64LikesOS FS26S-C 4-stroke development
09-28-2007, 09:00 PM
#691
DP-Buggyboy.............you have PM..........
10-01-2007, 07:07 AM
#692
Hi guys, ive been reading this thread for about a year now with great enthusiasm, and i really belive that fourstroke engines are going to be the future in rc cars.
I own a LSP pro r truggy and am very keen to convert it to a 4stroker. Would it be possible for someone to list everything i would need to get this project happening??? I understand its not just as simple as dropping the fs in but it would be great to get one going at my club as alot of people would be interested.
I also own a MT2 18SS which may be suited to the fs-26, i know the HPI rs4 evo 2 speed would be a straight drop in in the MT2 as well.
I really love the work you guys have done developing four-strokes to adapt to land based RC, and I really hope that you can help me build one of these myself..
Thanks in advance...
Rob
I own a LSP pro r truggy and am very keen to convert it to a 4stroker. Would it be possible for someone to list everything i would need to get this project happening??? I understand its not just as simple as dropping the fs in but it would be great to get one going at my club as alot of people would be interested.
I also own a MT2 18SS which may be suited to the fs-26, i know the HPI rs4 evo 2 speed would be a straight drop in in the MT2 as well.
I really love the work you guys have done developing four-strokes to adapt to land based RC, and I really hope that you can help me build one of these myself..
Thanks in advance...
Rob
10-04-2007, 08:15 AM
#693
Good news!
After trying many different carbs on my cheap version of a side-intake head for the .26, I've finally found the first one that works really good. It's the Associated rotary carb that comes on the GT2 RTR .15 engines. It doesn't even need a fuel regulator the way it's installed in my GT2 kit proto.
This is good, because it's half the cost of the O.S. carbs I've been working with, and the regulator is $60. That should make the kits cost about $90 less than what I was looking at before.
This is good, because it's half the cost of the O.S. carbs I've been working with, and the regulator is $60. That should make the kits cost about $90 less than what I was looking at before.
10-04-2007, 08:50 AM
#694
Tech Adept
On your revo O.S. 52 powered thumper how was the power comparison to the 21 powered powered rigs. Also knowing that you are a very good racer. and will you be making any 52 powered kits? thanks
10-04-2007, 10:16 AM
#695
I really want to.... I'll be getting an 8ight-T this winter, and an Alpha 56. The .52 is discontinued, so I won't be putting any more R&D time into it. Besides, the new head design and beefier rod on the new .56 really looks like it will handle high-RPM duties very well. The .52 revs pretty happily, but the head could flow better, and the bottom end of the rod stretches a little.
...but yeah, the .52 is pretty comparable to .21 2 stroke power. My roomate actually put the .52 from my monster truck in his Jammin' CRT, and it works pretty good. The biggest problems are fuel pressure regulation, muffler falling apart, and clutch wear - although the clutch lasts about as well as any truggy clutch, which is to say about 20 tanks on Kingz Headz 7075 shoes (installed backwards) with 1.0 springs. I'm really curious about how an M2C clutch setup would work.
Also, they HAVE_TO_HAVE_A_GOOD_COOLING_FAN! I saw first-hand what happens when a .52 is run hard for 10 tanks back-to-back without active cooling.... Ring loses all of its tension, rod wears, intake valve breaks, LOTS of carbon builds up on exhaust port and valve.
Remember, these engines were designed to have a propeller bolted to them, and run at half the RPM we run them at (they come with a puny little 6mm rotary carb, and the RESTRICTED carb I use is an 8mm slide). Without an aggressive fan cooling them, they will cook themselves to death.
...but yeah, the .52 is pretty comparable to .21 2 stroke power. My roomate actually put the .52 from my monster truck in his Jammin' CRT, and it works pretty good. The biggest problems are fuel pressure regulation, muffler falling apart, and clutch wear - although the clutch lasts about as well as any truggy clutch, which is to say about 20 tanks on Kingz Headz 7075 shoes (installed backwards) with 1.0 springs. I'm really curious about how an M2C clutch setup would work.
Also, they HAVE_TO_HAVE_A_GOOD_COOLING_FAN! I saw first-hand what happens when a .52 is run hard for 10 tanks back-to-back without active cooling.... Ring loses all of its tension, rod wears, intake valve breaks, LOTS of carbon builds up on exhaust port and valve.
Remember, these engines were designed to have a propeller bolted to them, and run at half the RPM we run them at (they come with a puny little 6mm rotary carb, and the RESTRICTED carb I use is an 8mm slide). Without an aggressive fan cooling them, they will cook themselves to death.
Last edited by DP-buggyboy; 10-05-2007 at 08:00 AM.
