PatK Posted November 25, 2021 Report Share Posted November 25, 2021 Hi All, my Vitesse is fitted with Strombergs 150 CDS, the front carb is 3224F and rear 3224R. Only the front carb has a fuel enrichment supply, the rear one is fed the same enrichment supply via a tube. On this carb fuel enrichment is supplied by a circular disc with calibrated holes, from small to large and this disc allows fuel to the intake side of both carbs, the fuel being drawn directly from the float chamber. When the choke cable is pulled, the disc rotates and supplies more fuel the further the choke is pulled out. To match the increasing amount of fuel supplied, the carb throttle has also to be opened to get the right fuel air ratio, and this is achieved by a cam attached to the disc spindle, which opens the throttle more as more fuel is supplied. The amount that the throttle is opened is governed by an adjustable bolt that contacts the fuel disc cam, and this is my problem as I can find no reference in any of my manuals on how to set up the clearance between the bolt and the cam ( the cam is attached to the choke cable as shown in the photo below as is the small bolt whose head is contacting the cam.) I would very much appreciate any help that you wise people can give me. Thanks Patrick Link to comment Share on other sites More sharing options...
NonMember Posted November 25, 2021 Report Share Posted November 25, 2021 About where you've got it is a good starting point. It needs to have clearance with the choke fully off but to raise the idle speed before enriching. The corner of the cam (left of the cable fixing, directly below the adjuster bolt head, in your photos) is the reference point for that. Beyond that, it's a matter of judging the fast idle when cold. The book spec is probably a faster idle than your gut feeling says (though probably not as high as the Acclaim's >2000RPM figure). Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 25, 2021 Report Share Posted November 25, 2021 a gap eg 1mm but there must be a small gap you have non triumph carbs as you have the summer winter choke stop quite useful its just push and turn to set more or less choke having a start valve on the front and tube tp rear is quite normal pete Link to comment Share on other sites More sharing options...
trigolf Posted November 25, 2021 Report Share Posted November 25, 2021 Pat, According to my Autobook 723 manual the choke fast idle screw gap for the standard - earlier CD150 carb should be set at 1.6mm (1/16th). I can't find a specific setting for the 150 CDS carb. I always start with that setting. They are the correct originally fitted items for a MK2 Vitesse. Gav Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 25, 2021 Report Share Posted November 25, 2021 with wear and tear its not unusual to reprofile the lead of the cam so you do get a good fast idle as when worn it has a limited uplift in idle then they stall and soot up needs a good fast idle 1500/2000 rpm so you actually burn the en riched mixture the first 1/2" of choke pull wants around 1000 but a lot more on full choke Pete Link to comment Share on other sites More sharing options...
PatK Posted November 25, 2021 Author Report Share Posted November 25, 2021 8 hours ago, Pete Lewis said: a gap eg 1mm but there must be a small gap you have non triumph carbs as you have the summer winter choke stop quite useful its just push and turn to set more or less choke having a start valve on the front and tube tp rear is quite normal pete Thanks Pete, I thought that these carbs were correct for this Vitesse! Link to comment Share on other sites More sharing options...
PatK Posted November 25, 2021 Author Report Share Posted November 25, 2021 Thanks Gav that was very helpful, I will try that setting and hopefully that will be a starting point. Link to comment Share on other sites More sharing options...
PatK Posted November 25, 2021 Author Report Share Posted November 25, 2021 2 hours ago, Pete Lewis said: with wear and tear its not unusual to reprofile the lead of the cam so you do get a good fast idle as when worn it has a limited uplift in idle then they stall and soot up needs a good fast idle 1500/2000 rpm so you actually burn the en riched mixture the first 1/2" of choke pull wants around 1000 but a lot more on full choke Pete Thanks Pete,that now makes sense as I thought that the idle was too fast, so I will set it at that setting. Link to comment Share on other sites More sharing options...
Pete Lewis Posted November 26, 2021 Report Share Posted November 26, 2021 the gap is there so it doesnt interfere with the idle settings and makes it easier to pull the choke as this should use the lost motion levering so choke does not react all back through the throttle Pete Link to comment Share on other sites More sharing options...
PatK Posted November 26, 2021 Author Report Share Posted November 26, 2021 2 hours ago, Pete Lewis said: the gap is there so it doesnt interfere with the idle settings and makes it easier to pull the choke as this should use the lost motion levering so choke does not react all back through the throttle Pete Thanks Pete, good info. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now