6 replies to this topic

[stretch tech]

hi all, i'm looking to upgrade my standard HS4 su carb (with stage one needle) on my mini thirty and i was just wandering what the benefits of a weber will be, more specifically a down draft (if it makes a difference) ? is it worth spending money on one and are there any down sides to them ? will a weber be better than a HS4 on a stage one inlet manifold ?

also, will a down draft weber fit under my bonnet or will i need a custom bonnet ?

Cheers

Rhys

Edited by stretch tech, 28 July 2012 - 09:01 AM.

[rids]

a well set up su is hard to beat

[coopdog]

as long as its jetted right it should be good,
im fitted one to mine after its jetted correctly

[bmcecosse]

Keep with the SU - Weber is a nightmare. Your engine needs head and cam changes to get more power - the carb is not the limiting factor.

[6joshh6]

Well the advantage of a Weber is slightly more hp but it won't be much if any improvement on a stage 1 998. Another great thing about Webers is the induction noise . However it means new manifolds and the carb itself is harder to set up. At the moment, if you're after power, I would be looking towards a better head and camshaft.

Edited by 6joshh6, 28 July 2012 - 10:02 AM.

[donjarr]

So years ago after reading Mr Vizards tuning bible I spotted the 48IDA, and in one of my mad moments bought and fitted one to my 1380 engine. The results were spectacular, as in floor the throttle and hold on for dear life as it went like a rocket, but the torque steer was immense, as in it was hard to keep it in the straight line on full throttle, (did make you grin though). The engine had far more low down torque, and yes it sounded great when you blipped the throttle.

The down side was a huge bulge on the bonnet to fit it under, fuel consumption on full throttle, well you could almost watch the needle moving, and being daft it did about 15 to the gallon, and I couldn't find anyone local with a rolling road that could set it up right low down, the firm I tried were suppose to be Weber specialists and just weren't is the best way to put it, and to run smoothly you needed to start the car ten minutes before leaving home for work so the engine could warm up and it worked fine.

All said and done it put the biggest smile on your face when you floored it, but at the end of the day travelling to work it just got to expensive in fuel, so swapped for a HIF44 which is not as much fun, but still does ok, and still have the weber in the loft just in case.

Prior to getting a new engine however I fitted a 32/34dmtl which I bought as a weber kit for the mini and was really please with that. I was more fuel efficient than the 1.5su it replaced but at the same time gave the car a bit more power, or at least it felt like it did. However it's not one of the more used carbs, but I was really pleased with it.

:)

[FerritZA]

As I said in my post, Vizzard's Tuning the A-series is a nice guide on getting the correct jets. Once its jets are correct, tuning is as simple as turning two screws: Idle and mixture.