VT2-625 KIT

[VCMpower]

[QUOTE=Chriskm3]

Originally Posted by BMRLVR

If you do enough searching, you'll come up with many different stories...most of them wrong or grossly misinformed. So I'll see if I can help you set the record straight.

For starters, if BMW has never changed specs on the rod bearings for this engine from the time they started to make it. So by definition, there is no such thing as an upgraded rod bearing to "latest bmw spec." You already have the latest spec. It's an easy check at www.realoem.com to confirm this for yourself.



Rod bearings are not like a v-belt or brake pads. You'll never take your car into the dealer and hear them say "it's time to replace your rod bearings with this visit." So no, replacing rod bearings is never a maintenance item.

I assume you do not have a supercharger. Why do you give misleading advice. there is a reason why ESS vf and aa advice on rod bearings replaceents for cars running 600 + hp supercharger kits.

Wait 2 years and there may be something Until then "the record is set straight"

[BMRLVR]

Originally Posted by Chriskm3

I assume you do not have a supercharger. Why do you give misleading advice. there is a reason why ESS vf and aa advice on rod bearings replaceents for cars running 600 + hp supercharger kits.

You assume right that I don't have a supercharger, but maybe you don't realize that I work on engines for a living.

The engines I work on (large turbo-diesel engines that displace anywhere from 8 to 120 litres of displacement) have a life expectancy of 18000 hours (18000 hours is equivalent to over 1 million miles on a passenger car) and I can only recall doing rod bearings before a rebuild 2-3 times out of hundreds of engines. These engines are at full load almost 100% of the time and they still hold up. Now you may say that a large turbo-diesel is not the same as a gasoline engine in a passenger car but a bearing is a bearing, a connecting rod is a connecting rod, and a crankshaft is a crankshaft no matter what the size is.

If BMW did have an updated rod bearing spec, or a recall on the bearings in the S65 I would definitely recommend changing to the updated spec....... But..... I can not find the spec on RealOEM or BMW TIS for the life of me....... Crank bearings do have updated part numbers, but rod bearings don't. If you can find me the updated BMW part numbers or some mention of BMW changing the specs on the rod bearings than I would love to see it.

Basically, what I would recommend to the OP if he is concerned is buy some ARP rod bolts, pull the rod caps off and inspect the stock bearings and see how they look. If all of the shells look good then personally, I would call it good and would proceed with the SC kit without changing anything (as a bonus you get to upgrade the rod bolts as part of the bearing inspection). If when the caps come off there is signs of wear or significant scouring I would then consider the option of having the engine sent out to a good machine shop and have the machine work done to attain the proper clearances on the bottom end........

[m33]

Originally Posted by Chriskm3

What differences have you found between the 525 to 625 then to 650. ?

Your boner gets bigger and bigger with each upgrade & then your giz shoots further as well ! Who needs a wife

[VCMpower]

Originally Posted by m33

Your boner gets bigger and bigger with each upgrade & then your giz shoots further as well ! Who needs a wife

:

[Chriskm3]

Originally Posted by m33

Your boner gets bigger and bigger with each upgrade & then your giz shoots further as well ! Who needs a wife

M33. Chime in on the rod bearing situation. U had a similar issue before selling the car.

I'd would say the car is cheaper to Maintain than the wife but then forgetting about the gucci purses.

[m33]

Originally Posted by Chriskm3

M33. Chime in on the rod bearing situation. U had a similar issue before selling the car.

I'd would say the car is cheaper to Maintain than the wife but then forgetting about the gucci purses.

I never had rod bearing issues, I just want to shoot my load further so I went Vt3 soon after that I'll be going Vt69 .

Get your facts straight, your kinda being a hypocrite telling bmrlve to stop misinforming people when your doing the exact same thing ...

:cheers:

[Chriskm3]

http://www.m3post.com/forums/showthread.php?t=824004

[BuckRodgers]

If you are concerned have your rod bearings inspected before you install your kit. Based on the amount of supercharged M3's on the road VS the number of proven failures I would say chances are you are fine even if you do not do an inspection or replace them, unless you are at a really high milage.

[BMRLVR]

Originally Posted by BuckRodgers

If you are concerned have your rod bearings inspected before you install your kit. Based on the amount of supercharged M3's on the road VS the number of proven failures I would say chances are you are fine even if you do not do an inspection or replace them, unless you are at a really high milage.

These were my exact recommendation a few posts up!

Good as advice Buck!

[VCMpower]

Originally Posted by BMRLVR

These were my exact recommendation a few posts up!

Good as advice Buck!

