from USA. weight 5.5kg. one piece
What do you think about it?
Photo:
http://photofile.ru/users/87255/115250932/

 

i'd personally be concerned about its strength

 

I asked them about item at least 750bhp(750Hm), if you need more, just ask them. also they can create carbon propshaft for less weight and more bhp. If you have interests http://www.driveshaftshop.com/

 

That will twist up like a stick of liquorice

The tube looks too thin, it looks like 2.5" 3" at the most and its a long shaft.

The long shaft needs to go up on tube size to give stability and the advantage of going up on tube size is you can run bigger and stronger joints

I suspect this will put a lot more vibration into the car than the original two piece and I suspect it will start to come apart at high revs.

I can do a calculation for you if you like, just give me the tube diameter and the length between the UJ centres


We've just quoted for a shaft for a Cossie powered MkII Escort and thats 1370mm from diff flange to gearbox flange and that had to be on a 3" swaging out to a 3.5" tube to get the critical speed up out of the potential rev range of the car.

 

diameter of the tube is 80mm. length between the UJ centres about 127mm. Also my mate from Moscow has installed the same cardan before, he was happy with it, he sad that vibrations was less then original one. You can see here his pics and compare it with original: http://photofile.ru/users/cosworth/2895492/?page=2

PS I have not another choise - I have not original cardan. First my cosie was 4wd. I decided to make 2wd, swaped gearbox to T5 but without cardan. I cuted original cardan from Pinto Sierra engine(type N(9) gearbox), but it put a lot of vibrations into the car(it was balanced but has small UJ)

Don't forget, the weight of original is more then 10kg, this one is 5kg! I think larger original piece also has more weight then 5kg.This is the reason why vibrations will be less imo. Anyway this evening I will know exactly, now my mechanics intalling it.

 

Why?

Whats 5kg gonna save you?

 

5kg static weight is 15kg when rotating

I'd be concerned that the supplier quoted it's strength in horsepower?

The force thats going to be applied to it is torque and only torque. Havig said that I know of a few cars that have been developed with a large diameter hollow alu propshaft, I think it was a Porshce engineer who initially perfected it in the early eighties, then came over to work for Ford on the RS1700t

However not knowing any of the dimensions etc who's to say what will work and what wont!

 

I have run an aluminium prop on my car, several times with no issue, that said, its spiral wound rather than straight tube.....

 

Less weight will turn under the car - less vibrations into the car IMO in case of imbalance.
I bought it not for saving 5kg. I just want to get good propshaft without vibrations. In my country is unreal to find original one, and my old one custom made with craped UJ. The price for used cardan from UK with shipping to Ukraine is the same with this perfomanced new one(with shipping form USA). Price with shipping was 600$.

 

We dont know what inside of my new propshaft, it is possible its not just tube inside. I believe to experience of DriveshaftshopMans ))))

 

Some of the big Drag cars use aluminium Propshafts, Making around 1500hp and 60fts of 1.2s with out trouble.

Im sure it would be fine.

 

After you install this please come back here and let everyone know how much smoother your car is. As far as strenght goes, you're not making anywhere near the power needed to damage this. I've used these shafts on several Mustangs over the years with no trouble at all, install and forget it.

 

Already installed it. It's OK, no any vibrations at all. Now I dont know exactly why and what, but my ass fill better acceleration, better response of gears shifting.

 

I really don't see why everyone is saying it'll be an issue. There are plenty of alu shafts kicking about.

Your increase in acceleration is most likely as you'll be loosing less power to the driveline with it being significantly lighter, thus having lower inertia.

Shafts transmit power, and hence their rating is in power IIRC. This will most likely be stated at a speed and hence you can work out what torque is.

JAmes.

 

Shafts transmit torque.

 

Some people ehh?

http://en.wikipedia.org/wiki/Shaft

about 8 lines down, could you read that out to me?

Thank you
JAmes.

 

why would alu vibrate less than steel?

 

Sure you don't mean 10 lines down??

 

it's pointless you arguing about whether they transmit torque or power as they are the same thing to the shaft (power = torque x rotational speed). and whether the shaft is rated in terms of torque or power @ x rpm is the same thing, but one thing is sure and that is that it will be too high torque that damages it.

 

Or too high power of course as they're the same thing to the shaft.

 

only if it's too high power at a certain rpm it could cope with an infinitely high power if it was at infinitely high rpm and hence torque is practically zero*

*although the shaft would break with extremely high rpm, but from a different failure mechanism, and the engine or gearbox would probably fail first

 

Very good, however its 8 indented lines down and they are the lines that make the list. So no, i dont mean 10 lines down.

JAmes.

 

I know where you are coming from, but from a system view its power they transmit.

JAmes.

 

agreed

 

I think you may have missed what I was getting at.

 

torque is applied to the shaft but it transmits the power.

 

I followed your generalised link and it pointed to the page below


Read the first line http://en.wikipedia.org/wiki/Driveshaft Hoisted by your own petard

I'd love to know how knowing something is rated to 100 horsepower is useful.......i could apply 100 horsepower to something by hitting it with my knob repeatedly for ten years. Or in 4 seconds by mashing it with a huge press press.

An engineer knows a rotating shaft transmits torque. A gearbox converts torque. The force applied to the shaft is lbft/Nm

That is all.

 

if you mashed it with a huge press you would not be transmitting either power or torque through it, you would be applying compressive forces to the item, completely different!

a gearbox and diff is indeed a torque covertor but a shaft TRANSMITTS POWER ACROSS IT by experianceing a TORQUE APPLIED TO IT!

 

I said repeatedly mashing with a press for 4 seconds ( up down up down etc )
Power = Work Done/Time

IMO a propshaft transmits the force applied to it....torque in = torque out. And it's torque that would break it.

Ask any engineer/tuner on here whether they rate gearboxes or driveshafts in terms of BHP or lbft.

Thats all i'm saying. I dont care what Wikipedia says ( altho it does say torque ) I'm talking about how a proper engineer would discuss it.

 

Anyone care anymore though?
Has been established it's more than up to the job.

 

Your first post on here was to insult me ( when i'm right ) and your second one is pointless too.

Are you peeved about something?

 

First one was a joke, second is relevant as thread is about what we think of the shaft, I said it's more than up to the job.
I leave the insulting to you, as it's your main purpose of being here it seems.

 

"mechanical component for transmitting torque and rotation"

Torque and rotation = power!

I am a proper engineer. I know what a gearbox does.

You would have done work ON the shaft, you would not have put power in to it, you would have spent power yourself. power is the rate at which energy is used, to use that high school technique of work done is a bit crude.

JAmes.

 

Great Post I dont need to say anymore. Just keep talking round in circles

 

wow, lets just say your all really really clever and get back to the thoughts on the actual product.

 

I posted them in my first post......

 

i am a qualified engineer specialised in performance cars mate

and its still compressive forces acting on it in a cyclic pattern not power or torque even if you mash it repeatedly.

you could rate them in either power or torque as they can be converted between the 2 using some simple equations.

 

I was thinking, I'll ask about at work and see if there is an industry standard test for automotive shafts. There might be a reason to state it in power as they are always perfromed to ISO-blahblah which always tests at a fixed RPM. I'd be interested to know now

JAmes.

 

Good for you. You'll understand what I mean then I hope. If I went to buy a custom gearbox, driveshaft or propshaft etc and the company quoted it's strength in power, i'd simly walk away and spend my cash elsewhere unless like our friend the thread starter I couldnt get it anywhere else.

 

As I remember manufacturer asked me about max BHP and max RPM of my car. I sad 750bhp(liberal ) and 7500rpm