 Project 360
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Joined: Jan 2005
Posts: 12
Complete Newb
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OP
Complete Newb
Joined: Jan 2005
Posts: 12 |
Hello First start of my SM engine with 360 deg crank was successful  I used crank cases, barrels and head from SM and all internals from standard bonneville engine. It was quite easy job to do. All parts fit straight on. Only problem was that I did't realised that standard bonneville has only 1 coil. Though I used standard bonneville ignition box only 1 coil got signal. Problem was solved to connect SM coils negative terminal together. Next job is 21" front rim, to make new front fender, paint rims and maybe make new gas tank (If I have time). One good thing of having long winters  Jani
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 Re: Project 360
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Joined: Jan 2005
Posts: 7,643
Monkey Butt
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Monkey Butt
Joined: Jan 2005
Posts: 7,643 |
Sounds as though you know what you are doing Jani, you should post photos as you go through the stages of build. 
Ray(UK)
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Re: Project 360
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Joined: Jan 2005
Posts: 2,531
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 2,531 |
Dang ! 
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Re: Project 360
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Joined: Jan 2005
Posts: 2,362
Oil Expert
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Oil Expert
Joined: Jan 2005
Posts: 2,362 |
Quote:
Hello
First start of my SM engine with 360 deg crank was successful
I used crank cases, barrels and head from SM and all internals from standard bonneville engine.
It was quite easy job to do. All parts fit straight on.
Only problem was that I did't realised that standard bonneville has only 1 coil. Though I used standard bonneville ignition box only 1 coil got signal.
Problem was solved to connect SM coils negative terminal together.
Next job is 21" front rim, to make new front fender, paint rims and maybe make new gas tank (If I have time).
One good thing of having long winters
Jani
Makes sense that they'd only use one coil on a 360 degree motor as they're firing together. I'm guessing it has a wasted spark? (eg: the spark plugs fire twice as often as they need to, on both compression and exhaust strokes?) You could save a little weight/space and simplify it by using a bonneville single coil, but the twin coils will probably give you a stronger spark (and an extra item to fail when you least expect it).
I'm hoping you'll put it on a dyno when you're done, will be interesting to compare the results to a 270 degree motor.
Are you planning to lower the front end to compensate for the taller geometry of bike with the 21" rim? While I'm on the topic, do you feel like selling me your standard 18" rim for a project I'm playing with?
Looking forward to seeing pics of the finished item.
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Re: Project 360
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
I read somewhere they are a wasted spark...
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: Project 360
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Joined: Jan 2005
Posts: 12
Complete Newb
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OP
Complete Newb
Joined: Jan 2005
Posts: 12 |
Thanks for your comments I will post pictures as soon I get my 21" front wheel and fender installed. I ordered the rim today and they said that delivery time is about 3 weeks. Dyno run is on the to do list Head is also ported so I'm eager to see the results. I have allready lowered front end 1" but I might lower it bit more, not sure yet. Matt I can sell you my original wheel but delivery to you could be quite expensive. I can ask the price if you like. Regards, Jani
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Re: Project 360
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Joined: Jan 2005
Posts: 2,968 Likes: 1
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 2,968 Likes: 1 |
Can I ask why you're converting from 270 to 360? I'm just curious as to why someone would go to such lengths to convert to a standard bonneville crank and timing. What benefit do you expect to gain from this conversion?
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Re: Project 360
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
Also, how does the price compare to just buying a 360 motor and changing out the cases?
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: Project 360
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Joined: Jan 2005
Posts: 3,753
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 3,753 |
from what i understand the 270 is just as good if not better, i know that the 270 is used for the flat track raceing. it comes down to how the power comes on rather than how mch power they make. or i am totally wrong
Frank
(Former)05 BA tbike pipes, ai removed, Freak, mikuni hsr 42's, 904, ported/polished head, 1mm oversized valves
NOW-2010 silver and black tbird
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Re: Project 360
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Joined: Jan 2005
Posts: 2,968 Likes: 1
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 2,968 Likes: 1 |
Quote:
from what i understand the 270 is just as good if not better, i know that the 270 is used for the flat track raceing. it comes down to how the power comes on rather than how mch power they make. or i am totally wrong
Frank
Yep!!!
