of the rad so much, but she was definitely running about 5 degrees cooler in general. It'll still need some kind of fan system though, as at a standstill, or in slow moving traffic, the temperature just keeps climbing, so I'm making up a frame which will carry 2 (or even 3) 50mm 12v computer fans. It's all good fun!
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MT2
Aug 15, 2023 9:01:17 GMT 1
Post by urbantangleweed on Aug 15, 2023 9:01:17 GMT 1
Cooling remains the number 1 issue to fix but space for a proper fan is limited. In an ideal world, I'd just put a SPAL 4 inch push flow one on the front, but at 60mm deep, there really isn't the space, oh, and it's a bit of a carbuncle to have in full view. For experimentation, I ordered 3 x 12v 50mm computer fans and set to rigging up a mount for them. The installation looks quite neat and could be further improved with a mesh grille of some sort over the front. Unfortunately, while they do have some effect, they fight a losing battle. Next incarnation will likely be 2 x 80mm versions.
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Post by 4l04ever on Aug 15, 2023 9:20:32 GMT 1
If you make a version 3, maybe look at a TZR250 2MA or TDR250 engine as they are shorter so should make fitting everything easier.
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MT2
Aug 15, 2023 12:29:39 GMT 1
Post by urbantangleweed on Aug 15, 2023 12:29:39 GMT 1
If you make a version 3, maybe look at a TZR250 2MA or TDR250 engine as they are shorter so should make fitting everything easier. I think 2's enough!
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Post by urbantangleweed on Aug 26, 2023 15:49:27 GMT 1
MT2 got new bra and panties! 😊
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MT2
Aug 27, 2023 1:26:55 GMT 1
Post by JonW on Aug 27, 2023 1:26:55 GMT 1
I've found that the problem with fans is that the fan(s) itself and the brackets also block the airflow to an extent, so you sort of go backwards and forwards at the same time. I think what you really need is more surface area, fans will only help so much sadly. You know this of course.
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Post by urbantangleweed on Aug 27, 2023 7:01:28 GMT 1
I've found that the problem with fans is that the fan(s) itself and the brackets also block the airflow to an extent, so you sort of go backwards and forwards at the same time. I think what you really need is more surface area, fans will only help so much sadly. You know this of course. Yep, it's a yin and yang kinda thing...... That's why, apart from a lack of space, I'm experimenting with computer fans, mainly because they're thin but also because they aren't so restrictive as a fixed fan that only moves when energised, of course the downside is they don't move the volume of air a dedicated radiator fan does. Version 1 with the 3 x 50mm fans didn't cut the mustard and even at tickover, they would slowly lose the battle, so, version 2 with 2 x 80mm fans is in progress and they do bring the temp down at standstill, so I seem to be moving in the right direction. It's all about experimentation The inline hose cooler gets hot so that must be helping a bit, so I've got one of the larger versions to try (assuming it will fit in the space available) hopefully try that today. The aluminium heatsinks on the sides of the rad also help a bit it seems, they also provide useful mounting points for the fan assembly. I've also got a YSS shock to go on her and although that doesn't actually need fitting as yet, I hope to get that on today as well, only because it's got a red spring and I want to see it on....
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MT2
Aug 27, 2023 14:56:18 GMT 1
Post by 4l04ever on Aug 27, 2023 14:56:18 GMT 1
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MT2
Aug 27, 2023 19:16:27 GMT 1
Post by urbantangleweed on Aug 27, 2023 19:16:27 GMT 1
Cheers Rob, trouble is, the more powerful ones tend to be 25mm thick, I can really work only with a maximum of 15mm at present. I could move the fan mount up a little which might give me the room, but today I fitted the larger version of the inline cooler, dropped the anti-freeze content to about 25% and things look a lot better. Doubtless I'll need to come up with something more for if the weather ever gets hot in England again, but for now, the situation is improved somewhat and the 2 x 80mm fans win the battle, albeit slowly........
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Post by mak595 on Sept 4, 2023 19:44:02 GMT 1
Pipes painted with RHT Satin Black, never used it before but really nice stuff, very much like the PJ1 Fast Black was before they ruined it. Going to order some satin black when it's back in stock on Thursday, did 1 can do both exhausts comfortably?
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MT2
Sept 5, 2023 8:39:52 GMT 1
Post by urbantangleweed on Sept 5, 2023 8:39:52 GMT 1
Pipes painted with RHT Satin Black, never used it before but really nice stuff, very much like the PJ1 Fast Black was before they ruined it. Going to order some satin black when it's back in stock on Thursday, did 1 can do both exhausts comfortably? Almost, I used a can and a bit.
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Post by mak595 on Sept 8, 2023 6:28:01 GMT 1
Going to order some satin black when it's back in stock on Thursday, did 1 can do both exhausts comfortably? Almost, I used a can and a bit. Thanks, I'll get a couple of cans to be sure 👍
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Post by urbantangleweed on Feb 11, 2024 9:40:42 GMT 1
Rad re-jigged, coolant flow appears to have increased which should help with cooling efficency, thought of another mod to do on it which might help further. It now has a boss welded in for a fan thermo switch so at some point, I won't need to monitor the temperature so much and operate the manual fan switch when needed. All work in progress.....
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MT2
Feb 11, 2024 9:45:45 GMT 1
Post by urbantangleweed on Feb 11, 2024 9:45:45 GMT 1
Been working on getting a standard gearshift linkage set up fitted so I can go from race to road pattern, it all seems to be working out well so far. Titanium gear lingage rod made to my specs for just £20 seemed like a real bargain and looks great.
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Post by 4l04ever on Feb 11, 2024 10:25:38 GMT 1
Sometimes less flow is better for cooling as the coolant stays in the radiator for longer so can cool more.
May be worth fitting two temperature sensors so you can compare water temp going into the radiator with what is coming out.
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MT2
Feb 11, 2024 22:05:32 GMT 1
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Post by urbantangleweed on Feb 11, 2024 22:05:32 GMT 1
If the flow turns out to be too fast Rob I have ways to slow it down, easier to do that than speed it up. I'm having fun experimenting though! 🙂
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Post by Tobyjugs on Feb 12, 2024 22:28:28 GMT 1
My personal experience and preference is to adjust the flow so that you have no more than 1 degree maximum temperature difference between entering and leaving the engine. That is without a thermostat in the system.
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MT2
Feb 13, 2024 7:02:25 GMT 1
Post by urbantangleweed on Feb 13, 2024 7:02:25 GMT 1
My personal experience and preference is to adjust the flow so that you have no more than 1 degree maximum temperature difference between entering and leaving the engine. That is without a thermostat in the system. Is that at tickover?
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MT2
Feb 13, 2024 10:03:35 GMT 1
via mobile
Post by Tobyjugs on Feb 13, 2024 10:03:35 GMT 1
My personal experience and preference is to adjust the flow so that you have no more than 1 degree maximum temperature difference between entering and leaving the engine. That is without a thermostat in the system. Is that at tickover? No running temperature. It is a bit of a juggling game which also has a lot to do with the efficiency of the radiator. But aim for a degree max when running at shall we say 7000rpm. You need good flow through the engine or it will get hot. Standard pump is good enough. Think of the radiator like a river. Big river slow flow small river faster flow, the bigger the radiator generally it will flow slower. The in out temperature of engine is important.
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