L-18 Carburetor questions.

[Tigerbomb]

Hey guys. I am currently going to have my L-18 rebuilt. As car as Carburetors go, i see a few options as far as SU Carbs, Mikuni Carbs and OEC Carbs. I've never gotten a straight answer around my parts or nobody knows what they are, can you guys break down the difference for me please? Thanks a bunch for the help guys. 

[ggzilla]

SUs are one-barrel carbs. Typically two are fitted

 

Mikuni-Solex PHH, Weber DCOE and Dellorto DHLA are basically the same - your typical racing carbs, two-barrels and usually two fitted. OER are a newer version of them. They all use the same manifolds.

[datzenmike]

...and all feed air into the head from the side. The stock Hitachi carbs that came on the L18 feeds down into the manifold then the flow turns 90 and enters the head from the side. A 'side draft' carb gains a slight edge over a 'down draft' by making it easier for the air to flow in a straighter line into the head. Side draft carbs can take up a lot of space though.

[Tigerbomb]

So what would be the benifits of having 40mm, 45mm or 47mm OER DCOE? Airspeed and Torque correct? I'm looking to see which i should end up buying as well as a decent manifold. I wanna have this build done correctly. 

 

Thank you Mike and ggzilla for the info so far. 

[ggzilla]

40s are good for up to 180 HP.

 

45s are needed beyond that

[Tigerbomb]

Last question. For a intake manifolds for a 4 cylendar for a OER Carb. I was told i can find them online pretty easily and i've searched these forums and google as well and i'm finding nothing. Do you have any information regarding those? 

[ggzilla]

Mikuni-Solex PHH, Weber DCOE and Dellorto DHLA [and] OER ... all use the same manifolds.

[Tigerbomb]

Thanks for the info guys. I really appreciate it.