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backfire

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044mcmilt View Drop Down
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    Posted: April-15-2017 at 1:11pm
recently redid my entire 74 Nautique. 351 windsor changed to marine holley and added pertronics ignition. boat ran fine in drive. went to lake and 3/4 throttle backfired a lot and smoothed out at full throttle. when back home i notice boat has always had distributor 180 off along with wiring 180 off. boat always ran good this way. do you think this coyld be my issue or Carb? i should of done one change at a time but is ran so good in the drive i proceeded to finish whole motor. new fuel pump,wires cap and plugs.... any thoughts?
tom
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8122pbrainard View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote 8122pbrainard Quote  Post ReplyReply Direct Link To This Post Posted: April-15-2017 at 2:32pm
Tom,
What do you mean by the distributor being 180 off? An engine won't run if the firing order is 180 off. As long as you have the firing order correct referenced from the #1 TDC, you should be fine. Are using the correct firing order? Is the engine the original RR?

What did you do to set the float levels in the carb? Backfiring usually is a lean condition.

Why the Pertronics EI conversion?


54 Atom


77 Tique

64 X55 Dunphy

Keep it original, Pete
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TRBenj View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: April-15-2017 at 2:41pm
Don't look at carb, look at timing.
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