is there a type 9 that would take 300 bhp ?

[carmad]

as above looking advice here really

 

originally the box came from a 1.6 capri laser

 

dont wanna change the way the input is or the out put shaft

 

to be honest i dont wanna change the size of the gear box either

 

but i am looking to put around 300 bhp threw 1

[antz]

cossie T5 box is prob your cheapest and safest bet with 300bhp

[carmad]

i know about the t 5

 

but i asked about the type 9 (i have my reasons lol)

[sambo]

No way would a t-9 take 300bhp! Not turbo anyway!

[BIG G]

Yeah i reakon it would last a while. Give it a go as they are pretty strong and put up with V6 torque ok......... prove the money throwers wrong

[Wessie]

chuck some straight cut gears in

[bortaf]

start with an XR4i T9 cut the input shaft down and fit a quaif top cover, tis the best standard T9 you can get, still won't last long, seen a few last behind 24v but only if the driver is sympathetic

[Guest MK1gaz]

Straight cut type 9 dog boxes would cope but cost about £4000 !!!!!!!!

[Vista]

Where did this myth that Straight cut gears are stronger than helical ones start up from?

 

Nosier - Yes

less friction - Yes

So less power loss - Yes

Stronger (with like for like size gears) - absolutely not!

 

More details in this thread: -

 

http://www.oldskoolford.co.uk/phpBB2/vi ... highlight=

 

I'm sure a type 9 can be uprated to take that kind of power, quaife do a variety of options for the T9 that might meed your needs, but all are expensive. Here's an example that they recommend for up to 275bhp

 

http://www.quaife.co.uk/Ford-Sierra-Typ ... y-maincase

[Guest MK1gaz]

Straight cut boxes are stronger though . That's why uprated gearboxes are always straight cut isn't it ?

[petrolhead]

I think straight cut gearboxes are stronger, but not because of the design which is inherently weaker but because of the superior metal used by the top companies for straight cut gear sets

[Guest MK1gaz]

Ask Retromotorsport cos he will know why uprated competition gearboxes are always straight cut

[Burns]

reading the information it shows that straight cut gearboxes have less friction and less power loss through the 'box. but because there's less contact between the teeth there's less strength in them (unless they're made of a stronger material)

 

that's what it says anyway

[Guest MK1gaz]

Straight cut gears must be stronger or else they wouldn't all use them would they ? . Surely they would use normal gears if they could .

[Vista]

Straight cut gears are not stronger. At any one time in a straight cut gearbox you have one pair of teeth in contact with each other and they are heavily point loaded. Whereas with helical gearing the power is transmitted progressively through about 3 pairs of teeth.

 

Straight cut gears are used in competition because they are more efficient at transmitting power down to the wheels and power/torque wins races doesn't it? The reason that they're more efficient is that helical gearing produces end thrust which must be taken up with thrust washers/bearings/cones, this causes friction and generates heat sapping power. Double helical gearing gets around this (opposite helix's on the same gear wheel) but that would make them too big and heavy for car applications.

[carmad]

what do you think that a good type 9 would take?

[Guest MK1gaz]

what do you think that a good type 9 would take?

Depends what your bolting to it but they all make 270-300bhp rated straight cut type 9's . There's 300bhp 450ibls feet chevys or 300bhp 200 ibls feet 4 cylinders so it will depend

[carmad]

so this might hurt it then

 

[sambo]

Listen to Vista and the facts! straight cut gears are for competition and the reason being is that there are less drive-train power losses with them compared to helical cut gears. Straight cut boxes wont last as long as a 'normal' box but what does when it's application is for race/competition use!

I think the original post is whether a std T-9 box will cope and i think the answer is NO?, not for long anyway!