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Posted By Discussion Topic: advance timing -- page: 1 2 3     sundog126 06-24-2020 @ 4:13 PM reply profile send p.m. Member Posts: 22 Joined: Mar 2018 i'm using new Offenhauser 2x2 intake, tried blocking off each carb holes, tried a couple of plugs and diff. setting,i believed the shop welded the small crack in the block, also running Offenhauser alum heads, and hot dist and coil from summit, I think there brand. i will try the spark test, I have a video of my engine vacuum and poping but don't know what website to show it on. sundog126 07-01-2020 @ 10:33 AM reply profile send p.m. Member Posts: 22 Joined: Mar 2018 shouldn't a compression test show if the exhaust valves are sticking ? i have good compression carcrazy 07-01-2020 @ 11:37 AM reply profile send p.m. Senior Posts: 1597 Joined: Oct 2009 Yes, a compression test should show if you have a valve sticking. I would focus on checking the timing. If you are sure you have the correct ignition timing then you will have to get into the valve timing. I suspect your 3/4 cam has too much overlap to allow the engine to idle correctly. Does the engine smooth out and run better once the speed is increased to 2,500 RPM or more? 37RAGTOPMAN 07-01-2020 @ 12:09 PM reply profile send p.m. Senior Posts: 1942 Joined: Oct 2009 Hi Recheck your ignition wires if are on right, condenser and point wiring tight,? wobble in distributor plate , or play distributor shaft ? is the dwell steady ? did you check if the timing is advancing , with a strobe timing light, if running dual carbs you might have to try different springs on the vacuum advance, a ball point spring is what a friend of mine had to do with dual carbs, and it worked on his 1950 FORD, not enough vacuum to advance the plate. with dual carbs, hope this helps, 37Ragtopman sundog126 07-18-2020 @ 8:03 AM reply profile send p.m. Member Posts: 22 Joined: Mar 2018 I did a cyl. leak/bleed down test ,each cyl showed in the green 18-20% leak out of the dip stick hole which isn't much, like I said before compression test showed 140-145lbs on ech cyl ,still not sure why the vacuum test shows the needle vibrating 3-15 ins and still pops out the exh when rpms are increased,now i'm thinking bad cam grind or cam was put in off one mark. This message was edited by sundog126 on 7-18-20 @ 8:44 AM sarahcecelia 07-18-2020 @ 11:55 AM reply profile send p.m. Senior Posts: 1171 Joined: Mar 2013 My friend Bruce had a similar problem. Poor idle and vacuum bouncing all ove the place! He brought the car to me. I found out by finally taking the top off of his carbuetor, that one screw that holds the "pee" tubes was stripped, among other things,and the idle mixture adjustments would not respond correctly. I sold hom a perfectly good carburetor for $50, installed it, and adjusted the idle mixture screws,and idle speed. Vacuum is steady now, and It runs like "new" and I have fixed a lot of problems for a lot of Flat head owners; They nick named me "The Man." They say that I can fix any problem they have, and when I do; They say, "Your the man" Steve. I am just getting back to speed on these, as I haven't messed with a flattie much since was in my 20's, and that was 60 plus years ago!! I had a '50 in 1955,and fixed it all. I didn't have the cash to pay a mechanic! Regards, Steve Lee 40 Coupe 07-19-2020 @ 5:07 AM reply profile send p.m. Senior Posts: 1650 Joined: Oct 2009 A compression test will not always show a sticking valve. Big difference between starter motor RPM and idle RPM . TomO 07-19-2020 @ 8:23 AM reply profile send p.m. Senior Posts: 7244 Joined: Oct 2009 You need to do the cylinder balance test to see if the problem is isolated to one or more cylinders or is a random miss. Once you know that, it will be easier to isolate the cause of your problem. Compression vacuum and leak down tests all have their uses, but you should have an idea of what you are looking for before doing the tests. Your description of the vacuum test indicates the problem may be isolated to one or more cylinders and not a random miss, but you won't know until you do the cylinder balance test. Tom sundog126 07-19-2020 @ 1:19 PM reply profile send p.m. Member Posts: 22 Joined: Mar 2018 that's for your input Tom, I am running 2 carbs, I removed and blocked off one at a time seem to make no difference, I did the cyl bleed down test on all cyl. 3 times to see if one of the valves were sticking, all cyl had the same loss ,that's why I am going to remove the front gear plate to make sure the cam is lined up with the gears ok ,sense the machine shop that did my engine is shut down I am on my own doing this. TomO 07-20-2020 @ 7:00 AM reply profile send p.m. Senior Posts: 7244 Joined: Oct 2009 A cylinder balance test is not a bleed down test and will give different results. You can tear down your engine to try to find the problem, but I am trying to help you get to the area of the problem faster. Tom

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