I’ve had mine for a few weeks now . Very solid engine . It’s on my mud boat . Paired with a mudskipper twister on a 1432 jon boat running 33mph bone stock !
I purchased the 500cc for my boys go-kart. I think it was a 212 predator that was on it. I had to modify this small go-kart a lot to make the Duromax fit but I think it will work. I've never done any of this before. This has definitely been an experience. The go-kart is only 150 pounds.
I wanna say the cones on the airbox are cyclone traps that help spin a bunch of the large dirt out of the air stream....Honda has cyclone filters on some of their GX engines. I can't wait to see this big boss hoss rip!
Those cylinders on the intake are like something that is on my Duramax. On my Duramax it catches water and debris before reaching my filter, and falls out the bottom. Can’t wait to see the power it makes!
The cups in the air filter are water traps.The holes are drains.That's a pretty good idea for all weather uses.It's pretty cool that Duromax has been producing so many good designs for us...uhhh,...for many normal and industrial apps ;)
Bike guy, you could be right, however I believe they are more specifically used to help prevent the filter from being clogged with larger particles too quickly (lengthening the usable service limits). Dusty sandy conditions can play hell on small engines, especially at construction sites. And they run just fine in the rain using the standard air filter cover found on Honda & clone type engines. Just my unsolicited 5 cents! 🍻
I enjoy the channel very much, well done to you guys. One thing I want to touch on is the exhaust valve sizes, exhaust valves are smaller because the cylinder is under pressure when the exhaust valve opens, so the pressure differential is very large compared to what occurs during the intake stroke. Because of this much larger pressure differential you don't need as large of a valve to expel the gasses, the gasses are more readily forced out. Cheers
the air intakes are to "spin" dust out of the intake air. its a features used in a lot of 4x4 air intake systems to reduce load and extend air filter life
So those cones on the intake look really similar to the cyclones you see on vacuum cleaners and the like. I think air is primarily supposed to come in the side, then water and debris gets flung out and falls down through the holes in the middle. Actually sort of clever if they don't just get immediately clogged.
Don’t feel anything you said is pointless ! Someone will always need that info. Thanks for all the videos, we all 💕 them ! What have you found to be the best carb for the buck $ I’m older and the mukuni clones have the hi/low mix on the bottom😢 It’s just not easy for me? Any info on this will be so appreciated, I’ll tell ten people how cool you are 👍✌️ Wife is awesomely smart! I don’t think 25% people know about exhausting! Great job guys
Man I love big displacement singles. I can't wait to watch your testing on that thing. I just ordered a 440 now I want the 500. Also I wonder if the intake pocket things spin air to clear out dust. We had something like that on generators
It's a typo or you overlooked something. It is 22.87 Nm (Newton Meters) 22.87 ÷ 0.73756214927727 = 31.00755647833893 ft. lbs. but it should be stock with exhaust and intake 25 hp + 37.5 ft. lbs. and 500cc engines range from 31 to 56 lb. ft. of torque. This is capable of up to 56 ft. lbs. and 41.3114 hp with heavy modification!
This is long, get a cup of coffee, a honeybun, a beer, whatever. I’m not positive about this, however the purpose of the oversized air box with the three intake ports, may have a two fold purpose. The first, the three small intake ports, as DuroMax doesn’t know that exact end use of their engines, may be large debris excluders. Grass clippings, large wood chipper dust, etc. and they look as if they’re molded to create three small swirl chambers that could have something to do with dust separation. Secondly, air intake noise can be loud. Automotive engine engineers spend countless hours changing the note/sound of intake air for various reasons. In automotive and light trucks, many times it’s for a more throaty sound. Who knows what you’re running, as long as it sounds tough. Also a deeper note has a longer wave length. Longer sound wave lengths are easier on the ear that a than a short wave length, higher note. Deeper notes can be achieved with a large air box with internal baffles. Maybe the round conical chambers also have something to do with the note. To me, it would be worth a call to your DuroMax supplier. The more you know… Here’s a tip those with large loud compressors in their shops. In a shop I owned, I completely changed, made much quieter, a large twin V two stage compressor by installing, of all things a 200 series Volvo rear muffler on the intake. The first stage inlet, where the original filter was mounted was the same diameter as the muffler inlet and outlet. I welded some brackets to securely hold the muffler to the top of the belt guard, and ran a length of 2” Gates fuel fill hose between the two. Then installed the original air filter on the other end of the muffler. It made a huge difference! You could cary on a normal conversation, without raising voices right next to the compressor. Another noise reducer is to mount the compressor, on large rubber motor mounts. (Again with the Volvo aftermarket parts) I used four right side (large) mounts with studs centered on each side. Mark where the leg mounting holes are on the floor, and drill holes into the concrete deep enough for the studs. Hopefully you know what to do with the other side of the mount. In the end, the decibels were greatly reduced with the intake muffler, and rouge vibration noise from the legs being on the floor was eliminated. It also kept the compressor from wandering out of its assigned work space. Hope there was some good in all of my old man ramblings. Really like your videos! Bart
That's quite the thumper! I (Yamaha FJ1200) used to go on day trips with my neighbor (1200 Gold Wing) and his wife who rode a Suzuki 600 single with a straight pipe. She kept up pretty well just cruising, but I would occasionally have to get a few miles ahead because it was stupidly loud and blew fireballs out the exhaust on deceleration. I guess what I'm saying is, a 500cc seems a bit large for a "mini-bike", but if we could get it to turn 12,000 RPM it could be fun on a go-kart. lol ;)
I've been anticipating one of these for my Ghost Face Killahwatt build. Should I just get a 440? I mean two ponies and I plan on a 34mmMikuni and a torque tube header.
