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Registered
Join Date: Jan 2017
Location: Canada's East Coast
Posts: 723
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I don't understand. This is the third time I've tried replying to this thread so I hope this is the one that will stick.
Just to update on what's been happening I did check the throttle linkage and found some looseness and corrected that as best I could. The engine now revs up to red line somewhat quicker than before but not as quick as I'd like. But I can live with it if necessary.
I did a leak down test and it is what it is. #1 showed 23%. #2 at 8%, #3 at 12%, #4 at 7%, #5 at 11% and #6 at 18%. Not the best , I know, but with 200K mi I won't fret about it too much. I'll test it again before next season.
I did have an interesting conversation with Ian (icarp) and with his experience with these engines (see his videos above) I think his suggestions may be valid.
1. I should and will check the timing at 3500 rpm to see that it is at 30* BTDC. I'll adjust if necessary. That may be a valid point as I've only set the timing at idle.
2. Ian also mentioned, from his experience, the A/F ratio at WOT should be around 10 for maximum power, whereas my A/F instrument shows 12.5 at WOT. I'm not sure how to get it richer at WOT except maybe by some slight adjustment to the WUR which I am reluctant to mess with after my experience this past summer.
Maybe someone with more experience can chime in.
3. Lastly, not knowing how the previous owners may have driven this vehicle, the valves could possibly have some carbon build up so Ian is recommending that I do several treatments of Seafoam and start to drive it like I stole it. An Italian tune up so to speak.
So this is where I currently stand. Thanks to all of you that took the time to reply and offer comments/suggestions.
hughc
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