Re: 318 4 BBl carb
Posted: Sat Oct 20, 2018 10:13 am
There is something weird going on here. When you have the starboard engine running faster than the port, the boat should be turning slightly to the left.
It sounds to me like the secondary is still not opening up or there is no fuel getting to its jets.
While I realize that the 6212S is the carb that came with your boat, Carter showed it as a 700cfm carb and that is a lot of carb for a stock 318. you might consider just replacing with a 600cfm Edelbrock 1409, which is a copy of the Carter AFB you have with smaller secondaries. Even a 440 will be fine with a 600cfm carb as long as it stays at or below 4000 RPM. The 1409 will give you better throttle response and should slightly improve your fuel efficiency.
Here is some carb info from Carter: http://www.oldcarmanualproject.com/manu ... ndMisc.pdf
Also, have you checked the ignition system? This really sounds like a fuel problem, but it is worth a few minutes to make sure the timing is correct and the advance is working.
It sounds to me like the secondary is still not opening up or there is no fuel getting to its jets.
While I realize that the 6212S is the carb that came with your boat, Carter showed it as a 700cfm carb and that is a lot of carb for a stock 318. you might consider just replacing with a 600cfm Edelbrock 1409, which is a copy of the Carter AFB you have with smaller secondaries. Even a 440 will be fine with a 600cfm carb as long as it stays at or below 4000 RPM. The 1409 will give you better throttle response and should slightly improve your fuel efficiency.
Here is some carb info from Carter: http://www.oldcarmanualproject.com/manu ... ndMisc.pdf
Also, have you checked the ignition system? This really sounds like a fuel problem, but it is worth a few minutes to make sure the timing is correct and the advance is working.