Hello, I am new to this forum. I am looking for some suggestions on my issue.
I have already pulled my engine once, and am getting ready to do so again ?? maybe
I have looked for information, but to no avail. I have looked in the archives, and have found nothing.
Any help would be greatly appreciated
okay so for the background,
this is for a circle track dirt car, we have 15 lb@ 1000 inch vacuum rule, no aluminum anything, and no headers.
now for the parts
i have a fresh, (now with about 45 minutes of run time)
clearanced, decked, and line bored 400 .030 over (406)
6 in crower rods, 4340 internally balanced crank, kb hypers,
fully balanced rotating assembly
GMPP cast iron intake P# 14097499 (steel rules)
comp cams xtreme energy 268h grind 224/230 (vacuum rules)
stock distributor
modified vortec heads
hv oil pump, steel sleeved oil pump pushrod.
the engine developed what sounded like a rod slap, after only 45 minutes to an hour. so very little running time; only cam break in, and a trailered trip to the glass pack (more rules ) and alignment shops.
so i tore it all down, all tolerances were perfect, piston walls looked great. But there were the dreaded metal shavings. the distributor gear was wearing very badly (not touching the top and grinding more and more to the bottom) and the very end of the oil pushrod shows some twisting type wear, so we talked it over with some fellow racers and thought that the cam was more than likely walking. so i installed a cam button, replaced the gear with a bronze one. i replaced all of the bearings, and replasti-guaged everything. I considered myself lucky we caught it.
upon firing it up to time it, it seemed to make the similar noise again. the distributor was a little looser than it should have been to time it; but it popped up. NOT spinning a little, but popped up.
Just as if it were hitting the bottom or just getting enough to nip the metal. the wierd thing is that oil pressure is steady 60 lbs at idle, 80 - 90 at mid rpms, say 3500.
i have ideas going through my head like maybe it is the line bore, i had to get a special timing chain for that...
or maybe the decking of the block changed the distributor insert depth...
or could the intake be special in some way
or could the oil pushrod length be wrong?, are there even different size oil rods?
what is the sound, i am obviously having issues if i have filings in my oil??
help please i am drowning
:sweat:
Brian
I have already pulled my engine once, and am getting ready to do so again ?? maybe
I have looked for information, but to no avail. I have looked in the archives, and have found nothing.
Any help would be greatly appreciated
okay so for the background,
this is for a circle track dirt car, we have 15 lb@ 1000 inch vacuum rule, no aluminum anything, and no headers.
now for the parts
i have a fresh, (now with about 45 minutes of run time)
clearanced, decked, and line bored 400 .030 over (406)
6 in crower rods, 4340 internally balanced crank, kb hypers,
fully balanced rotating assembly
GMPP cast iron intake P# 14097499 (steel rules)
comp cams xtreme energy 268h grind 224/230 (vacuum rules)
stock distributor
modified vortec heads
hv oil pump, steel sleeved oil pump pushrod.
the engine developed what sounded like a rod slap, after only 45 minutes to an hour. so very little running time; only cam break in, and a trailered trip to the glass pack (more rules ) and alignment shops.
so i tore it all down, all tolerances were perfect, piston walls looked great. But there were the dreaded metal shavings. the distributor gear was wearing very badly (not touching the top and grinding more and more to the bottom) and the very end of the oil pushrod shows some twisting type wear, so we talked it over with some fellow racers and thought that the cam was more than likely walking. so i installed a cam button, replaced the gear with a bronze one. i replaced all of the bearings, and replasti-guaged everything. I considered myself lucky we caught it.
upon firing it up to time it, it seemed to make the similar noise again. the distributor was a little looser than it should have been to time it; but it popped up. NOT spinning a little, but popped up.
Just as if it were hitting the bottom or just getting enough to nip the metal. the wierd thing is that oil pressure is steady 60 lbs at idle, 80 - 90 at mid rpms, say 3500.
i have ideas going through my head like maybe it is the line bore, i had to get a special timing chain for that...
or maybe the decking of the block changed the distributor insert depth...
or could the intake be special in some way
or could the oil pushrod length be wrong?, are there even different size oil rods?
what is the sound, i am obviously having issues if i have filings in my oil??
help please i am drowning
:sweat:
Brian