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Re: Project 360
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
Bottom line is the cat doesn't need a reason other than "I want to" but it would be interesting to find out
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: Project 360
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Joined: Jan 2005
Posts: 2,968 Likes: 1
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 2,968 Likes: 1 |
Quote:
Bottom line is the cat doesn't need a reason other than "I want to" but it would be interesting to find out
He absolutely doesn't need a reason. Maybe he just likes being different. The sound will be different anyway.
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 Re: Project 360
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Joined: Jan 2005
Posts: 12
Complete Newb
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OP
Complete Newb
Joined: Jan 2005
Posts: 12 |
Well, there was two reasons to do this mod. First was that engine problems that I had with original unit, Triumph nor I just could not get sorted out. They really did they best, even dismantle the engine. I also check the engine really carefully when I dismantle it but I could not find anything wrong with it. Root cause was probably assembly error in clutch from factory which Triumph did repair, but bad vibration that it caused did not get fixed. Second reason was that I really like the sound from 360 engine. It just sounds like old brit bikes . I bought used standard bonneville engine from UK and used it's internal parts. I did't want to just swap engines because black engine just look's so right in SM and I was interested to see the engine design. I did consider to get another bike. I tested Rocket3 and HD Street Glide but after that test I realised just how good bike the SM and Bonneville family in general is. Regards, Jani
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Re: Project 360
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Joined: Jan 2005
Posts: 12,877
Should be Riding
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Should be Riding
Joined: Jan 2005
Posts: 12,877 |
Very cool indeed. Love to see some pics!
Benny
Black & Silver '02
Too many mods to list
Not enough miles ridden
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Re: Project 360
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Joined: Jan 2005
Posts: 2,968 Likes: 1
Loquacious
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Loquacious
Joined: Jan 2005
Posts: 2,968 Likes: 1 |
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Re: Project 360
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Joined: Jan 2005
Posts: 1,500
Learned Hand
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Learned Hand
Joined: Jan 2005
Posts: 1,500 |
Quote:
It just sounds like old brit bikes .
Reason enough for me! I wish I had the mechanical know how to do stuff like that.
Learning from my mistakes... again and again.
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Re: Project 360
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Joined: Jan 2005
Posts: 12
Complete Newb
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OP
Complete Newb
Joined: Jan 2005
Posts: 12 |
Hello Here is the pictures of my project http://www.bonnevilleamerica.com/photopost/data/500/321mp-kuvia_019.jpghttp://www.bonnevilleamerica.com/photopo...=500&page=1 http://www.bonnevilleamerica.com/photopo...=500&page=1The 360 engine is working really good. Dyno run is still to come and I will post results here then. I have just started motorcycle/metal fabrication company called Polameri Metal Works specializing to Bonneville family. My plan is to start making fenders, tanks etc. for Bonnevilles from metal and aluminum and some other special parts too. I will also do service and tuning jobs. Url is www.polameri.com but it's not active yet. I will post info when web pages are ready. First examples are the front fender and rear shock "shield" made from solid steel bar. Bike is not nearly finished (are they ever  ) Next job is new tank, seat, rear fender and front fender from aluminium. Best regards, Jani
Last edited by Jani; 06/04/2007 4:48 PM.
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Re: Project 360
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Joined: Feb 2007
Posts: 23,227 Likes: 62
Fe Butt
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Fe Butt
Joined: Feb 2007
Posts: 23,227 Likes: 62 |
Like it so far. I thinking of powder coating my lower legs and trees black with polished shrouds. Powder coating wheels too maybe.
I learned all I need to know about life by killing smart people and eating their brains.
Eat right ,Exercise ,Stay fit, Die Anyway!
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