If I have a Weber 50 DCOE then the bore through the carby is 50mm. I then put a choke in there that is say 42mm. Where is that 42mm measurement on the choke? Is it the thinnest point? The pic below is a slice through a choke...
If I have a Weber 50 DCOE then the bore through the carby is 50mm. I then put a choke in there that is say 42mm. Where is that 42mm measurement on the choke? Is it the thinnest point? The pic below is a slice through a choke...
1970 Mk1 Escort Tarmac Rally Car
its the narrowest internal point
I am trying to draw up a 50 DCOE Weber. The air inlet is sized at 50mm but what size is the outlet (where the butterfly is)? A 45 DCOE is 45mm inlet and 40mm outlet but I don't want to just assume a 50 DCOE is 50/45....
1970 Mk1 Escort Tarmac Rally Car
The number in 40DCOE, 45DCOE etc is a reference to the throttle-plate diameter.
So a 50DCO has a 50 mm throttle-plate (butterfly)
Me confused then. I was partly going off a CAD drawing of a Weber 45DCOE that somebody else had drawn verified by a couple of 45DCOE parts I have.
A 36mm 45DCOE choke measures 45mm across at the inlet side, chokes down to 36mm at its thinnest then increases to 40mm at the outlet suggesting a 40mm throttle plate.
A 45DCOE inlet trumpet is 45mm across its internal diamter which agrees with the choke.
I don't have my 45's off the car in order to be able to measure the throttle plate. Not challenging anybody, just trying to match up info....
1970 Mk1 Escort Tarmac Rally Car
The choke will measure 45mm od, the trumpet will measure 45mm od to slide into a 45mm carb, the choke is radiused from 45mm to the where the choke is measured in the middle so 36mm ID, but the radius shape changes towards the throttlw plate for airflow and to create a venturi, its always thicker on the outside, are you sure youre not looking at it the wrong way around? ie. youre thinking the outside is the inside?
Last edited by Erikmex; 30-06-2019 at 11:05.
nope measured it as above...
1970 Mk1 Escort Tarmac Rally Car
This should help explain what you mean.
Regards,
Kevin
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