S1 engine in S2 body?

[Zanetti]

I haven't had a chance to check yet but what are the differences between the two distributors? That is between the 302 which seems to have it's cap with vertical HT lead connections and the 303 which has horizontal HT lead connections?

[Andrea Nistri]

Any significant and not readily reversible change from an original car will substantially decrease its value, should one ever think of selling it. Andrea

[Charles]

Zanetti Wrote:
-------------------------------------------------------
> I haven't had a chance to check yet but what are
> the differences between the two distributors? That
> is between the 302 which seems to have it's cap
> with vertical HT lead connections and the 303
> which has horizontal HT lead connections?

According to the Dati Technici the 302 and 303 engines use the same distributor: marelli S 105 C. Probably you have two different distributor caps on your engines.

[fulvia a.i.]

here I am, neck deep in snow, having wisely cancelled travel plans for this eve out on the icey highway.
Great, I have a jump-start on my Q & Q post. Br = Berlina Cp = Coupe Sp = Sport

btw: I know that everyone already knows this, or not ? ...just being a 2 door automobile does not make a car a coupe. For an Automobile be to be coupe it must be the 2 door version of a automobile built on a shortened floor of a 4 door automobile. There is no rule as to how much shorter the floor must be.

from "The Fulvia Saga - Birth of a Classic" I quote:

Mechanically the Sp was identical to the Cp except for a different final-drive ratio of 3.70: 1 against 3.909:1 for the Cp. The lower gearing gave it a higher tope speed of 169 vs 160 and a lower fuel consumption.
I wonder why 3.7 was deemed better for the Sp & 3.909 was deemed better for the CP ? Why was the final drive of the Br always different than its siblings ?

Does this mean: for every 3.7 turns of the crankshaft the drive wheels turn one time ?

not from the above article: Fulvia Br final-drive 4.78:1 vs Fulvia Br 2C 4.55:1 / from yet another article - vs Fulvia Br 1.3 4:10:1.

from "The Fulvia Saga - One-Point-Three" I quote: Sp & Cp were machanicall identical except for a final drive ratio of a further lowered 3:545:1 for the Sp & the 3.1:1

from "The Fulvia Saga - Toward More Power" I quote: a 5 speed gear box.....had 1st gear to the left of H...likely to be driven in the top 4 gears...1st being the odd man out.

from M.N. Road Test Fulvia Sport 1.3S I quote: Ratio 4th 1:00:1 Final Drive Ratio 11/39.
I say: 11/39 ? what does this mean ?

just for comparison: from Autotest 1.6HF ratio Top (5th) 3.70

Sport Car Graphiv Test Fulvia HF 5/67: Ratio 4th 1:0 Final Drive Ratio 3.9.
I say: 11/39 ? what does this mean ?

Why was 1.6HF Ratio 3.70 & the directly above ratio 3.9?

Motor Road Test 26/67 Fulvia GT: Top Gear (s/m) 1.1

just for comparison: Alfa GT 1300 Hr : Gear Ratio Top: 0.86

Now that I have gotten this far - to keep things simple:
was Lancia just trying to wring every mille-second of peak acceleration performance from each model; adapting the final-drive-ratio to meet expectations at the cost of highest possible top speed & regardless of consumption ?

[adan figueroa]

I recently replace my 1.2 engine to 1.6HF in my S1 Fulvia coupe, it was not that easy as it looks, and after many people try to help, I was able to do it, I still have the 4 speed Trans, I have owned in the pass from 2C to Fanalone all fulvias S2 and S1 saloon and coupe. both transmission are very nice, there is no problems with their final drive, 5 speed is nice in the S2. I had 1.3s coupe and Fulvia Montecarlo very please, and the 4 speed the 818-130 Trans also very nice, if I was you do not install the 4 speed since you will know have a big unnecessary job, like reversing the way of the floor tunnel, and replace the rear cross member to S1, and drive shaft are different which at the end of the wheels where it connects to steering knuckle also different hubs, many little thing you no not see now, don't do it live it alone.

[Ed Levin]

11/39 is the final drive gear ratio: 11 teeth on the pinion and 39 teeth on the crown wheel. 11 into 39 is 3.55. Therefore you can describe the ratio as either 11/39 or 3.55:1--they mean exactly the same thing.

The ratio choice is always a balance between acceleration and top speed; generally you want the "longest" (lowest) ratio that still allows acceptable acceleration. And that balance is a function of power (the more power, the longer the ratio can be), weight (the more weight, the "shorter" (higher) the ratio needed to maintain decent acceleration, and aerodynamics (the slippier, the longer the ratio can be).

The S1 Sport 1,3S has an 11/39 (3.55:1) final drive, instead of the S1 Coupè 1.3's 10/37 (3.70:1). The Sport has better aerodynamics than the Coupè, and therefore doesn't need the lower ratio to overcome wind resistance on the highway. With less power than the 1,3, the S1 1,2 Coupè has an 11/43 (3.91:1). And with more weigfht and less power, the berlinas have shorter final drives, ranging from 9/43 (4.78:1) for the 1C to 10/41 (4.10:1) for the S1 GTE.

The S1 1,6HF came standard with a 10/37 (3.70:1), which the factory presumably deemed the most sensible compromise between acceleration and top speed for street use. But there were 7 different ratios homologated for the 1,6HF, all the way down to 7/31 (5.86:1), and most competition cars used "shorter" final drives than 10/37. The circuit racing prototype that ran at Daytona in 1970 ran a 10/41 (4.10:1), and the rally cars might have run even shorter ratios, like 9/41 (4.56:1) or 9/43 (4.78).

[Huib]

Note that if you put an S2 gearbox into an S1 car, you also have to change the tire size from 145R14 to 165R14 to have the sime km/h per 1000 rpm.

[fulvia a.i.]

very interesting "Subject".

thank you Ed for the "clear as Chrystal" explanation

& to Adan "don't do it, leave it alone"

[Ed Levin]

Huib,

Of course the proper tire size depends on which S1 or S2 gearbox has been swapped in. But Adan did exactly the opposite of what you're saying; he changed the engine for an S2, but left the S1 4-speed in place.

[John Simister]

Just to add a bit of mischievous confusion, short gearing = low gearing in English (hence first gear is lower than top gear), short gearing = high gearing in American because the ratio is numerically higher. What is the convention in mainland Europe?

John