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#1
10-19-2023, 01:33 PM
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Another problem found in dyno
First check out pull up to 5000rpm was good, oil pressure, temp and showed 495hp and 550tq at 4300. Oil and filter looked good too.
Oil pressure dropped gradually on 2nd pull and settled at 10psi on idle before shutting it off. Checked hot lash and all fine. Nothing in oil or filter. Took dizzy out and had no resistance from the pump when he tried his drill primer. He's going to check the pump tomorrow to see if there's anything inside or under the check ball. This is a new Melling 60lb pump that was inspected before use. Will also check the shaft too. Is there anything else to look for?
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69 Firebird 472, Bullet SFT, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 11.14@120 |
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#2
10-19-2023, 02:18 PM
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Are the front oil galleys drilled and tapped for pipe plugs? Or do you have the press in plugs? If press in, one could have popped out.
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62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs |
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#3
10-19-2023, 02:53 PM
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Wow that is a bummer. Usually the engines that put up the biggest fight turn out to have the best results. Hang in there. It looks like you have good folks working with you.
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#4
10-19-2023, 03:31 PM
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What Gary said for sure could be it. When we had my engine on the dyno made the first pull all went well but just before it was turned off I thought I saw the psi low. When he started it for second pull 10 psi so I thought it was going to be bad Jeff who did the pull said let me try something. We took out distributor and he spun it clockwise for a few seconds and then counter clockwise problem solved something had got into bypass. We went on to making more pulls. Not likely but the pickup could have come off could put a couple more quarts in it to see if psi comes up but would still need fixed. Good luck with yours.
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#5
10-19-2023, 03:40 PM
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From memory I think they are screwd plugs. He's going to check the pump tomorrow, I'll let him know to check if those front ones are plugged or not.
__________________
69 Firebird 472, Bullet SFT, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 11.14@120 |
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#6
10-19-2023, 04:45 PM
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What does the filter look like?Hate to think about it but might be loosing the engine.Tom
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#7
10-19-2023, 05:24 PM
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If you have a stock oil pan You do not need a pick up tube on a Pontiac pump to get oil in it if you have at least 4 Qt of oil in the pan.
Many motors run for decades like this when the pickup tube has come out.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#8
10-19-2023, 05:31 PM
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If there screw in plugs on the front that passenger side one can not be installed too deep of it will block a oil passage.
This is likely not going to make for low oil pressure, but it’s a failure in the works. Just check with your builder that he is aware of this if indeed screw in plugs where used.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#9
10-19-2023, 05:58 PM
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He said the filter was clean no debris. It's a Milodon 7qt pan. I'll have him check the plug.
Oil pressure was good on cam break in and ring seal. Was also good on the first 2 pulls too. Guess we'll find out tomorrow if the pumps at fault.
__________________
69 Firebird 472, Bullet SFT, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 11.14@120 |
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#10
10-19-2023, 08:46 PM
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I just finished a 535 build for a friend, it initially had very good oil pressure, then went to 10-15lbs once warmed up at idle. Pulled it back apart to find a hairline crack in the oil pump, right where the check ball seats bearings and clearances were good so we put in a new pump and it was good to go. The crack went from the check ball seats to the passage leading up to the block. I only caught it under a magnifying light. Good luck, I hope it an easy fix for you.
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#11
10-20-2023, 03:18 AM
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I hope it's that simple Scott. It's the no resistance when turning the pump with a primer that's the issue.
__________________
69 Firebird 472, Bullet SFT, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 11.14@120 |
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#12
10-20-2023, 05:11 AM
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Sounds like an oil pump issue. While your at it check the bypass on the oil filter housing. Make sure it's still ok.
__________________
68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
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#13
10-20-2023, 05:56 AM
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Drop the filter off and put a big catch pan under there close up.
Spin the pump and you should see a very large gush of oil come out, if so then chances are really high that the pump is good. I would still however at this point pull the pan.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#14
10-20-2023, 06:46 AM
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He's in the process of doing that now Steve. We need to check the pump anyway. The bypass has been blanked off.
__________________
69 Firebird 472, Bullet SFT, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 11.14@120 |
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#15
10-20-2023, 07:13 AM
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Why the hell with your type of build / power level would a pump mod like that need to implement?
Exotic mod’s lead to exotic failures from what I have seen too many times over the decades, especially in there first form before the bugs are worked out.
__________________
Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
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#16
10-20-2023, 07:18 AM
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I don't know but think it was done on the previous build and guess he's left it for this build.
Doing a search and several people do it as standard including Cliff. I don't know enough about the reasoning so leave it to the engine builders.
__________________
69 Firebird 472, Bullet SFT, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 11.14@120 |
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#17
10-20-2023, 08:32 AM
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#18
10-20-2023, 08:47 AM
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Update. Builder found a piece of casting on the check ball. Cleaned it out, span it up and went to 60lb. Don't know how it got there, I took the new pump apart before dropping it off to him.
__________________
69 Firebird 472, Bullet SFT, KRE 85cc, Victor, 850xp, TH400, TSP 9.5" 4800, 3.90 10 bolt, Viking DA rears, QA1 single fronts, 3558lbs. best to date 11.14@120 |
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#19
10-20-2023, 08:35 PM
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Quote:
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#20
10-20-2023, 10:13 PM
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