1.6 8v gearbox

[ben doodar]

Hiya. Could anybody tell me the largest gearbox I could fit on a small block 1600. I think it would be an f17, I'm hoping for around 160+ bhp is it possible to fit an f20 to a small block?

Cheers. Xx

[Andy]

Are you going turbo? Thats an impressive power figure any work in progress?

[Stuart]

F15 would be your best bet for sensible ratios etc.

The F number is claimed to be a gauge of torque capacity but its really not the case.

[ben doodar]

Yh going turbo. I've got a metro turbo carb and a gt25r turbo Courtney manifold + big front mount intercooler so far. Plan on using a z16se head with 1mm skimmed from the pistons or a spacer plate or a big thick head gasket, need to spend some time going through the parts catalog at work to see if there's a thicker gasket I can use I'm guessing on 160bhp tbh if Courtney's bodge did 150bhp at 10 psi I think we'll do a bit more than that with decent fuelling and better turbo and a little more boost. Im just waiting to finish a few bits on the shell before I get fully stuck in to the engine build. So I've not got shit going on everywhere should get stuck in in the next week or 2.

[boffer8]

F20 can be fitted to a small block, F20 clutch plate and small block cover, should be more than enough for you, getting rarer now as all the C20let boys have blown them up

[ben doodar]

F15 would be your best bet for sensible ratios etc.

The F number is claimed to be a gauge of torque capacity but its really not the case.

Yes I was lead to believe the f number to indicate torque

f15 would be from a corsa sport wouldn't it?

cheers.

[ben doodar]

F20 can be fitted to a small block, F20 clutch plate and small block cover, should be more than enough for you, getting rarer now as all the C20let boys have blown them up


A few years ago I had 2 f20 gearboxes and couldn't give them away... Typical ay.

I think an f20 would be best really. Thanks for that I wasn't sure if the f20 would actually bolt up to the small block. Any ideas on what clutch I should use. My mate who will build the engine seems to think its going to want a paddle clutch.

[Andy]

F15 would be your best bet for sensible ratios etc.

The F number is claimed to be a gauge of torque capacity but its really not the case.
Yep total load of bollocks.Theres people running f13 with decent power 20xe on the ovals.

[ben doodar]

Umm so f15 would be more suited than f20?

Im all ears..

Really i want something that's going to be strong and not explode in to a million smitherings!!!

[Edd]

F13 will be fine

Craig had 170+bhp from his Courtenay converted 1600 and ran a F13 with no problems

I'm going to run a brand new GM F10 on my 1300, I expecting no problems

Courtenay standard boost for 150bhp was more like 6/7 psi BTW

[ben doodar]

F13 will be fine

Craig had 170+bhp from his Courtenay converted 1600 and ran a F13 with no problems

I'm going to run a brand new GM F10 on my 1300, I expecting no problems

Courtenay standard boost for 150bhp was more like 6/7 psi BTW

Brand new gearbox? Nice!!

I always thought the Courtney conversions did 10 psi.
I broke several f13 boxes in my old GSI I didn't think one would take an extra 70+hp did Craig's use a standard clutch as well?

[_Tomiboy]

My setup is 154 HP and i had never problem with the gearbox.

[ben doodar]

My setup is 154 HP and i had never problem with the gearbox.

what is your set up and what gearbox do you use?

[Southie]

If you decide to go for a F13cr or F15cr they are exactly the same ratio in case you wanted to know.

[BRoadGhost]

In my experience it's how you change gears that'll destroy teeth (& more or less entire boxes); I've just recently turned my F16CR to pieces, but that didn't stop me driving it home with just 2nd & 4th!

[_Tomiboy]

Smallblock 8v stroked to 1.8, kent Ast18 cam, 40/32,5 mm valves, 40mm ITB, big exhaust manifold...
I use F13CR with 4,29 final.