Anyone have a propshaft dyno ?
 

Particularly in the Chicago area but also interested in info of anyone running one. What type, cost, etc. I'm bouncing around an idea to open a dyno shop. Chassis dynos for cars and bikes, an engine dyno for engines and adaptability to propshafts. Any info or ideas appreciated. I would povide dyno's at an hourly rate and the customer would do his own tuning.

My buddy has a prop shaft dyno. It is not the one the Land and Sea makes. It more accuratly measures preasure at different RPM's. We use it more for testing under load then anything els. I think that he paid 500 bucks for it or something like that. The ones similiar to his that I have seen for sale have all been in the 1000-1500 range.

Jon

I had somthing more like this in mind http://www.superflow.com/

Ummm ya just like it..... NOT :D :D That is interesting for sure. How much does that thing cost?

Jon

The motorcycle chasis dyno's come in at 12-15 thousand depending on options. Not sure on the engine dyno but I may have a line on a used one.

I'm really suprised nobody else has piped up. This may be a better idea than I thought. I better erase this thread before somebody else sets one up. :)

Can someone explain to me how a "prop shaft" dyno works and or differs from a conventional
dyno.

THX
Sam

[ 02-08-2002: Message edited by: Sammy ]

You just hook up to the dyno using an adapter similar to a drive shaft that is connected to your propshaft. This could be done using an engine dyno. A chassis dyno, on the other hand, measures hp at the rear wheels by placing the vehicle on the machine with the rear wheels (or wheel for motorcycles) on a large drum. Both dynos measure power by monitoring the force applied to the drum or drive shaft, and engine rpm. Some dynoes use water presure, others use a heavy drum, while others use elecrit current.

Thanks Chris, if anyone knows of any shops that offer this service in the Detroit area let me know. One other question, are the prop shaft dyno's relatively accurate.

THX
Sam

You will have some loss of power resulteing from the drive. For instance, a motorcycle losses about 12% horsepower in the drivetrain (clutch, trans, chain )measuring hp at the rear wheel VS measuring hp at the carnkshaft. The dyno's are very accurate although you will get different readings in actual hp depending on variables such as weather. These dynos will also give you a corrected hp number that takes weather into concideration.

Still suprised at the lack of response to this thread.

I am working on a shaft dyno that will attach to a stellings extension box. It will have a digital display on the dash and read real time TQ and HP while you drive. What do you think of this?

cobra marty;
That is a good idea, how do you plan to measure torque? The land and sea device?

A torque strain measuring device similar to but better than L+S will attach to drive shaft yoke. Will have the real time digital display and analog output for data logging capability.

I like the idea and would be interested in knowing how it will work. How will you compensate for different props, water, and such. These variables would seem to play a big role in torque measured.

Check out www.land-and-sea.com on board dyno. Good explaination on how it works. Basically measures the twist of a shaft.

One last bump then I give up.:confused:

Re: Anyone have a propshaft dyno ?
 

Bringing this thread back from the dead. Would like to know if anyone has a prop shaft dyno in the upper midwest.

Re: Anyone have a propshaft dyno ?
 

Audiofin. What brand of dyno is the one that your buddy has?

Re: Anyone have a propshaft dyno ?
 

Riggs Marine in Omro Wisconson has one..

920-872-2728 ask for Mel


Doug

Re: Anyone have a propshaft dyno ?
 

RC OLSEN Marine in Omaha Nebraska has one :D

Re: Anyone have a propshaft dyno ?
 

We have one at CMI. Used for quick muffler backpressure tests and some development work. Easier and sometimes more accurate than using the test boats.

Re: Anyone have a propshaft dyno ?
 

Great. Thank you guys.

Re: Anyone have a propshaft dyno ?
 

Not to beat on a resolved issue, but I've always liked the real world dynos that measure actual to the ground or water power with all losses you have included. Really tells you what you have to work with. Crank dyno's are great for posting some big numbers but you can't get that at the wheels/propeller and have to calculate wheel/prop power by factoring in losses that may vary by one or two points depending upon your specific equipment and its condition. Are they exact? No, but for giving reference numbers for before and after should really help dialing in props.

Re: Anyone have a propshaft dyno ?
 

Do you have a stellings ext. box? or staggered engines?

Re: Anyone have a propshaft dyno ?
 

I have 2 of these and they work well, I bought one new for about 3k and one used for 1k.
http://www.internationaldyno.com/

Re: Anyone have a propshaft dyno ?
 

I have one of those. Works great for diagnosing problems that only happen under load. I think that model is only good up to 260 hp