block rear oil mod, learn from my mistake
01-19-2011, 07:03 PM
#61
I dont want to start a new thread and this may not be the place but it this the "oiling issue" associated with 97-98 ls1s. I currently have one at the machine shop and i am very interested in doing this mod. I have a few questions.....
again, Is this THE oiling issue associated with the 97-98 blocks?
Have you guys decided that it is best to modify just the block, just the cover or both?
How deep should the channel in the block be?I understand about the depth in the cover i think(only as deep as the factory points just all the way across)?
If this isnt the issue of the 98 blocks what is. I want to fix it if i can.
Thanks a ton!
again, Is this THE oiling issue associated with the 97-98 blocks?
Have you guys decided that it is best to modify just the block, just the cover or both?
How deep should the channel in the block be?I understand about the depth in the cover i think(only as deep as the factory points just all the way across)?
If this isnt the issue of the 98 blocks what is. I want to fix it if i can.
Thanks a ton!
01-19-2011, 11:46 PM
#62
Just doing the cover should add 20% more volume, across this transfer channel, and is far safer than risking the block. Plus you can always go back to stock, in case you ever think of a reason to do so. Just replace the rear cover.
I don't have the answer to your other question.
I don't have the answer to your other question.
01-20-2011, 01:37 AM
#64
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Hello poeple , why not just port out the aluminum cover instead ? It's aluminum as already stated and has plenty of extra material and if You were to screw it up it would'nt be nearly the large problem that screwing up the block would be and it would be easier to clamp guides to the cover ???
01-20-2011, 08:12 AM
#66
I actually know some race shops that block that side back off on the ones with the channel cut bigger back there!
They want to keep primary oil pressure going to the crank first but yes those lifters on that side get more oil pressure.
Maybe VVT and DOD need more oil pressure to that side so they complete the oil into a ring front and back like this so oil can come from both sides and have the slightly higher vol pump too.
I just leave it all alone and never ever see any problems anyway.
They want to keep primary oil pressure going to the crank first but yes those lifters on that side get more oil pressure.
Maybe VVT and DOD need more oil pressure to that side so they complete the oil into a ring front and back like this so oil can come from both sides and have the slightly higher vol pump too.
I just leave it all alone and never ever see any problems anyway.
I mean come on, it take minutes for the oil to get to that side. 35% of my business last year was replacing passenger side components in the earlier motors due to lack of oiling. 
LOL!!!
01-20-2011, 11:05 AM
#68
What are you talking about erik, you've never seen the countless number of pass. side cylinder head and valvetrain failures due to lack of oiling????? I mean come on, it take minutes for the oil to get to that side. 35% of my business last year was replacing passenger side components in the earlier motors due to lack of oiling. LOL!!!
I mean come on, it take minutes for the oil to get to that side. 35% of my business last year was replacing passenger side components in the earlier motors due to lack of oiling. LOL!!!
01-20-2011, 11:16 AM
#69
rear channel The depth I machine the rear channel to in the block is .400". You won't be able to get anywhere near that cross sectional area by machining the cover alone.
The rest of the oil passages in these blocks are identical to later blocks as far as I can see.
Steve
The rest of the oil passages in these blocks are identical to later blocks as far as I can see.
Steve
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Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
Steve Demirjian
Race Engine Development
Oceanside, Ca.
760-630-0450
web: www.raceenginedevelopment.com/
e-mail: race-engine-development@***.net
01-20-2011, 02:51 PM
#70
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What are you talking about erik, you've never seen the countless number of pass. side cylinder head and valvetrain failures due to lack of oiling????? I mean come on, it take minutes for the oil to get to that side. 35% of my business last year was replacing passenger side components in the earlier motors due to lack of oiling. LOL!!!
I mean come on, it take minutes for the oil to get to that side. 35% of my business last year was replacing passenger side components in the earlier motors due to lack of oiling. LOL!!!
Yeah, I'd just leave it the hell alone. I see far worse problems by people hacking at their blocks with a dremel then "oil" issues. Regardless if it does take a little longer for oil to get to that side at idle as soon as you increase RPM/Pump flow that is going to change completely.
01-20-2011, 08:05 PM
#72
You can't double the depth of the channel, but if you could, you'd have 4x the volume, not just twice the volume.
You can't go any deeper, because you don't want to make the thin part of the cover any thinner. Trying to go double would break clean through.
Clean the old cover and the old gasket, plus the old bolts, then use the bolts to align the gasket to the cover. Then use a Sharpie to trace the gasket.
You can take the lines, but that's it. No farther.
You can't go any deeper, because you don't want to make the thin part of the cover any thinner. Trying to go double would break clean through.
Clean the old cover and the old gasket, plus the old bolts, then use the bolts to align the gasket to the cover. Then use a Sharpie to trace the gasket.
You can take the lines, but that's it. No farther.
01-20-2011, 08:27 PM
#74
this is neat to see. i like the trial and error approach with pictures. great information.
however; this looks like a recipe for oil starvation. that's great the ported pump will move tons of oil and now your passages will, too, but...oil needs to return equally as fast to be useful.
i really don't understand how the passenger side of the valvetrain could lack oil for minutes on startup (repeatedly) and not make a sound or give any problems (or even a hint of such) for hundreds of thousands of miles. i fail to see this logic.
however; this looks like a recipe for oil starvation. that's great the ported pump will move tons of oil and now your passages will, too, but...oil needs to return equally as fast to be useful.
i really don't understand how the passenger side of the valvetrain could lack oil for minutes on startup (repeatedly) and not make a sound or give any problems (or even a hint of such) for hundreds of thousands of miles. i fail to see this logic.
01-21-2011, 10:31 AM
#75
What logic? Open up the passenger side valve cover, start the car & see for yourself. It's not a guess, it's fact.
01-21-2011, 10:44 AM
#76
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Fear. If people don't see oil splashing around they think somethings wrong when in fact things are just fine. Obviously the lifters have to have oil or the damn thing wouldn't run... hehe
01-21-2011, 10:47 AM
#77
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You could run the damn engine without oil for a few mintues and the valvetrain (put solid lifters in it so you don't have to worry about the lifters pumping up) would be fine. The Main/Rod/Cam bearings would be the first to fail.
Your looking for a problem where there isn't one. There have been enough 7,500rpm plus screaming LSX engines in the last 13 years that have done fine without this mod.