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| MotoGP replica project - Long Term |
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| Brass_Machine:
Hi Mr Fluffy! The Hawk gt frame (bros where you are) comes standard with the single sided swingarm. As much as I love the sssa, I am not going to go with one on this project. Currently I can fit the TL1000R braced swingarm in there without some serious modification. However, I am going to go in a different direction. I have been toying around with the cbr600rr swingarm (later model) and I REALLY like the looks of it. Plus it has the indentation I need to clear the 2 stroke expansion chambers. It will require some serious mods to do that. I will have to chop the frame and fab up new swingarm pivot mounts etc... Will be using late model cbr600rr forks with the radial brakes etc... right now I have a set of cbr600 F2 forks o as a place keeper. That should keep the wheels looking identical. All this stuff although beefier/stronger is considerable lighter than stock. The RR USD forks with the extra rotor are still lighter than either the Bros items or even the F2 forks. The RR swingarm is a feather weight compared to the stock Bros item. Originally I am planning on a heavy modded RZ350 2 stroke engine (RD350 YPVS to you in Europe). 2 types of motorcycle engines I love... 2 strokes and twins. I have most of a RZ350 engine for mock up and a full TLR engine as well. I am thinking that if I have to cut up the rear of the frame anyway for the swinger, why not make the bigger TLR engine work? Some serious modding to get that in... the stock Bros twin is a 52 degree 650cc twin. The TLR is a 90degree 996cc twin. Physically a bigger engine. Heavier than the RZ350 but the same weight as the Bros engine. These are all just thoughts right now though. I am currently out of town so the bike isn't in front of me to confirm what I want to do. This has been a dream I have had for awhile. A completely custom one off bike that no-one else has (although the RZ engine in the Hawk/bros frame has been done). Count on a lot of custom carbon fiber bits. Whatever engine it has, it will be the lightest bike it can be. I fly home tomorrow so there will be pictures forthcoming with my ideas... Eric |
| MrFluffy:
On the TL motor front, I reckon it'll have that frame for breakfast, and the RZ sounds a much better option :) The vibration from the big v-twin tl motor coupled with the torque output tends to destroy frames and even the stock tl frame was prone to cracking in the odd place due to it. The tuned xt500 engine thats in my supermoto project was originally housed in a modern CR250 motocrosser with lightweight ally frame, but it was prone to cracking the main front frame loop around the headstock and downtube area etc. The builder added lots of bracing etc but never fully cured the issue, requiring regular inspection/tig attention and a replacement front loop per season, eventually tiring of it hence breaking it and selling me the lovely engine :headbang: With the tl motor it'll be a weird tl that probably wont be much of an improvement over a stock one with all the excess hacksawed off, but with the rz shrieking away through expansion chambers itll be like a little historic gp rep... If its not already obvious I think the stroker is the better option, though they must be getting rarer to find decent once even stateside. Do you have the dimensions of the cbr swinger and forks? Im trying to collate a list of swingarm dimesions for another website Im involved with that involves modifying older jap 4 strokes with more modern running gear... This is what I have for the hawk if its any help :- Hawk (shock is direct-mounted to top of swingarm)(shock end is an 'eye') Length: 545 Pivot width: 235 Pivot diameter (right): 15 Pivot diameter (left): <22 Eccentric outside diameter: 105 Eccentric width: 70 (+3 crenelated 'edge') Caliper carrier diameter: 75 Caliper carrier width: 14 Brake rotor diameter: 240 Brake rotor mount diameter: 100 Sprocket mount diameter: 165 Wheel drive diameter: 100 Im currently weighing up stuffing a late model z1000r swingarm/190 wheel, and some zx9r-b2 inverted forks, with a zx9r-c2 wheel, a zxr750 top triple, with a zr7 bottom triple, and some random toxico 6 pot calipers I found in the shed into the gpz1100b2 I have. But I need my workshop to have a concrete floor and the lathe/mill set back up before starting that or it'll be another bike in bits in the shed waiting for eternity progress blocked by waiting for some bracket or bush to be turned/milled, like the other 6... |
| Brass_Machine:
--- Quote from: MrFluffy on September 03, 2010, 04:08:32 AM ---Do you have the dimensions of the cbr swinger and forks? Im trying to collate a list of swingarm dimesions for another website Im involved with that involves modifying older jap 4 strokes with more modern running gear... --- End quote --- Sure! I don't have the RR forks just yet. I have the swinger and can take whatever measurements you need. I also have a TLR swingarm here if you want those. Do you have a link for the other website? Eric |
| Brass_Machine:
--- Quote from: MrFluffy on September 03, 2010, 04:08:32 AM ---... With the tl motor it'll be a weird tl that probably wont be much of an improvement over a stock one with all the excess hacksawed off, but with the rz shrieking away through expansion chambers itll be like a little historic gp rep... If its not already obvious I think the stroker is the better option, though they must be getting rarer to find decent once even stateside. ... --- End quote --- You are probably right. Thinking (writing) out loud helps me clarify some points. Think I will save the TL engine for my other frame project. That one will have a FFE (hossack style) front end. May even steal a BMW duo lever setup to do it. Gonna stick with the RZ engine for now. Though the Ninja 650R engine might be interesting... Got some links for you Mr Fluffy... Crazy RD500 build <- long thread but worth the time going through for just the pictures Beautiful custom framed Ninja 650R engined race bike V4 race bike build originally for Moto2 before they went to single engine. He is still building it as a track/race bike. Scratch building a v4 engine. Are you familiar with the MC frame list? Eric |
| Brass_Machine:
All right... So a different mock up picture... I love the look of that swingarm much better! Thoughts? Gonna be a pain to make work, but it can and will be done. If you look carefully, there is a white box behind the mock up engine. Just to the right of that you can see a TL1000R engine. Eric |
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