You think you can price it around $250?
I Think that is reasonable price....

Re: OS FS-26S-C VerII availability...
 

I doubt that this engine will be slow. With a little modifying this new 4 stroke version will be a lot faster than a 2 stroke. I would only pay $150 for when I have the money. In japan this engine is the option package for the Kyosho V one RRR.

I doubt they would sell any since current rules only allow 2-stroke engines. If you were to get it as fast as current JP's, Rex's and Sirio's, you would hold an unfair advantage because of fuel consumption.

I disagree, I think they should be pretty close performance wise. Yes the four stroke might get slightly better miliage but they also will be a bit heavier than the two strokes. And if they do get slightly better fuel miliage that may be the reason for some drivers to change. The four strokes will always have some drawbacks compared to two strokes, like engine rpm.

Are you completly apposed to alowing four strokes to compete in 1/10 touring classes? If so is fuel consumption the only reason?

BK

I like the idea..... four strokers sound cool and if they can be made competive I would run one. If too many people whine they could always have a "4 stroke" class:nod:

No, I'm not opposed to four strokes. I'm just offering a view from ROAR's perspective. Change is good but very hard. As a matter of fact, I'm planning to get the four stroke conversion for my Kyosho.

i'm sure they sound lots quieter, and quieter is always better for tracks maintaining presense and new tracks opening in better places. It appears EFRA is always doing things to get them quieter, so Its possible that they may be open to 4 stroke developement.

Also 2 stroke gas engines will be illegal in a few years, who knows if they start to look at the hobby industry.

As far as gearing goes, its possible to change internal drive ratios on belt cars with diff pulley sets.

Makes want to put my OS 40 4stroke in a 1/8 on road! Wonder if I could get it geared tall enough?

id go a OS 52 4 stroke....that thing would be sweet

Latest developments
 

Hello all, I just thought I'd report my latest findings with this little engine. I haven't had much time lately to mess with this engine lately, but today I was able to make a few runs. Basicly I just made a few base line runs and then tried a new glow plug with a different temp range. I have included a copy of the latest dyno run.

The green run is the engine with the same modified parts as before. (Header, megaphone, 6mm 2 needle carb, intake manifold for new carb, and ball bearings on the camshaft instesd of brass bushings).

The blue run is the latest development with RE glow plug instead of type F. (The RE glow plug is std for OS Wankle or Rotary engine. It has a slightly cooler glow temp).

The increase wasn't huge but I think it was signficant.
Peak HP .64 --> .67
Peak TQ .18 --> .19
Peak rpm stayed the same.

Note: torque really picked up substancially all the way up the front side of the curve.

More to come! I am in the middle of designing the CNC head so it will be interesting to see what difference that will make. I am going to include Ti valves and Beryllium bronze valve seats with the new head. Also I have several new exhaust ideas to try!

Jamie; I wouldn't mess with the .52, it is not designed to rev like the FS-26S-C and FS-40S-C. I think the most rpm you would see out of the FS .52 would be around 13,000 VS 27,000 with the S-C versions.

Are you going to try putting that motor in the rules would be allowable if you just talk to ROAR. Are you a ROAR member? If so you can make your posts on rc-racing.com conferences and go to ROAR conference. Now is the time because the ROAR excom is meeting early october.

I think it would be interesting to find a equivalent for 1/8th scale cars, just need to work with the manufacturer on a different pulley set for gearing lower internal ratio. Is there an equivalent motor available?

WOW, those performance figures rival an OS .12 CV-R!!! (.66hp)

Man i am so loving the 4 stroke development....who knows whats next....



Dude, howabout an RB innovations supercharger?? One of them has got to make a difference in a 4 stroke motor....

good one mr shirlock, if you read what he said about his dyno is that it reads ITS own values, which are more realistic then 1.6hp .12's The most powerfull race motor that he has tested on his dyno has pushes .78hp. That menas that .67 hp out of a 4-stroke with insane torque is very close, considering the stock motor puts out .38 on his dyno.

WTF?? , an OS .12 is "quoted at 1.0hp, but actually puts out .66, which is the same topend that the OS 4 stroke has....

you dont understand, the dyno that RCCA uses and the one that MX wrench build are two different machines. The .66 number that you probably got from RCCA or RC Nitro, is not in any way shape or form compariable to MX's dyno. On his it probably would only pull .45hp at best.

Its apples to oranges. His dyno uses existing software from go-kart dyno's (I think thats where its from). The other mag's dyno has custom made sotware, that could calculate hp differently or have a bug, or just be pushed numbers.

I apologise if your getting the .66 number from his dyno, and Im in error, but I have yet to see him post any dyno numbers from a CVR.