APT SmartCarb
- Thread starter gasgasman
- Start date
Jakobi
Super Moderator
Its a tricky topic. Ideal AF ratio is ideal AF ratio. Lean and rich conditions can be utilized to change curves and characteristics as seen in EFI tuning, along with timing. I'd like to think that if we have a carb that provides optimal fuel across the throttle range, then we can start to do more with the engine - port timing, port sizes, powervalve configurations, flywheel weights etc, timing, to set the power delivery to suit our needs. Thats just a thought though, and if anything I will miss my hard hitting needle configuration once my smartcarb arrives. I just hope it adds more everywhere enough to maintain the fun factor!
tuxedo dave
New member
Somehow i doubt you'll be disappointed.
GMP
Active member
Yes, I undersand all of this, I know its not like a traditional tapered needle. I was just wondering if its possibly another tool to use, thats all. I have a light flywheel so my bike revs a lot quicker than most.
The different metering rods are almost certainly to deal with carb signals that are outside the normal range of the correction ckts., like if you bolted one on your CR500 ice race bike I would imagine. Likely the same profile, just overall richer or leaner to bring the calibration back in range. The concept of multitapers and intentionally richening/leaning a specific area is one that you have to abandon when thinking about this carb.
The different metering rods are almost certainly to deal with carb signals that are outside the normal range of the correction ckts., like if you bolted one on your CR500 ice race bike I would imagine. Likely the same profile, just overall richer or leaner to bring the calibration back in range. The concept of multitapers and intentionally richening/leaning a specific area is one that you have to abandon when thinking about this carb.
OK. I did my fuel mileage test yesterday.
Filled the bike up before I left the house. Filled up my 2 1/2 gallon fuel can on the way to the trails. I haven't touched the fuel can until tonight.
Rode a total of 37 miles . Trail conditions were EPIC. Perfect traction.
Average speed for the 37 miles was 21-22mph. I rode as fast as I could safely go. It was race pace all day. Pretty much duking it out with my riding buddies for bragging rights.
Took the 2 1/2 gallon fuel can and topped off the bike. Had exactly 1 gallon left in the fuel can.
I had to double check several times as I could not believe I went 37 miles on 1 1/2 gallons!
Filled the bike up before I left the house. Filled up my 2 1/2 gallon fuel can on the way to the trails. I haven't touched the fuel can until tonight.
Rode a total of 37 miles . Trail conditions were EPIC. Perfect traction.
Average speed for the 37 miles was 21-22mph. I rode as fast as I could safely go. It was race pace all day. Pretty much duking it out with my riding buddies for bragging rights.
Took the 2 1/2 gallon fuel can and topped off the bike. Had exactly 1 gallon left in the fuel can.
I had to double check several times as I could not believe I went 37 miles on 1 1/2 gallons!
tuxedo dave
New member
Now if you did the same ride same pace same conditions with your stock carb then you would know for sure the improved fuel economy.
tuxedo dave
New member
Sounds good thanks for the report.
Jakobi
Super Moderator
OK. I did my fuel mileage test yesterday.
Filled the bike up before I left the house. Filled up my 2 1/2 gallon fuel can on the way to the trails. I haven't touched the fuel can until tonight.
Rode a total of 37 miles . Trail conditions were EPIC. Perfect traction.
Average speed for the 37 miles was 21-22mph. I rode as fast as I could safely go. It was race pace all day. Pretty much duking it out with my riding buddies for bragging rights.
Took the 2 1/2 gallon fuel can and topped off the bike. Had exactly 1 gallon left in the fuel can.
I had to double check several times as I could not believe I went 37 miles on 1 1/2 gallons!
And for those on the metric system
5.7L to do 60kms, or 10.5Kms/L
At race pace this isn't bad at all. I usually get around 10.6-11.4Kms/L depending on how hard I ride and conditions. Thats with a modified head and what I would consider to be near perfect jetting specs.
gasgasman. Any other modifications to your engine at all?
andoman
New member
Post #584 on page 59.
You know I always post the good stuff here first andoman.
Thanks, Corey. Seeing as how it all started here, I should have assumed that this was where I saw the info first.
siaknijustin
New member
I finally got the green light from the boss (wife) to place my pre-order for a 38mm Cast Smart Carb!
...Now I join those who've already begun to wait...C'mon May!
...Now I join those who've already begun to wait...C'mon May!
I finally got the green light from the boss (wife) to place my pre-order for a 38mm Cast Smart Carb!
Having never been married how exactly did that work?
I mean what did you do, say "Here Honey spend a few hours reading through this thread and I'm sure it will become clear to you too that this SC thing is worth checking out" ?
Or did you explain the possible mechanical innovation of the product in your own words?
Or did you just say, "It allows for better mileage so it will save us money in the long run". Not letting on that it may take 20 years to pay for itself.
