Great job Buggyboy! That thing looks awesome. It's great to see more thumper lovers poping up!

I recently began a new project, OS-FS40S-C into a new X-ray XB8 buggy. I'll be using a werks racing offroad cyntax type clutch that I adapted. I just gotta make the engine mount and a new intake manifold. This thing is gonna be fun!! I spent some time on the dyno with the engine and it is putting out some serious power! Stay tuned!

Apex, I am working on designing some parts specifically for the four stroke conversion guys. I hope to have some stuff available in October. Sorry so long, but I have to fit it in with the other projects I'm working on. Let me know what are the most important things you guys need, and I will work on it.

Till next time...

BK

VERY interested in this project. That is exactly the next r/c vehicle I am thinking of "thumping"! Mostly because if its LOW center driveshafts... could probably lay the engine over far enough to have room for a carb under the body.

Also, if you're looking for more power than the 40C has, you can take the cam, valve springs, and spring seats and drop 'em in an FS-52. I have 2 gallons through mine and its holding up nicely.

Buggyboy,

Maybe I'll concider a YS 63 for the next project. With its supercharged design and integrated fuel pump, this engine might work really well. I'll just have to see how much rpm I can get out of it on the dyno. I think I will need to make my own gearing for the car though. Just a thought.

BK

Don't stress the fuel pump thing, I have it perfected now. You just hookup a short pressure line to a pulse type pump and vent the pressure line with a fuel line T (pointing down with a vent line connected) so the blow-by fuel and oil doesn't collect in the line or get in the pump. It ends up allowing the pump to supply the perfect amount of pressure for a 2 or 3 needle 2 stroke .21 race carb. Also, having an adjustable fuel pump allows very precise tuning of the mid-range mixture for super-crisp throttle response... Literally limited by how fast your throttle servo is.

Personally, I would shoot for maximum revs using a different cam and valve springs. The FS52 I modded has more than enough power to compete against big block 2 strokes, and it's easier to gear and clutch than it would be stock due to its ability to rev. So far, reliability is as good as the FS26-C.

a YS63 would be insane in a big MT like a Savage or the Genesis...
I say go for it

Guys, I just received a few savage ss kits. After the xray project is finished I think I might put a YS 63 into one of the savages. I will post photos and dyno results of both projects when they are completed. Stay tuned...


BK

MX, why not the YS63 into the XB8

T-bird,
The ys 63 is much heavier than the FS 40S-C and doesn't have the rev capability. Also the FS 40S-C was meant to be a buggy replacement engine. And also, I didn't even think about it until yesterday... We'll have to see how the FS 40S-C does. Maybe the YS will end up in the buggy... who knows.

Later

BK

...did you say you received a FEW Savage SS kits???
how many is a "few"? can i have one lol.

i just been thinking about new engine for my savvy and a mate sent me this thread as a link.
whats teh general idea on the fs 40 or the 52 with teh 40 valve springs
is it worth it over a 2 stroke they sound sick but is it worth the money?
if i got one i would drop a slide carby and new muffler on would it be a worth powerplant?

thnx

Well, I'm going to bust out the old FS-26C powered gas truck this weekend. The MT is out of commission while its chassis is being extended, and I have to race SOMETHING this weekend. I'm thinking I'll switch from the oscillating pump to the regulated pulse pump (Perry VP-30) for this weekend. It'll probably make more power and definately run smoother on our rough track since it's regulated.

The thought of EVEN MORE POWER in that gas truck is pretty cool, since it was regularly shearing axle pins before! I ended up switching from roll pins to solid pins to keep them from shearing.

Hey guys, i have been thinking of doing a four stroke project car for a couple of years now and the Revo video was very inspiring. How did the 52 compare to the stock motor and what made you go straight to the 52 instead of the 26? Also what engine mount did you use? New Era?

Thanx

Read through the thread where I posted the video over here, it has all the why and how. I used a bigger engine because I wanted something comparable to the big bore big block 2 stroke MT engines, and my FS-26C is already in use in my gas truck.

Oh... power-wise, it's insane! Think Crono .30, only there's no spool-up time, no bogging, and when the race director says "clear 'em out!" you just let it idle.

I'm pretty sure this is the project I want to take on. i'll make sure keepyou guys up to date on my progress.