Hi I'm fitting twin Dell 40's with Bell Crank Linkages. I've been reading that I need to make modifications to fit the linkages to a type 4 engine 2l aircooled. Are modifications needed on the manifolds too? Does anyone have any pics of what modifications are needed. Cheers Neil
Didnt modify mine but unsure what manufacturer they were. Manifolds need drilling and tapping to recieve a barb for the servo connection for the brakes if they dont have one. I only have one tapped but may do the other one too! Oh yes and you need to review where the cable comes through the tin ware as if its at the wrong angle you wont get the required cable travel!
Pic when initially fitted. Fuel filter was moved outside engine bay an cable re-routed to cone through the hole in the tinware where the clip for the servo balance pipe screws in.
i've seen conflicting messages about whether the CSP linkage needs modifying or not and dependent on what carbs you have. I bought the weber type 1 to go on my type 4 engine, don't know if it will fit with my dells or not, but the height difference between my dells and webers is huge as I have short stubby T25 manifolds on my dells. I have a feeling that i'll need longer rods? @Top Banana Racing has his inverted for some reason? Fit it and see, it should be easy to work out if you need to change anything.
I used the CSP manifolds on TBRs engine, and I found that the linkage bar on the LH carb fowled the acc cable, so I fitted the linkage to the bottom of the swivel plate!! I've got another one here that has been fitted to 48s on BAS manifolds, and the LH linkage bar has been lengthened!!
ok so I see that i've bought the entirely wrong one as its not going to fit on my type 4 block. Bugger... Type 1 CSP bell crank in for sale section soon...
Why is nothing just straight forward and a straight fit Oh the joys!! Clicked on the wrong linkage too when I placed the order which didn't help. Plonker #2
i'd consider modifying the bracket but its too nice - i'm better off selling this and buying the correct one
Bit puzzled about how/why the brake servo pipe needs to be attached to the manifold. Is there not air and FUEL going through that manifold?
The servo works by utilising the vaccum created by the engin "sucking" in through the carbs. The line to the servo is a closed one and operates a dighram on the servo. Your not getting air and fuel into the line as the engine is sucking from it. The line has a one way valve (or should have) that prevents any backfire from damaging the servo. It is common for a leak on the servo line to cause engine running problems if it leaks air in!
I inverted mine to get the cable run perfect and straighten out the linkage bars, it's a joy to use now. Luuurvely.
Ok I get it now it's the engine side it's sucking from. There is a wee valve on the servo hose which I guessed was I one way valve. Any pics of the 'inverted' set up? Every day is a learning day.
