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horn5390
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« on: August 19, 2014, 02:34:41 PM » |
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anybody out there polished their intake tubes and noticed a difference to make it worth doing? better mpg? crisper throttle? smoother throttle?
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if you aint had to lay her down, you don't ride enough
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Attic Rat
Member
Posts: 446
VRCC # 1962
Tulsa, OK
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« Reply #1 on: August 19, 2014, 03:31:13 PM » |
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Don't waste your time on a stock bike. It is not worth it
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The Attic Rat Performance Works
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R J
Member
Posts: 13380
DS-0009 ...... # 173
Des Moines, IA
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« Reply #2 on: August 19, 2014, 04:01:25 PM » |
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Don't waste your time on a stock bike. It is not worth it
10-04 on what Attic Rat says. |
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44 Harley ServiCar   |
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98valk
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« Reply #3 on: August 19, 2014, 04:07:30 PM » |
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I picked up a solid 1-2 mpg avg, I had to turn the idle down twice indicating it was working. first time I used 120 grit, second time went to the 320/80 grit as noted below.
intake manifold needs to be 400 grit smooth, take a look at any rubber in-line four IM, very smooth. even car/truck IMs have smooth runners, this smoothness is also noted as needed in design books for individual runner multi-carb, systems such as weber etc.
the finest flapper wheel avail or that I could fine is a 320 grit. try not to enlarge the dia only make smooth. then finish off with 60-80 grit for the short radius, to balance out the flow.
it works if done as noted, people who say it doesn't work just do the 60-80 grit as first posted by LaMonster.
please do not confuse with the intake runner port of the head, rough from the factory is best for mpg and midrange performance, smooth exhaust port head is ALWAYS beneficial. smooth intake port is good for high rpm power. hrs of flow bench testing of intake port reshaped and smooth can provide the best of both worlds but big $$$$.
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1998 Std/Tourer, 2007 DR200SE, 1981 CB900C 10speed
1973 Duster 340 4-speed rare A/C, 2001 F250 4x4 7.3L, 6sp
"Our Constitution was made only for a Moral and Religious people. It is wholly inadequate to the goverment of any other."
John Adams 10/11/1798
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horn5390
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« Reply #4 on: August 20, 2014, 04:57:06 PM » |
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right now my usual mpg is 37. anything that could help I would be willing to do. that flapper sanding wheel is only 4 bucks at the auto store. if I gained 1 or 2 mpg I would say its worth 1 hour of my time.
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if you aint had to lay her down, you don't ride enough
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The emperor has no clothes
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« Reply #5 on: August 20, 2014, 06:15:28 PM » |
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right now my usual mpg is 37. anything that could help I would be willing to do. that flapper sanding wheel is only 4 bucks at the auto store. if I gained 1 or 2 mpg I would say its worth 1 hour of my time.
37 mpg average? I would say you are doing good, my avg. is in the 32 mpg range. |
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sixlow
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« Reply #6 on: August 20, 2014, 06:54:25 PM » |
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right now my usual mpg is 37. anything that could help I would be willing to do. that flapper sanding wheel is only 4 bucks at the auto store. if I gained 1 or 2 mpg I would say its worth 1 hour of my time.
37 mpg average? I would say you are doing good, my avg. is in the 32 mpg range. All due mostly to speed or RPM range, i get 32 mpg when solo and 37 mpg when 2 up ? why, because I do about 75 to 85 mph solo (heavy wristed) commute on highway and when 2 up we take more back roads and putt around at about 55 to 65 mph. that alone changes my mpg that much, looking forward to putting my new Austone tire on soon as the added height of the tire drops the rpm's down about 300 rpm at highway speed, hence better mileage. YMMV.  |
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« Last Edit: August 21, 2014, 03:30:42 PM by sixlow »
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Patrick
Member
Posts: 15433
VRCC 4474
Largo Florida
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« Reply #7 on: August 21, 2014, 03:23:43 AM » |
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Cleaning the intakes is one the first things I did. I didn't really polish or smooth them , just knocked most of the snots off them. I did it just for the heck of it when everyone thought like the thing to do.
I can't say it helped, but, I've always gotten 40+ MPG.
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zzed28
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« Reply #8 on: April 24, 2015, 07:47:24 AM » |
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I realize this is a rather old thread . No less an authority than,, David Vizard,, Mr, I dont have an opinion, I have a dyno,,,,,,, concurs with Attic Rat here. If you want to knock the booggers off the interior of the intake, it maybe will help, but there is no appreciable power to be had on a street machine by polishing intakes. Polishing to a mirror is only effective, on the combustion chamber and basically then is to minimize carbon buildup that may cause detonation. But with our Valks, the compression is low enough that detonation is not a problem stock.
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O-B-1
Member
Posts: 222
Show ain't over until the Fat Lady sings
Vancouver, WA
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« Reply #9 on: April 24, 2015, 08:03:26 AM » |
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I polished mine with chrome polish... The chrome looked so much nicer and my mileage increased, the throttle response was crisper, I even blew away a Harley Davidson. So, I thought if chrome polish on the runners could do that, what the heck, I'll try Mothers on the rims! Holly Crap, Batman! I blew away a Mazda MRX!  Sorry, just had to... If you have a Valkyrie, stock or what, I believe you have the best bike ever produced, performance wise. The only other thing I can think you might do is a multiport fuel injection and 6-6 exhaust with 6 O-2 sensors feeding the computer, and maybe the Austone tire with larger diameter if mileage is what you want. |
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David W. Mitchell
1999 Honda Valkyrie GL1500C
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Grandpot
Member
Posts: 630
Rolling Thunder South Carolina Chapter 1
Fort Mill, South Carolina
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« Reply #10 on: April 24, 2015, 08:38:46 AM » |
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If you get 37mpg, I wouldn't touch it. How much improvement can you expect?
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 Experience is recognizing the same mistake every time you make it. |
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Roadog
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« Reply #11 on: April 26, 2015, 01:39:08 PM » |
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OK,..On the valkyries the intake runners (manifoilds) out flow the intake ports on the heads by a few CFM stock . that was measured on my flowbench a few years ago. some may remember my post on that. SO...making the top of the funnel larger has no real benefit. The restriction is in the intake port and NOT the runner. anyone who has ever been to the dragstrip can tell you the seat of the pants is NOT always right. Just wanted to throw that truth out there. Also when we finish intake ports, manifolds even chambers we finish with 60 grit, nothing smoother. Helps keeps the fuel in suspension, now on fuel injected ( not including throttle body engines) engines you can go up to 120 grit but no benefit above that.
Terry
Owner Flowtech Eng.
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