Difference between f10 and f13

[SR-Rally]

First thing, am I right in thinking an f13 cluster will fit straight into f10 box? Is it the same with diffs?

Also what is the difference between f10 casing and f13?

[mowgli]

the f13 bellhousing is larger to accomodate the later, larger flywheel & moved out starter position of the 1400 & 1600 mpi engines, but it will still fit onto a 1300 type block.

apart from really early f10 boxes that had different bearings, the f10/f13 innards are interchangeable

[SR-Rally]

Cheers again mowgli. I have a dilema at the moment. I have 2 boxes and want to make best possible box out of the 2.

One I'm currently using is a standard f10 with 4.53cwp and zf45% LSD.

Box I've just got is f13 with straight cut gears hockly 90% LSD. I haven't checked what cwp

Zf diff is spot on for what I use the car for, although harry said he could bring the 90% diff down to 45 for me but obviously will cost money. But the zf could do with a plate kit.

[SR-Rally]

Using iPhone at the moment so sorry it's hard to understand :)

The box will be going on a 1300 engine with a bit of poke :)

[novarally]

the f13 bellhousing is larger to accomodate the later, larger flywheel & moved out starter position of the 1400 & 1600 mpi engines, but it will still fit onto a 1300 type block.

apart from really early f10 boxes that had different bearings, the f10/f13 innards are interchangeable

Mike - you don't by any chance know if there's a weight difference between the F10 and F13 casings do you?

[mowgli]

sorry, i've never weighed one, but as the bellhousing is only slightly larger on the f13, i'd have to guess it is a couple of hundred grams heavier at most.

[novarally]

sorry, i've never weighed one, but as the bellhousing is only slightly larger on the f13, i'd have to guess it is a couple of hundred grams heavier at most.

Thanks, I've got a bare F13 casing here, so I must strip down one of my F10's and do a proper comparison.

I've got an F13 Quaife SCCR ready to go in my car, but if there's a weight saving to be had I must get it built into an F10 casing.

[SR-Rally]

I will have a completely stripped f10 casing in week or 2. Il weigh it if you like and let you?

[novarally]

I will have a completely stripped f10 casing in week or 2. Il weigh it if you like and let you?

Thanks, that would be most useful, let me know when you're ready.

[rallycraig]

Easy, put your f10 45% diff into you f13 casing. 25 minute job.

[SR-Rally]

Yeah that's what I'm planning on doing :)