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too little timing and could be lean. Need more info on the build

Ace

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So i might.be.jumping the.gun.right now .but wanted.ideas

sound lean and timing off to me to

Sounds way lean to mean. Don't every start a new engine up, unless you are immediately ready to set the timing and adjust the carb. If possible, always use a "known" good carb, and a "known" good distributor on a new engine start-up, so there is less potential for problems.

Charlie

Lean and timing probable, but may also have a cam with to much overlap and pushing compression and boost out the exhaust. Too much cam with boost can be an issue. Just a thought...good luck!

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Its early and still getting my coffee in but...when I say too much cam with boost i mean...a cam that has to much "over lap" ( when the intake and exhaust are open simotaniously (?) ). I believe you said your cam was @ 114deg of overlap. 110 degree is pretty much, as much as you'd want with "boost" (I dont mean under a load- i mean any sort of charger, turbo, S/C., nitrous,etc...) A non superchaged engine relies on atmosphere pressure (approx. 14.7lbs) to ram air into cylinder, along with vacume of the piston, and the air flow in the chamber. When you "boost" an engine it does not need as much help in the overlap and duration department to make this happen. Actually too much and you will pump some of this unknowingly out the exhaust. Stock cam settings in duration and overlap would really work better along with a bit extra lift perhaps. We had a supercharged "roots style" porsche engine in our shop that had a racing cam in it and it was down (320hp/300tq) 60HP over the stock cam. We removed the racing cam, stuck in a factory cam and now without tuning 400HP-376lb TQ. The power was getting wasted and lost by being basically pumped out the ex.. This may not be your issue, but something to consider in the issue you are having. Good luck. I used to deal with MIKE KUHL Superchargers in Santa Ana, CA. 20+ years ago. If he is still in Business he cam give you some standard guide lines in the cam, timing and advance to optimize your engine. Or perhaps on of the other big names in blowers would be worth a call. GOOD LUCK brother!

If have remembered my lessons correctly, a lower than desired (engine) ignition timing may richen the air/fuel mixture within the combustion chamber. With that wrote, if ignition timing is in fact "slow", the air/fuel mixture may be leaner than first thought. As Charlie and others have mentioned, a proven carburetor (fuel delivery system) and ignition system is a MUST when firing a new, previously unfired engine. My suggestion, get the timing right then look at the fuel requirements. Typically a glowing exhaust during a low or no-load condition may indicate a lean air/fuel mixture. Just one thing for thought, vacuum leaks will contribute to such conditions.

Just my jabbering,
Dave.

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