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Members: 605 | Total Threads: 50,801 | Total Posts: 518,376 Currently Active Users: 366 (0 active members) Please welcome our newest member, ian66 |
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25-03-2015, 05:07 AM | #1 | |
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25-03-2015, 07:53 AM | #2 |
Bockloks
Join Date: Jan 2012
Location: London
Bike: No Bike Yet!
Posts: 4,601
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Do both to get max extension
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25-03-2015, 09:56 AM | #3 |
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I,m not a lover of Rose joint extenders to be honest, but these that I have fitted are the McGill version which have a longer threaded part than the originals anyway, which is what Utopia spotted ( as engineers do )
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25-03-2015, 12:38 PM | #4 |
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You ever up for visitors from across the border? My bikes ages away from the road but it would be great to stand around in a garage talking bike
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29-03-2015, 09:32 PM | #5 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,545
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I notice that you've put a nice polish on the inlet stubs.
I'm very likely to do the same someday. Now, I realise that the difference it makes is miniscule but, just for interest's sake, what are your thoughts on whether the shiny surface is better for the carburation, or worse. My thoughts are that it may well be better, as the polished surface would absorb less engine heat than the original, slightly matt finish ( thus keeping the mixture cooler). If the shine makes it worse though, even by a tiny amount, then I probably wouldn't bother. Shiny is nice, but not at the expense of efficiency. That would be sacrilege really. |
30-03-2015, 08:38 PM | #6 | |
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30-03-2015, 01:44 AM | #7 |
1/2 man - 1/2 pogo-stick
Join Date: Aug 2002
Location: Dartford, Kent
Bike: M900ie
Posts: 7,241
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I think 19mm is a common size for many of the breather outlets
But it's a good idea to check it first http://www.ebay.co.uk/itm/19mm-Engin...item2edeff3107
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GT Fully paid up member of the S.A.S. (Scottoiler Appreciation Society) 27,000 miles on original chain - and still going strong! |
30-03-2015, 10:15 PM | #8 |
No turn left unstoned
Join Date: Jun 2010
Location: leicester
Bike: M750
Posts: 4,545
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I'm sure that the heat transfer between the inlet tubes and their surroundings would be less for the polished tubes, but the question is.. are they losing heat to cold surroundings or gaining it from warm surroundings due to the heat from the engine combined with their position in a little nook between the cylinders where they may get less airflow.
My original statement implied that they were in a warmer environment, but I'm not at all sure that assumption is correct. It fact, now that I think about it, it probably varies with speed. I guess they'd be heating at standstill though. But, like you, I'd probably polish them anyway ....unless it was known to be detrimental. I'm a sucker for the look of polished ally, but I also like its honesty and simplicity. |
31-03-2015, 09:43 AM | #9 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,834
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I wouldn't like to get involved in arguing whether it was good or bad for the inlet tract to be warm or cool, but.
Experience with Ajay and Matchless twins taught me that it is very undesireable for the heat to transfer to the carb(s). They would suffer terribly if no insulation was provided from the heat. The original fitment was a "Paxolin" or "Bakerlite" gasket which went between carb and manifold...So the manifold was still allowed to get hot with no ill effect...And was frequently polished. I would say that the Ducati set up with large rubber adapters to mount the carb to the tubes would provide ample heat insulation..........Polish away.. |
31-03-2015, 08:38 PM | #10 | |
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Quote:
Common sense tells me to agree with Mr. G. (again!) Key statements here seem to be "So the manifold was still allowed to get hot with no ill effect...And was frequently polished" and "I would say that the Ducati set up with large rubber adapters to mount the carb to the tubes would provide ample heat insulation..........Polish away" |
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31-03-2015, 12:38 PM | #11 |
You Are What You Is
Join Date: May 2005
Location: A Foward Location
Bike: S4r
Posts: 1,948
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These days, it is considered detrimental to engine performance to polish inlet tracts.
Polishing inlet tracks would have an unmeasurable effect on heat transfer. Not considering the latent effect of the fuel vaporization. An elementary knowledge of thermodynamics would substantiate this. It was never about temperature, rather an attempt reduce boundary friction, often as a result of port modification. Ducati inlet tracts are produced on a 5 axis mill so they are all identical Last edited by Capo; 31-03-2015 at 12:43 PM.. |
31-03-2015, 01:25 PM | #12 |
Lord of the Rings
Join Date: May 2013
Location: Norwich
Bike: M900sie
Posts: 5,834
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Not sure if I am blinded by science or baffled by bullshine, but I did'nt understand a word of that, Capo..
I think you may have taken a swerve and moved the discussion to the inside of the tract rather than the outside. Polishing the inside has been proven to be worse than a rough finish. the best being a dimpled surface like a golf ball apparently. at least that is what they found at ERM when I used to visit them in the early 90's...They did a lot of work on 7R and G50 heads...As indeed did the AMC race shop in the 50's and 60's....Williams is a name that springs to mind. |
31-03-2015, 05:22 PM | #13 |
You Are What You Is
Join Date: May 2005
Location: A Foward Location
Bike: S4r
Posts: 1,948
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Oh......
In which case the discussion on temperature effects is even more ridiculous. |
31-03-2015, 06:29 PM | #14 |
Bockloks
Join Date: Jan 2012
Location: London
Bike: No Bike Yet!
Posts: 4,601
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Wrong on so many levels!
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03-04-2015, 05:26 PM | #15 |
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Insulate the tracts from the carbs at the head and it would be much better, my goldie runs loads better now I have the heat transfer issue sorted at the inlet tract to head interface.
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