That weird intake is similar to a Dyson vacuum or a gold refinement machine, it sucks air in a circle and up allowing other heavier particles to fall out the center like a reverse tornado.
I'm very interested in the 500. Please find out how much power it can make. It just became a candidate for something special I want to build. If seems like doubling the rated power isn't asking much for most utility engines and a reliable 40 HP will be enough for me.
I agree that torque number doesn’t make sense. I think the 459 predator is around 24.5 ft-lbs I can’t imagine a engine that is similar and 10% larger making significantly less.
Im thinking about build a Liberty cart 2 seater and will watching for more info on this motor. If the after market starts producing rods ect i might have to check this motor out. Has a beefy connecting rod as it is.
Sorry, that's not why. Actually, the exhaust port is always smaller than the intake because hot air flows twice as fast as cold air. For example, look at the air vents on a home without central air conditioning, small vents. Homes with air conditioning need larger vents about twice the volume. The reason hot air flows twice as fast is because the molecules are moving faster and it is less dense.
I need to line you out on what makes a hemispherical designed head. One of the main things is the valves. Your intake valves are on the intake, side of the head and your exhaust valves are on the exhaust side of your head. The piston is supposed to be a domed piston, and the spark plug is supposed to be in the center of the head.
The splayed out valves on this thing do in fact look like a hemispherical design. Edit: after seeing him pull the head, its a hemispherical for sure. Just a fairly flat one. The plug is offset a little to clear the valves, and they have used a dished piston to reduce the compression ratio.
Ted, these are lawnmower engines, not muscle car engines. The term hemi is used to describe the valve arrangement, where the valves are not parallel to each other on a flat plane, the valve stems are making a V shape if you will, which angles the valve seats to allow a semi-round or hemispheric combustion chamber. Piston design is irrelevant in this scenario. 🍻
Greatly appreciated, Mr. Red Beard, I do have a question for tall. Would you say it is without a fuel tank and filter if anyone has this information I would appreciate it.
I would definitely put this on a kart, not so much on a minibike.. not my minibike anyway, this wouldn't fit unless i setup a fuel tank to mount on the upper frame.
Liked your video. I have duromax XP13000EH generator 500CC 20HP engine that someone brought to me to see why it was backfiring, I have found the rocker valve pin ear broken on intake side, I'm looking for another head for this generator where can a person find parts for these engines. I've looked around on internet and only found, only in United Kingdom and it is on back order. I'm wondering is there any parts here in USA that sells parts for these Duromax. Thanks
@RedBeardsGarage how bout a vox or should I just 420 or 440 it I wish u did a vid on the duro420vs the 440 and the difference from the pull start or estart which is mo butter
Need to replace a blown GX270 engine in a go-kart. Would this bolt in? I have plenty of space. More concerned about bolt patterns. Thank you in advance.
@@RedBeardsGarage there’s a guy who did a tear down on one here on RU-vid , can’t recall the channel but it’s a much larger head so it will not fit the 440 platform . Everything about the 500 is larger , really the only thing useable from another bigblock are the carbs . I plan on cutting out my own exhaust flange and doing a 30or 32 mikuni since the stock carb is 28mm .
looks like this beast shares nothing with the 390/420/440 for aprts, looks like the 500 head wont fit on the 390/420/440 either, all we can do is a stage 1 for now, hope to see aftermarket parts for this beast soon.
There's zero aftermarket support for this engine at this point. It's not even close to a 390, 420, 440, or 460. Block, crank, rod, piston, head are different than the 440. The short skirt piston won't accommodate any billet rod made. ARC flywheels won't fit the crankshaft. The carb has something like a 28mm venturi. Everything is BIGGER.
That carb is not adjustable. That brass screw on top is just the pilot jet. That no one out there makes any different sizes with out drilling it out your self. There is a idle air screw but they have it capped an glued shut. Iv been all through this carb on my brand new 13k generator. That is surging. Here to find out digging into it more. They for got the insulator gasket on the head side. Causing it to suck air an run lean. Aka. The famous hunting.
