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#1
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Bearing oil hole size
This is a king main bearing. The oil hole looks very small. Should I enlarge it?
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#2
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No.
But let me ask this (1) are you assembling this motor for the last time (2) is this a factory block?
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I do stuff for reasons. |
#3
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Quote:
You are posting in the race section, so Lots and Lots of additional information is really needed to answer the question correctly. 1. Oil pump and pressure 2. small or large main bearings 3. RPM range 4. HP 5. Oil Clearances 6. Rotating weight 7. Restricted upper end? 8. Many other factors. |
#4
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I always wondered why they bearing hole is not centered on the block holes especially on performance bearings.
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
#5
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Sorry, should have been more specific. It’s for a 535 IAII aluminum block with fully ported Tiger heads. I have another engine just like it that I did enlarge the hole. I turn that engine engine to 7800 or so. It’s basically the same build but going in my other car. The hole just seems small and I don’t want it to be a restriction. The oil pressure on my other engine is fine and has given me no problems so far. 80 lb oil pump. Clearance around .003. 3 inch mains. Upper end is restricted. Scat crank Oliver rods.
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#6
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A tid bit concerning the IA2 block...
From this: http://www.allpontiac.com/online_cat...ding_notes.pdf CHECK ALL OIL PASSAGES AND DEBURR IF NEEDED GOODEXAMPLE, take note that the location where the oil passages intersect within the front main cap could use some attention. The depth where they intersect is not the same as a factory block, it's closer to the bearing. Similar situation on the three center mains. We cleaned up that area for improved oil flow. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#7
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Quote:
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#8
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In my post 6 I believe I now mis-spoke about it being closer to the bearing.
" take note that the location where the oil passages intersect within the front main cap could use some attention. The depth where they intersect is not the same as a factory block, it's closer to the bearing. Similar situation on the three center mains. We cleaned up that area for improved oil flow." It is defiantly different than my factory block on hand. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#9
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I have to do this to all my 113M bearings on my IA2
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
The Following User Says Thank You to grandville455 For This Useful Post: | ||
#10
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Agree on the 113M bearings on an IA II block. I do the same thing. With King and a hole, not slot, that doesn't seem to be needed. But certainly check. The entire bearing hole needs to be open to the block.
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#11
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Exactly what you do to a main bearing. Unless you like spun rod bearings.
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The Following User Says Thank You to Dragncar For This Useful Post: | ||
#12
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The problem is on a Pontiac the shot of oil comes from the oil hole on the tab side of the bearing. The oil flow has to hit the back of the bearing, move over and go through that little hole.
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#13
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Quote:
What did you end up doing? I spun a rod bearing at 12 passes. Sent from my iPhone using Tapatalk |
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