whats needed to make a carb accept boost pressure? Weber carb.
skin1235,
Feb 25, 7:06am
a lot of serious work,and some serious pumping easier to fit injectors
skin1235,
Feb 25, 7:07am
the whole principal of a carb is the differential between the low pressure in the manifold and higher pressure ambient air, by blowing the carb you equalise or diminish that differential = carb don't work as well
m16d,
Feb 25, 7:16am
Yer. a carb need some suck to get the gas up. Why don't you make it a suck through carb system.
ocean_x,
Feb 25, 7:23am
customer wants to do something alittle differant, which I personaly think is quite cool. my suggestion was also a suck through carb setup,
I understand how a carb works and have seen blow through setups work well in SOME applications,
Thought it would be a good learning curb to try a blow through setup though, any suggestions on how to go about this? (Without buying a blow through car) just adapting a regular webber
ocean_x,
Feb 25, 7:24am
Going to injection is not an option, he wants carb turbo to be differant
skin1235,
Feb 25, 7:31am
can't see how a webber would do it, they rely on the differential to lift the fuel up the discharge tube, and thats drawn by the volume of air passing through the horn, pressurise the manifold and the flow through the horn diminishes, the fuel will not enter the discharge tube as well if at all
intrade,
Feb 25, 7:43am
ok you need a old lancer turbo then i think and i am not 100% but they where carb turbos. there is huge problems with doing it this way but thats what you will need to study how they done it. i could be wrong on this as i was not remotly interested in turbo petrol when they where new in the early 80s
ocean_x,
Feb 25, 7:53am
Brilliant idea regarding the lancer turbo, will look into that, cheers mate
mechnificent,
Feb 25, 8:02am
You can't put hot turbo air through a carby. You have to use a supercharger. If suck fuel and air into a turbo it's likely going to ignite in the inlet manifold.
If you want to blow through a carby with a blower you should read up on airplane carbies.
mechnificent,
Feb 25, 8:05am
You need to pressurise the float chamber and have various ways to enrichen the mixture with boost. On airplane carbies they use diaphrams or plungers or sealed concertina boost enricheners.
trouser,
Feb 25, 8:07am
One really budget way to do it is to put a sealed box around the carb and supply boost pressure to it. Otherwise you need to get boost pressure to all the atmospheric ports on the carb. Could be easy or a pain depending on design.
mechnificent,
Feb 25, 8:09am
You should be able to get either a training manual or a service manual for aircraft carbies. It's a very specialised branch of aviation mechanicing. There will be general books, and books on specific carbs.
mechnificent,
Feb 25, 8:10am
Just get a carby off a plane and stick that on. they are very nicely made.
mechnificent,
Feb 25, 8:13am
They did do that. but it's a shit to work on, and if it's turbo heated air. it's too hot.
ocean_x,
Feb 25, 8:14am
people have run blow through carb setups with turbos overseas. Not so comman, but it is possible.
On a suck through turbo, it's rather common. The fuel will not ignite in the intake manifold if it's done correctly.
Can't is just another word for it's going to be a challenge.
Cheers
ocean_x,
Feb 25, 8:15am
Will look into aircraft carbs. Thanks
snoopy221,
Feb 25, 8:20am
Keerist what am i reading here? Who is this good blowie and where does she hail from? Is she a turbo or a supercharger? Alas . we know not However ole skinners union ya know suck it up and deal wiff it-swallow? S U carbs can handle a blowie K-and he wantzzz unique? Technically more information required.
snoopy221,
Feb 25, 8:21am
Mind you injection is a good squirt and a good squirter wiff a blowie can be damn tmptn. LOL
bigmacca,
Feb 25, 8:37am
the lancia delta hf turbo uses a weber carb using blow thru. all intercooled , runs bloody well for a little 1600cc. very well set up from factory.
esprit,
Feb 25, 8:43am
Lotus Esprit Turbos used blow-through Dell'orto carbs back in the '80s and early '90s. Worked pretty well!
I also used a turbo and carb off a Renault , think it was 1600cc. it was used to turbo a ford escort 1300. ran 7psi , started first pop and transformed the escort engine into something fairly fast. However I cant remember the carb make however it was a blow thru carb .
ocean_x,
Feb 25, 9:07am
Thanks heaps, thats what I like to hear. Great options/info. This will be going onto a 1500cc cortina L block engine, in a 105e anglia. only aiming for 6psi max.
bigmacca,
Feb 25, 9:11am
a mate may have a spare turbo weber but im sure its still attached to the motor and they are getting hard to find now but could ask him. carteronis who are friends of mine would be able to track one down. contact them via the lancia 037 ad that they have on here.
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