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ChadS
05-27-2005 06:36:28
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Re: For ChadS in reply to Hayfarmer, 05-26-2005 21:39:51
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The distributor advance timing is not very much on the M-450, the H's actually had the better distributors in them, the allow more full advance timing. it has more travel in the advance VS the M-450.Usually, when I do what you just did, you have sped up the responce time in both the carb, and ignition. Somewhere along the line, more modifications have to be done to compliment the changes you have done. Either its not getting enough fuel, or the coil is not hot enough to run that high of rpms. If, you can open up the throttle, and then open up the main load adjustment screw on the carb, and not make it smoke or run rich, you need to rejet it. You can also kinda test your carb and igntion by turning the distributor, so it labors while running, if it has a misfire anywhere,, it will do it then, it is just like being on a dyno, but dont get crazy by turning the distributor too far now!!! Just enough to make it sound like its under a load. Work that engine a little, then shut it down, and pull out the plugs, if they are whiteish, or lite colored, a bit more fuel is nessisary, if it has a stutter upon acceleration, its either carb, or ignition, 9 times out of 10 its the carb, but since your running a 6 volt igntion with a resistor, you may need a better coil. myabe step up to the electronic conversion, they make them in 6 and 12 volt, and postitve and negative ground systems. I had SMTA in the shop for a dyno session last week, the owner has had it for years, and said the best has tuned it, I found him 5 more HP by rejetting the carb, went from 57 to 62, then I added our fuel, got him 66 hp. Far as I know it was a 264 engine. So, there is potential there!! I set the timing on the dyno, at full load 540. Tuning it by ear,,, to describe how it runs after,,, at idle, it sounds like it laboring just a tad. Like a car with an auto tranny sitting in gear. Tuning it to book specs, and it will sound very very smooth at idle. Its not much on the timing, set it at high rpms, till it sounds the best, then idle it back down, you will have to change your idle adjustments,,, speed,, mixture,, to compensate for the changes from the timing. Also, double check all your bolt torques on the manifold, you may have a different problem than what your trying to chase down. when you speed up the responce times in the engine, you have to compensate to compliment the changes, and understand what the changes are doing,, faster, will mean that its not stock, and stock jets, coils, wont do the job any longer. if what you did, changed that engine that much, then there is alot of power hiding in your SMTA, and never knew it was there. Hunt down the miss, check plugs for color, check coil for misfires, and think about rejetting your carburator. it wont take much,, On the SMTA in the shop,, it went up 6 jet sizes or drill bits from the origianl jet, the same larger bit was used to drill out the bottom 2 holes in the metering stem to get more through the stem, that makes a world of difference, Hope this helps,, ChadS
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