Eventually it happened to be I borrowed the carb on the GL (which is a 80321, model 350CFM 2300-2V (Holley) carb). It ran great, running up at WOT to 4600 rpm which however is strange with 350 CFM I guessed. The 1997 GL with the carb. specification tells it would do 4200 rpm, but no, it went easily to 4600 which is the GS spec. which is based on the 80316, 500 cfm 2300-2V carb, thus higher CFM/airflow. And yes, when I used my old 500CFM it indeed did 4600 rpm as well. No difference. It looks thus the power output is equal while GS=135HP and GL(1997)=120HP spec'd. Hmm, when I calculate the appropriate CFM for this 4 banger I get : ((181 (CID) * 4600 (rpm)) / 3456 = 240 CFM (!), assuming Volumetric Efficiency = 100% (else CFM would even be lower). So, that would assume the 350 CFM is actually a better fit ? I am puzzled as why all others have been utilized with 500 CFM as this seems overkill ? It does however explain to me I can get up to 4600 rpm with this 350 CFM carb. Btw. I intend to buy this carb as it's a properly functional OEM delivered Volvo Penta carb. Any thoughts on my assumptions with this 350 CFM being properly size for the 3.0L 4 stroke 135HP ???
btw. I bought a 500 CFM remanufactured carb from Sierra to replace my original 80316 worn one recently, ... which didn't work and seemed to be altered (scratches on nuts). Middleman supplier refuses to believe it came out of the box this way and won't take it back ! We determined the fuel bowl was seriously misaligned which was easily corrected but mixture is also completely off as my spark plugs get extremely wet at higher rpm making a restart even impossible. So, I am sitting with this "new carb" and I my mechanic is done with this carb. Screw reman. carbs. and guess this will be a project for later. Any experience with these "reman" carbs, is this more common or was I just unlucky ?
