Discussion
Hi
What is Monaro propshaft made from? steel or alluminium.
Also I believe that it is a two piece item. Most cars have a one piece, what is the advantage of two. (what is a harmonic imbalance? and how bad is it)
http://www.driveshaftshop.com/main_cat1.php (search under GTO)
I believe that Corvettes use an alluminium propshaft, or is this different circumstance as the Corvette uses a transaxle rather than a gearbox.
Many thanks
(I have just edited this as I typed driveshaft when I actually meant propshaft (between gearbox and diff))
What is Monaro propshaft made from? steel or alluminium.
Also I believe that it is a two piece item. Most cars have a one piece, what is the advantage of two. (what is a harmonic imbalance? and how bad is it)
http://www.driveshaftshop.com/main_cat1.php (search under GTO)
I believe that Corvettes use an alluminium propshaft, or is this different circumstance as the Corvette uses a transaxle rather than a gearbox.
Many thanks
(I have just edited this as I typed driveshaft when I actually meant propshaft (between gearbox and diff))
Edited by nike 5 on Friday 24th October 09:30
nike 5 said:
Hi
What is Monaro propshaft made from? steel or alluminium.
Also I believe that it is a two piece item. Most cars have a one piece, what is the advantage of two. (what is a harmonic imbalance? and how bad is it)
www.driveshaftshop.com/main_cat1.php (search under GTO)
I believe that Corvettes use an alluminium propshaft, or is this different circumstance as the Corvette uses a transaxle rather than a gearbox.
Many thanks
(I have just edited this as I typed driveshaft when I actually meant propshaft (between gearbox and diff))
What is Monaro propshaft made from? steel or alluminium.
Also I believe that it is a two piece item. Most cars have a one piece, what is the advantage of two. (what is a harmonic imbalance? and how bad is it)
www.driveshaftshop.com/main_cat1.php (search under GTO)
I believe that Corvettes use an alluminium propshaft, or is this different circumstance as the Corvette uses a transaxle rather than a gearbox.
Many thanks
(I have just edited this as I typed driveshaft when I actually meant propshaft (between gearbox and diff))
Edited by nike 5 on Friday 24th October 09:30
dont know if most cars have one piece all the RWD's ive worked on have had 2 piece props with a UJ in the middle, supported by a centre bearing cap. Maybe a weight issue so they can be supported half way along the shaft
Edited by racebreed1 on Friday 24th October 13:15
nike 5 said:
Hi
What is Monaro propshaft made from? steel or alluminium.
Also I believe that it is a two piece item. Most cars have a one piece, what is the advantage of two. (what is a harmonic imbalance? and how bad is it)
http://www.driveshaftshop.com/main_cat1.php (search under GTO)
I believe that Corvettes use an alluminium propshaft, or is this different circumstance as the Corvette uses a transaxle rather than a gearbox.
Many thanks
(I have just edited this as I typed driveshaft when I actually meant propshaft (between gearbox and diff))
most cars do not use a 1 piece.What is Monaro propshaft made from? steel or alluminium.
Also I believe that it is a two piece item. Most cars have a one piece, what is the advantage of two. (what is a harmonic imbalance? and how bad is it)
http://www.driveshaftshop.com/main_cat1.php (search under GTO)
I believe that Corvettes use an alluminium propshaft, or is this different circumstance as the Corvette uses a transaxle rather than a gearbox.
Many thanks
(I have just edited this as I typed driveshaft when I actually meant propshaft (between gearbox and diff))
2 piece can run smoother, less vibration, and turn faster for any given overall length. And in many cases...is essential.
Corvette uses a steel shaft, inside an Alu torque tube.
A 1 piece has the potential to be stronger.....but IMO, with too many sacrifices on a car like these.
It is steel. Looks much the same as my previous Omega apart from thicker rubber disks.
