Engine RPMs (Tach)

[Zen]

Hello All. I am new to 1/5 RC cars. I use to fly RC Planes and it was easy to determine the RPMs the engine is putting out. Just hold a tachometer up to prop and SHAZAM, RPMs. However, with cars, there is no easy way, or is there? I would like to tach the RPMs for my High speed, Low speed, and Idle for my car so that I can get maximum performance and preserve the life of the engine. Or am I just over thinking things?


Thanks.


The Zen has pondered.

 

[RampageHopUps]

Alot of engine builders will do this when tuning and breaking in an engine. I never see a regular guy tach'ng his engine while bashing or even racing.

Most of them use an engine tach with the highest RPM saved in memory.

 

[Zen]

Thanks for the response. just curiuos, engine manuals say don't let the motor go above 5k rpms for the first 8 hours of break-in, so how does a noob like me determine 5k? Last noob question, if the clutch is an 8k clutch, wouldn't exceeding that number damage the clutch?

Noob the Zen is.

 

[designed2survive]

Thanks for the response. just curiuos, engine manuals say don't let the motor go above 5k rpms for the first 8 hours of break-in, so how does a noob like me determine 5k? Last noob question, if the clutch is an 8k clutch, wouldn't exceeding that number damage the clutch?Noob the Zen is.

Nope. Disregard that "do not let the engine go above 5k rpms". As you found out if the clutch grabs at around 7500rpm you already exceeding that 5k recommendation. You can exceed that during break in as long as you are following a good break in procedure. Google "OBR break in" to give yourself an idea.

 

[RampageHopUps]

Yeah, the manual is useless.

The clutch engages at 8K, so they are asking you to idle it for a few tanks. Thats not good.

Just run it around the yard for a few tanks, and vary the throttle. Don;t do high speed extended runs, until around the 5th tank.

Someone will post the OBR tuning video I'm sure.

 

[phreerider]

Hello All. I am new to 1/5 RC cars. I use to fly RC Planes and it was easy to determine the RPMs the engine is putting out. Just hold a tachometer up to prop and SHAZAM, RPMs. However, with cars, there is no easy way, or is there? I would like to tach the RPMs for my High speed, Low speed, and Idle for my car so that I can get maximum performance and preserve the life of the engine. Or am I just over thinking things? Thanks.

The Zen has pondered.

sometimes the senses provide insight to the devices offering.

-the slow squeeze pull on the pullstart to FEEL when fuel load is present at TDC

-the SOUND of idle tune, speedy smooth nicely even, peak tune screaming fever pitch...you'll know when she hits the hi notes !

-the SMELL of rich fuel and SIGHT of a wet plug or spark

device will let Zen know

-

 

[Ice_2k]

Engine RPMs (Tach)

The clutch engages at 8K, so they are asking you to idle it for a few tanks. Thats not good.

isn't the stock clutch a 6k?

@Zen All telemetry-capable radio systems offer RPM sensors.

 

[Jonny5]

If you have an android phone got to the play store and search acoustic tachometer. Most of them work pretty well. Keep in mind a 2 stroke fires once per Rev so you will have to multiple the rpm by 2. Unless it has a setting to select 2 or 4 stroke

 

[rcgasser]

 

[Phill]

If you have an android phone got to the play store and search acoustic tachometer. Most of them work pretty well. Keep in mind a 2 stroke fires once per Rev so you will have to multiple the rpm by 2. Unless it has a setting to select 2 or 4 stroke

Thanks

Got the RPM Gauge on Android

Lets you pick 2 or 4 stroke and number of cylinders as well as upper and lower limits

Counted by Zen will revs be

 

[Zen]

Meter of Tach the Zen has evaluated. Hummm, maybe device the Zen is looking for indeed. View video you will,

Thanks to all for input.

The Zen is will soon no longer be a Padawan.

 

[Ildy666]

I have the same one on my race quad works great...