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#21
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You guy's aren't reading the early posts, it was a different carb for the E-85
and the plugs and AFR looked fine with the different carb on the E-85 thats why I didn't do any jet changes. on the other fuels the motor made best power @37* I found out why I was down on power from 3-years ago, It stated eating up the rod bearings well only two and I don't know why yet we are still checking what the problem might be I droped the rotating assm off this morning. Man I'm just having some real bad luck this go-a-round. when I find the problem I'll post it here. The mains look brand new still. GT |
#22
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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 |
#23
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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 |
#24
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Figured out the problem on the bearing issue.. To lite of an oil that I was using. I ran 5-quarts of conventional 10W30 with 2-quarts of 20-50.racing oil Just not enough cushion for the bearings and I turn down the oil pressure from 80-psi to 60-psi. going back to 80-psi on this motor and check clearances when I get the assembly home. The crank is now standard main- .010 on the rods and I will run a racing oil from here on out. A lesson learned for me here. your never to old to learn. I will try the E-85 again sometime later. GT |
#25
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What did you see that makes you think its too light of oil ?
What kind of main bearings are you using and did you line up the oil hole on the tab side of the bearing ? Reason I ask is, not having them line up is not going to effect the mains. It will effect the rods at high RPM. Its a old Whitmore trick he told me. I have always done this and never had a rod or main bearing issue. Ran a 60lb pump in a 455 for years. Lots of folks run 10-30 with 60lb pumps and do not have problems. |
#26
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Runing a race ingine with .0025 rod clearance and .0032 mains, 60lbs pump and comventional 10w30 oil doesn't give enough cusion for the bearings That was the first thing my machinest ask is what WT oil was I using. I here people saying they run lighter oils all the time but there not racing there motors like this one see's The main's are clevite rod's are king. GT |
#27
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The block has 3 holes that intersect on the mains. Of those 3 holes the one that gets the :shot" of oil is the hole on the "tab" side.
All my engines I drill a hole right through the main bearing in those locations . Then take a jewlers file and de bur. Its a old Dan Whitmore trick. He said if its not done your rods (6 and 4, maybe 2 ?) get starved of oil at high RPM. The Clevite style bearings are the worst with their round oil hole. Oil hits the back of the bearing, moves over and goes on through. Make it a straight shot. FM Race bearings with their slot are a little better but I drill them too. I have never hurt a main or rod bearing doing this. |
#28
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on the motor while it's down. Thanks. GT |
#29
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I never have understood why the bearing manufacturers don't make the bearing hole coincide with the main feed hole there -or slot it to encompass both holes.
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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 |
#30
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My stock block 468 we ran same clearances with 5/30 with different rods, now using molnar rods, its in the little details that make them live!
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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 |
#31
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I also always do the P Dude thrust bearing mod. |
#32
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A little more cushion than regular oil does. Thanks to every one for your information as your never to old to learn something new. GT |
#33
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The Following User Says Thank You to slowbird For This Useful Post: | ||
#34
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Kendall
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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 |
#35
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Where did cushion come from?Tom
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#36
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Racing oil has more of a cushion then conventional oil does not to mention all the other additives in the racing oil's
GT |
#37
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I have never heard of cushion with oil,the oil flos and cool and lubricates the bearing keeping metal from being against metal.Something new for me.Thanks,Tom
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#38
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I haven't taken the time to read completely through this thread so forgive me if this has already been posted. You say oil is spraying out the seal. That is unusual as when these seals leak I have never heard of one that leaked like that. Could this be due to excess pressure in the crankcase due to inadequate venting? My 455 engine is in the 650 HP range. I don't run a vacuum pump but I have a header evac system that works well. My BOP rear main seal has a slight drip it has for years but it not an issue. How is your engine vented?
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Tim Corcoran |
#39
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seal just the two spot's under each one (Two Piece BOP Seal) I can only think that it was pushing oil under the seal and flinging from the flywheel. But it must have a great deal of pressure to spry that much oil out. I run two PCV valves from baffled valve covers to the back of the intake. I think at around 6000 rpm's the pressure build's and blows past the seal. I have everything to install a vacume pump exp for the correct mandrell. The pcv works ok in the car but code be better, so I'll have to get it right. GT |
#40
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Tim Corcoran |
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