This looks interesting (for 1900s and 102s)

[twoliterlover]

Quote:

Originally Posted by tubut Since this is supposedly a racing manifold, I'm guessing that this port is for a vacuum brake servo (not introduced in 102 production models but probably a good addition for race cars). Looking at the 102 parts catalog, I saw that the standard intake manifold had 2 ports for radiator coolant (front and back) that this racing manifold doesn't seem to have. I always thought temperature management of the intake manifold was necessary so that the mixture wouldn't change. I can only imagine that racing engines run in such narrow temperature bands and are adjusted often enough that temperature management of the intake manifold is not necessary. But for a street engine, the story is probably quite different.

[2000 touring sp]

I am going to bay one of these manifolds at OKP in W14. Before mounting it, I will like to have it painted. On Ferrari the valve cover is painted with this special read collar. also seen on the cover of some Alfas .I will like to have that surface of the paint only in black.
Does anybody know what type of paint that is used.
attach picture of a 1900 sprint engine, witch I my opinion do look very nice.

[Alleggerita]

The type of paint is "crackle" or FWIW "Schrumpflack" in German. It is available in a spray can or as powdercoating.

If you use a spray can using it on a warm sunny day outside is usually enough to get the crackle effect or alternatively you can use a hair dryer or heat gun.

[twoliterlover]

Information as to krinkle finish and using sun's heat or heat gun (watch out you don't get too hot) is absolutely correct. Spray can is easiiest. However, on two liter there should be that same black krinkle finish on the head, not like this 1900 which is wrongly still bare aluminum, and the spark plug connectors are too modern. May run very nice (even, frankly, looks very nice since it is clean) but not as authentic as it could be. JAY

[Alex]

There is a super-expensive (about $40 a can) black/red wrinkle paint available from here, claimed to be superior to any other. Can only suggest you send them an email as my own brief search just now didn't find anything, but I know it's there ....

Alex.

[gxg95]

After studying this thread and the many others on this BB, the excellent technical advice and expertise available convinced me to bite the bullet and swap out my Solexes for pair of 40DCOEs on my 102.. I picked up one of the Conrero manifolds from OKP rather than modify the existing manifold. My rationale was I can preserve the ability, at least in theory, of going back to the original configuration.

But, a bit of a warning (perhaps) to those of you who either have bought or plan to get the Conrero manifold – the manifold causes the Webers to sit at a little bit of an angle (see photo). I don’t know enough about Webers to know if this is a major or minor problem. Perhaps someone with experience with Webers can tell me.

The switchout was pretty straightforward and uneventful. Due to some mismatch between the length of two of the studs and the bosses on the manifold I could not get two of the nuts on, so I milled the two mounting points down slightly to match the stud length (there was no way I going to get the studs out of the head). I stubbed out the extra cooling lines on both sides of the manifold. It started right up and idled and ran pretty well with the factory settings. Of course, I fooled around with things per the supplier’s instructions (idle mixture, etc.) but I can’t say I improved it at all.

My first drive was just a few minutes ago. It runs really smoothly and well, although I haven’t really pushed it hard as I don’t yet have the air cleaners on (using the horns for the synchronizer tool is just too convenient). Jay is right of course – the sound of the Webers with the bare horns is a bit too much. I plan on making the adapters for the airbox; hopefully that will reduce the noise.

I don’t think I will miss the intense gas smell in the garage that used to follow every drive...

So far so good.

[twoliterlover]

Far better the angle they sit than hanging down which might allow the floats to seal off the gas input -- especially on hard left hand turns -- and make for a shortage of gas. floats on webers do shut off flow good so you won't flush raw gas out the ends. Have you worked out the dimensions for the carburetor support arm that fits onto the plate on top of the right motor mount so that the weight of the carburetors does not tear out the rubber mounts between carburetor and intake manifold. Looks very nice otherwise. By the way, Weber does have a stock "T" to attach onto the bango fitting of the front carburetor so as to run a single gas line instead of the two lines from the fitting you put into the line just after the fuel filter. But you can modify that any time and enjoy driving it until you get the "T". Nice krinkle finish on engine, by the way! Isn't is nice not have the terrible raw gas smell. Conrero intake manifold is not cheap, however. Nice thing about it is that someone else might covet it after a while so you could could sell it without loss and still get a cheaper manifold and cold air box from me. I guess I need to put some photos of my carburetors with revamped intake manifold and air box on bb. Allows the carburetors lie flat so it seems to have come that way (and the water jacket remains intact). I ought to have you get used to your conrero first and then try mine so you can check the differences in performance. There is a guy in Brazil who wants you intake manifold, solex carbs and cold air box, by the way. Jay

[tubut]

FYI: Weber Carb Angle shown on p.127 of the 1988 HP book "Weber Carburetors"' by Pat Braden:

[gxg95]

Ruedi: I knew could count on you guys to help me recover from my chronic ignorance. Thanks for posting the drawing - I'm pretty sure that is the angle I have now.

