Car almost dies when I apply brakes
- Thread starter dickeymoore
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Checked the floats and the rear one was way too high got it adjusted down and it seems fine but I notice on the brass plug one of the black little gaskets are missing should I buy new plugs with the new gaskets or can I run it like this and it be okay ,really want to clear plugs but i heard they are promblems. Thanks
The clear plugs are only for settting the floats. You may want to invest in a good A/F gauge which would have told you the engine is running rich which could cause it to stall. If it was the front float too low the lean mixture would have told you what to look for.
Sounds kinda low and it will have the effect of pulling more air into the carb and disturb the fuel air ratio.
If you have low vacuum in a performance engine it usually means the cam has a lot of overlap where both valves are open for a while. With the valves open you won't make much vacuum. And vacuum is measured in inches of mercury (inHg, HG being the atomic symbol for mercury), not PSI as it's not pressure it's measuring.
Low vacuum is nothing to be concerned about if the engine has a big cam in it on purpose. Stock engines (even old carbureted ones) usually were 14" to 20" depending on things like wear, if it was a factory "high output" engine, etc. My worn as hell 350 still got 17-19" of vacuum with a cam with 276/281 degrees of duration. That was mainly due to it having a 112LSA... but i digress.
If it's a steady 11" and your cam isn't too much for this engine (doesn't matter what your other engines did, what matters is what this engine is doing), try messing with the timing (advancing it) and turning the idle back down and adjusting the mixture screws. If that does nothing, that's just what the engine does I suppose unless you take it apart and change the cam timing physically.
Apologies if I come off as preachy or like a shop teacher, I'm just on a roll.
Low vacuum is nothing to be concerned about if the engine has a big cam in it on purpose. Stock engines (even old carbureted ones) usually were 14" to 20" depending on things like wear, if it was a factory "high output" engine, etc. My worn as hell 350 still got 17-19" of vacuum with a cam with 276/281 degrees of duration. That was mainly due to it having a 112LSA... but i digress.
If it's a steady 11" and your cam isn't too much for this engine (doesn't matter what your other engines did, what matters is what this engine is doing), try messing with the timing (advancing it) and turning the idle back down and adjusting the mixture screws. If that does nothing, that's just what the engine does I suppose unless you take it apart and change the cam timing physically.
Apologies if I come off as preachy or like a shop teacher, I'm just on a roll.
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