25 replies to this topic

[jameswildcooper]

what are the actual differences between them? i know the straight cuts will whine but what else?

[minipip]

less of a power loss in the gearbox with S/C

[Jimmyarm]

As mini pip says, you loose less power, and as you say, you gain more noise.

They are not 'stronger' than helical gears as some may suggest, but they do cut out on the side loading that occurs with helical gears (this is also the reason that they lose less power, as more is transferred to rotating force).

[taffy1967]

I don't think they have any synchromesh on any gears either?

[The Matt]

my answer is:

USE THE SEARCH, IT IS YOUR FRIEND!

Nah, seriously, sorry to shout, but there have been loads of topics (some of em really good if you filter through them) on this very subject. Have a read through them all, you'll learn alot.

I don't think they have any synchromesh on any gears either?

and yeah, they do have syncros

[Jammy]

OMG! Seriously, I used to joke that no one else could see the search button, but now I'm beginning to think its true...

[The Matt]

OMG! Seriously, I used to joke that no one else could see the search button, but now I'm beginning to think its true...

Perhaps it should be mahoosive and red?

[Sammy D]

Like this;



Click it

Edited by Sammy D, 10 November 2006 - 05:44 PM.

[mini93]

isnt it dog box's that dont have the syncromesh, which is also another point that eliminates power loss due to more surface contact or something

ooh oh search i cant see the big red button above

[taffy1967]

Yeah i'm blinded by the big red light!

[andywaller]

Like this;



Click it

genius lol

[Jammy]

Oh yea, and moved...

[998dave]

A full answer for once.

Manufacturers but helicoil gears in cars for a reason, and not because they've pretty or much more expensive to make, it's infact because you increase the contact area between each gear wheel and generally have three teeth 'meshing' at a time. This reduces load on any one tooth and makes for a mroe reliable and longer lasting gear set.

Straight cut gears do indeed reduce friction and side loading, and are more efficient, however they're not as reliable, long lasting, or quiet.

As an aside, most cars have straight cut reverse gears, which is what gives you that whining noise, and mini's (and metro's, etc), have straight cut first gears! Which is how you can tell it's a mini pulling away when you can't see it!

Hope that helps!

Dave )

[gadgets23]

A full answer for once.

Manufacturers but helicoil gears in cars for a reason, and not because they've pretty or much more expensive to make, it's infact because you increase the contact area between each gear wheel and generally have three teeth 'meshing' at a time. This reduces load on any one tooth and makes for a mroe reliable and longer lasting gear set.

Straight cut gears do indeed reduce friction and side loading, and are more efficient, however they're not as reliable, long lasting, or quiet.

As an aside, most cars have straight cut reverse gears, which is what gives you that whining noise, and mini's (and metro's, etc), have straight cut first gears! Which is how you can tell it's a mini pulling away when you can't see it!

Hope that helps!

Dave )

now thats the perfect answer that could'nt of done better meself
Mick ...

[998dave]

A full answer for once.

Manufacturers but helicoil gears in cars for a reason, and not because they've pretty or much more expensive to make, it's infact because you increase the contact area between each gear wheel and generally have three teeth 'meshing' at a time. This reduces load on any one tooth and makes for a mroe reliable and longer lasting gear set.

Straight cut gears do indeed reduce friction and side loading, and are more efficient, however they're not as reliable, long lasting, or quiet.

As an aside, most cars have straight cut reverse gears, which is what gives you that whining noise, and mini's (and metro's, etc), have straight cut first gears! Which is how you can tell it's a mini pulling away when you can't see it!

Hope that helps!

Dave )

now thats the perfect answer that could'nt of done better meself
Mick ...

Of course it's perfect, I'm a professional! :-P