Can I........
 

A few questions:

1. Can i run the car w/o an exaust? or at least with one that i have made myself?
I was thinking not because it needs to be able to create pressureto push the fuel through.

2. Use any other sort of motor in the car? ie airplane engine?
I ask this because the aircraft engines seem to be HEAPS cheaper. making a mount might be tricky.

Thanks

you could do both... but without a exhaust you will lose alot of power
the exhaust is there to pressurise the fuel tank and to give maximum performance from the engine

An airplane engine wouldnt go very good either.... if you look at the difference in RPM ranges between a RC car engine a RC plane engine you will see the the car engine tops out usualy at around 28,000 + rpm
the plane engines usualy only go to about 17 000rpm

If you run without an exhaust two things will happen. One your engine will be really loud and the second more important point is that your engine will get really really hot. Even with a small crack in the header i've toasted motors, so without one completely it is gauranteed to fry.

I remember at autosalon 2002... the 1/8th buggy's exhaust came off and it was SO LOUD!!!! also got rather hot

Re: Can I........
 

YES you can run without exhaust.

But you & your family & your neighbours will hate you for it, it'll be very loud. Expect the cops to be called.

Loss of back pressure will not stop your engine. A good engine with good compression will create enough vacumm in its crankcase+carb to draw enough fuel in to keep running. But because now the fuel is less, it'll run very LEAN... = HOTTER. This lean running will overheat & kill your engine.


However also the "exhaust" in a 2-stroke engine is part of a "Tuned Pipe System", which is designed to increase the power of the engine by making through-breathing more efficient. Remove it and if the system was any good, there'll be huge loss of power.

2-strokes respond to Tuned Pipes much better than 4-stroke engines. That's why 1:1 cars don't bother with it (don't fool yourselves, riceboys!).

Nothing against designing your own Tuned Pipe, many ppl do. If you want to its best to talk to some of the offroad 1:1 bikies who race 2-strokes, they'll know everything about Tuned Pipes.


Again, nothing stopping you. Your car, your money.

Unless you're racing, then there'll be rules as to what max size engine you can run, in which class.

In both cars and planes, there are cheap and there are expensive engines. The big-name-brands usually aren't cheap.

Don't forget though:-
1) aircraft engines are designed to run consistantly & steadily at every possible posible throttle opening, not just idle/max like a car engine...
2) think big propellor pulling air, flying fast thru the air... then think about the cooling requirements when you stick the same engine under a plastic shell doing a quarter of the speed.

Remember too that expensive RC car race engines are optimised for their specific usage. A plane engine say "60" with twice the capacity isn't likely to give even the same power as a top 3.5cc "21" engine.

Bigger plane engines also have thicker crankshafts, so you'll have to engineer your own fixtures and clutch etc etc.



That said... if you're not into racing, do have a look at airplane FOUR-stroke engines. I think they're real cool, they run at a lower pitch than 2-stroke screamers and they give out lots of torque. And you don't even need a fancy exhaust system to optimise their output (see above!), just any old metal tubing will do.

So far I think only Kyosho has a 4-stroke SuperTen car, using a OS 46 engine.

Why would you bother with the change of engine as stated above the nitro car engines are alot faster than plane engines, why dont you just get a .21 that will fly...

When you take off the exhaust you lose all the tuning of the engine, i have found from karting that you hill have all top end power and the car will probably not even take off. Plus the noise... OH GOD THE NOISE!!!

Just my two cents

Duuurge :flaming: