Sonntag, 11. November 2007
O-rings on both sides seal against the manifold and the Webers. The diameter is 40 mm (45 mm parts are available, too). Please check the necessary room in the engine compartment especially at Bertone GT cars with original air filter box. The carburetor support link and the throttle linkage must be prolonged, too.
Donnerstag, 8. November 2007
Furthermore they did nitrating, straightening and polished the slide bearing areas. Clearance between the lobes and the head is ok.
Donnerstag, 4. Oktober 2007
- max. lift 10,97 mm
- duration 286 deg @ 0,35 mm clearance
- 243 deg @ 0.05" clearance (for those who are Americans)
- 248 deg @ 1,0 mm clearance
- timing: 110 deg lobe center (on both inlet and outlet cam)
- max. valve opening overlap @ TDC 2,5 mm
To improve the profile I calculated the lobe geometry according to Benzingers Formula using smooth intersections between triangular mathematical spline formulas. These cams are regrinded from original Alfa 105480320051 camshafts by CAMPRO, Bochum/Germany. See http://www.campro-technologie.de.
Sonntag, 22. Juli 2007
The head is milled to a total heigt of 111.2 mm. As a consequence the diameter of the in-head combustion chamber is only 77 mm. It is 1 mm smaller compared to the engine bore of 78 mm. To avoid collision with the piston a chamfer is often recommended when milling the 1600cc head to achive high compression ratios. I measured the volume of the in-head combustion chambers to 63 cm³ each.
These are the new parts of the valve spring mechanism. You can see the inlet valve (bottom), the sodium filled exhaust valve, spring seat, shim, inner and outer valve spring, spring retainer and two valve keys.
As you can see, the valve keys at the outlet valve are different from the original Alfa inlet valve. They have three "rings" instead of one. I sourced them directly from TRW Automotive GmbH, Hauptstraße 10, D-31699 Beckedorf (TRW No. K8A090M0).
In addition to that there are a set of new valve guides, valve gaskets and valve seats with a three angle valve job (15/30/60 deg). To be continued ...
Samstag, 14. Juli 2007
The tube to the cylinder head cover is not mounted due to an oil catch tank on the exhaust side of the engine.
Donnerstag, 12. Juli 2007
Mittwoch, 11. Juli 2007
- intake and exhaust valve guides
- new valves, exhaust valves sodium filled
- new higher lift performance camshaft (286 deg, 11 mm lift)
- prologation of the intake port system
Theilacker has a long tradition as a maschine shop for large gasoline (Deutz) engines. In the early days they had a mobile replacement parts service for MWM engines. MWM is Motorenwerke Mannheim. They supplied for example farm tractor maufacturer like Fendt or Eicher.
Sonntag, 17. Juni 2007
Montag, 11. Juni 2007
vehicle speed * acceleration * weight of the vehicle = power at the wheels
The more accurate the vehicle weight is entered, the better the measurement will be. I asked the people from a local grain mill to use their scales and got 1145 kg with driver. The G-Tech deliveres rear wheel horsepower. This horsepower includes the loss of power through the drivetrain which is approximately 15%. Rear wheel horsepower is what most people are interested in because that is what they experience when driving. The use of flywheel horsepower measurement is often used in advertising, but not very realistic when it comes to accelerating the vehicle.
For more information about the G-Tech RR device see here: G-Tech-Home
This is the result of an actual measurement after some work with MS Excel. The red line is the calculated torque at the driven wheels, derived from acceleration and weight.
The blue line is calculated wheel horsepower. The 1600cc DOHC engine with some modifications produces about 90 hp at the rear wheels. This means approximatily 108 hp at the flywheel.
There may be some uncertainties in this result because this is only one measurement. I have to make several measurements and then calculate mean values. This story will go on ...
Samstag, 9. Juni 2007
The sensor I use is a wheel sensor with magnet glued on the inner side of the rim. If a cardan-drive shaft sensor is used, the wheel circumference must be multiplied by 0.2195 to get the wheel size factor.
I calibrated the speedo with a GPS based navigation system. The correct wheel size factor for 195/60 R 15 tires is 1882 mm.
Digital instruments unfortunately are not always allowed in historic rallying and this particular one has not backlight function.
Freitag, 8. Juni 2007
- Bilstein shocks
- Superflex Poly bushing between trailing arm and upper lateral arm
- Lemfoerder forged upper lateral link (# 032.311.003.501) with reinforced inner bushing (taken from lower A-arm)
Toe-in: 0° 14' (positve toe-in, 3 mm distance between rims)
Camber: 0° 20' +/- 30'
Max. camber difference between left and right wheel: 0° 40'
Caster angle: 1° 30' +/- 30'
Max. caster angle difference between left and right wheel: 0° 20'
King-pin inclination: 8° 35'
A pair of new brake lines (intermediate tubes) had to be manufactured. M10x1 nut thead thread fits the brake hose (steel hose type, see below) and M10x1 screw thread is used for the saddle thread. The brake force diagramm of the GT junior shows that there is not so much difference between the original brake layout and the Brembo/Alfa 75 design.
New steel-flex brake lines from Dickhaut-Specials were used, too. Remember that the Brembo caliper has M10 x 1. The line length is 38 cm at the front and 40 cm at the rear.
The calipers are made for wider vented brake discs. so I had to open the caliper and remove two spacers - thats all. Brake disk is Brembo, too, matching the GT 1300/1600 (diameter 267 mm). It would be possible to use vented discs. If you like, have a look at the Alfa Montreal disk or at Audi 90 GTE discs. The brake force according to the german TÜV measurement is 220 daN per wheel.
