Question about different nitro engines

[lexcom]

My friend just bough a Force .32 (5.2cc) engine to repace his old KE25 kyosho engine on his Neo ST race spec.

The result is great. But by this we started to argue about how different engines would behave on the car with stock transmission and gearing.

Some engines revs up to 50 000 rpm and some just stops at 30 000 rpm. But they can have aboute the same power. What would be the diffrerens on that car if the engine revs 50 000 instead of 30 000 if both has 3hp? It looks like the top speed should be the only diffrence on stock gearing?

I have orderd a HPI Trophy Truggy 4.6. The nitro star engine has on the paper 2,9hp and revs max 32 000 rpm. If I would like to buy a stronger and more powerful engine what should I buy?

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[2revo1maxx]

First of all, don't buy into the hp claims of any engine, they're grossly over-inflated numbers and typically about 2 times the actual output.
Secondly, a lower reving engine will tend to have more torque and should be able run a taller gear ratio. A higher reving engine is nice because it makes less torque and it will be easier to control wheelspin in some situations. They're also the best way to go on pretty much anything that does not have a 2-speed.
You just have to determine which is best for the type of vehicle it's going in. An engine that revs 50,000 rpm is also going to cost a pretty penny.

 

[lexcom]

Yes I understand that the manufacture exaggerates the figures a bit. But that figures they provide you with is the only thing you have.

So basically a engine that revs more has lower torque, that makes sence. So a engine with high torque should be more useful on heavy cars then.

If you would buy a new power engine to a 1/8 truggy what would you buy?

 

[MudSlinger33]

I have the same truck you just ordered and can say that the 4.6 engine, while not the best power plant out there, has no problem pushing around the truggy. It has good bottom end and decent speed for its size.

 

[2revo1maxx]

A good budget mill would be the Lrp series of engines. You can also check out Os, Picco, and Go engines.

 

[avelciario]

Go for LRP nitro engines.

 

[WinnersCircle]

I have raced 1/8 on-road for years and this class tends to run the engines that make their power at higher RPMs. Now I am running in the GT class and these engines are the off-road type that make their power at low RPMs.

After running both types of engines I can say I prefer the off-road type power band for road racing due to the instant torque off of the corners. This gets the car moving rapidly to the next corner.

On a 20 second lap the high rpm engine is in its element for 1 to 2 seconds while on the straight and the rest of the time i feel like I a waiting for the power to come in as the RPMs climb.

On the other hand, the off-road low rpm type engine will pull hard off of the turn. Granted it will lay down at the end of the straight compared to the high RPM type engine.

I said all that to say this - If you are running on a short to medium size track get the off-road style engine. If you are on a track with a lot of long straights or if you are in a parking lot doing wide open throttle long runs then get the on-road type engine.

The on-road type engine will cost more.

I am running a LRP 28 in my GT car and it is really strong off the turn and still gives very good top speed. It just needs to be geared properly for the track you are running on.

Lee

 

[lexcom]

This engine seems nice

http://www.lrp.cc/en/products/nitro...lrp-nitro-motor-zr32-spec2-pullstart/details/