Crazy carb idea ?

[Anonymous]

for over a year I've been thinking about Al "der hackmeister's" handi-work with a sawzall.

Several years ago I accquired a bunch of side draft carbs off 30, 40, and 50 hp Evinrudes. They are in a box gathering dust.

I'm pretty sure I could adapt them to a head, but no so sure about fuel and linkage.

The fuel lines are/were very small diameter push on plastic jobs, and I have no idea how the throttle/chokes work.

I've got 20+ grand of GI bill to use, so I'm going to take some welding classes this summer. Maybe I can learn how to weld/modify a log head.

Is this feasible? Outboard carbs on an automotive head? I've been thinking about this for a couple years, which is why I grabbed the carbs.

If this is way out of line, maybe I can tri-power my riding mower!

 

[MustangSix]

somewhere in the past there was a post with pics of a similar setup using motorcycle carbs. Intake sawed off, stubs welded on, cycle carbs clamped on.

When you twist the throttle, hang on!

 

[BIGREDRASA]

Hmm. Two issues come to mind: 1) do they have chokes; 2) do they have accelerator/power circuits? It would seem a prop doesn't put on the same load as a tire when trying to rev up.

 

[gtm1086]

Sorry to rain on your parade. But I don't think the outboard carbs will work. The biggest issue is no accellerator pump . Depending on the age of the carbs they may or may not have a choke. Two strokes don't need the extra shot of fuel like a four stroke to make power on the low end.

Gary

 

[xctasy]

If you read some ancient Vizard books, the hot tip was Mikuni 44 mm carbs of Honda super-bikes. These have CV carbs which are very adjustable. They do stay in tune, are small, light, and have a vast array of parts back-up. Six of em would be just the ticket to have the under hood emissions guys ringing for thr cops...or the nut house!

Theres only one thing not doing its job on a Ford six....the intake manifold. Carbs like these are a better bet, no danger.

 

[MustangSix]

Constant Velocity (or Constant Depression) carbs don't normally have an accellerator pump circuit or a high speed "power valve" circuit. They rely on the differential pressure moving across a venturi to adjust jetting according to airflow.

I'm going to try a pair (or maybe three) Stromberg CD175 sidedrafts on this next engine.

 

[twentyover]

Motorcycle carbs tend to come in two varieties- the older slide-needle type and the now more common CV type referenced by MustangSix. The older slide-needles (I remember a set of Amals on an old Norton Commando I used to ride) generally were set to run rich all the time- when you cranked open the throttles, it leaned, but if jetted correctly (for the time) not so lean you stumbled. The needle opened the fuel flow area in the venturi, and away you went.

More recent CV carbs have a 'virtual accelerator pump' generated by increase vacuum when you whack the throttle, and have been in automotive use since the turn of the century (the last one, not this one).

In the mid-sixties Ak Miller took a log head and brazed on ports for 4 carbs off a 450 Honda DOHC motorbike- one of the first high volume applications of CV carbs on scooters in this country. He also had a set of stubs brazed on for a set of 2 Jag HD8(?) carbs)

 

[Anonymous]

why al this trouble , !!!!! just pickup some double dellorto side draft carbs ore solex , verry cheap here ,take 3 of them [ like i did ] make some adapter plate to attach the log head on the side and bolt it to it !! and adapt the carbs ! i whas into this ,but did go for a single double dellorto turbo , lpg setup !
notice , !!!! this whas my example setup for the idee , i did make a adapter plate that wil attach the orginal log head [ D8 head ] side wards !!
like the offenhouser system that is on top , i did make it attach side wards !! it would be a bolt on kit like the offenhouser , but lost my intrestin it , too much work to make the adapting plate too attach the head ! maybe not for for 1 setup , when many people would wand 1 this would be interresting ! maybe also for a 2 setup with double dellorto,s !

 

[addo]

Ah! Hotrod Bill's motor again. I wonder how he's coming along with it?

Adam.

 

[Guest]

Here's an AK Miller pic

 

[xctasy]

Righto, who's first to cut there strut towers off to fit one of those babies. The carbs would be ultra close to the right hand side tower, no : .

A Nice Mustang II, Pinto, Cortina six or Taunus coil sprung subframe front end front end would be needed just to fit those carbies in the bay of a pre 68 Stang or pre 66 Falcon. Or you could tilt the block 21 degrees to the left with an adaptor plate....now theres an idea :idea:


Loved the pics Harrie and HotRod. You are surely the men!

 

[addo]

Bill did have to notch the shock tower, but I'd trust him to get it right. As for subframe swaps - no thanks!

Cheers, Adam.

 

[xctasy]

Good boy. I always have to put a Foward Slash on things :arrow: /////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| :fume:

Watch the domino effect on this post. Every one will be taking to there Fox or Falcon framed six-potter with a hammer, and ringing international for Harrie's patterns!

 

[Asa]

hmmm.......
how much of a point would there be to use something like that as well as a crossflow conversion? worthwhile? or are there better, more powerful solutions?

to make that feasible though, i'd have to have some similar carbs and a crossflow head... *sigh*