[Shotimes] rod bearings

[James F. Ryan III]

>Trying to accelerate from too low of an RPM, rather than downshifting to
>raise the RPMs.

>Large throttle input at low rpm puts a lot of pressure on the rod
>bearings when oil pressure is low.

>The engine doesn't have enough interia to keep it spinning
>which causes the rods to hammer the crank as the plugs fire.


What about pick-ups that tow a heavy trailer, or driving up a long hill, or
driving up a long hill while towing a trailer, or cars with auto trans (that
are notoriously in the wrong gear - esp torque conv lock-up)?  Why do I
never hear of rod bearing problems with these vehicles?  What about the big
diesel rigs?  They have high commpression engines AND pull heavy loads.
Wouldn't every compression and power stroke put tremendous pressure on the
rod bearings?  What about dump trucks?  Those guys seem to always lug (and
buck) their engines yet I see an awful lot of very old Mack and Autocar dump
trucks on the road every day.

Also, why don't we hear about Mustang 5.0 owners and their rod bearing
failures?  If what you're saying is true wouldn't a higher horsepower/torque
engine put more pressure on the rod bearings esp if you lug it?


Jim Ryan
Wayne, NJ
'91 PLUS - all white/mocha with fiberglass hood, rod shifter, & rear spoiler

255 Lph fuel pump, SHO Shop can & horn, 80mm MAF, S&B cone filter, SHO Shop
HiFlow Y-pipe & cat-back exhaust, SHO Shop LPM, SHO Shop underdrive pulleys,
SHO Shop HiRevs Jr clutch & steel billet LiteWeight flywheel, reinforced
engine & trans mounts, SHO Shop TQ limiters, SHO NUT aluminum SFBs, FPS '96
SHO front brakes, Carbotech F brake pads, Nook's full-body SFCs, Koni adj
struts, SHO Shop linear springs, 24mm FSB, 26mm RSB, SHO Shop steel f&r
STBs, Bridgestone Potenza RE-730 225/55-16, CATZ MSP fog lights, police
grille



>-----Original Message-----
>From: shotimes-admin@autox.team.net
>[mailto:shotimes-admin@autox.team.net]On Behalf Of Justin Schick
>Sent: Wednesday, August 13, 2003 11:15 AM
>To: shotimes@autox.team.net
>Subject: Re: [Shotimes] rod bearings
>
>
>Trying to accelerate from too low of an RPM, rather than downshifting to
>raise the RPMs.
>
>
>Justin Schick
>silver 92 SHO in KC MO
>194k and counting quickly
>
>>>> "Carl Prochilo" <gr8sho@prochilo.myserver.org> 08/13/03 10:11AM
>>>>
>What does "lugging" the engine mean?
>
>Cheers,
>Carl Prochilo
>92 Ultra Red Crimson
>
>>  Not everyone believes that lugging the engine kills the rod
>bearings.
>> Lugging the engine on a worn
>> engine will sometimes make the oil pressure light flicker at near
>stall
>> speed, but that's just showing you the condition of the lubrication
>> system.
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