HI All,
over the last few months I have been dialling in my 445 build in my Thunderbird. All going well but having an issue with the carburetor.
The problem is if I leave car for a week or so and start it up, it blows black smoke until it warms up. Then when I start it hot after a few hours it spits fuel out of the exhaust. Other than that the engine is running well, carb setup with air flow meter and pulls around 15 lbs of vacuum at idle.
I noticed at initial startup that the car blew black smoke and I replaced the power valve (6.5) with a new one and all seemed ok. When I pulled the old valve out I noted the well behind the power valve was flooded with fuel.
This week it happened again, smoke at startup so I checked the power valve again. Yes, the well was full of fuel again. If you click on the image below it should zoom in to an image of the metering plate. This is the best image I could get but it seems to have a lot of hairline cracks in the area between the two jets.
Has anyone seen this before and could it be the cause of the fuel flow into the well? Any thoughts will be greatly appreciated.
The carb is a Quickfuel 780 vac secondary.
Thanks
Graeme