What About 4Stroke!
10-19-2009, 02:48 PM
#47
I don't believe they are making these engines anymore, or at least they're not importing them. You can try ebay.
06-06-2010, 11:36 AM
#48
Tech Rookie
You can find them on ebay from time to time. They'll range from $150 to $300 for a nib. Be sure to get the car version instead of trying to adapt an airplane version. They are completly different animals. Larger valves, different cam, and crank. The car version runs at much higher rpms. Os made two different displacements. The FS-26SC and the FS-40SC in both bump and pull start. Parts like cylinder sleeves and pistons are about half the price of good two strokes. You can also look for the kyosho superten. That's how I got my first engine. Bought a ragged superten with a great engine for a great price. There aren't a whole lot of supertens that have the four strokes but it's something else to look for. Good luck.
06-06-2010, 12:14 PM
#49
Here is Damon's website.
Click on products for info on how to purchase a kit!
http://www.thumprc.com/
Click on products for info on how to purchase a kit!
http://www.thumprc.com/
06-06-2010, 01:04 PM
#50
Well here goes, this is a video of my Losi 8t setup with a .52 four stroke.
Gearing in the video is 15/48 majorly under geared, run 18/45 now and its still not right. Ill get some track video up here soon.
OK, i just found out i can't post links yet? Anyways go to Youtube search,
Losi 4 stroke
Its named "4 stroke powered losi 8t truggy"
Gearing in the video is 15/48 majorly under geared, run 18/45 now and its still not right. Ill get some track video up here soon.
OK, i just found out i can't post links yet? Anyways go to Youtube search,
Losi 4 stroke
Its named "4 stroke powered losi 8t truggy"
06-06-2010, 02:47 PM
#52
Although i will agree with you that the "current" 4 stroke 450cc moto`s are superior in power to the older gen 250 2 strokes, i have to say that the reason you dont see them anymore on the track is emission laws, they outlawed 2 strokes for racing a few years back hence why every manafacturer jumped into 4 strokes.
The very first production 450`s werent as powerful as they are now and a well setup 250 2 stroke was still a faster, lighter and more nimble bike for racing, 4 strokes make it easier for the novice rider to go fast, making the sport more freindly for new comers, 2 strokes are an experts engine when you start making big power because the powerband tends to be narrower. But they are a lot cheaper to rebuild, have a lot less moving parts and weigh a lot less, the current 450 bikes are a bit over 100kg, whereas the factory 250`s of the late 90`s and early 00`s were more around the 90-95kg mark, thats a big difference in the air and under braking etc.
All these comparisons work hand in hand with R/C, the motocross industry were forced into engine changes from laws getting tougher, our industry hasnt got these laws and the cheap, light, simple nature of a 2 stroke IMO will be the reason we will stay that way for a few years to come, unless something comes along that forces change... although fuel and emissions arent a problem with alcohol fueled engines.
The very first production 450`s werent as powerful as they are now and a well setup 250 2 stroke was still a faster, lighter and more nimble bike for racing, 4 strokes make it easier for the novice rider to go fast, making the sport more freindly for new comers, 2 strokes are an experts engine when you start making big power because the powerband tends to be narrower. But they are a lot cheaper to rebuild, have a lot less moving parts and weigh a lot less, the current 450 bikes are a bit over 100kg, whereas the factory 250`s of the late 90`s and early 00`s were more around the 90-95kg mark, thats a big difference in the air and under braking etc.
All these comparisons work hand in hand with R/C, the motocross industry were forced into engine changes from laws getting tougher, our industry hasnt got these laws and the cheap, light, simple nature of a 2 stroke IMO will be the reason we will stay that way for a few years to come, unless something comes along that forces change... although fuel and emissions arent a problem with alcohol fueled engines.
as for the weight, you don't even notice it. the reference to braking isn't really applicable since the engine-brake of the 4 strokes is so crazy. as you go through acceleration bumps, the bikes track so much better too, which makes them feel 10x lighter (you don't have the bike swapping all around under you). also, they are much easier to jump.
in RC, it's awesome to watch a little 4 stroke rip around. however, for all those ex mx-ers at the track, nothing beats the current sound of 1/8s racing. the sound is as close as you can get to the old mx days
06-06-2010, 03:00 PM
#53
Somewhere in the old EFRA ruling for 1/8 onroad cars there is a limit for .21 2-stroke (still a standard rule) and .40 for 4-stroke, I think the FS40 would be the better choice but the .26 has a better (almost direct) fit.
