APT SmartCarb
- Thread starter gasgasman
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Zman
Platinum Level Site Supporter
Additional SmartCarb Tech Questions
Hello Corey, I have a few questions related to the SmartCarb that I did not see covered yet (unless I missed them somewhere in the past 36 pages.
1) Is the SmartCarb is suitable for use with fuels that contain enthanol. 2)Can the SmartCarb be run with E85? 3) Since the SmartCarb has very fine fuel atomization is it more susceptible to plugged fuel passages (similar to a pilot jets propensity to getting clogged)? 4)Does it have any components that would be good to keep on hand as a spare? This sounds like a CV carb, so is there a diaphragm or seal that can wear over time? Thank you for the help !
Tim
Hello Corey, I have a few questions related to the SmartCarb that I did not see covered yet (unless I missed them somewhere in the past 36 pages.
1) Is the SmartCarb is suitable for use with fuels that contain enthanol. 2)Can the SmartCarb be run with E85? 3) Since the SmartCarb has very fine fuel atomization is it more susceptible to plugged fuel passages (similar to a pilot jets propensity to getting clogged)? 4)Does it have any components that would be good to keep on hand as a spare? This sounds like a CV carb, so is there a diaphragm or seal that can wear over time? Thank you for the help !Tim
Hello Corey, I have a few questions related to the SmartCarb that I did not see covered yet (unless I missed them somewhere in the past 36 pages.
Tim
No problem.
1. Yes the SmartCarb is suitable for ethanol blended fuels.
2. Yes the SmartCarb can be run with E85, requires a richer metering rod, same with straight ethanol.
3. There are no jets to plug, just a metering rod and a nozzle. The fuel inlet needle and seat can get dirt caught in them if no filter is used or fuel hygiene is not so good. The needle and seat can wear over time and may eventually need replaced. We have years of serviceable use though, and rarely replace them.
No CV diaphragm.
Corey
Our world has completely exploded right now (good thing) so our forum upkeep hasn't been that good lately, we do have news though. We have opened the account for the cast SmartCarb Pre-Purchase Program and have all the qualifiers in place. Barring any unforeseen issues we will be officially announcing the program next week. We will also be taking pre purchase orders for those wishing to continue purchases of the billet new build for the first of year. Improved bowl w/drain and overflow/tip over valves.
Corey
Thanks for the update Corey. I sent my SmartCarb off for testing in WA then it's going to WY for testing before getting back to me in VA . Awesome product you have. With the weather in VA this time of year looks like I'll be playing the turn the screws game with my RM250 until I get the SC back on my 165 Husky.
. Awesome product you have. With the weather in VA this time of year looks like I'll be playing the turn the screws game with my RM250 until I get the SC back on my 165 Husky.
The bowl we will send to you in exchange. The vent overflow valves for the billet's we are trying to achieve without any machining, but yet is unclear if we can or not. So possibly we will have them sent in for valve fitment.
Front Royalty
New member
I'd love a cast 38mm for my 300ecr
MattR
Super Moderator
Corey,
On the production cast version, how many of the critical features will be secondary machined? My concern will be that the cast version will have more dimensional variation. The billet version being all machined is easy to control the quality since everything is machined to tight tolerances. To keep costs lower in production, many of these same features will need to be "as-formed". Can you describe what steps are being considered to ensure the quality and performance matches the proven billet version?
Thanks,
Matt
On the production cast version, how many of the critical features will be secondary machined? My concern will be that the cast version will have more dimensional variation. The billet version being all machined is easy to control the quality since everything is machined to tight tolerances. To keep costs lower in production, many of these same features will need to be "as-formed". Can you describe what steps are being considered to ensure the quality and performance matches the proven billet version?
Thanks,
Matt
All mating surfaces of course will be machined, holes drilled and tapped.
The venturi shape is a critical feature that we will likely post process machine, and from looking at the first cast carbs that will be the case. Slide to body interface and clearances are also important. The cast carb will be a one piece body so opportunities for leaks are minimized. Weight, dimensions and durability are also key.
The remaining critical features are related to the metering rod/ nozzle interface and critical features to the MR. Floats and overflow/tip over valves have most of our attention currently.
andoman
New member
Which Cable? I'm off the Fence.
I'm ordering a billet straight 38mm as soon as they are in stock with the bowl improvements.
Only one question remains: Which throttle cable do I order from MP in order to have it hook up and work with the Smart Carb?
I'm most worried about the length of the pull. I will be getting a longer overall cable length.
I'm ordering a billet straight 38mm as soon as they are in stock with the bowl improvements.
Only one question remains: Which throttle cable do I order from MP in order to have it hook up and work with the Smart Carb?
I'm most worried about the length of the pull. I will be getting a longer overall cable length.
Hi Corey, below post was made in an Aussie forum regarding the smart carb by someone who is very knowledgeable regarding 'typical' carbs. Just wondering if you could offer your opinion on it? I would have thought the smart carb would offer temperature compensation to some degree?
Thanks
Thanks
Lot's of thinkers out there with good ideas. Anything that effects air density (temperature and humidity being the most relative) is compensated for by the SmartCarb. We have many people in the field riding throughout the day from 50 degree temps in the morning to near 100 in the afternoon and they run flawlessly. No need to have variable jetting; air is the driving force behind fuel pickup and properly configured (SmartCarb), fuel flow will always remain proportional to air density. Here's a quote from gasgasman.
"The SmartCarb is everything it claims to be.
I had some initial installation issues that have been ironed out.
My billet carb was the first one sold to the public. Maybe it was "rushed" to market.
It is all water under the bridge now. Well worth my time and effort to be a "guinea pig".
I was having jetting issues with the OEM PWK Air Striker II. One day the bike would run fine, next day we may have a temperature change and it would be hard to start etc.
The SmartCarb has solved all those issues. The bike starts with one kick all the time. Since I have had the carb on the bike, the temps here ranged from 110F to 50F-bike has ran flawless.
My bike detonated with the OEM Keihin carb. I had to run race gas to eliminate that. With the SmartCarb I have absolutely no detonation.
Roll on accelleration is awesome. Power just keeps building and bike pulls like a freight train. The motor revs fast when you want it to.
I have since added an ARROW pipe and the bike runs even better. Low end torque has increased.
Not having vent hoses was a plus for me. We have a lot of talcum powder dusty trails here and I would get dirt in the float bowl. No more.
If anyone has any real world questions about the SmartCarb, ask away."
Girard
