Aldo Broverone's Opinion on Fulvia Sport

[racing]

renew of the windscreenwiper mechanic

regards Andreas

[racing]

the skin´s are back.

[racing]

How i did it.

seems i am comming to the end of the body work

regards Andreas

[racing]

It´s not the weather outside to work in the garage.

But i get the "christmas gift" as single part´s to start with the build up of the engine.

Have a look

regards Andreas

[Charles]

Clean and thorough; same job as the body it will propel. Looks like high dome pistons and a light weight flywheel. Any other mods to enhance performance?

[racing]

I will use an alu-clutch to reduce the inertia. ( better acceleration of the engine and the car )
Higher springrate of the valve springs,
compression ratio is roundabout 11,4 : 1

The cam´s will come with higher lift and other valve timing,
40er or 45 Weber ( to decide later ) and group 4 inlet
mainfold.
weight reduction of the rocker´s,

regards
Andreas

add.: By the way it is a 1,6 l engine

[ekranoplan]

Nice! I decided against lighter flyweel for racing so as to keep the engine spinning (momentum) - this works well if you have close ration gears to keep RPMs up.

Are those ARP studs?

I used domed pistons from Cavalitto and run Weber 45s.

Best Rgds

[racing]

But the higher inertia reduce the accelaration of the engine and the car.In particular at the 1 and 2 gear.
You can calculat it as a weight reduction of the car.
And the target for all racecar´s today is to reduce as low as possible the inertia.

I do this also for all rockers. Look at the picture enclosed. At the end of the rockers is to much material
depent on the production process.From left ( as production) to right ( optimized ).
And if you know that the acceleration of the valve´s is very high in particular with race cam´s it´s much easier
for the rocker´s to follow the cam profile.

Yes, this are ARP studs. It was the first time that i us this one. Very high quality of the thread toleranze, tensil strength,
and surface. Also the treatment for corrosion protection seem´s really good.
And the torque will not reduced by twisting like the production bolt`s.

regards Andreas

[racing]

enclose an example to show the influence of the mass reduction is.

Conversion of clutch weight into simulated vehicle weight


At first glance, one might think that the mass
of a clutch (5-10 kg) is negligible in comparison
to the mass of the vehicle to be accelerated
(ca. 1000 kg). What is often overlooked here,
however, is the reduction of transmission.
If the clutch itself has a moment of inertia
(MoI) of 0.061 kgm2, the MoI on the drive
wheel will be 180 times higher (in first gear)
for a reduction in transmission of 13.4:1 (13.42).
If we convert this value into vehicle mass, we
arrive around 145 kg of additional weight to
be accelerated in first gear. This inertia effect
declines as the gear ratio decreases.
Users should be aware of the following point:
Reducing the weight of the crankshaft drive to
lower the moment of inertia will considerably
increase vehicle acceleration performance in
the lower gears.

msim = simulated vehicle mass [kg]
J = moment of inertia [kgm2]
ü = reduction of transmission in gear tested [-]
r = wheel radius [m]
mk = mass of cluth [kg]

Standard cluth RCS 2/200 RCS 3/140
GMF 1/240 Sinter-Pad Carbon
J = 0,061 kgm2 J = 0,0304 kgm2 J = 0,0066 kgm2
ü = 13,4:1 ü = 13,4:1 ü = 13,4:1
r = 0.275 m r = 0.275 m r = 0.275 m
msim = 145 kg msim = 71 kg msim = 15 kg
mk = 7,34 kg mk = 4,6 kg mk = 1,98 kg

msim = J x ü² / r²

This calculation shows that a RCS 2/200
sinter pad clutch generates a weight advantage
of more than 70 kg compared to a standard
clutch (GMF 1/240 )

Regards

[bart]

May I suggest another possible 'improvement' of the engine:
replace the valve clearance adjusting screws by elephant feet type srews made by Rotax for their aircraft engines.
Beautifully made, straight fit and if cut off just above the locking nut they are lighter than the original screws (albeit not much). The engine is noticably more less noisy and less wear is expected on valve stems and push rods.

Bart