10-11-2007, 02:39 PM
#697
Tech Rookie
ST-1 Pro with OS FS-40-S-CX
Hello,
my name ist Christoph, I'm from Germany. This year I had the chance to realize my first 4-stroke-project. It is a ThunderTiger St-1 Pro with an OS FS-40S-CX. I like to present some fotos of my new "baby": By the way, sound of a 4-stroke is fantastic und the whole car works great!
my name ist Christoph, I'm from Germany. This year I had the chance to realize my first 4-stroke-project. It is a ThunderTiger St-1 Pro with an OS FS-40S-CX. I like to present some fotos of my new "baby": By the way, sound of a 4-stroke is fantastic und the whole car works great!
10-12-2007, 06:51 AM
#699
Tech Rookie
It is the flywheel, that coms with the Kyosho 4 stroke conversion kit GTW-50. It is made from steel and weighs ca. 65 grams. But there is one big disadvantage, it has got just two pins, so you are forced to find a durable 2-shoe-clutch. I took an old carbon cltuch, that I found in my toolbox, but I think I will try the KC-45 by Kyosho if the old one is worn out.
10-15-2007, 03:33 PM
#701
Tech Adept
Can someone tell me what makes the difference in the clutch by running the shoes backwards with the fourstrokes.. thanks
10-19-2007, 07:36 AM
#703
Tech Rookie
direction of connecting rod - FS-26S
Hello,
the connecting rod of the FS-26S has a front and back. where is the difference and what is the right position?
the connecting rod of the FS-26S has a front and back. where is the difference and what is the right position?
10-22-2007, 08:05 AM
#704
On the big end bushing, one side of it has a slight chamfer, and the other side is a square edge. The chamfer side goes toward the front of the engine.
...and the backwards clutch setup just grabs harder and usually earlier. I've actually ran a 2 shoe carbon clutch (full-face wrap-around-spring MIP style) with success without running it backwards, but most clutches work better with the shoes in backwards on the .26.
Now, on larger 4 strokes, I have found that only a reversed 7075 aluminum clutch shoe (THAT DOESN'T DRAG AT IDLE) will really get the job done without wearing out too quickly. I would imagine a 3 or 4 shoe M2C 7075 clutch setup installed backwards would work VERY well, though I haven't personally tried one yet. - I will when I do my Alpha 56 powered 8ight-T this winter!
...and the backwards clutch setup just grabs harder and usually earlier. I've actually ran a 2 shoe carbon clutch (full-face wrap-around-spring MIP style) with success without running it backwards, but most clutches work better with the shoes in backwards on the .26.
Now, on larger 4 strokes, I have found that only a reversed 7075 aluminum clutch shoe (THAT DOESN'T DRAG AT IDLE) will really get the job done without wearing out too quickly. I would imagine a 3 or 4 shoe M2C 7075 clutch setup installed backwards would work VERY well, though I haven't personally tried one yet. - I will when I do my Alpha 56 powered 8ight-T this winter!
10-22-2007, 08:16 AM
#705
...On another note, has anyone ever experimented with a RCV .58? They look really interesting, the only things I wonder about is if it would hold up to doubling it's max RPM, and if that could even be accomplished without too much hassle. I'm really curious, because it has no valves to float!
http://www.rcvengines.com/rcv58cd.htm
http://www.rcvengines.com/rcv58cd.htm
10-22-2007, 08:58 AM
#706
...On another note, has anyone ever experimented with a RCV .58? They look really interesting, the only things I wonder about is if it would hold up to doubling it's max RPM, and if that could even be accomplished without too much hassle. I'm really curious, because it has no valves to float!
http://www.rcvengines.com/rcv58cd.htm
http://www.rcvengines.com/rcv58cd.htm
10-22-2007, 11:12 AM
#707
I also found this:
http://www.mecoa.com/hp/vt/25.htm
It seems at least 1 other manufacturer has tried to enter the 4 stroke r/c car market, although it looks like it's a 30 year old design.
http://www.mecoa.com/hp/vt/25.htm
It seems at least 1 other manufacturer has tried to enter the 4 stroke r/c car market, although it looks like it's a 30 year old design.
10-23-2007, 01:14 AM
#708
Registered User
10-29-2007, 10:33 AM
#709
WHAT A WEEKEND! The Thump R/C production side-intake head had a successful outing at this year's Dave Mapston Memorial in Gas Truck. Local fast guy Brandon Gummere ran it in his new GT2, qualified 3rd in the B, won by 3 laps, bumped to the A, and finished 4th after 40 minutes with the fastest gas truck drivers from all over the northwest. Check posts 330 - 336 in this thread: http://www.rctech.net/forum/showthread.php?t=175943
The B main was 15 drivers for 25 minutes, while the A was 15 drivers for 40 minutes.
