Differences in parts between QV FI and QV DD engines?

Also, on the Fuelie crank, some of the oil bores or channels are blanked.

Raymond also commented that the position of the rod-bearings is different.
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Another very obvious difference between a Downdraft and a Fuelie engine is what you see.

The Downdraft's block is crowned by 6 Weber 44 DCNF vertical twin-barrel carburettors (first image) and the Fuelie has an intake manifold.

Has anyone weighed the 6 Webers versus the entire intake manifold application?
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The mounted induction system difference show in the side-profile of the engines, the Downdraft's Webers rise a few inches above the unit in the center, the Fuelie's intake manifold does this at the sides.
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?

 

The rod bearing holes are in pattern on both, it's entirely possible they are drilled that way after the first hole. The dd crank does have the oil holes chamfered, or slightly enlarged at the opening. It's a speed trick, that may have been done by the factory, or by someone else at a later point. I don't know why the front groove would be different. A guess would be it was an improvement done on a later engine. You really need a few more cranks to compare, of both engines.

 

Exactly, and this is the basis for that observation, I think both the Downdraft and Fuelie used for comparison here are factory with their engines never before apart, but I will let DaniT confirm.

 

I have a DD crank out at the moment. Will post it when I get a chance.

 

Good illustration of the two different exhaust systems. Smiley face. Poss a joke or two inn there somewhere. Based on previous posts on this topic .

 

I have built many of these engines, QV and 4 ltr. ONLY the 5000S and the early, up to 12539 QV engines use the crank like that.
Also there is a difference in the blocks, difference in the oil restrictors, difference in the oil pump.
Anyone who has ever built a 4 ltr, 5000S or QV or very late QV, 12540 and later, would know the differences.
To those who just talk about or write about cars, but never build an engine, you would never know the difference.

Chadbourn Bolles

 

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I believe the intent of this thread is to share that information here. I don't believe it is intended to be a competition.

 

Actually, I think I am wholly correct in my description, because the crank I show on the left is in fact from an (early) 1985 Downdraft.

Again, just pointing out some differences observed in the engines of Downdrafts versus Fuelies, and having spoken to factory engineers, believe me, there are many differences.

 

Exactly David, its all about observing the differences and pointing them out, nothing more or less, no conclusion necessary, that can be left to individuals to draw their own.

 

I o w, they purposely build one version with flaws,as in not as reliable/dependable(not shure wich one ) as the other ,just becuase the felt like doing it that way?

 

I hate to say this for fear of it being taken the wrong way but these 2 picts shows exactly why the DD will be more attractive than the Injected: simply look at the engine bay and think about what is cleaner and looks better as mechanical art.
I recall that when I shopped for my CT the first one I had inspected was an injected and I found the bay to be a intimidating mess of wires and asking myself how can anyone work on this?
The DD on the other hand was more "comprehensible" in its simplicity and apparent functions.

 

Although I actually don't mind the look of the plenums, the engine does look very busy. Way too many hoses/wires/doodads. Compared to the DD in my LM it looked kind of intimidating and (stringy) to work on. Removing the emissions related hoses helped the clean the engine bay up a lot.

Also the FI Anniversary looks even more complicated with the plumbing it has running underneath the intake hoses. I'm sure it was an improvement in some way if they decided to change it though.

 

you bought a Countach, beeing on this level of tech info?

 

The pictures you speak of showed the Downdraft without the air-box, so in all fairness, these 2 images below are a better comparo of the visual differences between the Downdraft and Fuelie engine bays in completed form.
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Agreed.

 

Were such changes reflected in different part numbers?

 

Yes, the US Version has an own section in the parts catalog, quite huge!

 

That is what I thought. Is there a required level of tech info to buy a Countach? If so, can we post the list of requirements for would be purchasers?
My assumption is that some owners do nothing, some do the basic maintenance like fluids, some part changing and plugs (which would be me) and some do carb tuning and pull engines out. I guess the later would not care how art like the bay looks. Now everything is disclosed.
Some of us also like to have their eyes pleased all around when they make large purchases.

 

All good points.

 

Good post , i like the look of the 12 runners and the cast manifolds/Lamborghini logo, to bad those pretty carbs are covered in the dd, clean up the air pump mess and hose arrangement on the fuelie, it looks very nice and industrial/machinery like.