The V8 Owners Forum -

Hi

Just a general inquiry for my interest, but can anyone tell me the performance benefits and fuel consumption difference between a set of Quad Webers and an Edelbrock 500 on a large Rover v8 engine in a Cobra replica or similar? Also I assume the Webers would be a nightmare to set up?

Thanks

Martin

martin_t wrote:Hi

Just a general inquiry for my interest, but can anyone tell me the performance benefits and fuel consumption difference between a set of Quad Webers and an Edelbrock 500 on a large Rover v8 engine in a Cobra replica or similar? Also I assume the Webers would be a nightmare to set up?

Thanks

Martin

I suspect that webers of the right size would give you a fair bit more BHP than a Eddy 500 but they will cost you a hell of a lot of money! Also every single time you want to make a jet change that's 8 jets that you need to buy.

Well setup webers will give you very good 'pick up' and a low steady idle once they are balanced. (That could be a nightmare too!)

According to Vizard a properly setup set of quads can give you good MPG.

Oh they look good and sound good!

(I don't know much about them but I believe that there are 'webers and 'webers' some are dodgy ones made aboard, also there are many flavours of them, you need to get the right ones if you want them to work properly)

martin_t wrote:Hi

Just a general inquiry for my interest, but can anyone tell me the performance benefits and fuel consumption difference between a set of Quad Webers and an Edelbrock 500 on a large Rover v8 engine in a Cobra replica or similar? Also I assume the Webers would be a nightmare to set up?

Thanks

Martin

Why not go for injection with a MegaSquirt? Will cost less than Webers and will give better economy. Easier to setup too.

sidecar wrote:

martin_t wrote:Hi

Just a general inquiry for my interest, but can anyone tell me the performance benefits and fuel consumption difference between a set of Quad Webers and an Edelbrock 500 on a large Rover v8 engine in a Cobra replica or similar? Also I assume the Webers would be a nightmare to set up?

Thanks

Martin

I suspect that webers of the right size would give you a fair bit more BHP than a Eddy 500 but they will cost you a hell of a lot of money! Also every single time you want to make a jet change that's 8 jets that you need to buy.

Well setup webers will give you very good 'pick up' and a low steady idle once they are balanced. (That could be a nightmare too!)

According to Vizard a properly setup set of quads can give you good MPG.

Oh they look good and sound good!

(I don't know much about them but I believe that there are 'webers and 'webers' some are dodgy ones made aboard, also there are many flavours of them, you need to get the right ones if you want them to work properly)

About £2000.00!!!

Martin

DaveEFI wrote:

martin_t wrote:Hi

Just a general inquiry for my interest, but can anyone tell me the performance benefits and fuel consumption difference between a set of Quad Webers and an Edelbrock 500 on a large Rover v8 engine in a Cobra replica or similar? Also I assume the Webers would be a nightmare to set up?

Thanks

Martin

Why not go for injection with a MegaSquirt? Will cost less than Webers and will give better economy. Easier to setup too.

Your right of course, but I'm old fashioned and like the look and sound of the Carbs!!

Martin

martin_t wrote:

sidecar wrote:

martin_t wrote:Hi

Just a general inquiry for my interest, but can anyone tell me the performance benefits and fuel consumption difference between a set of Quad Webers and an Edelbrock 500 on a large Rover v8 engine in a Cobra replica or similar? Also I assume the Webers would be a nightmare to set up?

Thanks

Martin

I suspect that webers of the right size would give you a fair bit more BHP than a Eddy 500 but they will cost you a hell of a lot of money! Also every single time you want to make a jet change that's 8 jets that you need to buy.

Well setup webers will give you very good 'pick up' and a low steady idle once they are balanced. (That could be a nightmare too!)

According to Vizard a properly setup set of quads can give you good MPG.

Oh they look good and sound good!

(I don't know much about them but I believe that there are 'webers and 'webers' some are dodgy ones made aboard, also there are many flavours of them, you need to get the right ones if you want them to work properly)

About £2000.00!!!

Martin

£2000 that's a good price!

A set of webers, manifold, linkage and a starting set of jets would be closer to £2600 Plus VAT

OK fuel consumption wise
GT40's running Holly carbs can get about 25mpg on a motorway run / speed (Ford 302)
Similar engined cars with Webers I've heard numbers of 9mpg and 16mpg

Of course different drivers and differnt amount of lead in the boots!

Ian

Ian Anderson wrote:

martin_t wrote:

sidecar wrote: I suspect that webers of the right size would give you a fair bit more BHP than a Eddy 500 but they will cost you a hell of a lot of money! Also every single time you want to make a jet change that's 8 jets that you need to buy.

Well setup webers will give you very good 'pick up' and a low steady idle once they are balanced. (That could be a nightmare too!)

According to Vizard a properly setup set of quads can give you good MPG.

Oh they look good and sound good!

(I don't know much about them but I believe that there are 'webers and 'webers' some are dodgy ones made aboard, also there are many flavours of them, you need to get the right ones if you want them to work properly)

About £2000.00!!!

