 » Site Navigation | | | | » Auction |
| | » B-T Recommends: |
| |  | 
Feb 23rd, 2009, 01:59 PM
|
#1 | | Has posted 500+
Join Date: Aug 2004 Location: So. Cal.
Posts: 611 Model: 98 FLHRCI Interests: Riding and working on HD. Riding to Sturgis as often as I can. Occupation: Project Mangement
| Polished Carb
Is it good to polish the inside of a carb?
This carb Im thinking of buying has been "performance upgraded" and the pic shows that it is polished on the inside. How advantages is this? | 
|  | |
Sponsored Links
| | | |
Feb 23rd, 2009, 05:42 PM
|
#2 | | Has posted 500+
Join Date: Jan 2009 Location: NE Indiana
Posts: 885 Model: HD FLHTC 93 Interests: Ridin-computers-woodworking Occupation: retired
| IMO - I wouldn't do it - Has something to do with fuel/air turblence - I'm sure there are others on this forum who could explain it better, but personnel experiance showed me it decreases performance. | |
| | |
Feb 23rd, 2009, 07:38 PM
|
#3 | | Has posted 500+
Join Date: Aug 2004 Location: So. Cal.
Posts: 611 Model: 98 FLHRCI Interests: Riding and working on HD. Riding to Sturgis as often as I can. Occupation: Project Mangement
| Thanks Sarge and I think you are probably right. I went ahead and bought it off ebay anyway. It comes with a Arlen Ness Big Sucker so I thought what the hell. It may only be polished on the front but I'll find out when I get it.
I am finally starting to collect parts for my swich over from the MM Fuel injection to carb so this is a good start I hope. | |
| | |
Feb 23rd, 2009, 07:41 PM
|
#4 | | Moderator Has posted 500+
Join Date: Jul 2005
Posts: 7,397
| good luck on finding the parts for the switch!!!! keep us posted on that!
__________________ 
LORD, HAVE MERCY ON AMERICA, WHILE WE ARE UNDER DISTRESS
"FLAGS AND HANDLEBARS SHOULD NEVER TOUCH THE GROUND"
"Lord, hold our troops in your loving hands. Protect them as they protect us. Bless them and their families for the selfless acts they perform for us in our time of need. Amen."  We plan to meet next week to talk about planning a strategy session to discuss the next step towards forming a consensus to start the development of the rough draft for the implementation of our intention to develop a plan.  | |
| | |
Feb 23rd, 2009, 08:14 PM
|
#5 | | Has posted 500+
Join Date: Aug 2004 Location: So. Cal.
Posts: 611 Model: 98 FLHRCI Interests: Riding and working on HD. Riding to Sturgis as often as I can. Occupation: Project Mangement
| Yeah I'll put a summary on the Projects area.
One thing I a looking into gathering info on is ignitions and dual fire coils. I'm thinking about picking up a Dynatech ign. I notice one that is computer programmable and stuff.
I'm not sure how to spec out the dual fire coils yet. | |
| | |
Feb 23rd, 2009, 09:20 PM
|
#6 | | More than 100 posts!
Join Date: Jan 2008
Posts: 199
| switch
i just swapped my efi for mikuni,,,all parts are in book,,,if you can get dealer to help,,,they do not want to,,,as they are only ones can tune,,,dyno,,, your bike and you realise the cost of that,,, what carb did you buy,,,need an easy kit for swap,,,plus i have big sucker ,,,think it is over rated,,, if you have carb to use,,,rest of cost is in less than 500,,,, pops | |
| | |
Feb 23rd, 2009, 10:23 PM
|
#7 | | Administrator Frequent Posting Club
Join Date: Jan 2005
Posts: 1,540 Model: Harley FLHX Interests: Harley's, Saltwater fish tanks, and inventing new ways to keep busy. Occupation: Web Specialist by day, 25+ years of carb building by day, hey what happened to my day?!
| I have polished the opening and venturi of CV carbs for years with very good results in both performance and dyno runs. On the other hand I don't polish the inside of the manifold as I've never seen any improvements.
That being said, I highly discourage anyone taking a polishing wheel to their carburetor throat. Without being aware of where all of the air bleeds and passages are located you could easily damage or clog something.
__________________
Enjoy the Ride!
Ken
Bike Talk Motorcycle Forum Admin | |
| | |
Feb 24th, 2009, 06:49 PM
|
#8 | | Has posted 500+
Join Date: Jan 2009 Location: NE Indiana
Posts: 885 Model: HD FLHTC 93 Interests: Ridin-computers-woodworking Occupation: retired
| Thanks kenfuzed - I forgot to mention that when I posted. There nothing more fustrating than trying to track down something like a plugged port in a carb. | |
| | |
Feb 24th, 2009, 08:46 PM
|
#9 | | Has posted 500+
Join Date: Jan 2007 Location: Michigan
Posts: 563 Model: Harley 02' Heritage Classic Interests: Riding Occupation: Riding - Semi Retired
| I agree with both Sarge and Kenfused. Polishing the intake side of the carb is OK, but not the manifold. You need the rougher surface in the manifold to create turbulance with the incoming air. The more turbulance the better the A/F mixture is atomized. Same thing with the heads. Back in the day it was thought that polishing the ports would improve performance. We now know that is not the case. Ok to polish the exhaust port, but not the intake side. Of course with EFI this is not a concern. | |
| | |
Posting Rules
| You may not post new threads You may not post replies You may not post attachments You may not edit your posts
HTML code is Off
| | |
|
Similar Threads | | Thread | Thread Starter | Forum | Replies | Last Post | | Stage 1 carb kit | guitarman | Motorcycle Tech Talk | 2 | Feb 12th, 2009 08:14 PM | | Carb | linda | Motorcycle Tech Talk | 1 | Jan 9th, 2008 08:48 AM | | XXX Carb | bikerputz | Motorcycle Tech Talk | 11 | Dec 11th, 2007 12:53 PM | | S&S Carb ????? Please help. | harleyc | Motorcycle Tech Talk | 6 | Dec 19th, 2006 05:54 PM | | S&S Carb help | Old Fart on 87FLH | Motorcycle Tech Talk | 7 | Jun 24th, 2006 12:07 AM |
|