I did do a search on the web and found on youtube also some movies about tuning these engines giving more torque and RPM.
I did do a search on the web and found on youtube also some movies about tuning these engines giving more torque and RPM.
06-06-2010, 03:20 PM
#54
.26 wouldn't do the trick in 1/8th scale. Wouldn't even stand a chance.
.54 would be the way to go. The better Saito mills are smaller than you'd think and really light. Besides, my car feels way better as a heavy Electric thn it did as a light nitro.
A conversion would need a complete chassis, motor mounts, possibly center CVD's if they move the center diff, flex tube to connect the muffler, giant clutch bell pinion gear, heavy flywheel, and an extra large cooling head.
Sounds like something BCE or Techno could pull off. Surprized none of the big RC companies have jumped on this.
The sound, idle, reliability, and fuel economy can't be beat. All my nitro airplanes have been 4 strokes, even my trainers. My bigger planes are gasoline.
.54 would be the way to go. The better Saito mills are smaller than you'd think and really light. Besides, my car feels way better as a heavy Electric thn it did as a light nitro.
A conversion would need a complete chassis, motor mounts, possibly center CVD's if they move the center diff, flex tube to connect the muffler, giant clutch bell pinion gear, heavy flywheel, and an extra large cooling head.
Sounds like something BCE or Techno could pull off. Surprized none of the big RC companies have jumped on this.
The sound, idle, reliability, and fuel economy can't be beat. All my nitro airplanes have been 4 strokes, even my trainers. My bigger planes are gasoline.
06-06-2010, 03:37 PM
#55
Tech Initiate
.26 wouldn't do the trick in 1/8th scale. Wouldn't even stand a chance.
.54 would be the way to go. The better Saito mills are smaller than you'd think and really light. Besides, my car feels way better as a heavy Electric thn it did as a light nitro.
A conversion would need a complete chassis, motor mounts, possibly center CVD's if they move the center diff, flex tube to connect the muffler, giant clutch bell pinion gear, heavy flywheel, and an extra large cooling head.
Sounds like something BCE or Techno could pull off. Surprized none of the big RC companies have jumped on this.
The sound, idle, reliability, and fuel economy can't be beat. All my nitro airplanes have been 4 strokes, even my trainers. My bigger planes are gasoline.
.54 would be the way to go. The better Saito mills are smaller than you'd think and really light. Besides, my car feels way better as a heavy Electric thn it did as a light nitro.
A conversion would need a complete chassis, motor mounts, possibly center CVD's if they move the center diff, flex tube to connect the muffler, giant clutch bell pinion gear, heavy flywheel, and an extra large cooling head.
Sounds like something BCE or Techno could pull off. Surprized none of the big RC companies have jumped on this.
The sound, idle, reliability, and fuel economy can't be beat. All my nitro airplanes have been 4 strokes, even my trainers. My bigger planes are gasoline.
I think gearing is the biggest problem as everything is made for a high rpm two stroke.
06-06-2010, 03:51 PM
#56
I agree. Going to need a small, allmost as small as the center diff case size, ring gear on the center diff.
Otherwise the pinion would be so big it would move the engine too far out.
Otherwise the pinion would be so big it would move the engine too far out.
06-06-2010, 03:59 PM
#57
Tech Initiate
the nitro clutch bells pinion's don't go high enough in teeth.
some spur gear do go plenty low enough though.
06-06-2010, 04:29 PM
#58
Supercharger, Turbo, Nitrous?? Iv thought about all of them, they would add unwanted weight to the car/truck though. My 8t is already to heavy with the .52 4 stroke conversion... Added 4 stroke motor weight, fuel pump, fan setup, big steel flywheel, motor mounts and bigger clutching.
06-06-2010, 04:35 PM
#59
Search Losi 4 stroke on youtube i have 2 videos of my truck on there.
06-06-2010, 04:40 PM
#60