2litre gear box 1800 engine

[Monkey]

Hey guys could be a silly question but I have a 73 bay window with a 1800 motor and was told if I put a 2 litre gear box in it it would be a better ratio and I would get more power ? Anyone heard of this or have any advice. If it is better is it a straight swap over?  Thanks in advances

[Barry]

Whilst the 6 rib 2L gearbox is a good choice there is a whole world of effort (pain?) changing clutches, flywheel and starter motors. 

Better - probably 

More power - no. Your motor is the same. But better gear ratios

Simple - mmmm….. not really

Cheap - no


Might be easier getting your 5 rib rebuilt to 6 rib ratios?

[Barry]

Oh….. no such thing as a silly question

[Wayne Murray]

What type of gearbox you got know in it, as you have an 1800 motor doesn't mean you have an 1800 gearbox?!

[Orangina]

Hello,

all of the dimensions changed in 8/1975 from type 002 to the 091 gearboxes (only 15mm in total, but some parts are shorter, others longer) - so there is no easy exchange. it is possible, but not plug'n play. You need to mix parts so the gearbox fitting somehow in your bus.

So I expect you have a CM for the 1.8L type 4 with 4,857 ratio.
A CE for the smaller 1.6L type 1 engine with a 5,375 or later 8/73 5,428.
My late 2L type 4 with CP gearbox have a 4,571 ratio - is not a racer or good for hill climbs, but good for high way - often quieter due to some lower engine rotation speed.

good luck,

[Tintop]

hi, go underneath and count how many ribs on your current gearbox... 
3 rib gearbox will give you the best acceleration but it'll rev a bit harder on the highway
5 rib gearbox is a good match for the 1800 engine
6 rib gearbox will be slower off the mark but the engine will rev less on the highway (quieter and less fuel)

so it depends how you use your kombi ... I had a 2 litre engine with a 3 rib box and it was great around town (3 rib box needed a different input shaft, bellhousing, flywheel, clutch and starter motor)