engine and drivetrain Too much carb?

[Layne Tierney]

I recently bought a set of solex 48 carbs from some crazy german dude that had them on a "built" m10. Im on a low budget (in high school) and I'm not sure if my stock Cam is gonna let the carbs work properly. if someone could please give me some input in how to tune the carbs or on what to do to prepare the engine for the extra horses it would help a lot. 

[Preyupy]

48mm carbs on a stock engine is not going to work very well.  With a lot of work (smaller chokes and venturies) and a ton of time trying different jetting you might get them to work almost as well as a 32/36 DGV.  It's not just the cam but compression ratio, porting, valve size, header, exhaust system etc to even come close to needing a set of 48mm carbs. 

[Layne Tierney]

Thanks for the input!! 

[Simeon]

They will make great talking points on the shelf until you have built an engine that needs that much air. Do you know what size chokes are currently installed?

 

Good news, they might be well prized by the vintage Mercedes crowd who might pay good money for them. I would sell them and put the money elsewhere. 

[Henning]

Switch to higher budget in lower carbs.

 

Hen

 

[Layne Tierney]

Haha yeah I thought I'd end up doing that. When I bought them they looked a bit oversized but I was daydreaming of more hp and racecar. Thanks for the input guys. I guess it's time to find some webbers then.

[Simeon]

Those are Solex ADDHE carbs specifically. Same type used on Alpina and Heidegger engines but STILL not as big as 48mm (unless someone more knowledgable can step in). 

 

Basically you would need to be at a greater state of tune than top engine builders used in carburettors on an M10

[zinz]

Yep... those are ADDHE Solexes.  Kind of a rare bird in 48mm.  As Simeon says, a vintage racer would be interested in those.  

 

Nothing wrong with Solexes, though... I run the DDH style in 40mm on my '71.  Parts are not as easy to find as Webers, but there are suppliers in Germany.  Mine have given me no troubles.  

 

 

Ed

[vacca rabite]

3 hours ago, Layne Tierney said:

Haha yeah I thought I'd end up doing that. When I bought them they looked a bit oversized but I was daydreaming of more hp and racecar. Thanks for the input guys. I guess it's time to find some webbers then.

Do like the old VW guys used to do.  Put the huge carbs on and go drag racing.  Then take them off after and put normal sized carbs on for the drive home.  ;-)

The red horns look cool.

 

Zach

[vacca rabite]

2 hours ago, zinz said:

Yep... those are ADDHE Solexes.  Kind of a rare bird in 48mm.  As Simeon says, a vintage racer would be interested in those.  

 

Nothing wrong with Solexes, though... I run the DDH style in 40mm on my '71.  Parts are not as easy to find as Webers, but there are suppliers in Germany.  Mine have given me no troubles.  

 

 

Ed

Man do I ever LOVE how side drafts look on these engines.  So sexy.

Zach

[Layne Tierney]

11 minutes ago, vacca rabite said:

Do like the old VW guys used to do.  Put the huge carbs on and go drag racing.  Then take them off after and put normal sized carbs on for the drive home.  ;-)

The red horns look cool.

 

Zach

Haha yeah I might fire it up just to see what will happen. But I'll definitely keep the ol' 32/36 laying around. 

[Mike Self]

The factory used a pair of Solex 40mm PHH carbs on their ti, and they werfe a lot of carb for a 2 liter engine, so as pointed out, the 48s will be way too big unless you seriously choke 'em down.  Solexes are eminently tuneable (more variables than a Weber) but again, as pointed out. you're gonna spend a great deal of time and money on venturis, jets etc to get it right.  Stick with a Weber 32/36, sell the Solexes and make a little $$ for other 02 parts.

 

mike

PS--welcome to the 02 fraternity/sorority!