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Post by adspeed on Nov 1, 2007 22:25:17 GMT
Ok just thought I'd show ya some pics of the Falc build in progress.......steady progress Ok just to show where the machining has broken through..... Which one to go for.........now this is the vital question...... Just for laughs....38mm TMX may be a wee bit big.....but not out of the question!!! ;D
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Post by Juan on Nov 1, 2007 22:46:58 GMT
Could we bugger about with Minikins old signature pic?
Small frame,big carb. ;D
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Post by m1mental on Nov 2, 2007 17:57:47 GMT
Are you using for the road race or sprinting? as falcs are a nice bit of kit and they have been getting high power outputs in Italy
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Post by adspeed on Nov 2, 2007 21:19:09 GMT
Its going on the track, fingers crossed ;D I've seen one or two dyno's with good results, I'm not messin with the timings they should be a good a starting point. Exhaust is a bit of an issue, will depend on which way the barrel goes. Hmmmmm...... Barrel right way roundPro's Can run the engine in my road bike for testing. Off the shelf exhaust available Cons Doesn't look as good Long inlet and bendy exhaust outlet Barrel reversedPros Better inlet and exhaust - Hp increase?? Can use a trick carb Looks better ;D Easier to get to carb should jets need tweakin Cons Exhaust could be a pig Fuel starvation......? Hmm I dunno decisions decisions......
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Post by pj on Nov 4, 2007 2:15:50 GMT
Ok just thought I'd show ya some pics of the Falc build in progress.......steady progress Ok just to show where the machining has broken through..... Which one to go for.........now this is the vital question...... Just for laughs....38mm TMX may be a wee bit big.....but not out of the question!!! ;D the machining for all my fabrizi engines (3 of them ) have broken through to that stud. it doesnt seem to leak, but i do use a good dolop of silicon tho. i had a new 38mm kehin i used when i set up my first fabrizi (like it suggest on fabrizi site), it seemed to produce less power than the 34mm, we couldnt set it up right. messy mid range, i really think it was too big for the amount of air we could get into the engine. i havnt tried a 38 on my latest engine, maybe it would work better now it has more hp. paul
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Post by adspeed on Nov 4, 2007 10:30:13 GMT
Hmmmm I was thinking down the 34mm/35mm route really, Mikuni of Dellorto. I'm was thinking if I reverse the barrel I could use a carb with an angled float bowl then the inlet tract would be in a dead straight line. Not sure....... The 38mm is from another project that shouldn't be mentioned on these pages ;D
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Post by tony on Nov 4, 2007 19:41:14 GMT
hi adspeed. Nice barrel! i have a few ideas..And i guess this is for your grp 5? Firstly are you keeping it aircooled? If yes then my advice is not to reverse the barrel. Reason being is you really need to cool the exhaust side of the cylinder first. Very important. The reed assy /manifold will block the air to the head too..Also this "reversed" config will mean that the carb has to hang out the side of the bubble-not good if you bin it (right side more prone as there are more right corners). You'll prob need a pump too..(more to go wrong). Why don't you use standard config but simply bring the carb out of the rhs bubble at the front? You can access the carb, fuel starvation dissappears,and its a very short manifold. Against is that occassionally on a windy circuit you'll find the carb gets swamped by forced air and power drops-solution is a ram air filter tho you do lose a little power at all times. What small end size is your piston? I maybe could of shown you a way round the stud breaking thru issue.
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Post by pj on Nov 4, 2007 20:02:29 GMT
hi adspeed. Nice barrel! i have a few ideas..And i guess this is for your grp 5? Firstly are you keeping it aircooled? If yes then my advice is not to reverse the barrel. Reason being is you really need to cool the exhaust side of the cylinder first. Very important. The reed assy /manifold will block the air to the head too..Also this "reversed" config will mean that the carb has to hang out the side of the bubble-not good if you bin it (right side more prone as there are more right corners). You'll prob need a pump too..(more to go wrong). Why don't you use standard config but simply bring the carb out of the rhs bubble at the front? You can access the carb, fuel starvation dissappears,and its a very short manifold. Against is that occassionally on a windy circuit you'll find the carb gets swamped by forced air and power drops-solution is a ram air filter tho you do lose a little power at all times. What small end size is your piston? I maybe could of shown you a way round the stud breaking thru issue. i agree, cooling the exhaust side of the barrel first makes sense. fuel pumps are pretty reliable tho. we got 1.5 hp extra from removing the fan and using a lightened flywheel. also got a little more midrange from the 8 degrees of advance of the vespatronic. another experiment we tried, we got a little less than half a hp from adding a air filter. the theory being, it acts a reservoir for the mixture. not sure if thats always the case, as i see high hp racing motorcycles with and withour filters. paul
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Post by adspeed on Nov 4, 2007 20:57:43 GMT
Funny I've just been in the garage holding up the cylinder against my 50 spesh (bit sad but hey ho) and figuring out what to do. I came up with two options carb inside or outside but definatley the right way round. Looking at the fuel route the reverse barrel could be a proper pain.........and the shocker carb area was gonna be a bit tight.