Oh, and the engine he used is the same one I have been running for a year and a half. That's almost every club race last summer/fall, Canadian Winter Nats, 5 rounds of the Northwest Championship Tour, all this year's club races, and countless fuel bottles in the backyard and local tracks testing - all without ANY engine maintenance, not one drop of after-run oil, and blatant disregard for air filter maintenance. Durability testing at its finest!
The B main was 15 drivers for 25 minutes, while the A was 15 drivers for 40 minutes.
Oh, and the engine he used is the same one I have been running for a year and a half. That's almost every club race last summer/fall, Canadian Winter Nats, 5 rounds of the Northwest Championship Tour, all this year's club races, and countless fuel bottles in the backyard and local tracks testing - all without ANY engine maintenance, not one drop of after-run oil, and blatant disregard for air filter maintenance. Durability testing at its finest!
11-06-2007, 10:47 AM
#711
You mean THE side-intake head (singular)? 
It's getting there. I donated the prototype to my first customer because I promised I'd have it ready for him before that race. It was weird going to a race, having a thumper running, but instead of driving it, I was pitting for it! It WAS cool to see someone with skillz driving it though, because you could just see the potential that I've always known was there come alive on the track.
I do have the first batch of intake manifolds done, in the box, ready to rock ---- now I just need the first batch of port plugs to be made so I can assemble the heads, then have them machined, make instructions and packaging (just for the heads), then work on the rest of the GT2 kit. All the mill work I can have done without a whole lot of lead-time, but the lathe work is done at a local shop, so I get in line like everyone else.
It's getting there. I donated the prototype to my first customer because I promised I'd have it ready for him before that race. It was weird going to a race, having a thumper running, but instead of driving it, I was pitting for it! It WAS cool to see someone with skillz driving it though, because you could just see the potential that I've always known was there come alive on the track.
I do have the first batch of intake manifolds done, in the box, ready to rock ---- now I just need the first batch of port plugs to be made so I can assemble the heads, then have them machined, make instructions and packaging (just for the heads), then work on the rest of the GT2 kit. All the mill work I can have done without a whole lot of lead-time, but the lathe work is done at a local shop, so I get in line like everyone else.
11-06-2007, 11:48 AM
#712
Tech Addict
iTrader: (4)
I'm just looking for one side intake head DP, sorry for the confusion.
Sounded like you had a bunch of them stock piled over there. When you are ready to sell just heads, let us know, I think a few guys are looking for them currently.
Is the carb you're talking about by AE for the GT2 just the rotary carb for the AE .15? Sure would be nice not to have to run any fuel pumps or anything and you're right, alot cheaper too.
Thanks DP, Chad
Sounded like you had a bunch of them stock piled over there. When you are ready to sell just heads, let us know, I think a few guys are looking for them currently.
Is the carb you're talking about by AE for the GT2 just the rotary carb for the AE .15? Sure would be nice not to have to run any fuel pumps or anything and you're right, alot cheaper too.
Thanks DP, Chad
11-06-2007, 12:51 PM
#713
Yup, it's just the A/E .15 rotary carb that comes on the RTR GT2, and lots of other 1/10th scale RTR kits. It requires an adapter collar to use with my intake manifold, but works very well. It has a 10mm neck, whereas the current OS carbs all use 13mm necks and 1/8 size filter boots.
This is by design, so if a carb that works better comes along, it will fit the manifold without having to make a new one.
This is by design, so if a carb that works better comes along, it will fit the manifold without having to make a new one.
11-07-2007, 02:09 PM
#716
Tech Adept
DP how long of run time with the 52 four stroke on how many cc tank. thanks
11-07-2007, 02:14 PM
#717
Tech Adept
I should have also asked what percentage of nitro to.
11-07-2007, 02:20 PM
#718
Tech Adept
does anyone know if the O.S. fourstroke fan unit driven by the engine is still available, and if so were can it be purchased.
Last edited by laro; 11-07-2007 at 02:22 PM. Reason: spelling
11-08-2007, 08:04 AM
#719
.52 stuff
I ran the .52 in a Revo with a 175cc tank on Morgan's 30% low smoke heli fuel, and it would go 12 to 13 minutes.
Also, the fan is a Kyosho Nitro Blizzard cooling fan. You can download the Nitro Blizzard manual and lookup the part number. Kyoshoamerica's shop site shows it as "Item can be placed on backorder."
Also, the fan is a Kyosho Nitro Blizzard cooling fan. You can download the Nitro Blizzard manual and lookup the part number. Kyoshoamerica's shop site shows it as "Item can be placed on backorder."
11-08-2007, 09:27 AM
#720
Tech Adept
thanks for the info DP