CV carb performance
CV carb performance
So I'm starting to do some research and getting a list started for when I can start buying stuff (albeit with approval from the wife, sometimes).
Since I'm gonna have the bike ripped apart I wanted to get some headwork done (thinking NRHS) with a Hi-Po cam. Looking at a Stage 2 CNC and not sure what cam yet but something set up for the street. I was looking at getting a carb but one of my buddies here says the CV carb will work if it's tuned right. Anyone have experience with this? Will it be sufficient or will I need to get a carb?
Since I'm gonna have the bike ripped apart I wanted to get some headwork done (thinking NRHS) with a Hi-Po cam. Looking at a Stage 2 CNC and not sure what cam yet but something set up for the street. I was looking at getting a carb but one of my buddies here says the CV carb will work if it's tuned right. Anyone have experience with this? Will it be sufficient or will I need to get a carb?
Road Captain
Joined: Sep 2008
Posts: 727
Likes: 1
From: Silverdale, WA
Look up Joe Minton, he has written several articles on Harley CV and Mikuni replacement carbs. Lots of tuning advice and reasoning behind it. Also addresses tuning for power vs real world, ie the need for reasonable fuel economy.
Up to around 90 hp the CV carb will do the job. It will never have the throttle response of a Mikuni HSR 42 but with proper tuning it will work. Go here to read more about our dyno testing of a Mikuni vs. a CV 40 carb:
http://nrhsperformance.com/tech_mikunivscv.shtml
http://nrhsperformance.com/tech_mikunivscv.shtml
I'm building a clean "rat" hot rod. I'm about to build an engine stand right now and send the frame out for prep and powder coat.
I don't have a particular goal in mind for the power I want, but I want it torquey, throaty, and just plain mean. Wanted to do stage 2 head work and was going to discuss with you choice on cams and carb. It's not my daily, so I want it to be thumpy with heavy cam. As my build process advances I'll be definitely contacting y'all.
Outstanding HDF Member
Joined: Nov 2010
Posts: 2,591
Likes: 68
From: Big Bear City, CA
You might want to look into having your CV "Performance Tuned" by Dale at Killer MC Products. A lot of positive feedback on his carb work has been posted in the "Evo Classic Models" sub-forum as well. He charges $200 to mod & rebuild yours, or $300.00 to purchase a modded CV outright. Custom modded for your bikes specs. Mine should arrive later this week but I probably won't have time to install it until next week. You can read more about it on his eBay auction: http://www.ebay.com/itm/270620924203...84.m1423.l2649
This is going to sound novice (because quite frankly I am), but I can remove the piston without removing the rod from the crank right? I'll do more research on that but since it's going to be apart I might as well do it.... can't wait!
Will this change displacement much, if at all? What kinda power am I looking at here?
What are the differences in the dome and flat top pistons. (please excuse my ignorance) Thanks!
Last edited by toxicstang99; May 30, 2012 at 01:40 PM.
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Intermediate
Joined: Feb 2012
Posts: 34
Likes: 0
From: Rochester, NH
Mikuni HSR42 is the way to go. Always had a flat spot with Keihin CV carbs. Mikiuni is smooooth!!!!
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I'm working on the Evo. I have it all torn down, just waiting to build an engine stand this weekend to remove the motor. Once I get the frame prepped and sent out to powder coating I'm going to get started on the motor.
Ok, thanks. I guess the best thing for me to do is call and discuss options. I'm thinking high compression, not sure the disadvantages though. If any. I'm not set on any particular cam, so I can choose based on what pistons I decide to go with.
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