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Carter AFB Metering Rods/Tuning

July 24 2011 at 5:28 PM
Wes Stinson  (no login)

Right now i have the 23' out of the water for a little bit of cleaning, I'll be posting some rather brilliant results later this week.. I went without internet for 2 weeks here at home and finally have my connection restored.

For reference, I have a 327F with a carter AFB. When I rebuilt the engine about 3 years ago, I added an edelbrock performer manifold and a slightly hotter cam, since the original cam was worn out a bit.

Anyway, I have replaced every single component in my ignition system, and I am still chasing a high RPM misfire. Based on the spark plugs, I am fairly certain the engine is running lean at high RPM. Under 3000 it runs great, after that it will want to pop and miss..

First thought is to replace the meter rods to try and add a little bit of fuel. My current metering rod that is in the carb is a 16-205 which is .069" x .063".. According to summit racing, these are the options I have for stepping up..

0.057 x 0.049
0.058 x 0.052
0.060 x 0.057
0.062 x 0.052
0.063 x 0.037
0.063 x 0.047
0.065 x 0.037
0.065 x 0.042
0.065 x 0.047
0.065 x 0.052
0.065 x 0.057
0.067 x 0.049
0.067 x 0.055
0.068 x 0.042
0.068 x 0.047
0.068 x 0.052
0.068 x 0.057
0.070 x 0.037
0.070 x 0.042
0.070 x 0.047
0.070 x 0.052
0.070 x 0.057
0.071 x 0.047
0.073 x 0.037
0.073 x 0.042
0.073 x 0.047
0.073 x 0.052
0.075 x 0.037
0.075 x 0.042
0.075 x 0.047

My thought is the best one would seem to be the .068x.057, that would be the "next step" down adding more fuel...

At about $10 a pair, I can afford to get a few sets to try..

I found this old post from a while ago here, and Mark Weller suggests just ditching the metering rods.. His rationale makes sense, and in a boat you are not particularly worried about squeezing every MPG (or GPH) out of it, especially something used for leisure..

If this is the case, I would imagine I would need new jets since without the metering rod they are gonna be way too big. I haven't torn apart the top of the carb to see what jets I have...

I really feel like I need a very minute change in the A/F ratio, because it runs pretty good.. It doesn't detonate, the spark plugs just look lean and with it misfiring, I would think the best thing to do would be to grab a couple sets of metering rods and try them out.

What do you guys think?

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