I installed a Weber carb kit on my Volvo 230A. The Weber info suggested that the timing be advanced somewhat as the carb provides more fuel. I did advance the timing a little and the engine runs better, I was getting hesitation before and idling was a bit rough. My question is how much advance is needed and or how do you determine the amount?
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You are reaching into a dangerous area with regard to increasing Marine Engine ignition advance, and in particular, TA (total advance).gaffcat wrote:
I installed a Weber carb kit on my Volvo 230A. The Weber info suggested that the timing be advanced somewhat as the carb provides more fuel. I did advance the timing a little and the engine runs better, I was getting hesitation before and idling was a bit rough. My question is how much advance is needed and or how do you determine the amount?
I'd suggest that you see your OEM specs, and stay within those perimeters.
Too much ignition advance can create ignition induced detonation... and it can occur in a New York minute.
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Rick E. (aka RicardoMarine) Gresham, Oregon
2850 Bounty Sedan Flybridge model
Twin 280 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
Please, no PMs. Ask your questions on forum. -
The link to the post in my signiture has downloadable oem manuals for these, I think the advance for the 230 is 32-36*. Running E10 fuels I have had to shoot for the lower end of that timing range. I agree that the idle has always been better advanced around 8-10*, but spec is 6* and while I don't like it, that puts the all-in timing in the danger zone. It's on my long list of things to do, to find some distributor springs that work and make an adjustable stop for the advance weights so that base and total timing can be tweaked.
The cams in these are a bit lumpy and idle reflects that, it's normal for these.
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