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Enjoy.
This car was simple and reliable. A 32/36 or strombergs would probably have drowned the engine. Me and my Anglia in my senior year of school way back in 1967. It had a 997 cc engine.I know there are a lot of fans of the Weber DGV. It's simple and reliable. .
Jeff,
If by flow you mean cfm... That will be determined by the throat and chocke size. If you have a dvg/dga/dgf etc with larger throats than the stock twin carbs (zenith wip/wia or strom 150cd) then the compound will flow more.
If you mean that 2 carbs offer better more direct flow due to manifold design... Tgat depends on the compound manifold.
The 2 true advantages of the single weber are
1. it wont go out of sync like s twin setup can, the convenience advantage.
2. If you have it set up as stock progressive it saves fuel as the second throat opens up at higher rpm where a twin setup always opens both throats. Though you can add a sync link so both throats always open for more performance.
All that said... I love twin carbs, for look alone and performance.. Hence i have twin 40 dcoe :-D
In my family we have Alpines running on both the latest Weber DGV with the free flow induction manifold developed by the U.K. owners club and marketed by Alpine Innovations and the standard (fully reconditioned) Strombergs. There is absolutely no comparison. The Weber set up is smoother throughout the rev range, more powerful, stays in tune and is literally a fit and forget option. With the Stroms you need to balance them fairly regularly, the dashpots need topping up, the diaphragms can split (which is a real pain if you happen to be away on trip when it happens!) and the T pieces can break.
If you fit a Weber and a good quality electronic ignition you have made the car significantly more reliable and much more like a 'modern' car to live with.
Tim R
I think Tim hit the nail on the head. There's an old saying that goes back many decades about owning a British car. "Drive it during the week and work on it during the weekend". These are old cars and unless you have nothing else to do but fiddle with the car on a constant basis then don't upgrade to items that simplify life with the car. The Weber is one of those upgrades that keeps it simple and on the road.
Tim, your experience and insight is very helpful! How does the throttle response of the Weber compare to the dual Strombergs? I've always wondered if the dual carbs would feel more "snappy" since both throats open at once.
Mightyohm,
Some people in the UK are now ditching their twin DCOEs for the new twin choke single carb set up because of the the advantages that make it so much easier to live with.
Tim R
Jeff,
Holley considerers the Holley 5200 series of carbs to be rated 270 CFM @ 3.0 inches of Mercury. The 5200 is the Holley copy of the Weber DGF made for emissions controls (used on Pintos and Vegas, etc.). I think if the 5200 was rated the same as a four barrel at 1.5 inches of Mercury, then it would only be considered to flow about 190 CFM.
I'm not sure that I have ever seen a flow rating on the Zenith-Stromberg carbs. Considering the variable venturi design, flow would be dependent on the parts assembled in the carb. A stronger piston return spring could reduce venturi opening enough to change the flow rating. A stronger return spring would also require a different profile needle.
For what it is worth, the Alpine's 1725 used a pair of CD150's compared to Triumph's TR-4 using a pair of CD175's on its 2200 cc engine. Less than half of a liter displacement required the use of a larger pair of carbs. IIRC, the 150 and 175 refers to the size of the throttle bore at the rear of the carb in inches.
HTH
I see you had to ditch the stabilizer bar on side with the carbs to make it all fit!
That is a slick throttle linkage setup, is it custom?
things interesting.
Pcd is wheel stud spacing, pcv is for the crack case ventilation (the pcv valve achieves this)I thought it was PCD! I'll say PCV in future. The Series IV belongs to my eldest. My youngest has a Series V as do I. They bought their cars when they were 13 years old and spent the next 4 years doing them up so that they had nice cars to drive when they were old enough. They are both in their late 20s now and their cars are still lovely.
Tim R