Jay - thanks for the tip about the Weber tee. I couldn't find that particular fitting posted on the site from where I purchased the carbs, but I have since tracked down the Weber part number at other sources. It will certainly clean up the installation. Next on my list is the outer support arm. I'll have to fabricate something to pick up the screws on the bottom of the carbs - the installation shown on the drawing Ruedi posted would interfere with the mounting of the air filters, although it would work great with the horns.

Thanks for all the great advice.

[2000 touring sp]

Then the OKP/Conrero manifold is mounted, and its a huge difference. The figures is tested on the rear wheel by a Bosch Optima 7,14
The output compared to Solex by 4500RPM increased from 65HP to 75HP
Toque increased at Solex 2600rpm 109NM 4500rpm 95NM
Weber 2600RPM 125Nm 4500RPM 110NM
I attach the curves there is app 10000 km on the engine between the first test by Solex to the present one With OKP/Conrero Weber manifold. The compression figure is as the Solex done in 2004

[2600]

My Lotus ran with two 40's on an unheated manifold, the 2600 had three 40's and was heated, it really didn't seem to matter on the track. My Fiat 131S has heat and is an absolute PIG in Winter untill it warms up. Incidently I Rallied the Lotus, in Winter through Alberta and Saskatchewan, never had a start or run problem.Adrian

[2600]

2000 Touring,
I use a product called VHT which is a PJI product. It's made for engine components and is heat resistant and available in different colours.
Manufactured for PJH BRANDS, Scottsdale,AZ 85258 USA.
It's VERY SLOW drying, but, if applied correctly gives great results.
Adrian

[schaapm]

I have been in contact with the person who has produced the intake manifold and he is interested in reproducing the Weber intake manifold. The only problem is I do not have an original one.....
If there are people interested in a manifold, he is willing to reproduce them with a minimum of 10 pieces. He could not give me an estimate on the costs, but with some good pictures he could give me a rough forecast of the price.

Anyone???

[67alloy]

Hi Marcel,
Are you speaking of the 2600 Weber manifold? And are you refering to Christian at OK Parts?

Is he now willing to go forward with this project immediately or are we still in the exploration phase?

The U.K. club has a manifold that can be mapped digitally and provided to Christian, but the original manifold cannot be loaned out.

Regards, Wm. Hall

[twoliterlover]

Pat Braden was NOT a two liter or 2600 man as much as he was the knowledgeable guru of the ordinary and normal 1750, 2000 etc. He really knew a lot less (possibly very little) about the larger cars, and overstated the information on the uptilt on the end of the carburetors for weber installation. On the smaller four bangers he was right. Their motors are motor is deliberately mounted in the car slightly tilted down on the intake side because of the motor mounts specifically of different dimension on either side. The regular intake manifold is tipped up no matter what type, and webers no exception, and that makes the float level correct in the carburetor. Thus the drawing is okay for them. That 5 degrees is about right.

BUT ON A TWO LITER OR 2600 THE MOUNTS ARE IDENTICAL on either side and the engine sits straight up with its top horizontal. With an intake manifold tipped up 5 degrees there is NO way to put the cold air box on a two liter. If you have the conrero type intake manifold from OK Parts, you have already discovered that. And, frankly, I suspect the carburetor bowls are tilted. So, full speed ahead in getting copies of the 2600 monifold drawings to Christian. Maybe he will rework a two liter intake manifold too without the uptilt and the possibility of fitting the cold air box with regular filers. There is a bit of beauty in staying a bit close to originality.

BUT HERE IS AN ANNOUNCEMENT. I have just had spacers manufactured to go between the outside end of weber carb and the cold air box to allow all to be bolted together and the regual air box used. Unfortunately, it would not work with Conrero type that tilts the carbs up at that uneven angle. That is why my practice is to put separators in the original solex configured intake manifold. Perhaps I might be able to later run some data on those. They certainly do look a lot better with the original cold air box and filters, and I I do know two liter spiders run fantastically better with webers than they do with solex. I just don't know yet how much better.

Jay