Dyno Testing and Horsepower Output

I'm assuming you mean the dyno only reads hp at the tires?
85% of flywheel horse power. 465= 395hp at the back tires

 

Hook it to a loaded trailer. Leave the landing gear down. Pour bleach on tractor tires.


Make a Contolled burnout.


Crank landing gear up and approach on Ramp.


Drop 1st like you’re daddy caught you talking in church .

Get 2nd like you want to run out of the room

Search for 3 rd like you forgot where the closet was

Ahh 4th breath

Enough breathing into 5th. Run with it. 6 th is right around the corner

Here we go Breath 7thnnnnnnn

 

I was taught with a 425 engine long ago by a dyno man using simple words. He taught me that hotel power (Alternator, fan etc) steals a few horsepower. Transmission buys a little more. Then the rears and shaft and wheels etc soak up some more horsies. By the time the dyno feels the remaining horsies running on it you probably have lost about 115 or so of them. At cruise and put the foot down you go from base power to maintain say 200 hp to hold 55 and now you want to speed up. You have that 100 or so horses to add to the fight and get speeding up on flat ground. Only now you are fighting the outside air resistance and ground incline etc. That will soak up some more.

Whatever horses you have all out on that dyno should be better than 70% of what the stamp on the engine output in horsies say. Anything less you probably have a tired engine, or some other problem like no greasing etc. A form of arthritis in bad bearings parts or whatever.

I used up everything i know about this typing this post I hope it helps.

 

You do not need a meter to be able to say this blow by is way out of line under load. I would ask about looking at that.

 

What do you mean you don't need a meter?

To the op...

A dyno measures the hp at the wheels, it is calculated to figure out what the horse power is at the flywheel. It should be at least 75% of the rather hp, which is good for a high mileage engine.

Blowby is measured at a full load (which the dyno puts on the engine) and is measured in inches of water. This is as important as the hp rating.

All the ancillary power drain is meaningless for general purposes, mainly because the dyno fits that all in.

If you are getting a dyno, and they can't do a blowby or give you the full results, take it somewhere that can, a lot of dealers have bought cheap chassis dyno and charge the same price as one who have good ones and can measure more than just hp and blowby like fueling under a load and general performance.

 

Even saw a You Tube of someone using clear plastic hose with water in it making marks on the hose. If all you get is HP output that is a problem to me.
Ridgeline: Maybe I said that wrong but to me that is just as important as HP. Thanks for the additional information.