4 cycle engine?

[fierodough]

Hey guys! is there a 4 cycle engine out there for R/C cars? I've seen some at local hobby shops for planes, but none for R/C.

Second: Has anyone tried to engineer a fuel pump? I understand that as the tank gets empty, the pressure lowers and the engine leans out.

Thanks!
Eric

 

[Skipper]

I belive there are some, but man I would love to put on in my Maxx, No over heating, and less rebuilds do to lower RPM's. Also you could use a perry pump as a fuel pump I belive, but you have to make it suck the right amount of gas, I.E, Idleing less and WOT more.
Anyway does anyone know of a 4cyl engine that fits into a maxx?

 

[fierodough]

Not a 4 cyl engine. (that would be way to big) but a 2 cyl at 4 cycle.

as for fuel pressure. just add a regulator that would auto adjust with exaust pressure. or vacuum if the carb can produce enough. just like a car.

 

[SilentHunterKellen]

Thats a good idea but a FourCycle engine wouldnt produce enough RPMS to get a good top speed-so keep dreaming.
Last Note: Getting a 4cylinder would be soo hard...not a good idea.

 

[fierodough]

not so, 2 cyl, way more torque. use a smalelr gear. if you don't change the tranny, it's like hooking up a big block shevy to a honda tranny.. Yikes!

 

[SilentHunterKellen]

Originally posted by fierodough
hooking up a big block shevy to a honda tranny

The question is...why?

 

[fierodough]

Originally posted by SilentHunterKellen


The question is...why?

Wel I'm not sure i get your question. from the quote above, I was demonstrating the importance of getting the propper tranny (gearing) for that engine or nothing will work.

or, the other way I took it, why a 4 cycle engine? Simple! low maintnance, more power, SUPER quiet and more mods. You can then start looking into valves, actualy take advantage of a real supercharger, maybe even run real oil? straigh gas? (well that's all really out there right now)

Just opening the door to more options. You have to admit, our engines are pretty premitive tech. lots of improvements have been done, but moving to a better base opens new doors.

Just my $.02, must be a reason R/C planes use them.

Cheers!
Eric

 

[Error401]

4 stroke, single cylinder. There are some OS 4 strokes on the market, and 4 strokes do have more low end torque than 2 strokes, but less RPM. All the aircraft 4 strokes I have had all state a max RPM of 10K in order to prevent valve float, and you adjust this by putting the right propeller (load) on to attain this RPM. But, the power to size ratio for 2 strokes to 4 strokes is about 2/3. So, generally a .60 4 stroke puts out about the same power (thrust for airplanes) as a .40 2 stroke, but at a lower RPM. YS makes supercharged 4 strokes that are amazing, but they are not designed for cars.

As for primative technology, ha. My Hyper 8 puts out a rated 2.5 HP at ~30K, my old YS .91 AC 4 stroke put out that much power, but is nearly 5 times the weight and displacement and only turns 10K when set up properly. 2 Strokes have always, and will always rule the power to weight category. Sorry, but it's a fact of life. I would love to shoe horn a YS AC into my savage, but I don't think it's possible.

Then there's the gearing issue. First, the tranny would have to be sound enough to handle the torque, then you'd have to find a way to mount the flywheel and clutch to it, and an engine mount. Then you'd need to find the biggest clutch bell made, and the smallest spur and get everything lined up right. Also the clutch springs would need to be alot lighter than the ones for 2 strokes (due to lower RPM). I'm not saying it's impossable, but it'd be alot of work.

Peace,
Whitt...

 

[fierodough]

Thanks for the input error401.

Hope you didn't take offecive of my previosu statement of the 2 stroke being primitive, it's just that it's a very simple design with lettle to no modifications that can really be done to the engine itself. because of the way they are designed, they can't handle boost. (being a GM fan, i need to go wash my mouth with soap now. )

I'm just picturing all that can be done to those sweet engines! but a whole new car need to be designed.. we can probably never fit it into an existing model. Not without serious modifications as you stated.

here is a pic to get our mouths watering.. I know.. it's a honda.. but it's the best i can come up with right now!

Now immagine that sitting behind a good reliable tranny, a turbo or a supercharger, an actual spark ignition!

It's just my own personal I wish list i guess..

cheers!
Eric

Woohoo! I'm getting somewhere!

check this link out! a 4stroke for r/c cars!

http://rcvehicles.about.com/library/preview/blpre_012102a.htm

cheers!
Eric

 

[Error401]

No offense taken. There was a guy I used to fly pattern with, Mike McCormic (I think that's the right spelling). This guy did serious mods to his YS 1.20 engines. He was getting so much power from one that the con rod snapped from the torque. Valve jobs, timing changes, air chamber mods, he was a wizard with a YS.

But there is alot you can do to a 2 stroke. Port jobs for the sleeve and crank, the Hyper 8 has a turbo fan inside the case, changing the timings on the crank and the ports, as well as exhaust mods (pipe designs mostly).

I love a good 4 stroke, don't get me wrong, but in the small cars we run, they just aren't the right tool for the job. This brings me to another point, look into 1/5 and 1/6th scale r/c cars sometime. These things have trick gas engines and are huge. I saw one in Va Beach that made me drool. Here are a few links to some really big r/c cars:

http://www.fg-america.com/site/lv5_products/f1comp.htm
http://community-2.webtv.net/hotmail.com/gbf1/gbf1/page2.html
http://www.bergonzoni.it/prodotti/1a5/Off-Road/domination_start/eng.htm

THere are a tomn of others and some of these cars have 4 wheel disk brakes, and some other really trick stuff. But it all comes with a heafty price.

 

[Skipper]

But man, could you imagine the power behind a 4 stroke in a Maxx or Savage, With those Low rpms thats what generates the torque, more dirt throwing thrust. But I dont know how the stock trannys would take it, maby if you stripped them down and replaced all the gears with metal gears, and added some trans fluid, just to keep them cool, possibly stronger diffs, and drive shafts, but in the end if all is succesful. you have one Mean dirt eating machine!

Heres a cool looking 2stroke, wonder how this would run???
Anyone ever try this brand?

http://www.bergonzoni.it/prodotti/1a8/motori/page/off_eng.htm

 

[metallicamaxx]

i have been runnig a .40 o.s. 4 stroke in my tmaxx for about a year and the tranny has held up fine. it has insane torque but it only tops out at about 25 mph with a 22 tooth clutch bell and a 64 tooth spur gear. it sounds like a harly and always draws a crowd at the track when i start i up.

 

[Spells_pt]

Could it take more?

metallicamaxx:

I've been reviewing a 4 stroke setup.

Could you Gear it even more?
Does the Motor have the Torque for more gearing?

From this Post:
http://www.wildhobbies.com/forum/topic.asp?TOPIC_ID=4042
it looks like you can go as low as 56T Spur.

Correction,... I did some Google-ing and found this.
http://www.strobe-rc.com/Module_1_slipper.htm

That would help your speed a bit, maybe pasted the 30mph mark.

Also, Does anyone know if NEW ERA has a website?..NM www.neweramodels.com (didn't show in Google??)