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Sept 7, 2020 17:11:59 GMT
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Now,I know they are slow but this is very slow. 50 flat out and an age to get there. It also has an uneven idle and some times cuts out. The back story, I've had this car for 4 years and thanks to covid and furlough I've got it back on the road. The ignition is all new,points,cap,rotor and coil. I don't have a timing light but undone the dizzy and went in either direction but the revs drop so I'm guessing it's in the right place. I cleaned the usual curse word from the float bowl and fixed the leak at the bottom of it. It has a HS4 SU carb with the waxstat jet. Could this be the cause of my curse word performance( mini auto standards) or something else. I'm not expecting cooper s performance but it's not usable in traffic to the point it's dangerous to pull out from junctions despite leaving plenty of time and distance for other road users. HELP!
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slater
Club Retro Rides Member
Posts: 6,390
Club RR Member Number: 78
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Sept 7, 2020 18:15:41 GMT
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Not much to go on. What do the plugs look like? Is it smoking?
It's either fuel or ignition or somthing like head gasket.
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Sept 7, 2020 19:05:52 GMT
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How old is the fuel?
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Plugs look not too bad,not sooty or wet. No smoke at all. I get a strong wiff of fuel now and again. I'm constantly adjusting the idle. Fuel is fresh as it had none in it at all before I got it. I'm going to take the jet off tonight to see if there's any curse word or varnish there.
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Get a timing light, it'll be considerably off by setting it like that. Remember doing the same on my Viva and having awful pinking.
Get a Gunsons CO meter to set the fueling, can make a big difference and could be considerably off. Also consider servicing the carb, it's easy.
Check every where for vacuum leaks. Is the dizzy advance tube attached? Set plug gaps and tappets. Are the ht leads any good? Is it getting a strong spark of you out the plug against the block? Check earth cables. Check ignition wiring for brittleness and micro breaks.
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Project Diary1975 Viva / 1988 T25 Camper / 1989 Mini / 1991 MX5 / 1992 Mini / 1994 Saab 9000 / 1997 Saab 9000 / 2008 Saab 9-5
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Budgets tight for the timing light and co2 meter. I've got an old colour tune set would that help? I don't even know anyone who would have one to borrow. As for the ignition everything is brand new. Even has a new vac tube,I sucked it and heard a click from the dizzy,so I guess that works??? When I got it it had no ignition parts at all so I just got everything new. What does pinking sound like as there is some weird noise at a certain rpm that sounded like a timing chain rattle but goes away quickly.
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TessierAshpool
Club Retro Rides Member
Posts: 507
Club RR Member Number: 168
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Petrol smell, curse word idle and down on power? Sure you're running on all cylinders? Free test would be to pull the plug leads off one at a time to see if the idle changes, if you find one where it doesn't then it's not running on that cylinder.
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Sept 8, 2020 11:34:20 GMT
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I had a mini 850 Auto (1967 MK1) and it was a nippy little thing, a 1000cc version should go pretty well. My 850 would happily cruise all ay at 60mph and if you pushed it more than 70 was easily achievable but I tended to be gentle with it due to the gearboxes fragile repuation.
The timing chain type noise you can hear could well be pinking, especially if its under load when it happens.
The first thing as above is to set the timing, next set the CO. A colour tune should be fine to get this into the right ball park.
Also don't assume that just because everything is new its all ok, modern condensor particuarlly can be bad out of the box although that tends to cause a signficiant misfire (but not always).
Do you have any pictures of the engine bay so we can see that everything looks to be connected correctly?
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Sept 8, 2020 14:15:40 GMT
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As said it could be the timing or something else, theres usually a breather pipe on these carbs that if isn't connected it sucks in air and messes up the idle i think it goes to the crank case on the back of the engine normally. Uneven idle and cutting out could be anything id get the basics done first timing etc. Ive had similar problems after checking the basics and it turned out the jet was bent on the hs4 carb. When you engine mounts wear especially if you have a stage one kit fitted the jet can knock on the bulkhead and bend giving you fuelling problems like curse word idle and poor running in general etc. I used to replace the waxstat jet on all hs4 carbs i had with this www.minispares.com/product/Classic/Fuel/Carburettors/AUD9451A.aspx?1302&ReturnUrl=/search/classic/jet.aspx|Back%20to%20searchThere easy to set up i think vizards book might mention how to do it if it is the jet. Been a long time since i had a mini. |
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Last Edit: Sept 8, 2020 14:22:58 GMT by retroray
1967 Beetle
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