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Old 20th March 2015, 00:49   #31
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Default Re: DIY - Cosworth Cold Air Intake install

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Originally Posted by Jeroen View Post
No, that is not correct. When You press the accelerator you open the butterfly but you also, on most car engine carburetor inject (pump) extra fuel in. So next to what the Venturi draws, additional fuel is mechanically entered into the mixture. Thats why the mixture goes rich, not lean. Trying to accelerate with a lean mixture tends to be not so successful!
Jeroen
Thats true for Carb's with an accelerating pump. I was referring to one without.
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Old 20th March 2015, 03:32   #32
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Thats true for Carb's with an accelerating pump. I was referring to one without.

I have been working on cars all my life. I have owned dozens and dozens of carburetor car and even today own a couple of classic car with carburetor. I dont think i have come across a carburetor on car that doesn't have some mechanism to pump extra fuel into the engine when accelerating. By the way it also the exact same principle/mechanism that primes the carburator prior to starting the engine.

http://en.m.wikipedia.org/wiki/Carburetor

Jeroen
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Old 20th March 2015, 11:27   #33
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Default Re: DIY - Cosworth Cold Air Intake install

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Originally Posted by Jeroen View Post
I have been working on cars all my life. I have owned dozens and dozens of carburetor car and even today own a couple of classic car with carburetor. I dont think i have come across a carburetor on car that doesn't have some mechanism to pump extra fuel into the engine when accelerating. By the way it also the exact same principle/mechanism that primes the carburator prior to starting the engine.

http://en.m.wikipedia.org/wiki/Carburetor

Jeroen

Where did I even mention that the carburettor does not have an arrangement for extra fuel during power operation.

What is the argument here?

I guess, the discussion point was, if the Accelerator of a carb'd car is connected directly to anything else other than the throttle plate? I only said it is not (apart from vehicles with accelerating pump and that too in certain cases)

Fuelling is mainly controlled through the suction created by the expanding air, or the engine. The accelerator cable doesn't (Accelerating pump case to be taken as an exception)

For the sake of simplicity and to avoid discussing something in detail which is irrelevant in this thread, I was taking the example of a simple downdraft carb.



From the same Wiki post that you have posted.

DIY - Cosworth Cold Air Intake install-untitled.jpg
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Old 20th March 2015, 18:46   #34
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Default Re: DIY - Cosworth Cold Air Intake install

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Originally Posted by Jeroen View Post
I dont think i have come across a carburetor on car that doesn't have some mechanism to pump extra fuel into the engine when accelerating.
I have (and am not talking of Amals and Bings). And am sure so has Anirban considering that (in India) his favourite car came with two carb setups (both Solex M32PBIC), one of which did not have an accelerator pump.

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Sutripta
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Old 20th March 2015, 18:58   #35
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Originally Posted by 1100D View Post
Where did I even mention that the carburettor does not have an arrangement for extra fuel during power operation.



What is the argument here?



H]

No argument, obviously you have great general insights in carburetor and you have that great ability to simplify things. Kudo's to you to come up with these general simplifications.

When it comes to technical stuff i am pretty anal and I like detail and in my experience have rarely come across car engine carburetors without some acceleration mechanism. So a generalization or simplification that doesn't mention it, is not correct in my opinion. Maybe cars in India are different. The carburetor on my 1975 Royal Enfield Bullet is at least a lot simpler then what I typically have on my classic cars.

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Old 20th March 2015, 19:04   #36
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Originally Posted by Sutripta View Post
I have (and am not talking of Amals and Bings). And am sure so has Anirban considering that (in India) his favourite car came with two carb setups (both Solex M32PBIC), one of which did not have an accelerator pump.



Regards

Sutripta

Trust you to come up with this! i understand you are referring to a dual carb set up, with only one of them having an accelerator pump? I guess technically you are correct in claiming to know an eng carb without accelerator pump. However, that car would not be going anywhere if the other carb did not have one!

Why this set up? Was it a cost issue, or is there a technical reason. I would have thought it might make tuning a little easier if both carbs are identical? Truth is, multi carb engines tend to be a royal pita even when the carb are identical, let alone when they start to differ.

Jeroen
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Old 20th March 2015, 19:22   #37
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Default Re: DIY - Cosworth Cold Air Intake install

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Originally Posted by Jeroen View Post
i understand you are referring to a dual carb set up, with only one of them having an accelerator pump?
Actually no.

The Fiat 1100D/ Premier Padmini came with a number of carb setups for essentially the same carb (all of India used the same carb, a Solex design made under license by Ucal. Results of our import substitution policy in the not so distant past.) There was a setup with a 20.5 mm venturi, which did not have an accelerator pump (a plastic plate was fitted where the pump otherwise would have been) and a 22 mm venturi setup which did have an accelerator pump.

Am sure the discussion can be carried forward by the (very passionate) Fiat fans on this forum.

SUs, by their very nature did not have an accelerator pump. And no matter what SU claimed, the dashpot was for psychological purposes only!

Note for others: Ever wonder why on bikes one is supposed to roll open the throttle, not snap it open?

Regards
Sutripta

PS. Talking of strange setups, I once had a Dell Orto twin barrel (similar to the more common DCOEs) which had idling control on only one barrel!
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Old 2nd December 2015, 11:37   #38
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Default Re: DIY - Cosworth Cold Air Intake install

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Originally Posted by svsantosh View Post
one needs to capture the source either through the slats or point to the ground (in case a large IC+plumbing blocks the way).
Working on that santosh. I was thinking of a hood scoop, just over the conical filter. But then in rainy season, there are chances of water getting in through the same. So the thought on hold.

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Originally Posted by tharian View Post
Just to confirm the OBD2 scanner can be used as a basic test to confirm if the CAI actually makes any difference, I had tried it out few months ago on a stock Figo (2014) and mine (2010).
Have called for it, the HEX+CAN+USB cable. Will upload the results as soon as i do some more tweaks.
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