I'm considering a dual-carb conversion for my '79 B, and I was wondering: Which type of carb is better, SU or HIF? Or is there much of a difference? -- Keith G. 1979 B
I went HIF. They are more complex, and possibly more expensive, but they work pretty well once you get everything set up. The true PITA (and I have experienced this) is that because the float bowl is
HIF is a variety of SU - it replaced the HS models. HIF stands for Horizontal Integrated Float - it means that the float chamber is built into the base of the carb rather than being separate (so it's
I cannot compare SU or HIF's because HIF's is a type of SU carb. I think you mean HIF's vs HS4's. All I can say is that I changed out the ZS carb from my 76 to HIF's and a friend described the chang
Howdy All, If Keith to going to fit SUs on his 79 B, would he not have to use the HIF, because the float assembly on the HS would interfere with the brake vacuum booster? Perhaps others can check my
No problem with the float bowls. The air filters are the only issue. My personal preference are the HS carbs, as I have had problems getting a stable idle with the HIF ones. Both designs are quite wo
I've been told several times that I should do the conversion on my '77. Based on what I've seen at http://www.chicagolandmgclub.com/photos/carbswap04/ it is doable, but it is best to be prepared for
Nope, HS4's fit fine in my '79. One thing though...the stock air cleaners won't fit due to the brake booster. Some prefer the tapered K&N's. Others use the foam half-moon style or the pancake type. M
No, that doesn't get in the way. If you don't shim the motor mounts to lean the engine over a bit, the airfilter (foam half sphere type) will interfere. You can either dent in one of them so it fits,
It's truly easy. The biggest things to have to worry about are sticky pistons, leaky throttle shafts and frozen bolts on the manifold. -- Paul Root "Few people know what to do when hula girls attack.
OK, the list has checked my memory. What can I say but middle age. Another thought. What kind of distributor is Keith going to use? Does he need manifold or ported vacuum? The original US 1979 used m
The manifolds are pretty much interchangable. If he needs a port from the manifold, then screw one in, otherwise, a plug. Exhaust manifolds aren't available new, but are pretty plentiful on eBay. Oth
I have HIFs on my 74 and HS on my 77. Either is fine for your application. You'll need MGB dual carb intake and exhaust manifolds. IMHO you want to go to a late 60's distributor (41491 ?) and run man
I went with the HIF swap on my 1980 MGB. I've replaced the distributor with one from Brit-Tek (in their "Ultimate Ignition Kit" - http://www.brittek.com/ultimateignitionkit.html), which uses manifold
The two are completely interchangeable - given the port on the rear carb, and any distributor can use either carb or manifold vacuum. UK spec cars used the same 45D distributor from 1974 onwards even
Uh, it might be the 25D model, now that I think about it following a reminder from a friend. Good point. With the older distributor and coil, I'm getting better gas mileage than I've ever gotten with