 finned exhaust collars
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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OP
Learned Hand
Joined: Jan 2008
Posts: 1,174 Likes: 15 |
with the early onset of winter I have been spending some time in the shop playing with the 05 speedmaster. I wrapped the headers and painted them and ginned up these finned collars to round out the look. they will be anodized black and painted with a high temp coating and then the fins (OD) turned clear to finished.  close up 
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: finned exhaust collars
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Joined: Aug 2007
Posts: 10,735 Likes: 7
Should be Riding
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Should be Riding
Joined: Aug 2007
Posts: 10,735 Likes: 7 |
how much to send a set my way? 
Always remember to be yourself. Unless you suck. Then pretend to be someone else.
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Re: finned exhaust collars
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Joined: Jul 2007
Posts: 6,060 Likes: 6
Worn Saddle
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Worn Saddle
Joined: Jul 2007
Posts: 6,060 Likes: 6 |
Always like the look of bigger finned exhaust collars. My Dealer friend and his regular bunch never thought much of them cause they weren't any more "functional", but I've had them on a couple of custom bikes in the past.
Fidelis et Fortis
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Re: finned exhaust collars
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Joined: Mar 2005
Posts: 150
Adjunct
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Adjunct
Joined: Mar 2005
Posts: 150 |
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Re: finned exhaust collars
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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OP
Learned Hand
Joined: Jan 2008
Posts: 1,174 Likes: 15 |
some more winter project work. I am moving the oil filter from directly behind the sump to under the tranny. it will mount to the existing frame tabs. the oil filter will be horizontal and out of the way of road damage. 
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: finned exhaust collars
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Joined: May 2012
Posts: 514 Likes: 2
Adjunct
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Adjunct
Joined: May 2012
Posts: 514 Likes: 2 |
Nice work, did you make your own oil coolers? Do the coolers lower the oil temp much more as compared to the stock cooler. Did your bike have the evap canister under the frame for emissions control. I have a 09 i bought here in San Diego and it has smog eqpt. all over it. Des.
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Re: finned exhaust collars
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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OP
Learned Hand
Joined: Jan 2008
Posts: 1,174 Likes: 15 |
Quote:
Nice work, did you make your own oil coolers? Do the coolers lower the oil temp much more as compared to the stock cooler. Did your bike have the evap canister under the frame for emissions control. I have a 09 i bought here in San Diego and it has smog eqpt. all over it. Des.
I did make my own oil coolers. They are a little better than the OEM cooler but not hugely so (I measured the in/out temps with both setups using a IR heat gun from work). The air flow over the engine is better though and overall cooling is better. That said, it is mostly a cosmetic change.
My bike originly had the smog stuff but it was removed by the dealer (at my request) when they set up the bike. No emmissions control required here for bikes
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: finned exhaust collars
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Joined: May 2012
Posts: 514 Likes: 2
Adjunct
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Adjunct
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Did you put a twisted insert into the bore of the cooler? i got a piece of sheet aluminum and cut a strip about 5/8" wide x 12"long and twisted it till it fit into the 7/16" hole i drilled down the cooler bore. this slows down the flow which allows the oil to transfer its heat to the finned tube. I'm thinking of putting a radius on the top and bottom of the fins for a smoother look and to also increase surface area for air flow. With all the jobs i've got going at home there isn't enough hours in the day.
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Re: finned exhaust collars
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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OP
Learned Hand
Joined: Jan 2008
Posts: 1,174 Likes: 15 |
Quote:
Did you put a twisted insert into the bore of the cooler? i got a piece of sheet aluminum and cut a strip about 5/8" wide x 12"long and twisted it till it fit into the 7/16" hole i drilled down the cooler bore. this slows down the flow which allows the oil to transfer its heat to the finned tube. I'm thinking of putting a radius on the top and bottom of the fins for a smoother look and to also increase surface area for air flow. With all the jobs i've got going at home there isn't enough hours in the day.
the coolers are a bit different inside. if you looked into them from the top down, you would see a reverse donut. the center is solid so as to remove the 'core' from the oil flow, where the heat transfer would be very minimal. So instead there is a 'shell' of oil with a better surface area to cross section ratio. And to prevent the flow from becoming laminar, there are 3 orifice plates with angled holes to alter the oil flow (both direction and volume). Also the solid core is convoluted to further reduce laminar flow.
Other than for appearance I am not sure that radiusing the fins will help. The sharp corners make a better heat riser, ie. heat transfer will be more efficient at the corners. FWIW the radii on the fins would have less surface area than the same fins with sharp corners.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: finned exhaust collars
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Joined: May 2012
Posts: 514 Likes: 2
Adjunct
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I like your idea of the reverse donut, you sure put a lot of thought and effort into making them. Yes the radius's on the fins would reduce surface area. I might change my thinking and instead of leaving the fin flat on top i could make them tapered on either side by grinding a V shaped form tool with a small flat on the top of the fin. I've just looked at mine and i already have a radius at the root. The fins are .125" wide on a space of .225" between fins with a full radius at the root. The bore is actually .450" and the OD is 1" so there is a .132" wall thickness. The coolers will be either 16 or 18" long when cut to the final length.
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Re: finned exhaust collars
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Joined: Apr 2008
Posts: 3,937
Loquacious
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Loquacious
Joined: Apr 2008
Posts: 3,937 |
Without pictures, IT NEVER HAPPENED!
(pictures, PLEASE)
And you may see me tonight
With an illegal smile
J. Prine
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Re: finned exhaust collars
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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OP
Learned Hand
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Posts: 1,174 Likes: 15 |
picture of what? the oil cooler? there are pictures here, scroll way down http://www.bonnevilleamerica.com/forums/...3&fpart=allif you are looking for pictures of the internals, I did not take any. I do have a drawing that it should be possible to post.
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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Re: finned exhaust collars
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Joined: Apr 2008
Posts: 3,937
Loquacious
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Loquacious
Joined: Apr 2008
Posts: 3,937 |
Yeah, those pic's are what I wanted to see.  Don't know HOW I missed them the first time around. As far as restricting the flow to allow the oil more time to dissipate heat in the tubes, that would also make the oil entering the tubes hotter from more time in the motor.  For every action, there is a equal and opposite action.  I'd op to allow the oil to flow more freely, with less pressure building from the restriction. On second thought, I'll re-visit just eliminating the external coolers completely, as discussed before. Less items/connections to get damaged, leak, or fail. 
And you may see me tonight
With an illegal smile
J. Prine
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Re: finned exhaust collars
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Joined: Jan 2008
Posts: 1,174 Likes: 15
Learned Hand
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OP
Learned Hand
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Posts: 1,174 Likes: 15 |
The coolers are sized to actually flow more volume than the incoming oil lines provide. So there is a pressure drop that occurs, the volume is constant. The intent is to provide the best cross section to surface ratio (within reason) with the greatest amount of turbulence. Laminar flow = low heat transfer rates. The oil to air temperature differential is small already so efficiency is limited no matter what The stock cooler is much more restrictive but that is part of how that type of cooler works. And outlet flow back to the sump is pretty much free fall. A better solution to eliminate the fitting and potential leaks would be to eliminate to root problem altogether, the oil. Build a frictionless IC motor and you are on to something
05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter
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