Tips for changing intake manifold
- Thread starter LukeZ
- Start date
I ended up with Permatex thread sealer, the 'liquid Teflon' type deal.
That will be perfect, it's the same as the lock tight brand thread sealant just with a different stamp on the tube. 😉
this here tidbit wasn't mentioned... look around that engine compartment and figure out where you'll need to position yourself comfortably while this is going on. you don't want an "oopsie" while you are setting that gorgeous intake down. having a buddy over to pass you the intake while you are in the best spot (ahead of time) is real handy too... you'll do fine! don't rush either.
Do tell? How cold, exactly?
(I have observed this behavior on my newly-built 454, though I keep mentally dismissing it as 'just a carburetor thing' rather than being related to my RPM AirGap intake.)
The Air Gap intake is not equipped with the water/ coolant crossover to help pre-heat the carb., thus taking longer for warm up.
Longroof explains why it happens. A way to tell if this occurring is to get the car up to operating temp then let it sit for 5-10 minutes with the engine off. If you take off after letting it sit and the problem is gone for a short period it is because your intake got heat soaked. The problem will redevelop once enough cold air has been sucked into the carb to cool the intake back off. This is a real issue when the ambient temps are below freezing, but can also develop when the temps are only just below 60-65 degrees.
The cold intake at low air speeds will pull the fuel out of the fuel/air mix and make it puddle on the intake walls. Once the air speed picks up in the intake the fuel will evaporate and then get pulled into the cylinders. If you had an AFR gauge it would show up as a lean to rich condition at 'tip in' when cruising. It's hell to try to tune around. You end up having to live with it or give up on the intake and swap to a conventional one.
I remember talking to a guy I work with who is an old race mechanic and engine builder about the same problem with tunnel rams on the street.
Similar threads
