Countach Downdraft 1985 to 1988.5

A golden oldie, sights & sounds for a long time ago, Downdraft QV & 25th

[ame]http://www.youtube.com/watch?v=T0d_-qqO-Hk[/ame]

 

Given the discussions in the other thread which contain erroneous assertions that the 2 basic engines possess the same potency, as a prelude to future postings on this topic upcoming, I thought it helpful to document certain internal main-component differences that the Downdraft engine (Motore Tipo L 507 V4 fitted with the 6 Weber 44 DCNF vertical twin-barrel carburettors) possesses.

The DD uses higher-compression pistons and more aggressive camshafts.

Comparing the DD pistons with the FI pistons its clear that they are shaped differently and the DD units are more aggressively domed.

Comparing the DD camshafts with the FI camshafts, the the DD units are more aggressively lobed.

As regards the pistons:
- Those used in the DD are part number 001420801 with a 9.5 : 1 compression ratio
- Those used in the FI are part number 001420828 with a 9.3 : 1 compression ratio.

As regards the camshafts:
- Those used in the DD are the following part numbers, 1220848, 1220847, 1220845 & 1220846
- Those used in the FI are the following part numbers, 1221851, 1221852, 1221871 & 1221872

Below are the DD's camshafts with confirmatory stampings, images by Daniel T.
Image Unavailable, Please Login
Image Unavailable, Please Login

 

Below are the FI's camshafts with confirmatory stampings, images by Daniel T.
Image Unavailable, Please Login
Image Unavailable, Please Login

 

Below in the 1st image is an example of the DD's domed higher-compression piston.

The 2nd image is an example of the FI's flat-top lower-compression piston.

Images by Daniel T.

If course, these posts comparing the DD with the FI engine are strictly according to original factory specs.

More to come.
Image Unavailable, Please Login
Image Unavailable, Please Login

 

JLA12294 @ Brooklands
Image Unavailable, Please Login

 

JLA12309
Image Unavailable, Please Login

 

HLA12065 @ Silverstone
Image Unavailable, Please Login

 

For a guy who thinks the FI is as good or better, you sure are spending a lot of time in the DD thread!

Who is not positive or neutral? FI owners?

As far as I'm concerned, DD owners are both positive and neutral (as are most FI owners), and the fact that they extol the benefits of practicality and benefits of the FI engine over & over, as do I, shows nothing but a positive & neutral approach. What more do you need?

I realize that by stating "certain influential people in this small community absolutely refuses to be positive and neutral", you are speaking about me. My response is - don't be silly! If something is a certain way, describing it as such does not belie being positive & neutral. In fact, if there is a lack of positive & neutral posts, you need look no further than your own posts about certain DD cars, including my own. If you don't have anything positive & neutral to say about DDs, stay off the DD thread, and avoid comments about the DD elsewhere too, after all, your FI is better and you'll avoid being bent-out-of-shape by reading about the DD.

There is a famous saying by a gentleman called William Shakespeare that is appropriate here: "Methinks Thou Doth Protest Too Much"

 

Do you make this stuff up as you go along?

I mean, really, what are your specific corroborating sources?

Can you name any specific factory references, produce any published works, post any technical illustrations or engineer-supplied DGM sheets?

Or are you just trolling?

 

That's a positive & neutral comment! Lets keep it that way!

 

A negative & biased comment, try being positive & neutral.

If you are making a thinly-veiled reference to this thread or myself, I can assure you that you are wholly incorrect.

Some reading who know this to be true, will likely not bother to dignify your erroneous post with a response.

 

JLA12399 recently, looking just like it did in the summer of 1988
Image Unavailable, Please Login

 

F 808 KEC is ZA9C005A0JLA12369, not first registered till December 30th 1988
Image Unavailable, Please Login

 

JLA12369 again, I think it's owned by an FChatter
Image Unavailable, Please Login

 

That stunning Paris-based Nero/Nero Downdraft again
Image Unavailable, Please Login

 

Yann, you are a man of impeccable taste.

 

Thank you!

If anything, from what we have seen of posts, Ellagurl is very biased against the DD, for some strange reason. Perhaps the DD is what he has really wanted all along, and it is a love-hate thing.

Jeez.

There is nothing that has been posted upon this thread that does not have solid corroborating material, with more to come, that might surprise some.

Ellagurl on the other hand typically provides us with rambling discourse with no basis-in-fact, punctuated by insulting other people's cars - as he did with the newly-upholstered seats of my DD - only to have to retract his position later when proven wrong.

I tend to take a different positive & neutral approach than Ellagurl's, especially when someone much more knowledgeable than I reveals what is special about something, I read, I learn, and I appreciate. I don't get all negative and biased, as the latter only underscores envy.

 

When you were buying your Fuel-injected Countach, if the Seller also had a Downdraft available in the exact same condition, with the exact same mileage, in the exact same same colors, for the exact same price, given that choice, which one would you have purchased?

BTW, no need to respond, that was just a rhetorical question, I know the answer.
Image Unavailable, Please Login