Weber 45 MCHH

[Telly]

So what's the scoop on the Weber 45 MCHH? Are they new on the market? Looks interesting and reasonably priced.

Any body try them yet?

Terry

'72 TR6

 

[DNK]

Interesting. Where are those weber experts on this???

 

[MadMarx]

they are MG carbs.
Weber used the normal DCOE housing but only one barrel works, the other oen is removed...

Were made from about 1975 onwards

 

[DNK]

The photos don't look like a DCOE with only 1 barrel. Looks to skinny

 

[MadMarx]

I have seen that carb on a MGB at the race track. Looked like a half DCOE to me.

 

[martx-5]

Here's some info from the Weber site.

One of the guys in our club works at a NAPA dealer and is selling them. He brought one in to a meeting a couple of months ago. It looks like a DCOE with one of the barrels (chokes) lopped off. They will basically replace a 1.75" SU or Stromberg. In the case of a dual carb setup, you would need two of them.

My personal take on SU's, Strombergs and Webers, is that if I had my choice for a stock or mildly modified engine, I'd stick with SU's...and if I had a TR6, I'd have three SU's on it and that would be enough fuel/air to support as much engine mods as I could stand without having a completly intractable car.

 

[DNK]

From the photo it looks like a DCOE body with the barrel in the middle.

 

[Monkeywrench]

SU's are a very capable carb. If I were going to make any modifications to an engine whatsoever, I would replace strombergs with a SU's. Mildly modified 1 3/4" carbs will and have supported 4cyl MG race motors with 200+hp (well depending on whose dyno you use /bcforum/images/%%GRAEMLIN_URL%%/whistle.gif ). They are also great on a "hot" street motor. A triple H6 set-up should be good for 290hp or so, all the while producing a ton of torque.

"My personal take on SU's, Strombergs and Webers, is that if I had my choice for a stock or mildly modified engine, I'd stick with SU's...and if I had a TR6, I'd have three SU's on it and that would be enough fuel/air to support as much engine mods as I could stand without having a completly intractable car"

Exactly! Just like any carb, set up correctly, they'll be great on the street.

 

[swift6]

Mildly modified 1 3/4" carbs will and have supported 4cyl MG race motors with 200+hp (well depending on whose dyno you use /bcforum/images/%%GRAEMLIN_URL%%/whistle.gif ). They are also great on a "hot" street motor. A triple H6 set-up should be good for 290hp or so, all the while producing a ton of torque.

Yeah, some EXTREMELY optimistic dynos.

 

[Monkeywrench]

Optimistic, sure.. but it's not far off

Also from some old carb literature, H(S)6's are quoted to be able to support aprox. 90hp with each carb.

 

[MadMarx]

The best English racing TR6 do have about 260 - 270 HP,

and the best MG's from Dutch do have 175 Hp.

 

[swift6]

The best English racing TR6 do have about 260 - 270 HP,

and the best MG's from Dutch do have 175 Hp.

Sure, but nowhere near streetable.

Back to the 45MCHH though, I also heard it was used/possibly originally produced for use on BIG V-Twins for the Harley crowd. Like this

 

[martx-5]

Yes, that was mentioned by the guy in our club who is selling those carbs. Funny thing, years ago a very popular replacement carb for the Harley crowd were the SU's. /bcforum/images/%%GRAEMLIN_URL%%/thumbsup.gif

 

[MadMarx]

Back to the 45MCHH though, I also heard it was used/possibly originally produced for use on BIG V-Twins for the Harley crowd. Like this

OCC?
Watch them sometimes on TV.