C
canucklehead
Well-known member
I ran a set of cutlers 48's on my old bigbore and I never found much use for the lower powerjets.
Carbed 2 stroke turbo guy's !!!
- Thread starter gus bohne
- Start date
I only use the midrange one. It does help add to the needle, but the lower one seems to be a waste. I often wonder, since they share the same supply tube, if at part throttle if the vacumn/draw on the lower one wouldn't pull air from the mid instead of fuel from the bowl.
G
gtfoxy
Member
If I understand your question and the functional operation of the powerjets: The jet can not draw from another orifice propelled buy the same systemic energy. Don't view the fuel as being drawn into the carb orifice, yet see it as being pushed... From a diiferential of pressure. Only way would be if the pressure head at the throttle blade were high enough to counter act the lower pressure differential at the bottom....
The bottom one doesn't seem to matter is, in my view, because the main circuit is already saturating that portion of the air mass that any additional fuel introduced in this area of the carb orifice would simply be prone to falling out of suspension and puddling.
This would impact detonation tendencies under high preceeding combustion temperatures in the chamber, or heads with especialy high ejection velocities or poor wave propogation control.
Tony, you are correct. the common feed is the problem.
its much easier to pull air than liquid. hence the mix would be leaned not enriched when using both of those common feed circuits.
A carburator is a siphon,, no more technolgy than that.
I now have a set of said 48 cutlers to work with,, lots of little leaks and stuff to clean up..
Gus
its much easier to pull air than liquid. hence the mix would be leaned not enriched when using both of those common feed circuits.
A carburator is a siphon,, no more technolgy than that.
I now have a set of said 48 cutlers to work with,, lots of little leaks and stuff to clean up..
Gus
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gtfoxy
Member
So the head pressure is greater than fuel pressure minus bottom pressure differential? There is that much turbulent air mass present there?
A siphon is a great example... They are powered by head pressure of the liquid column correct? The air pressure drop as the air mass is accelerated in the narrower venturi creates a drop in pressure right....?
Then is that why you recomend increasing bowl pressure under possitive manifold conditions beyond actual manifold pressures or am I not understanding that correctly?
I mean to say I know of you using pipe pressures to raise fuel pressure but didn't I see you mention something on increasing bowl pressure beyond static differentials or no?
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Hey Chris,
I may not have described the scenario very well. I understand pressure differentials, but for simplicity sake, I use the term vacumn instead of low pressure area. Also invision these two power jets adjacent to the slide one above the other(aprox 1/3 and 2/3 bore) Both of the side power jets are fed from a hard tube circuit into the float bowl.
So, we have three pressure sources(orifaces) all tied together. As the slide is barely raised(maybe 1/4 throttle) the open(1/2 turn) lower power jet is exposed to the air stream first and the low pressure scenario. The open(three turns) mid power jet doesn't see the velocity or low pressure yet so it may still be at the same pressure as the float bowls. If so, it may be easier for the air to be displaced than the fluid sitting at a lower elevation?
Whew! That was a hard way of saying what I was wondering.
Not sure about the rest of your theory, regarding saturation or effects on the motor.
Yer a smart feller! I'll bet ya get em sealed up pretty easily. If ya want give me a call and I'll talk about what I have done and seen with these carbs. This week, I relieved a set of slides to lean up the bottom. I think it'll be easier to jet for me. Hope I didn't go too much.....
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gtfoxy
Member
Yep thats what I was getting at for the most part... There would have to be greater pressure than in the bowls feeding the "mass acceleration" through all the various active circuits. One circuit added to another increases the volume of the cicuit flow as a whole seen on the bowls overall pressure, if you follow me.... More straws in the drinking glass so to speak.
Over saturation of a medium results in one thing; what ever is being put into the medium droping out of suspension.
bov
Hey Gus is a bov needed on a aero 53,I have no run on without it but was told it helps turbo life,I run 20+ lbs of boost.
Hey Gus is a bov needed on a aero 53,I have no run on without it but was told it helps turbo life,I run 20+ lbs of boost.
D
DragonFreak
Well-known member
i have an 07 600 with a turbo. THis is my first turbo and i need to know where to start. I have a powerjet on my turbo and on my carbs. My sled bogs bad on the bottom and mid range and pulls pretty good on boost. I think i am running rich but dont dare close my powerjets. The jet on my turbo is like only 3/4 turned out does this seem right? I need help asap
You are rich.
What is your jetting? Mains, needles, needle jets, pilots?
What jetting did you change when you put the turbo on?
What style powerjets do you have and how far out are they turned?
What is your jetting? Mains, needles, needle jets, pilots?
What jetting did you change when you put the turbo on?
What style powerjets do you have and how far out are they turned?
D
DragonFreak
Well-known member
I bought the turbo from a guy who had reggie sanders set it up. I am not sure on what is in there but i will have to go check.
The more info you give the more we can help, also what elevation you ride will help.
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DragonFreak
Well-known member
i dont know what jets its what ever reggie put in. It has stock needles in the top clip hole. my powerjets or about 1 turn out or so. But i was just looking tonight and the boot from my turbo to the intake tube was cracked so i think that might cause the bog.
Boost leaks will make it do that. Fix that and let er rip.
I recently purchased an 01 polaris 700 with a 53 aero turbo at 10 lbs, powerjets, and running turbo doc's setup. The motor was moved into an 03 edge chassis with fresh pistons and turbo rebuild last spring and has now had it's first couple tastes of fresh pow since the transition to the new chassis. Here's the problems i'm having. When I start pulling through the powder hard on the flat or especially on a hill it will run very well at first pulling strong rpm's and 10 lbs of boost. Then it will fall on it's face comming almost to a stop but if I work with and stay on the throttle it will choke and squirm sometimes comming back to full boost and power before it does it again. It is not predictable when it will happen. One important piece of the puzzle is that we were in unbelievable powder with snow stacked on the hood and vents. The screens have been removed from the hood so I was stacking snow in the nose of the sled around the pipe and I know my air delivery to the turbo contained some snow and some hot underhood air. I just cannot understand what would cause the motor to go from working incredible to a hard stall. Could it all be related to my air intake or snow in the motor compartment? When we leave the truck at 8000 feet and ride 5 miles up the road to 10000 ft it seems to run perfect. Obviously the motor isn't working as hard on a somewhat packed road and i'm not ingesting snow under the hood or down its intake like I would in the fluff. Plug change makes no difference. Fuel pressure is staying at 15 lbs (I will watch that close next time). I have been hesitant to lean it up any more as I am new to the turbo world and want more knowledge before I crank the powerjets shut too much when I have other things to be looking for. I know im long winded here but want to try and describe it the best I can. ANY sugestions and info would be very appreciated.
Wheres your exhaust exiting at?
Sounds just like when mine was powder bogging. It would nearly kill the engine on mine, until I changed to side exit exhaust. Its way worse with the turbo than it was with the twin pipes before.
Sounds just like when mine was powder bogging. It would nearly kill the engine on mine, until I changed to side exit exhaust. Its way worse with the turbo than it was with the twin pipes before.
Exhaust exits out the stock hole and I have had concerns about it plugging. I built a deflector but im not sure it is doing the job. The turbo discharge pipe angles forward away from the turbo to the belly creating a perfect angle to shove snow up its guts. Short of redirecting the exhaust any suggestions how to deflect the snow?
Other than putting a deflector on I don't have any ideas. My solution was side exit exhaust and I love it.
Does Aero build a side exhaust kit for an older 53? Anyone have pic's?
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