Are Dyno's hard on the motor
Thread Starter
Teching In
Joined: Jun 2006
Posts: 2
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Are Dyno's hard on the motor I have been told that the chassis dyno is hard on the crank, rods, main bearings, etc. However DynoJet claims that their free-wheeling model puts 75% less stress on components. I have a new motor with 2000 miles on it and would like to put it on the chassis dyno to get an accurate bhp, but I am a little gun shy of damaging the motor. Any thoughts-suggestions-things to avoid would be very helpful.
TECH Enthusiast
Joined: Sep 2004
Posts: 564
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From: Omaha, NE
Chassis dynos save engines from being destroyed. A properly operated dyno is less harmful to an engine because many vitals can be monitored such as A/F ratio, fuel pressure, timing etc during testing. Eventually, many experimental tuners find there way to a dyno but often too late, after they have gone thru a few engines. A dyno that puts 75% less stress to an engine is not as affective at such testing as one that correctly simulates actual engine loads.
Free-revving is worse on an engine than going through the rpms with load. Like revving to 6500 through 1st is not as stressful as revving it up to 6500 in N.
Bottom line strap it on the dyno and let her rip, it'll be alright.....
Bottom line strap it on the dyno and let her rip, it'll be alright.....
Originally Posted by BriancWS6
Free-revving is worse on an engine than going through the rpms with load. Like revving to 6500 through 1st is not as stressful as revving it up to 6500 in N.
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Staging Lane
Joined: Nov 2006
Posts: 60
Likes: 0
From: Lacey, WA
I have been told that the chassis dyno is hard on the crank, rods, main bearings, etc. However DynoJet claims that their free-wheeling model puts 75% less stress on components. I have a new motor with 2000 miles on it and would like to put it on the chassis dyno to get an accurate bhp, but I am a little gun shy of damaging the motor. Any thoughts-suggestions-things to avoid would be very helpful.
Sure there's stress, and load, etc etc... but umm... thats what your engine is designed for...
Don't listen to all the fear mongering...
-Dan
a Dyno is DEFINATELY more stressful than running it on the street. The car is trying to roll some rollers while its strapped to the ground but the suspension is pressing down, so not only does it have to fight its own weight, but the pressure applied by the suspension aswell. AND, a dyno will never have the cooling that a 4th gear pull could ever have.
Staging Lane
Joined: Nov 2006
Posts: 60
Likes: 0
From: Lacey, WA
a Dyno is DEFINATELY more stressful than running it on the street. The car is trying to roll some rollers while its strapped to the ground but the suspension is pressing down, so not only does it have to fight its own weight, but the pressure applied by the suspension aswell. AND, a dyno will never have the cooling that a 4th gear pull could ever have.
As for the OP: Remember, Don't listen to all the "Fear Mongering" people babble on about stuff like it's the ultimate engine killer...
...It's a dyno pull... it's a load on an engine... Believe it or not, your engine is designed to work under loads, and a dyno pull is just another kind of load for your engine to handle.
If you don't want to put any stress on your engine. Don't EVER start your car. Because just running your engine is creating stress...
-Dan
a Dyno is DEFINATELY more stressful than running it on the street. The car is trying to roll some rollers while its strapped to the ground but the suspension is pressing down, so not only does it have to fight its own weight, but the pressure applied by the suspension aswell. AND, a dyno will never have the cooling that a 4th gear pull could ever have.
Well, maybe i just have crappy dyno operators, because I have hadd cars that ran well on the street and blew headgaskets on the dyno. One of which was my nitrous LS1 =[. Im going to say a dyno is harder on a car than on the street, due low airflow, even if the dyno shop has a fan. It simply cannot recreate the force of air coming through the radiator when the car is in motion.