Martin

£2000 that's a good price!

A set of webers, manifold, linkage and a starting set of jets would be closer to £2600 Plus VAT

OK fuel consumption wise
GT40's running Holly carbs can get about 25mpg on a motorway run / speed (Ford 302)
Similar engined cars with Webers I've heard numbers of 9mpg and 16mpg

Of course different drivers and differnt amount of lead in the boots!

Ian

According to Allan at Webcon..........£1995 + VAT (part No PRV401). Still bleeding expensive though!!!

Cheers

Martin

With regards to EFI, if it was a system using throttle bodies then that would be a good setup but if it was a system using a single throttle plate then the gains over a well setup carb will not be all that great. (Note 'well setup carb' and this is only my opinion!!!).

Martin, as you already have an induction system that will work on the 4.6 that you are planning to build you have to way up the cost per BHP that you will gain. I reckon that my Eddy 500 and Performer manifold are costing me 30 BHP over a set of throttle bodies and EFI or even a set of Webers, if either of them cost 2000 quid to set up that would be 66 quid for every BHP (Ok you could sell the old system but even so...)

I've had some email chat with a nice guy on this forum, he has tried a couple of manifolds and has found that a 360 degree one that he had gave around 20 BHP more than the Performer but with a loss of low down BHP. Its all swings and roundabouts, how much BHP do you want and how much do you want to spend? Your current system will work on a 300 BHP motor so you might be better off spending the money elsewhere. If on the other hand money is no object and you absolutley must squeeze every BHP out then spend the money! (Even then if you add 2k to the cost of the short engine that you need to buy you might be able to buy a 5.0 litre lump, that might give you more than 30 BHP more with a big lump of low down torque)

sidecar wrote:With regards to EFI, if it was a system using throttle bodies then that would be a good setup but if it was a system using a single throttle plate then the gains over a well setup carb will not be all that great. (Note 'well setup carb' and this is only my opinion!!!).

Martin, as you already have an induction system that will work on the 4.6 that you are planning to build you have to way up the cost per BHP that you will gain. I reckon that my Eddy 500 and Performer manifold are costing me 30 BHP over a set of throttle bodies and EFI or even a set of Webers, if either of them cost 2000 quid to set up that would be 66 quid for every BHP (Ok you could sell the old system but even so...)

I've had some email chat with a nice guy on this forum, he has tried a couple of manifolds and has found that a 360 degree one that he had gave around 20 BHP more than the Performer but with a loss of low down BHP. Its all swings and roundabouts, how much BHP do you want and how much do you want to spend? Your current system will work on a 300 BHP motor so you might be better off spending the money elsewhere. If on the other hand money is no object and you absolutley must squeeze every BHP out then spend the money! (Even then if you add 2k to the cost of the short engine that you need to buy you might be able to buy a 5.0 litre lump, that might give you more than 30 BHP more with a big lump of low down torque)

Hi Pete

I'm with you on this obviously. I havn't got limitless funds and the Quad's are silly money (and probably silly mpg as I do a lot of driving in the Cobra). It's really more interest (and I may win the lottery!!!). They do look and sound fabulous though!!

Martin

There's no substitute for the sound of quad Webers but you'll need to balance them every year. Once you know how to balance its easy peasy. ( teaching my wife now how too, so she can doing here tripple carb'd 3.0 Essex herself.)
Its like driving a motor bike. You have to balance their carb's every year too.

Fuel consumption depends on your right foot. Once correctly jetted ( on the rollers ) they will run like a normal singel carb.

Our tripple carb'd 3.0 does the same consumption as a single carb'd 3.0 but if you go all out pedal to the metal all day it deffo consumes more.

Real bhp bennefit over a single Eddy 500, not real unless you have an all out race engine hitting 7000+ bhp all times.
Single Eddy 500 once jetted correctly is no worries or looking after for years.
I personaly won't ever use an Eddy and go for an Holley instead but that personal.

you mean like this



They ROCK. Pickup against an Edelbrock is awesome, fuel consumption is worse but that's mainly the joy of pushing my foot to the floor

Where's the "like" button when you need it!!!

However, which look better- quad DCOE's or quad IDA's??!!

I have an IDA fanimold and access to a set of IDAs BUT these allow the car to look somewhat standard

I'm thinking of renaming the car to 'GOODBYE Mr. PORSCHE!'

Mr Mole I do like that setup you are running!

But to get a bit better breathing take off those mesh filters and fit some that are full hemispheres (not flat topped)

The hemisphere ones do not actually restrict but those do - work out the surface area of a hemisphere and compare to the area of a circle of same diameter - huge difference! (P1 R squared compared to 4/3Pi r cubed)

Ian

Mr. Anderson,

The mesh filters are there for he same reason as tennis balls on IDAs. They stop little people with inquisitive fingers from pushing sweets, biscuits or small toys into the induction system. They were sold to me as 'no reduction in breathing' but the vendor lied as the rolling road confirmed they lose 5bhp at the top end.

Another Ian