147 1.6 gearbox differences? - Alfa Romeo Forum
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147 1.6 gearbox differences?

Hello again!

I think I'm gonna need a "new" manual gearbox for my 147.
It's got a 1.6TS with 105HP.

What I wonder is:
Is there any differences between the 105HP and 120HP gearboxes?
If yes, what are the differences, and will a 120HP box fit my car?

I find lots of boxes for the 120HP 1.6TS, but not for the 105HP engine.

The reason I belive I need a new a box is:
The box started jumping out of fith gear. I drained the oil, and the drain plug had more metal-waste on it than I'm comfortable with.
With new oil the box now stays in fifth as usual, but the shifts are a bit harder than before this started, there is also a new sound from the box, witch disapears when I'm engaging the clutch.
This could be the clutch release bearing, but the sound is a bit different from what I'm used to with clutch release bearings (Worked 4 years at a Peugeot dealership as a serviceadvisor, heard lots of them).

Previous owner claims the clutch was recently replaced. I belive that, but guess it was done in a backyard, and by the feel of the filler-plug on the box, they probably did not top up the oil after replacing the clutch.

Any help appreciated!

Fredrik
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In the 147's the TS's are all the same box (internal clutch slave cylinder) with different gearing:

FIAT ePER

Between the 156's in years you have to make sure if they have the external clutch slave cylinder or the internal clutch slave cylinder
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Thank you!
ePer looks really useful

Does anyone know how much of a difference there is in gearing on these boxes?
The 105HP is really slow as is: i don't want to make it even worse by putting longer gear ratios on it

Thanx again!
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The 105HP was built for fuel efficiency, its gearing is long indeed.
In the eper link I shared before, you can see the final drive ratios:

105HP (75kw) = 52/14 = 3,7
120HP (88kw) = 61/15 = 4,06

Here is 5th gear:
FIAT ePER
105HP = inverse(34/33) = 0,971
120HP = inverse(37/34) = 0,919

So the total reduction for 5th gear:
105HP (75kw) = 3,7 * 0,971 = 3,5927
120HP (88kw) = 4,06 * 0,919 = 3,73114

That is a good 4% gearing difference (the 105HP revs lower for 100km/h) and thus have less wheel torque. The 120HP gearbox will feel 4% quicker
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This is brilliant info!
I'm used to buliding muscle cars, I'm well aware of gear ratios .

My car will mostly be used for city driving, so higway-speeds and consumtion really is not important.

How will this affect indicated speeds? is the speedometer run by wire or cable?

Thanx again!!
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Quote:
Originally Posted by mach1frh View Post
How will this affect indicated speeds? is the speedometer run by wire or cable?
Speedo runs off of the ABS system.
So gear ratios don't change that at all.
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This is all good news!

Thanx everyone
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Hi Mach , where do you find the 147 1.6 120bhp gearbox ? , I'm just looking for the crown wheel an main shaft as my crown wheel are missing couple teeth , the car has a 2.0 gearbox in it at the momment an feels very lazy I'm getting 3000 rpm at 120 km , the right ratio for the car is 61/15 = 4.06 , please if anyone can help I'd appreciate it , regards
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Quote:
Originally Posted by ryloz alfa View Post
Hi Mach , where do you find the 147 1.6 120bhp gearbox ? , I'm just looking for the crown wheel an main shaft as my crown wheel are missing couple teeth , the car has a 2.0 gearbox in it at the momment an feels very lazy I'm getting 3000 rpm at 120 km , the right ratio for the car is 61/15 = 4.06 , please if anyone can help I'd appreciate it , regards
Ryloz, in SA we got the 120HP version. The 105HP is only released in very few countries where emission laws are very restrictive and have high carbon taxes

https://web.archive.org/web/20140913...on_(2002).aspx
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