Building a 98' Block What oil pump?
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From: Detroit, MI - Camp Pendleton, CA
Building a 98' Block What oil pump? I know 98' blocks have confirmed oiling problems. I didnt know this until later on when I started studying LSx engines more. I have a 98' block I am building myself due to a spun rod bearing. Will a ported LS6 pump be sufficent enough to cure the 98' problem? I would hate to finish the engine only to spin another bearing. Any cures or tips for these 98' problems? Thanks!
-Alex
-Alex
You have misinformation. The 98 block doesn't have an oiling problem. It's the stock oil pump. Simple fix is you get a ported ls6 oil pump (got mine from Texas Speed). The 98 block can't be bored out past .005" but that's about it. So you are good to go.
Put good bearings and rod bolts in it and you should be good to go to 7500rpms.
Put good bearings and rod bolts in it and you should be good to go to 7500rpms.
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From: BFE
I do not quite agree on the 7500 rpm bit.
98 blocks have been revised to facilitate oiling passage functions, they were found to suffer from high rpm oil starvation on the crank and rod bearings.
Unless you are doing an all out race motor, then rebuilding your 98 should be fine.
98 blocks have been revised to facilitate oiling passage functions, they were found to suffer from high rpm oil starvation on the crank and rod bearings.
Unless you are doing an all out race motor, then rebuilding your 98 should be fine.
Originally Posted by 777
You have misinformation. The 98 block doesn't have an oiling problem.
When looking at the back of the bare block you can clearly see the difference between the two. Looking at the lifter galley holes on the early block you can see they are flush with the block itself. On the later blocks the holes are located in a deep crossover "pocket" which is cast into the block (the early block galley holes were drilled). This allows much better oil flow from the left galley to the right to prevent oil starvation at high, sustained rpm's.
I found this link (excellent source of Gen III tech info) with some pictures to help out. Scroll down and you will see exactly what I'm talking about.
http://www.automotiverebuilder.com/ar/eb040538.htm
FWIW - I always ran 6 quarts of oil at the track to prevent oil starvation at WOT. If I didn't the oil pressure would drop dangerously low to around 20 psi because the oiling system simply couldn't flow the oil fast enough. A ported oil pump did little to change this.
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I have a 98 block and the rear oil passage was ported to allow better flow to the opposite bank. The block is not here with me but I'll try and post up a pic later this week. I plan to run 6qts. in mine as well.
I have a melling HV oil pump for mine I just hope it clears the Rollmaster dual roller.
I have a melling HV oil pump for mine I just hope it clears the Rollmaster dual roller.
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From: Detroit, MI - Camp Pendleton, CA
Thanks for the response guys. I am using Clevite-77 P bearings and plan on using a Lingenfelter LS6 ported pump. Is that a good pump choice? All clearances have been checked and are within spec. Its going to be driven a couple of times a week with a F14 cam, not a big race engine, just a fast street car. How hard is it to port the rear of the block? Any other tips?
-Alex
-Alex
Originally Posted by BlkHwk
I have a 98 block and the rear oil passage was ported to allow better flow to the opposite bank. The block is not here with me but I'll try and post up a pic later this week. I plan to run 6qts. in mine as well.
I have a melling HV oil pump for mine I just hope it clears the Rollmaster dual roller.
I have a melling HV oil pump for mine I just hope it clears the Rollmaster dual roller.
I would be very interested in pics also.
Originally Posted by BlkHwk
I have a 98 block and the rear oil passage was ported to allow better flow to the opposite bank. The block is not here with me but I'll try and post up a pic later this week. I plan to run 6qts. in mine as well.
I have a melling HV oil pump for mine I just hope it clears the Rollmaster dual roller.
I have a melling HV oil pump for mine I just hope it clears the Rollmaster dual roller.
i recently tried installing the Rollmaster Adjustable Dual Roller Timing Chain and the Melling HV/HP Pump. i couldnt find a way to make the pump clear the chain while still fitting under the front cover. i tried grinding down the part #'s which were on the chain side of the pump and more shimming but the setup would not work for me.
maybe u will have better luck, but take my advice and if it doesnt fit right away dont try modifying it to make it fit so u can still return it. i went with a ported LS6 pump.
Originally Posted by jdustu
i didn't take any chances and went with a katech blueprinted ported and polished ls6 pump.....only a few bucks more than a new gm ls6 pump
Great pressure with the reliability of Katech
Rear Oil Passage Just got back with the pics. Came out kinda fuzzy. I was told I should apply some sealer to make sure it seals.
We're gonna try the Melling pump tomorrow if we can't make it work I'll go with the LS6. I was afraid we were gonna have probs with it. Thanks for the info on prev. attempts @ intalling the Melling pump.
We're gonna try the Melling pump tomorrow if we can't make it work I'll go with the LS6. I was afraid we were gonna have probs with it. Thanks for the info on prev. attempts @ intalling the Melling pump.
Last edited by BlkHwk; Aug 31, 2006 at 06:49 PM.
Staging Lane
Joined: Dec 2004
Posts: 99
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From: Chesapeake, VA
I went with the LS6 ported oil pump on mine and it seems to work just fine. I run mine to 6800rpm's with no oil pressure loss so as long as your not looking to build a 600HP motor or doing auto cross where you are staying way up there in the rpm's for long periods or time, the 98 block should work just fine. Just my 2cents.
On The Tree
Joined: Aug 2002
Posts: 172
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From: Michigan
hey alex what's up, this is kevin with the black SS. I came to your shop a week ago cause I broke my rearend and am doing heads and cam....I ended up going with monkey wrench to do the install...we should go cruisin some time, i will have the car back in a few weeks.