Took these pictures last year before removing to change the gearbox. On a MK1 Granada (2ltr Pinto)I owned previously the position of the centre bearing was critical to minimising vibration hence wanting to be sure I put the Monaro one back in the correct place. The Granny had all UJs. Later Grannies had 2 UJs and a doughnut at the front. The Omega and Monaro have just one UJ and doughnuts at both ends. I had previously thought the UJs worked in pairs and need to work though equal and opposite angles - eg the shaft centre lines are parallel just stepped down.
Took these pictures last year before removing to change the gearbox. On a MK1 Granada (2ltr Pinto)I owned previously the position of the centre bearing was critical to minimising vibration hence wanting to be sure I put the Monaro one back in the correct place. The Granny had all UJs. Later Grannies had 2 UJs and a doughnut at the front. The Omega and Monaro have just one UJ and doughnuts at both ends. I had previously thought the UJs worked in pairs and need to work though equal and opposite angles - eg the shaft centre lines are parallel just stepped down.
What I'd like to know is, has anyone on here shagged a prop shaft yet, I mean, someone who really gives it the gun or has quite a few hard passes on the strip?
I read of one guy in Australia who very nearly rectum as a result of the doughnuts shredding.
With all this talk of 600hp+ cars beiong built, surely the rest of the drivetrain becomes an issue?
I am thinking of a solid balanced aluminium prop for the strip next year. Mine is not a daily driver, someone else delivers the milk round here.
So I'm not that bothered about a little more noise.
I read of one guy in Australia who very nearly rectum as a result of the doughnuts shredding.
With all this talk of 600hp+ cars beiong built, surely the rest of the drivetrain becomes an issue?
I am thinking of a solid balanced aluminium prop for the strip next year. Mine is not a daily driver, someone else delivers the milk round here.
So I'm not that bothered about a little more noise.
MyM8V8 said:
What I'd like to know is, has anyone on here shagged a prop shaft yet, I mean, someone who really gives it the gun or has quite a few hard passes on the strip?
I read of one guy in Australia who very nearly rectum as a result of the doughnuts shredding.
With all this talk of 600hp+ cars beiong built, surely the rest of the drivetrain becomes an issue?
I am thinking of a solid balanced aluminium prop for the strip next year. Mine is not a daily driver, someone else delivers the milk round here.
So I'm not that bothered about a little more noise.
No propshafts are solid, they are all tubular.I read of one guy in Australia who very nearly rectum as a result of the doughnuts shredding.
With all this talk of 600hp+ cars beiong built, surely the rest of the drivetrain becomes an issue?
I am thinking of a solid balanced aluminium prop for the strip next year. Mine is not a daily driver, someone else delivers the milk round here.
So I'm not that bothered about a little more noise.
As stated....unless you want to severly limit top speed, a 1 piece shaft is a no go.
The only one that might have potential, is carbon fibre, but even that might be pushing it.
The shaft is simply too long in 1 piece, to spin the speeds you need to achieve any decent speeds safely.
Rubber doughnuts are designed so that even if they are destroyed, you will still have drive....until all the bolts etc break.
read my lips....
1 piece, forget it unless you want severe speed restrictions imposed.
Find out the critical speed of the shaft, and see if its capable of carrying you safely to your intended top speed.
More than likely, it wont, and may find yourself limited to circa 150/160mph...perhaps slightly more....good chance a lot less.
1 piece, forget it unless you want severe speed restrictions imposed.
Find out the critical speed of the shaft, and see if its capable of carrying you safely to your intended top speed.
More than likely, it wont, and may find yourself limited to circa 150/160mph...perhaps slightly more....good chance a lot less.
Stevieturbo.
If I am understanding you correctly
The product shown on http://www.bmrfabrication.com/GTO.htm
Prop shaft has a maximum RPM of 7,200
Through my T56 gearbox
4th gear = 1:1 therefore I can rev to 7,200 revs
5th gear = 0.82:1 therefore I can rev to 5,904 revs (7,200 x 0.82) which for me equates to 152mph
6th gear = 0.56:1 therefore I can rev to 4,032 revs (7,200 x 0.56) which for me equates to 151.8mph
speeds assume no aerodynamic loss.