Realistically I'm gonna get enough power to get me round the track for my first season, so inside outside...tomato tumato ;D Inside - cut holes in the frame under fuel tap,outside - cut big hole in side.......
Thanks for the advice guys, I'm planning on using a vespotronik unit as in my road bike.....
Been out and measured the pin and it seems to be 15mm? Crank has a T5 rod.....
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Post by Juan on Nov 4, 2007 21:51:19 GMT
T5 'rod is a 16mm isn't it?
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Post by ozoap on Nov 4, 2007 22:39:04 GMT
Use a Wiseco B1038 smallend bearing if you wanna fit a 15mm pin piston to a 16mm rod. What's the best???
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Post by tony on Nov 5, 2007 0:21:48 GMT
i ran my race motor without fins or in fact any flywheel at all..just the center boss and it gained 2bhp! Not good for 12 laps tho! hi adspeed. Nice barrel! i have a few ideas..And i guess this is for your grp 5? Firstly are you keeping it aircooled? If yes then my advice is not to reverse the barrel. Reason being is you really need to cool the exhaust side of the cylinder first. Very important. The reed assy /manifold will block the air to the head too..Also this "reversed" config will mean that the carb has to hang out the side of the bubble-not good if you bin it (right side more prone as there are more right corners). You'll prob need a pump too..(more to go wrong). Why don't you use standard config but simply bring the carb out of the rhs bubble at the front? You can access the carb, fuel starvation dissappears,and its a very short manifold. Against is that occassionally on a windy circuit you'll find the carb gets swamped by forced air and power drops-solution is a ram air filter tho you do lose a little power at all times. What small end size is your piston? I maybe could of shown you a way round the stud breaking thru issue. i agree, cooling the exhaust side of the barrel first makes sense. fuel pumps are pretty reliable tho. we got 1.5 hp extra from removing the fan and using a lightened flywheel. also got a little more midrange from the 8 degrees of advance of the vespatronic. another experiment we tried, we got a little less than half a hp from adding a air filter. the theory being, it acts a reservoir for the mixture. not sure if thats always the case, as i see high hp racing motorcycles with and withour filters. paul
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Post by ozoap on Nov 5, 2007 13:50:21 GMT
ozoap-think the top left image may have the flow a little wrong if thats a rotary valve? Non of em seem to show the flow going through the transfers.
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Post by knowledge on Nov 14, 2007 20:49:21 GMT
I think you guys are taking oz's diagrams a little too literally.
Can we see some more photos of this project please?
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Post by jonnysnatchsniffer on Nov 15, 2007 9:02:31 GMT
for fucks sake just hurry up and build the thing then you can tall us what it goes like ;D i have a couple of cases to play with and i gotta no how the falc goes
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Post by adspeed on Nov 15, 2007 13:40:07 GMT
Moving on.....Jonny I'm on with it mister I'll be doing a bit this week so I'll keep you informed ;D
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Post by adspeed on Dec 6, 2007 22:24:37 GMT
Ok not much happening but soon be off to Paintshack!! ;D
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Post by tony on Dec 6, 2007 23:30:38 GMT
that motor looks feisty to me!
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Post by adspeed on Dec 8, 2007 15:59:50 GMT
Hopefully!! ;D
So whats peoples thought on colour, what did you decide on Tony? Was gonna be Kwacka green and black, maybe just black, orange and black.....Aaaaaagh.
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Post by tony on Dec 9, 2007 0:42:05 GMT
well prior to tsr gate I spoke to Norrie to see if he would mind the kwacka green. He was pleased actually- not a replica but a sort of tribute. Then i got cold feet. but now they are warming up again! Saves puuting the green number backgrounds on too. Time will be tight tho as falc arrives next week then its a quick build and new pipe to be made before stripping it down.
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