Your donations help keep this valuable resource free and growing. Thank you.
|
Another Oil Viscosity Discussion |
Post Reply | Page <1 234 |
Author | |
Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
Post Options
Thanks(0)
|
Thanks for the info guys. I was looking through the old Performance American Style yesterday. I'd classify my engine as Mode 3 "Way Out". The clearance numbers Red Devil provided are very similar to that using the extra 0.0005" for high performance. Years ago I had an engine eating cam bearings due to excessive clearance on the mains. The bearing manufacturer provide the wrong clearance information and they were set between 0.0035" and 0.0040". Since I'm using s centrifugal blower it might make sense to use a bit extra clearance on #1. My engine builder is recommending 0.0025" on the mains. As tight as the bearings were on my engine #3 and #5 appear to be perfectly okay as were the rod and cam bearings. My best guess would be to go with 0.0030" on #1 & #5, 0.0025" on #2, #3 and #4. Probably stay with the 10W30 Valvoline VR1 oil to keep the dizzy gears happy. -Steve- |
|
Hurst390
AMC Addicted Joined: Apr/20/2008 Location: secret Status: Offline Points: 5752 |
Post Options
Thanks(1)
|
Straight 30 vr1 here
Lets start at the beginning. Was a drill bit ran through the oem main feed holes? I have yet to find a block that has been completely drilled through from the factory. Yeah wtf is PO?
|
|
SC/Hurst Rambler
11.62 120 100% Street Legal |
|
Rebel Machine
AMC Addicted Joined: Jul/03/2007 Location: Western Il Status: Offline Points: 5118 |
Post Options
Thanks(0)
|
I'll have them double check that.
|
|
Trader
AMC Addicted Joined: May/15/2018 Location: Ontario Status: Offline Points: 6762 |
Post Options
Thanks(0)
|
PO - Personal Opinion
Must be a foreign thing! Just like NFG -, Operating Engineers used that all the time decades ago, Not Functioning Good. Believe there is a different meaning now.
Edited by Trader - Dec/03/2022 at 7:59am |
|
Red Devil
AMC Addicted Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
Post Options
Thanks(1)
|
My
understanding is it accounts for additional crankshaft deflections due
to the mass-moment effects of the counterweighted flywheel / flexplate
plus clutch assembly / torque converter that lead to early rear main
issues when all bearing clearances were the same. The crank journals should be machined to specs, i.e. rear journal nominal 0.001" smaller than 1-4. Now
that assumes stock reciprocating assembly and stock flywheel &
clutch assembly or flexplate and torque converter assembly and stock
front dampener. Once you deviate significantly from stock, then changes
may be needed to suit the application and new build. If
you are breaking new ground with your build, then it may take several
tries to get things right. Frequent tear-down and inspection is likely
in order. Hence, why often easier long
term to transplant a known engine combination for racing. Kudos to
those that stick with AMC and work it out. RD.
|
|
Post Reply | Page <1 234 |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |