Project 75: Dal pollaio alla pista (parte 4) – Davide Cironi Drive Experience (SUBS)

Project 75: Dal pollaio alla pista (parte 4) – Davide Cironi Drive Experience (SUBS)


Davide: “Hello, how is it going?”
“Fine, thanks” Ezio Campoli: “This is an Appia engine, the one from which the Fulvia one derived… This is a 1.1 V4 engine… There was the Sport Zagato where they modified the intake manifolds and added a bigger carburetor… this one though made up to 100 horses if you tuned it properly” Davide: “Did they make other V4s?” E.C: “No other… I think they started with the Ardea but was made of cast iron, this is the evolution… Anyway, this is our crankshaft”
Davide: “Which one?” E.C: “Now he will put it on the lathe to remove all these microscopic grooves, even though you can’t even see them: this engine was treated very nicely” Davide: “You would have never said that if you had seen it first… Do you know we found her first owner? He texted me saying: “That was my car, then I sold it”… He’s a photographer now, so he said: “When you have finished it, call me: I want to make some photos”. Unbelievable…” E.C: “The nice thing is that we didn’t need to balance it, the few hundredths we’ll remove are nice also under a friction point of view, that’s also how you make a competitive Group N engine: mind the friction while keeping the parts in tolerance with Alfa Romeo specs These are things nobody would do, that’s why this video will be great: because no mechanic does these works” “See the difference? Here the oil will slip perfectly… You’ll see it spinning free on the test bench as if there were some bearings Tell me about the measures” “They are the same as the standard ones, let me check again” E.C: “This is steel. The 2.0 and 1.8 engines were made of steel, heat treated too. Alfa Romeo didn’t even put plain bearings on the early 2.0s, then they obviously put them” “It’s right… we are at 97, where 97 is the maximum, 95 is the minimum” E.C: “This dark color here is because it’s the carbonitrided version” “Yeah, normally the color would be like that, but this…” E.C: “… this material is truly good: the GTAm with 240 hp had this crankshaft too, it was obviously modified and lightened. We did some, remember how hard it was? We had to use the milling machine” “He wanted to try threading here, but…” E.C: “You can’t thread there” “We broke the tap inside and… So long” E.C: “Ok, this is finished. We can start mounting” “After that, I’d like to hear it running” E.C: “Of course, the car is not far” “Perfect, because hearing it running is a greater satisfaction than checking measures” Davide: “Don’t worry, we’ll take her here. That’s for sure… Hearing it will be the best satisfaction” E.C: “Let’s put all these parts together” Davide: “Good morning” E.C: “These are the steel H beam rods with Arp bolts. Since we chose forged pistons instead of the original ones, we have a higher compression ratio and the camshaft added revs to our engine, so for safety reasons we preferred to use these steel H beam rods too. Let’s take a look at them… Since we’re in business, let’s check the balancing so we can understand the quality more, by looking at them it seems like they did a great job though” Davide: “We are going to check because we both never used these rods before, right?” E.C: “Yeah, I’ve never tried them before” Davide: “They are great to look at though” E.C: “They seem nicely finished, the bolts seem right, I like them overall. Now let’s see… this is some sort of certification” “Ok, let’s start with this… we’ll later check the tolerance too. Ok, now we set the 0: the other 3 have to match this and obviously the whole weight too” Davide: “Compared to the original, how much do they weight?”
E.C: “We’ll check that too” “This one is perfect, just like the first. Even from this, we can say it’s a quality product. Let’s check the others” “The head is now ready, the guides have been replaced, the seats are now made of sintered steel to use the regular gasoline without adding lead additives, we linked the suction duct with the manifolds, the gasket is now reinforced with stainless steel rings that withstand the higher compression ratio, the Colombo & Bariani street machined steel camshafts are already in: I think they need no introduction, above all Alfa Romeo ones… As I said they are already in and already adjusted. The tappets are new and original, now we are ready to mount it” Davide: “Bariani told me that these camshafts for Giulia GT are still their best sellers” E.C: “Because the cams are narrow and they favor low-end torque, otherwise you’ll need a shorter gear ratio because the torque would move up. For a street use this is great, these cams are used on Group 1 and those engines with these camshafts make around 150 horsepower” Davide: “Good” E.C: “We’ll see… These are the CPS pistons we showed last time, built specifically for Davide because we didn’t want too much compression, so they lowered the crown. By doing so, we’ll keep the compression ratio under 11:1 and it will work fine with the camshaft” Davide: “We started with different intentions…”
E.C: “… with stock pistons, then appetite comes with eating: “Let’s make this lighter, balance that etc”… and here we are with forged pistons, H beam rods, steel camshafts…” Davide: “Let’s compare the rods with the original ones” E.C: “Ok… You can already visually see the difference between the two: you can see this one is a racing component, finished as such, let’s check the weight difference It’s 621 grams for the H beam rod… … and 714 for the original one. Basically 100 grams of difference, it’s a lot, even though we are going to lighten them even more but the difference is remarkable” Davide: “We started lightening the original ones, but…” E.C: “The bolts are different too, the thread is made on the rod itself, something that doesn’t occur here on the original. This is the difference… H beams are also prettier” Davide: “I was looking at this too” E.C: “You have a wandering eye, Davide… This is an A112 Abarth head, made for the Abarth engine with 4 valves per cylinder: this, together with mechanical injection, on some engines back then made 153 horses at 11.300 RPM. This was a project and had to be mounted on a Formula powered by the 903cm3 Fiat 100 engine, then the project was too expensive and they replaced the engine, but they didn’t match the performance of this engine. We have got an Abarth head here with bigger steel valves and as you can see they both can be bolted on the engine without making any modification: many tuners use motorbike heads for hill climb racing, but you need to make substantial changes to the block, while here you just needed to change this one with that” Davide: “You also told me it was basically a scaled-down Fiat 131 head” E.C: “Yes, the chambers are smaller but similar, the ducts as you can see are like the 131, the camshafts are close to each other, so the head is narrow and the combustion chamber is quite low, so we could gain power. Here there are some fake camshafts because there was a problem on the second cylinder and it needed to be rebuilt: to avoid deformations, we put these steel bars” Davide: “How many of these were made?” E.C: “Back then these heads were expensive, so not many… We also called the one who made them at the time, he still has the molds and obviously he doesn’t want to sell them obviously, even though he’s no longer a tuner. Since this reached 11.300 RPM, there were a steel crankshaft with 8 counterweights, special rods, forged pistons… A cool object, hard to find nowadays”. Davide: “Let’s mess with Massimo, come over here. We watched the cool things, now he’s going to do the dirty job That’s cool” E.C: “On carbureted 2.0 75s, the crankshaft is still the Alfetta one. These aluminum conical caps here were punched to put them in place, Alfa Romeo later replaced them with threaded ones. Threading these though is extremely difficult because this is heat-treated steel, that’s why we kept the original system. Today if you are going to tune an engine, the whole crankshaft is redesigned to have 8 counterweights: Alfa Romeo in the 70s already had them, starting with the 1750, they made a more rigid crankshaft, easier to balance as well. Despite being a long stroke crankshaft (88,5 mm), the famous low-end torque of Alfa Romeo twincams derives from its good balance. They are lively, even though they stop at 5500 RPM” Davide: “Not ours though” E.C: “Well, yeah… obviously not ours” Davide: “Since I haven’t been seeing it for weeks, while Ezio is working, I’ve come to look at it… and it’s dirty. While Ezio is working on the engine, we’re going to clean it Let’s see if it works on poop too It reminds me of something, as if I went back to the first episode. We’ll need a lot of this I think… Ezio!” E.C: “It’s lunch time, right?” Davide: “and we’re going to drive there with a special car I saw outside” E.C: “It’s the courtesy car in theme with all of this… let’s go We’ll later have some work to do Seatbelts on, we have to set the good example” Davide: “Look at Stefano inside the trunk of the 75” E.C: “Live TV, folks” Davide: “Now he’s going to get hit” E.C: “We have to stop because these girls are thirsty and the gas pump is their natural habitat” Davide: “All this just to have lunch” E.C: “This is really her natural habitat”
Davide: “Poor Argenta” Gas station attendant: “Do you want to come in for a coffee?”
E.C: “No thanks, we’re going to lunch” Davide: “Look at the keys, they are the same as my grandpa’s Regata!” E.C: “Back then you put 10.000 Lire inside, now 10 Euros… Yesterday I put 20 Euros, today 10… the orange reserve light is still on though” Davide: “You’ve just burnt 3 Euros”
E.C: “That’s for sure! This was basically a Fiat 132 drawn by a child because children always draw straight lines. It can’t get more boxy than it is. The Turbodiesel was fun though As you can see, here we have the phone slot back in the 80s” Davide: “The Regata design was 100 times better”
E.C: “Just 100?” Davide: “What the hell happened here?” Girl: “If I knew you were coming, I’d prepare something special” E.C: “We do only spontaneous things, no script” “The rod bearings are still the stock ones because the crankshaft was never grinded luckily, I just cleaned them with this and I’ll use it to buff the back part too because sometimes there are some surface defects: something that needs to be removed on a performance engine. As you can see there’s a leftover from the antifriction treatment, something we have to remove… or, at least, I remove it These engines often need a reboring because they have 5 crankpins and they are made of aluminum, it’s not our case because the crankshaft was perfect, but if they suffered from a blown up, this part here becomes deformed and you realize that because when you put the crankshaft in, all lubricated, it doesn’t spin freely, so you have to do the boring to fix the flaw” Davide: “I’d never said it was a good engine, but…” E.C: “Nobody would have bet on the car after seeing it” Davide: “Here is where Ezio modified it, when he’ll put the plain bearings in…” E.C: “… I’ll have to pierce them as well” “These are the washers for the crankshaft and they have their oil passages too Here there will be a rubber washer, now we’ll just see if everything is okay: let’s take the torque wrench and tighten the bolts Ok, turn… see? When it spins like this, we’re safe Let’s keep on going, this is just to make sure there is no friction between the rod and the plain bearing and you can’t notice it if you already mounted the pistons… See? It’s perfect It’s not a matter of trust, but you can’t be sure about something coming from the Internet, this was not a familiar brand to me, so I wanted to make sure, but it’s perfect… I checked the axial play and the play on the crankpins, now we can definitively close it Let’s check the gap between the piston rings and the cylinder, so let’s put it inside and check the tolerance on it because when it gets hot, it shrinks and if the tolerance is not correct, there will be friction with the cylinder wall. Here there are 0.25, so it’s good: let’s put it back on the piston” Written and directed by Davide Cironi Filmed by Francesco Colantoni Filmed by Stefano Ianni Thanks to Thanks to Translated by Elia Pozzani E.C: “Can I tell you something? This little computer here works, unlike the 75’s one… The econometer is always on red The little storage area here… this is a well maintained car I have to put some gas in it”