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Author
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Topic: rattling 466BBF
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Stang72
Gearhead Posts: 283
From: Arkel,Zuid-Holland,Holland
Registered: Jan 2003
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posted 09-12-2004 04:46 AM
   
A little while ago i asked advice about a rattling 466 at about 2500rpm.. clearly hearable from inside the car ,but outside you could barley hear it.. so we've , adjusted the valves, looked at leaking headers, ign. timing, my friend bought a stethoscoop ,..we found nothing,, except it came from cil no 3 and on you could here it on the header pipe,..but it didn't leak what so ever.. so, he had the engine-builder come over to have a look.. (my friend was on the edge of insanity  ) coz we were thinking about a spun main/rod bearing of such kind, but for that the engine was running to good..
that guy started fiddling around, and after a hour of try-ing all kinds of thing..nothing,..still the rattle... and then, in a sort of response he pulled the vacuumline of the distributor,..rattle gone.... it turned out the engine was pinging/knocking... the enginebuilder said (and i thinnk most of you agree) that a vacuumdistr. i fine for a streetengine,..with mild mods...nothing fancy.. but when it gets serious, dump the vacuumdist and go non-vac.. my friend has a engine you could hardly call streetable,..strip would be more accurate (dynosheets says 457hp on a 460 with stock heads)..so he converted his MSD to a non-vacuum dist,..and he is driven around very happy again!!!!!just thought i'd share this with you!! greetz Ben [This message has been edited by Stang72 (edited 09-12-2004).]
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steve'66
Gearhead Posts: 9489
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 09-12-2004 10:52 PM
Ben,I wholeheartably agree. When you get near 1 hp per ci it's time to lose the vac advance, actually I'd lose the advance all together and lock the timing out.  SteveW
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