v8classic Posted December 14, 2015 Share Posted December 14, 2015 I'm back! I've eventually got the engine started 3.5 V8 on twin Su carbs and it's ticking over fine on the choke but as soon as I turn the choke off it splutters and stalls. I have tried adjusting the mixture but to no avail. Even if I try to give the engine a bit of throttle it still fails. Any ideas? Cheers Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted December 14, 2015 Share Posted December 14, 2015 Which SUs are they? Quote Link to comment Share on other sites More sharing options...
v8classic Posted December 15, 2015 Author Share Posted December 15, 2015 I'm pretty sure they are Hif44 but I'm not too sure how do I tell? Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted December 15, 2015 Share Posted December 15, 2015 Have a look at what the damper pistons are doing when you close the choke - is it possible there is some restriction in the air tract and are the engine breathers clear. Disconnect the breather from the rocker to the carb and see if it changes. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted December 15, 2015 Share Posted December 15, 2015 Thinking there may well be an air leak somewhere.... Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted December 15, 2015 Share Posted December 15, 2015 I've seen a bit of excess back pressure ram the damper pistons up when the choke opens and the mixture goes mega rich.. if you loosen the oil filler cap and see whether it changes. But it looks sounds like something air related not fuel or mixture setting Quote Link to comment Share on other sites More sharing options...
v8classic Posted December 15, 2015 Author Share Posted December 15, 2015 Excellent I will have a look at that this weekend. I think the pistons are permanently down but that could be wrong. How do I check for an air leak? Spray easy start and see if the Rickover raises? The oil filler to the engine or on the top of the carbs? Thanks for the help guys. Quote Link to comment Share on other sites More sharing options...
GW8IZR Posted December 15, 2015 Share Posted December 15, 2015 oil filter on top of engine, just slacken it so it can breathe but not spray hot engine oil in your face ;-) good luck , its a simple engine and it will run once you sort it.. Quote Link to comment Share on other sites More sharing options...
v8classic Posted December 22, 2015 Author Share Posted December 22, 2015 Evening all a bit of an update for you and hopefully a bit more help for me. Checked the breathers they are clear. Opened the oil filler and ran it with that open but no real change there either. I did notice I had coolant resting on the valley gasket so I have stripped the inlet manifold off to see what's leaking. Any tips for the best way to put that back on. May that be where the air leak could be? I also checked the pistons too and they were down when it opened the throttle they moved up slightly. It's really strange it just won't rev or idle! Quote Link to comment Share on other sites More sharing options...
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