aftermarket rods question / modification
06-10-2008, 02:42 AM
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aftermarket rods question / modification what do you guys think , would it be nessesary to install these cuts in the h-beams too ?
I allready installed oil squirters too.
(it's for a non ls1 engine as you might have guessed)
thanks, Jeejee
I allready installed oil squirters too.
(it's for a non ls1 engine as you might have guessed)
thanks, Jeejee
06-10-2008, 10:17 PM
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What's the application?
AMC 258's and Jeep 4.0's have a small chanel cut into the rod cap which sprays the major thrust side of the bore with oil as the engine turns and helps keep the bores from oblonging.
AMC 258's and Jeep 4.0's have a small chanel cut into the rod cap which sprays the major thrust side of the bore with oil as the engine turns and helps keep the bores from oblonging.
06-11-2008, 05:58 AM
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The folks at BMW aren't idiots when it comes to engines, I'd say it might be a good idea to put that in the new ones as well. Is it on both sides of the rod or just one?
Then again, if you have installed under piston oil squirters when there wasn't any this might be redundant and a bit of a waste of good oil pressure. It would be nice to find a definitive answer as to what BMW's purpose was. In the AMC/Jeep example above, we have an idea of the OEM's intended function of the groove. On the big old Oldsmobile engines Mondello insists that the rods having a groove directly in line with the beam make the difference between the engine living and dying.
Dang, the OEM rods look pretty meaty. I am surprised they need to be upgraded..but looks can sometimes be deceiving. Should be a wicked lil engine.
Then again, if you have installed under piston oil squirters when there wasn't any this might be redundant and a bit of a waste of good oil pressure. It would be nice to find a definitive answer as to what BMW's purpose was. In the AMC/Jeep example above, we have an idea of the OEM's intended function of the groove. On the big old Oldsmobile engines Mondello insists that the rods having a groove directly in line with the beam make the difference between the engine living and dying.
Dang, the OEM rods look pretty meaty. I am surprised they need to be upgraded..but looks can sometimes be deceiving. Should be a wicked lil engine.
06-11-2008, 07:09 AM
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the standard rods are pretty strong, they are forged and should be able to withstand about 700-750rwhp, the goal is around that area, but i'd rather be safe then sorry
i'll have to check , but i think the cut is on both sides.
i guess if it wasn't nessesary bmw would not install these grooves
i'll have to check , but i think the cut is on both sides.
i guess if it wasn't nessesary bmw would not install these grooves
06-13-2008, 06:14 AM
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6 / 8 / 10?
It looks pretty obvious to me that these are "informal" piston squirters, although they may have some affect on bore wall lubrication as well. They should be always pointed pretty much at the piston.
If you've installed dedicated piston squirters, then those grooves would be redundant.
Machining them into the new rods just might be detrimental, in terms of fatigue crack propagation. Can you polish or re-shot peen the new rods after you make the cuts?
It looks pretty obvious to me that these are "informal" piston squirters, although they may have some affect on bore wall lubrication as well. They should be always pointed pretty much at the piston.
If you've installed dedicated piston squirters, then those grooves would be redundant.
Machining them into the new rods just might be detrimental, in terms of fatigue crack propagation. Can you polish or re-shot peen the new rods after you make the cuts?
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06-14-2008, 02:50 AM
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ah okay that was you ment with 6,8,10
it's for the 6, the 3.8 evo (347hp) version
i spoke to a guy wo runs a 2.3 m3 turbo engine which is basically the same just missing 2 cylinders, and he was running a little over 800HP without these cuts in his rods, so i guess with 50% more engine, i'll be fine for about the same amount of power
it's for the 6, the 3.8 evo (347hp) version
i spoke to a guy wo runs a 2.3 m3 turbo engine which is basically the same just missing 2 cylinders, and he was running a little over 800HP without these cuts in his rods, so i guess with 50% more engine, i'll be fine for about the same amount of power