I do not know what final drive ratios Monaros use, but you could work this out from http://westfield-world.com/gtc.html
If I am understanding you correctly
The product shown on http://www.bmrfabrication.com/GTO.htm
Prop shaft has a maximum RPM of 7,200
Through my T56 gearbox
4th gear = 1:1 therefore I can rev to 7,200 revs
5th gear = 0.82:1 therefore I can rev to 5,904 revs (7,200 x 0.82) which for me equates to 152mph
6th gear = 0.56:1 therefore I can rev to 4,032 revs (7,200 x 0.56) which for me equates to 151.8mph
speeds assume no aerodynamic loss.
I do not know what final drive ratios Monaros use, but you could work this out from http://westfield-world.com/gtc.html
nike 5 said:
Stevieturbo.
If I am understanding you correctly
The product shown on http://www.bmrfabrication.com/GTO.htm
Prop shaft has a maximum RPM of 7,200
Through my T56 gearbox
4th gear = 1:1 therefore I can rev to 7,200 revs
5th gear = 0.82:1 therefore I can rev to 5,904 revs (7,200 x 0.82) which for me equates to 152mph
6th gear = 0.56:1 therefore I can rev to 4,032 revs (7,200 x 0.56) which for me equates to 151.8mph
speeds assume no aerodynamic loss.
I do not know what final drive ratios Monaros use, but you could work this out from http://westfield-world.com/gtc.html
Monaro's mostly use a 3.45 rear....unless it has been swapped for differentIf I am understanding you correctly
The product shown on http://www.bmrfabrication.com/GTO.htm
Prop shaft has a maximum RPM of 7,200
Through my T56 gearbox
4th gear = 1:1 therefore I can rev to 7,200 revs
5th gear = 0.82:1 therefore I can rev to 5,904 revs (7,200 x 0.82) which for me equates to 152mph
6th gear = 0.56:1 therefore I can rev to 4,032 revs (7,200 x 0.56) which for me equates to 151.8mph
speeds assume no aerodynamic loss.
I do not know what final drive ratios Monaros use, but you could work this out from http://westfield-world.com/gtc.html
Aerodynamics dont come into it...shaft speed is the limitation. Your maths is correct though. If the critical speed is 7200rpm...I'd be staying 4-500rpm safe of that.
The vibrations that enter the car when you approach critical speed, are very very severe, and could result in shaft destruction, with rather nasty consequences.
Ive felt this for myself when I had a 1 piece....if only shaft suppliers were more vocal about such things when placing orders...and not 2 shafts later and serious vibrations later.
2 piece is the way to go. So far Ive spun mine safely to over 9000rpm...and it would be in similar overall length to a Monaro setup.
So back to Monaro...give or take a few mph.
3.45, with 255/40x18 tyres would result in a shaft limited speed of much less than 160mph.
easiest way is just to use 4th gear...as 4th gear is shaft speed, and plonk max engine rpm ( ie shaft speed ) into 4th and see what road speed it says.
Edited by stevieturbo on Sunday 26th October 03:11
MyM8V8 said:
Must be to do with shaft length and flexing then?
If you were not interested top speed, i.e 1/4 mile stuff a one piece would be better for higher loads?
Stevie, I assume you have normal uj's on it and not the doughnuts?
Search critical speed.If you were not interested top speed, i.e 1/4 mile stuff a one piece would be better for higher loads?
Stevie, I assume you have normal uj's on it and not the doughnuts?
Edited by MyM8V8 on Sunday 26th October 20:45
Just imagine spinning a flag pole, and think of the harmonics that could build, causing serioss vibrations. Same happens a prop.
Given a 2 piece can be made, I really cant see why anyoe in their right mind, would want the limitations imposed by a 1 piece shaft, unless it was a drag only....and SLOW drag only car.
Because at 160mph absolute maximum.....it'd be a pretty bad drag car.
Why not just run a 2 piece, thats smooth everywhere, and is strong.
No, I do not have any rubber in my driveline.
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