A
Anonymous
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Dan wote
That statement is a mere observation of fact, which is addressed in virtually all books on turbocharging. Here are a few examples, working backwards in time.
In 1997, Corky Bell wrote on page 101 of his book Maximum Boost that "there is little hope for accurate fuel mixture control to satisfy either peak performance or any emission standard." Bell goes on to say that carb'd turbo applications are difficult to make work well above 10 psi boost. Bell's prejudice against carbs is spelled out in clear language in his book, and he makes several outright errors in his comments about carbs, but the comments about mixture control are spot-on.
Hugh McInnes devotes much of Chap 6 in his 1976 book Turbochargers to addressing fuel distribution and mixture control problems.
Finally, way back in 1927 Sir Harry Ricardo devotes quite a bit of The High Speed Internal Combustion Engine's section on turbos to discussing fuel distribution problems.
All of that is NOT to say that carbs and turbos are junk. Quite the opposite. They can be made to work together quite well. It can take considerable effort, though, and the problems of fuel distribution inherent in turbo'd carbs are especially critical for blow-thru setups.
I didn't write that, Dan, and I don't think that one can legitimately conclude from what I did write that I meant that. What I wrote was, It has long been known that pressurised carbs have fuel distribution problems at fairly modest boost levels.
That statement is a mere observation of fact, which is addressed in virtually all books on turbocharging. Here are a few examples, working backwards in time.
In 1997, Corky Bell wrote on page 101 of his book Maximum Boost that "there is little hope for accurate fuel mixture control to satisfy either peak performance or any emission standard." Bell goes on to say that carb'd turbo applications are difficult to make work well above 10 psi boost. Bell's prejudice against carbs is spelled out in clear language in his book, and he makes several outright errors in his comments about carbs, but the comments about mixture control are spot-on.
Hugh McInnes devotes much of Chap 6 in his 1976 book Turbochargers to addressing fuel distribution and mixture control problems.
Finally, way back in 1927 Sir Harry Ricardo devotes quite a bit of The High Speed Internal Combustion Engine's section on turbos to discussing fuel distribution problems.
All of that is NOT to say that carbs and turbos are junk. Quite the opposite. They can be made to work together quite well. It can take considerable effort, though, and the problems of fuel distribution inherent in turbo'd carbs are especially critical for blow-thru setups.
If I can go fast for cheap that is the way I will almost always go. Just don't ask me why I built a six. :roll: 
