04-20-2017, 01:24 PM | #1 |
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N20 Rod replacement only?
So been looking into all the power mods for our N20 and it's evident... we have rod issues, oil starvation on high G turns if tracking the car and the timing chain etc. But as for power and to fortify the bottom end for a daily rip around the city car, I want to see if there is a possibility to just upgrade the rods, bolts and bearings as they are the weak link in this motor. Yes, I know we can buy a full on out pistons and rods etc but that is expensive and time consuming process and requires engine to come out, so for most this is out of the equation! But what about just replacing the rods, can be around $1K and requires only the removal of the oil pan. Much cheaper alternative than a 6K + engine build.
Why haven't companies done rod replacements that are "Drop In Ready" so no balancing of the internals needs to be done? This would surely give a piece of mind and a far cheaper alternative than fully rebuilding the motor for someone who just wants mid to high 300's for a daily, right? I know AWE and others made "Drop In Ready" rods for VW and Audi market etc. Why not see if this is possible for the N20? Most will not push more than 400 WHP on the Stage 2 Turbo's (rated to 380WHP) and would open the market up for bigger HP on these 4 cyl motors if price was cheaper to fortify the bottom end. Or is the block not accessible to replace the rods without taking it completely apart? Just a thought and lets see what some of these big name companies/ vendors can chip in on this subject! Last edited by D041987; 04-27-2017 at 12:54 PM.. |
04-21-2017, 07:56 PM | #2 |
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We're all waiting on a response ?
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04-23-2017, 05:20 AM | #4 | |
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Can you link to these "issues" you claiming? Or are these one or two hit wonders with no history of maintenance? |
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04-23-2017, 07:59 AM | #5 | |
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04-24-2017, 01:00 PM | #6 |
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Not trying to be that guy but honestly this si for the true car enthusiasts that want to have something different and work with the platform they bough/ can afford/like. Please don't post on here with a suggestion to get a different car. If anyone of us could afford an M3 we probably would have gotten it in the first place! And M3's have rod bearing and other failures as well.
As for the issues with the 4 banger motor. They are VERY known issues! They have been posted a lot on this form from lot's of members and any BMW shop that deals with these motors you go to will agree and say the same about the bottom end being weak with timing chain issues being present. Mainly evident on 2012 to 2014 but seems less and less lately though. As for the bearings that is a given. You will always want to mic and measure and install new bearings with the rods. But I am looking to see if/why this has not been an option or if the market is just not big enough for manufacturing yet or if the motor is just a PIA to work on and requires full disassembly, in which case not worth doing just the rods. Last edited by D041987; 04-27-2017 at 01:01 PM.. |
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04-25-2017, 07:37 PM | #7 | |
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The cost (labor + parts) of reinforcing the engine and then the potential cost of a replacement engine ($13,000 for a brand new short block) is extremely high. I am willing to bet that if you experience a catastrophic engine failure due to increased power levels, the total cost of your car + modifications + replacement engine will greatly exceed the cost of an M3. |
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04-27-2017, 12:21 PM | #9 | |
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Last edited by D041987; 04-27-2017 at 01:07 PM.. |
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04-27-2017, 02:16 PM | #10 |
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Good idea, but it is not always about rods, check this thread
http://www.2addicts.com/forums/showthread.php?t=1149005 I get what are you trying to say and if can be done under 1.5k than maybe it is worth it. But still I'm not sure if that guarantees prevention of engine failure and potential rebuild. |
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04-27-2017, 04:34 PM | #11 |
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04-27-2017, 04:37 PM | #12 | |
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04-27-2017, 04:43 PM | #13 |
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BMW could void warranty if they found out that car has been on track day. There were cases, even on forum, were people had to go to court in order to get engine replaced by BMW dealer.
So in that case you if you plan to track your car I think it's better to have some money aside just for the worst case scenario. And if that happens it is alot more expensive to rebuild M3 than than it is for tuned 228i. I get your point, but still think that they are different league in terms of finances. |
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04-27-2017, 05:54 PM | #14 | |
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It's far easier to deny a warranty at the dealer level due to evidence that powertrain modifications may have contributed to the significant warranty claim. The physical evidence is essentially in the dealer/BMW's possession. It doesn't get easier than that. |
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04-27-2017, 06:08 PM | #15 |
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People who will want to do this do not care about warranty, the car will usually have Full bolt on Mods and bigger turbo's. So no need to discuss about warranty info on this subject and in this post! It's gonna turn into a speculation of what if's and that. But just as anything Dealer, they will deny coverage if engine goes and they check inside. Plain and simple just like any mod will void warranty. So take it at your own risk so end of warranty discussion.
Also as for that thread above. The guy was running a JB4 ONLY! With full bolt on mods and an upgraded Hexon turbo and was at the 350whp range! So with that JB4 piggy back alone and no back end flash, he lost the fuel trims (AFR) and other things and caused pre-detonation in the motor which blew the piston from running lean and hot. Would more than likely not happen if he was fully tuned via flashed ECU or a back end flash stacked on the JB4 for monitoring and keeping the fuel trims and other factors for the proper setup that he was running. Pistons mainly break from running lean and hot which is caused by detonation which is a result of a bad tune or another component that fails. Last edited by D041987; 04-27-2017 at 06:40 PM.. |
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05-03-2017, 03:16 PM | #16 |
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He had a ton of issues with his car as he liked to push the envelope. I don't believe he even has the car anymore; he went with something else
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05-03-2017, 03:24 PM | #17 |
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05-03-2017, 04:28 PM | #18 | |
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hahahaha
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05-10-2017, 04:44 PM | #19 | |
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03-02-2019, 10:28 AM | #20 |
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i know it is an old post but just to make people aware the rods and pistons have a taper so fitting aftermarket rods won't work with standard pistons, i have just found that out while rebuilding my engine after bearing failure. i will now have to purchase forged pistons to be able to use the uprated forged rods i bought.
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03-02-2019, 04:47 PM | #21 | |
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06-24-2019, 01:41 PM | #22 | |
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Having seen so many rod bolt failures (across numerous car brands) from my amateur road racing days, I'm inclined to just swap the rod bolts, if that is possible. I still have not investigated if it is possible to drop the oil pan without removing the engine. I've got 182K miles on my N20 and have a plan to replace the motor mounts and turbo in the next few weeks. And possibly the rod bolts, if it's not too much extra work...
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