I have been doing test work for the largest Weber dealer in the US on the new carbs. The failure rate on them is about 60%, the biggest and most widely found issues are throttle bores that are not round causing bound up butterflies as well as porous castings that leak fuel both internally and externally.
We have to use these carbs on our engines so it is important that we find the issues as well as make our client aware of the issues so they can scream at Weber and make them take their parts back.
From now on any carbs that we sell will be bolted to an engine and ran on the dyno prior to being shipped, this will cost a few more bucks and will slow the order down but with a failure rate @ 60% and so many carbs with issues in circulation right now it is mandatory.
Here are some of the casting flaws that we found yesterday with a brand new Weber 44mm carb.
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Fat performance has been building racing T-4 engines for as long as some T-4 engine builders have been alive
That is true, however they were not called upon to find the source of these carburetor issues and provide a solution to them. This solution will benefit every single VW/ Porsche enthusiast that buys a set of Weber carbs in the future.
The guys at FAT are great, and I am proud to have them as a true competitor.