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Posted By Discussion Topic: Splat -- page: 1 2     JayChicago 09-18-2016 @ 7:02 PM reply profile send p.m. Member Posts: 480 Joined: Jan 2016 40 Ford, all stock I get a splat of soot blasted out the tail pipe upon cold start up. Leaves a big black stain on the garage floor. Engine starts easily. I use minimal choke and open the choke totally a few seconds after engine running. This engine does not have obvious smoke out the exhaust any other time. Sound familiar? What does this indicate? ken ct. 09-18-2016 @ 7:22 PM reply profile send p.m. Senior Posts: 1513 Joined: Jan 2010 Could be excess carbon build up in cyl. from previous running , it should clear up with a good run on the interstate,worth a try ?? ken ct. 40 Coupe 09-19-2016 @ 4:11 AM reply profile send p.m. Senior Posts: 1675 Joined: Oct 2009 Remove the plugs to check if they have carbon build up (black soot) it could be the engine is running rich. Usually due to the incorrect size jets in the Carb. If you have done Carb work do run the engine hard to see if you can clean out deposits from a previous problem. len47merc 09-19-2016 @ 4:41 AM reply profile send p.m. Senior Posts: 1165 Joined: Oct 2013 As you very likely know, moisture condenses in your exhaust system while running - under the right ambient conditions sometimes a considerable amount. This is particularly prevalent during cooler and more humid periods when you see the water vapor behind the car and the drips of condensed moisture dripping from the pipe. During the previous operation should you not have driven the car or operated the engine for an adequate period of time to fully dry-out the exhaust system the moisture will sit and pool in low areas of your system and dissolve any surrounding exhaust deposits into a pool of black soot that will, as you say, 'splat' out on the next crank of the engine. It does make a mess and is virtually impossible to remove from a concrete garage floor (not to mention walls, shelves, other equipment, etc.). The best way to avoid this is to ensure you are not running too rich a fuel mix in your motor and always operate/drive your engine/car at rpm for at least 30 minutes minimum to allow the engine to fully warm to temp and as well fully dry out the exhaust system. Once making a car safe and operational I never crank it for any reason without planning on a drive adequate to dry out the exhaust system, not only for this reason but to avoid the rusting effect of the moisture in general (45 mins min for me). If the car cannot be driven or the motor has to be run for some maintenance I try to operate it long enough to dry out the pipes or drive it first for 30 minutes if possible, respectively. Once you've confirmed your engine is not running excessively rich, if this drive-time doesn't work for you, cover the floor or temporarily zip-tie an old sock over the tailpipe to catch the initial blow (latter sounds crazy but I've seen it done). Btw, from my experience, it is not unusual for a properly set-up and adjusted flathead to leave a minimal amount soot in the pipes. I'd be careful how far you 'lean-out' the fuel mix - IMHO an absolutely not black but dark-to-mid gray exhaust pipe is far better than a light-to-whitish-gray, from both performance and engine health perspectives. Typically a flathead's exhaust pipe will show a very minor amount of darker-to-mid-gray deposits with plugs showing as burning properly. Steve This message was edited by len47merc on 9-19-16 @ 5:31 AM joe b 09-19-2016 @ 6:09 AM reply profile send p.m. Member Posts: 389 Joined: Oct 2010 I think they all do that when they have been sitting for awhile. It is just a Flathead acting like a dog to mark it's spot. Len47 has a good explanation. TomO 09-19-2016 @ 8:44 AM reply profile send p.m. Senior Posts: 7252 Joined: Oct 2009 The muffler(s) need to have a 1/8" drain hole at the bottom front and back. Your 40 is probably running rich or your power valve is leaking. You should not see a black "splotch" when you start your engine. Oil Eater degreaser does s good job of removing the black carbon stain. Tom ken ct. 09-19-2016 @ 9:45 AM reply profile send p.m. Senior Posts: 1513 Joined: Jan 2010 His carb has .049 MJ in it so its not on the rich side !!! ken ct. JayChicago 09-19-2016 @ 12:33 PM reply profile send p.m. Member Posts: 480 Joined: Jan 2016 No, Ken, the splat-out-the-exhaust symptom is with the original carb still on the car, not with the rebuilt carb you sent me. I will post a follow-up when I get your carb installed. Thanks for the info everyone. The plugs are black with short running time on them, so I guess its obvious the engine is running too rich. This could also explain why the miss I was experiencing was more prominent under steady cruise and not so obvious under acceleration....the engine might like a rich mixture under acceleration but can't handle it under light-load cruise. ken ct. 09-19-2016 @ 2:06 PM reply profile send p.m. Senior Posts: 1513 Joined: Jan 2010 Let us know what # jets are in the old carb when you change them. I would install new plugs 1 step hotter and gap to .025. ken ct. JayChicago 09-21-2016 @ 5:04 AM reply profile send p.m. Member Posts: 480 Joined: Jan 2016 Follow-up: Installed the new carburetor, engine is running great. No more blowing carbon out the tail pipe on startup. Drove to our regional group's meeting last night, ran great, no more missing. I'm happy. I really appreciate all the help I received here. Ken: I removed the two jets visible in the barrels above the venturies. I assume those are the main jets. No number on them. I examined with a magnifying glass, no number. Previous owner had this carb rebuilt ten years ago, maybe using some cheap kit?

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