praveshb

quadrajet vs tdi

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Hi,

People in various auto magazines have given excellent review of Indica Vista. However, all of them focus on the positives of the new quadrajet engine. I wish to know the difference between TDI and quadrajet and why is the latter better than the former.

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tata's tdi is completely useless engine which sounds like a tractor engine and that's why they took fiat's mjd because this is how only they can make indica a premium hatchback which couldnt have been possible with the horrible tdi engine !!!!

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no not at all....accent had the crdi engine of hyundai !!! in all these diesel engines there's the difference between the level of pressure in which diesel is injected and the rate of compression...too technical for me to explain !!!!

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From what i know, TDi is turbocharged engine and CRDi/CRDe/DiCOR are common rail direction engines... the two cannot be compared (DiCOR is a newer technology as compared to TDi)

Regarding, fiat and tata engine, the fiat engine is more refined to give lower NVH and whereas the engines in the Tata vehicles arent as refined.

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TDi stands for Turbo Direct Injection and is NOT common rail. A common rail design has multiple injections  (up to 5) per stroke, amongst other things. The critical one for the knock reduction is the pre-injection of about 1cu mm of fuel (pioneered by FIAT). This ignites and the shock wave damps out the main shock wave from the power injection(s).

CRDi, CRDe, DICOR, Multijet, Quadrajet, etc. are all proprietary names for the same thing - Common Rail Direct Injection Engine.

The only competing technology is Pump Duse from VW which uses individual high pressure pumps for each cylinder. This is being withdrawn from small (read car) engines since VW finds developing it further all by itself is not worthwhile. A PD design I think tops out at 3 injections per stroke. Thus PD will only be seem in Trucks and the like in future. Also. CR technology can work at a higher line pressure than PD. A higher line pressure means a shorter injection stroke for the same amount of fuel. 

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Quadrajet/Multijet/Dicor/CRDI/CRDE - they all are direct injection engines but names are different depending on the companies. this technology is miles ahead of the old TDI engines and a Direct Injected engine is far refined and less polluting than TDI along with being more performance oriented.

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Quadrajet/Multijet/Dicor/CRDI/CRDE - they all are direct injection engines but names are different depending on the companies. this technology is miles ahead of the old TDI engines and a Direct Injected engine is far refined and less polluting than TDI along with being more performance oriented.

I suggest you try to make some sense out of what you are saying so that readers are not completely confused. From the days before common rail and turbo charging, i.e. from the time Rudolf Diesel worked on an engine without carburettor (where fuel is mixed with air before injecting into the cylinder through intake valve) way back in 1892, it has always been direct injection. So, please don't talk as if direct injection is something new. Diesel engine has always been direct injection. What is new is the common rail, which you can read from many sources. http://en.wikipedia.org/wiki/Common_rail will be a good start.

Direct injection in petrol is a different story altogether.

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Originally posted sjiitk

CRDi, CRDe, DICOR, Multijet, Quadrajet, etc. are all proprietary names for the same thing - Common Rail Direct Injection Engine.

 

 

 

TATA is already using DICOR in all their cars/suv. How the dicor & Quadrajet different?

 

Regarding Pump Dues, SKODA LAURA is using it.

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Originally posted sjiitk

CRDi' date=' CRDe, DICOR, Multijet, Quadrajet, etc. are all proprietary names for the same thing - Common Rail Direct Injection Engine.

 

 

 

TATA is already using DICOR in all their cars/suv. How the dicor & Quadrajet different?

 

Regarding Pump Dues, SKODA LAURA is using it.

[/quote']

The basic technology in both is same. Names are different because of copyrights. The reason FIAT engine is supposed to be better is because of the refinement levels in the engines (as mentioned in one of the previous posts). The FIATs have one the best engines in this category (and so is being used by everyone) which essentially means they are more refined leading to less NVH and better response.

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Originally posted sjiitk

CRDi' date=' CRDe, DICOR, Multijet, Quadrajet, etc. are all proprietary names for the same thing - Common Rail Direct Injection Engine.

 

 

 

TATA is already using DICOR in all their cars/suv. How the dicor & Quadrajet different?

 

Regarding Pump Dues, SKODA LAURA is using it.

[/quote']

The basic technology in both is same. Names are different because of copyrights. The reason FIAT engine is supposed to be better is because of the refinement levels in the engines (as mentioned in one of the previous posts). The FIATs have one the best engines in this category (and so is being used by everyone) which essentially means they are more refined leading to less NVH and better response.

true tha Multijet is much more refined..

but then i dont think that DICOR is as same as CRDI of Hyundai, Tdci of Ford, Tcdi of Chevy, etc...

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