holley #90 jets too big!
Thread Starter
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
holley #90 jets too big!
well i installed the holley 90 main jets as per the oiling mod instructions. they helped a lot but still way to much oil. i have switched to 54 size jets the oil flow is reduced but still a lot of oil. it is running 100 psi on cold starts and is idling with 55-65 hot. should i ditch the high volume high pressure pump?
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Really the purpose of the Holley jet mod was never to eliminate oil flooding in the head. It was to reduce the amount of oil going to the heads at WOT, so as to increase the amount going to the bottom end.
How is the condition of your rocker shafts and rockers? Too big of clearance between the rockers and rocker shafts will cause oil flooding.
How is the condition of your rocker shafts and rockers? Too big of clearance between the rockers and rocker shafts will cause oil flooding.
Post Fiend
Joined: Mar 2004
Posts: 6,056
Likes: 8
From: Union, Washington
Never ever run a high pressure pump, thats your real problem. High volume is a different matter. I like the high volume pumps, some don't. I think a lot of oil is good, a lot of pressure is bad.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
Just change out the high pressure spring with one from a standard pressure pump, reinstall the high volume pump. Is this a brand new Mellings pump? Did you go thru it and blueprint it? I have 3/8" allen grub screws that were annealed then drilled .058", they screw into the heads that were tapped under the rocker stands. No problems with plenty of oil as I run FPP rockers rebushed with oillite, no bleeding bushings but the roller tips have plenty of oil.
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Thread Starter
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Fleet Owner
Joined: Jan 2004
Posts: 26,007
Likes: 575
From: Brentwood,CA
changing the pump is no small task. so i am really bummed i have to do it. i have to pull the engine to get to it.
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Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
Same here should I have to get inside, 391 pan, rear pickup with windage tray.
A snowball chance to just seal it up without leaks even if the pan could be removed in the truck. 235K in the 69 now in the 68 CS.
19 years ago on this 414 build with a Mellings HV pump from new had almost .0023" difference between driven and drive gear. Between body and gear end clearance was .004" plus difference in taper. As you see gears needed to be hand lapped as well the body, heck the cover had nicks that needed lapping also. Trust no one even new parts. My used C-6 trans pump gears have better tolerances and finish than new replacements. My transmission friend retired last year and for the last 5-10 years qualty control on replacement parts have been going down hill.
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A snowball chance to just seal it up without leaks even if the pan could be removed in the truck. 235K in the 69 now in the 68 CS.
19 years ago on this 414 build with a Mellings HV pump from new had almost .0023" difference between driven and drive gear. Between body and gear end clearance was .004" plus difference in taper. As you see gears needed to be hand lapped as well the body, heck the cover had nicks that needed lapping also. Trust no one even new parts. My used C-6 trans pump gears have better tolerances and finish than new replacements. My transmission friend retired last year and for the last 5-10 years qualty control on replacement parts have been going down hill.
.....=o&o>.....
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Lead Driver
Joined: Apr 2001
Posts: 6,175
Likes: 21
From: Texas
I thought the FT pan was about the same depth as the front of the 2wd standard pan over the cross member. if so, you can unbolt the motor mounts, hoist engine as high as possible with a cherry picker, loosen the pump bolts, drop pump into pan and remove the pan. It's a pain getting the bolts back in on the pump but I've done it a couple of times (again, that was before the FT pan, but I thought they were the same height). Make sure to wedge something between the engine and the mounts in case the hoist fails. You don't want to squash your paw in there.
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
The only real issue with HI pressure is wearing the dizzy gear from the excessive torque it exerts trying to spin the pump. HI volume does the same thing. You'll tend to break the roll pin on gear too if you street drive it alot. Been there, done that. Put dizzy in vise, rotate pin 90 degrees and drill another one above/below stock one. Install another pin and then don't worry about it. You are basically "wasting" HP by making all this added oil pressure that is not needed.
If you're still getting too much oil, put even smaller jet. What's the real issue? You are just making more oil stay in lower end. If the #54 is too big, try smaller and drive it. The balance here is to get enough oil to the parts that need it to survive. You've overdone it a bit and now you need to make adjustments to compensate. Pulling the pump is the real fix, but not a necessity in my opinion.
But, what do I know? LOL!
If you're still getting too much oil, put even smaller jet. What's the real issue? You are just making more oil stay in lower end. If the #54 is too big, try smaller and drive it. The balance here is to get enough oil to the parts that need it to survive. You've overdone it a bit and now you need to make adjustments to compensate. Pulling the pump is the real fix, but not a necessity in my opinion.
But, what do I know? LOL!
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
Originally Posted by ford390gashog
the oil comes out the tips of the rockers. i will swap out the oil pump and report back. when i built it the lower end had .003 in clearance so its a little tight.
I dont think the high pressure pump is helping matters at all. The more pressure you have, the more oil is going to flow through a given size hole. It's as simple as that. Like they said above, you can either make the hole smaller or lower the pressure.
Logistics Pro
Joined: Oct 2005
Posts: 3,785
Likes: 4
From: Mddl A MexCans
I like gtex also think the pump can be removed with the engine hoisted. I did mine that way...had to put the fron bolt in the pump then push the pan in, then the second bolt, tighten both...put the pan on...MAJOR PITA!! But it worked...If I had to do it over I'd just jerk the engine...saves on a lot of explicitives..LOL
Lead Driver
Joined: Jan 2003
Posts: 9,893
Likes: 12
From: Ohio
With that much clearance, a HV pump is better IMHO. A stocker might have only .002 oil clearance, but with more clearance, more oil is needed.
I'd leave well enough alone, put smaller restrictor in head and run it!
I'd leave well enough alone, put smaller restrictor in head and run it!