weber DGEV 32/36 bogging with secondary openning

[gearhead138]

can I use a later oil pump on the block so I don't have to mess with drive shaft? Is a DSI comparable with a DSII for performance?

 

[69.5Mav]

Ken Thompson

I know I'll get a lot of negative feedback on this but I've been listening to alot of mistaken notions on this and want to set the record straight.

First it's not the size of the carb opening that determins its flow but the size of the venturi. The air flow in its simpilist terms is dirrectly proportional to its area, pie r squared.

The 5200 carb has venturi primary is 23mm and the secondary is 27mm. this gives an area of (23/2)(23/2)(3.14) + (27/2)(27/2)(3.14) = 987.53 square mili meters.

The 1.5 inch maniflod opening has an area of ((1.5*25.4)/2)((1.5*25.4)/2)(3.14) = 4558.05.

Subtracting the venturi area from the manifold opening area shows that the manifold opening has more then enough capacity (4.6 to 1) to handle the flow of a 5200 carb.

This is a simplified explanation and as such it ignors some aspects of the question. A badly designed adapter may indeed still be more restricted then a 5200 but it would have to be very bad indeed.

I do not know the venturi diameters of the weber 32/36 so I can not compair it to the 1.5 inch manifold opening but I suspect it will handle that as well. But even using the bore openings I still get 1821.2 square mili meters so I think it will handle that as well.

As for the 144 engine I don't have any experience with it so I make no comment.

A better way of testing this would be to use a flow bench.

 

[gearhead138]

The weber has 26/27 mm venturis. My adapter is a pretty cool design and I will post a pic if I can figure out how. I agree with the other guys that I have a serious distributor dillema, and that is probably the root of the problem.

 

[69.5Mav]

With that information I do not believe the adapter is your problem.

While your distributer may not be right it has been my experience that a bog such as you describe is primarily a jetting/carb issue. Try running just on the secondary. If you can not then that would point you to a secondary problem. It may run like crap with no idle cross over slot but it should run.

 

[gearhead138]

It runs on the secondary. I might advance my timing and see if that helps with the bogging.

 

[gearhead138]

Advanced the timing to 14*btc and it ran pretty good, almost no bogging, stumbled a little as the secondary opened and then is screamed. Not bad for a sad little 144!

 

[Anonymous]

Thanks for clearing that up for me, Mav 69.5.
Ken

 

[Anonymous]

Hey Mav69.5, as I stated earlier,

Gearhead138,
According to The Ford Falcon Six Cylinder Performance Handbook, the 144 had a 1.00" venturi 1 7/16" throttle bore for 130cfm. I think the carb you have can achieve near 300cfm. If you want a progressive 2bbl, And who doesn't, I would look for a Holley/Weber 5200 off a 78 Ford 2300cc engine. The primary is 23mm and the secondary is 27mm and can achieve a 235cfm. These carbs are found on Pinto's, Mustang II's, Vega's. I hope this helps.
Good luck,
Ken

Now I am just going to findout if the Weber is going to work on a 144 like everyone else.

 

[69.5Mav]

Ken Thompson

No insult intended and I hope you didn't take any. I just thought it was time to show that untill some numbers are run making an asumption can lead to bad results. Now can a card be found that flows more then the adapter, I have no dought. Is dirrect mount better then an adapter again probably. So what does this mean to the average owener.

1) If money is tight use an adapter, they cost $50-60 bucks.

2) For additional improvement when buget permits or if the head is comming off anyway go dirrect mount.

Again if I hurt anyones fellings I'm sorry
69.5mav

 

[falcon fanatic]

gearhead, now just put two size bigger main jet on the secondary and the stumble will disappear.

 

[gearhead138]

I'll try that soon, thanks guys for the insight.

 

[falcon fanatic]

this might be helpful:

http://www.teglerizer.com/dcoe/index.html