Mittwoch, 6. Juni 2007
|Production Years||1966-1977, |
earlier model from 1966 on with step-front,
from 1971 flush front,
later model GT junior 1.6
|Chassis #||105.30. LHD and 105.31. RHD|
|Number and layout of cylinders||4 in-line|
|Bore and stroke||74 X 75 mm|
|Horse Power||90 hp DIN, 103 hp SAE at 6000 rpm|
|Maximum torque||14 mkg DIN at 3200 rpm|
|Fuel supply||double Weber 40 DCOE 28 |
horizontal twin-choke carburetors
|Fuel tank capacity||46 litres (reserve 7 litres)|
|Coolant capacity||7.5 litres|
|Oil Capacity||6.5 kg|
|Gear ratios||3.304:1 I, 1.988:1 II, 1.355:1 III, |
1:1 IV, 0.860:1 V, 3.01:1 in reverse
|Final drive ratio||9/41 = 4.555:1|
|Track||front 1320 mm |
rear 1270 mm
|Minimum ground clearance||120 mm|
|Tires||155 SR 15 or 165 SR 14|
|Brakes||four-wheel discs, ATE-servo |
ATE 1-piston fixed caliper,
drum in hat hand brake (rear)
|Steering||Burman recirculating ball |
|Turning circle||10.5 m|
|Electrical system||12 volts, 300 W|
|Weight||kerb 1020 kg, |
loaded 1360 kg,
measured weight 1145 kg (with driver & fuel)
|Acceleration||0-100 kilometers 12,1 secs|
Sonntag, 3. Juni 2007
I wounder how long the tiny LR44 batteries will hold the needed voltage. AAA type batteries certainly would be better. Let' see ...
Samstag, 2. Juni 2007
Here you can see the gauge mounted on the dashbord next to a DCF77 clock, a mechanical stop watch and a digital triple timer. The home made "Rallye Board" is illuminated and has further conectors for the GTech measurement device and a 12V outlet.
I use 10 mm spacers at the rear axle on each side to trim the vehicle to neutral steering.
Donnerstag, 24. Mai 2007
The sound is very exciting but not too loud. Increase in performance? - Dont't ask!
I purchased it from Stefan Götzelmann Vintage Alfa Romeo Cars. Nice work!
Mittwoch, 23. Mai 2007
Seat consoles must be adapted to the car by two pairs of sheet metal (ST-37 steel). Geometry differs from vehicle to vehicle. A drawing example see here:
How would a pair of red Schroth ASM autocontrol II safety belts would look like?
Tyres were Continental Sport Contact 185/70 R14. These wheels gave the GT junior a distinctive "German Look" of the early seventies. Unfortunately these tires offered a very good ride comfort but no sporty driving properties.
The wheels had a lateral and radial run-out of more than 2 mm. This lead to tremendous vibrations at speeds between 80 an 120 km/h. As a result I graded up to 15" wheels or use the standard 14" steel wheels with inox Alfa hub caps.
The MSD Ignition features a capacitor which is quickly charged (within one millisecond) with 460 - 480 volts and stores it until the ignition is triggered. With the CD design, the voltage sent to the coil is always at full power even at high rpm.
The MSD 6 Series produces multiple sparks for each firing of a plug. The number of multiple sparks that occur decreases as rpm increases, however the spark series always lasts for 20° of crankshaft rotation. Above 3,000 rpm there is simply not enough "time" to fire the spark plug more than once, so there is only one powerful spark.
My MSD 6 is triggered by points. I use the BOSCH distributor # 0 231 110 044 JF4 which has a two stage advance curve with a steep advance gradient below 2000 rpm. Starting o fthe engine has improved very much when using new NGK BP6E plugs instead of Golden Lodges. The MSD control unit is mounted next to the air filter housing.
Have a look at the aluminum oil catch tank next to the battery improved in appearance with a K&N filter. BTW: There has never been oil in it, so what.
Red silicone ignition cables are a MUST on 105 Alfa engines. :-)
Sonntag, 20. Mai 2007
And this is the original interior of the Alfa GT 1300 junior (step front) -
the two spoke steering wheel looks a little bit simple and dreary.
My latest mod: Wooden Hellebore flat steering wheel. If you need help to get such a bright, shining surface I recommend Claudio Tescari from Classic Car Parts in Cologne, Germany.
Scuderia Non Originale is a trademark of Gary Williams, Washougal, Washington, USA. Used by permission."
In 2005 I joined as "Director of the German branch".
"SNO was founded by a group of Alfisti in October of 2004, at the annual Concorso Italiano in Monterey, CA. The charter members live in the San Francisco Bay Area, mostly in the region south of San Francisco widely known as Silicon Valley. They include three engineers (Tom Sahines, Richard Lane and Ben Lamprecht), an auto parts manager and former Alfa mechanic (Steve Smith), a former Yahoo web wizard who now works for the government (Ted Williams), and former business owner turned lay-about (Gary Williams).
Cars include several GTV's & GTA's, an assortment of Giuliettas, a Junior Zagato, a Giulietta Spider race car, a Milano Verde, a stunning Turbo Alfetta GTV, and an ever growing list of other Alfas, Panteras, Ferraris, Maseratis, and other Italian makes."
There are only two requirements to belong to this group:
(1) You must be more enamored with Italian cars than is emotionally or financially healthy, and
(2) You must not be offended by fellow enthusiasts who change the wheels on their cars, modify mechanical systems, or make other changes, such as painting their cars non-stock colors.
To Become a Member
1. Reread rules 1 & 2 listed above. By joining SNO, you are acknowledging that you will pay NO dues, attend NO meetings, and will refrain from mocking non-originale Alfas and other Italian sporting machines ... at least not openly.
2. Send an e-mail to : SNO at greend dot com.