No it was not. You said the bearings never make surface contact and do not wear regardless of miles unless the fitment is incorrect to start with. Not a maintenance item, remember. So mileage is irrelevant. Unlike what buck said.

[BMRLVR]

Originally Posted by VCMpower

No it was not. You said the bearings never make surface contact and do not wear regardless of miles unless the fitment is incorrect to start with. Not a maintenance item, remember. So mileage is irrelevant. Unlike what buck said.

Read post #24!

By the way, you need to give up on this stupidity....... I work on engines all day everyday and I am no idiot. Yes when mileage gets excessively high 250K+ you may have wear on your main and rod bearings from the amount of starts that the engine had with zero oil pressure (read metal to metal contact). Now with that being said, that doesn't make bearings a maintenance item, bearings are intended to last for the service life of an engine and yes, when oil clearance is set properly and the proper grade of oil is used for the intended service of the engine there is in-fact no metal on metal contact under normal operation......... If there was continual heavy metal on metal contact, the bearings life would be only a few hundred miles or a few hours.

I guarantee you that if you let me build an S65 for you with oil clearances set to my preferred spec, that engine would last a very long time, there would be NO bearing issues with it and I could build that engine for you with the OEM bearings with 100% confidence. The key to a good bottom end in an engine is in the measuring and machine work....... If you don't have those two things no bearings will last no matter what coating they have on them!

[VCMpower]

Originally Posted by BMRLVR

Read post #24!

By the way, you need to give up on this stupidity....... I work on engines all day everyday and I am no idiot. Yes when mileage gets excessively high 250K+ you may have wear on your main and rod bearings from the amount of starts that the engine had with zero oil pressure (read metal to metal contact). Now with that being said, that doesn't make bearings a maintenance item, bearings are intended to last for the service life of an engine and yes, when oil clearance is set properly and the proper grade of oil is used for the intended service of the engine there is in-fact no metal on metal contact under normal operation......... If there was continual heavy metal on metal contact, the bearings life would be only a few hundred miles or a few hours.

I guarantee you that if you let me build an S65 for you with oil clearances set to my preferred spec, that engine would last a very long time, there would be NO bearing issues with it and I could build that engine for you with the OEM bearings with 100% confidence. The key to a good bottom end in an engine is in the measuring and machine work....... If you don't have those two things no bearings will last no matter what coating they have on them!

I have had the S65 apart. Measured clearances re assembled. You are wrong. I own and operate a BMW service center that has been in business 37 years. Good luck on your stroker.

[Longboarder]

Originally Posted by m33

I never had rod bearing issues, I just want to shoot my load further so I went Vt3 soon after that I'll be going Vt69 .

[BMRLVR]

Originally Posted by VCMpower

I have had the S65 apart. Measured clearances re assembled. You are wrong. I own and operate a BMW service center that has been in business 37 years. Good luck on your stroker.

Forgive me, but if all you do is measure and reassemble then you are just a basic shop. Building an engine requires more than just measuring and reassembling, it involves having machine work done to ensure tolerances are exact and the end product is going to last. Throwing a set of rod bearings in an engine and using plastigauge to check the clearances don't an engine builder make! How are you checking journals for roundness and taper with plastigauge, how are you checking the crank for runout? Main bore alignment?......... The list of checks goes on and on.......

By the way, thanks for the well wishes on my stroker, I won't need good luck though, I will be speccing the clearances for my mains and rods so it is going to last

[VCMpower]

Originally Posted by BMRLVR

Forgive me, but if all you do is measure and reassemble then you are just a basic shop. Building an engine requires more than just measuring and reassembling, it involves having machine work done to ensure tolerances are exact and the end product is going to last. Throwing a set of rod bearings in an engine and using plastigauge to check the clearances don't an engine builder make! How are you checking journals for roundness and taper with plastigauge, how are you checking the crank for runout? Main bore alignment?......... The list of checks goes on and on.......

By the way, thanks for the well wishes on my stroker, I won't need good luck though, I will be speccing the clearances for my mains and rods so it is going to last

I had it apart for other reasons as well, gt4 head gaskets.... I just wanted to mention what seemed relevant. I do also build complete motors and spent many years next to a machine shop and have performed all machining myself. One that could be notable was a 383 chev stroker I built( before kits were available ). Had to take over 200 thou off mains to fit the 400 crank! Took a awful long time. I reshaped piston skirts and balanced pistons and on and on. Never a problem with that beast. I'm sure we are both competent in what we do and I truly am interested in your stroker build.

[JDM3]

Originally Posted by m33

Your boner gets bigger and bigger with each upgrade & then your giz shoots further as well ! Who needs a wife

Lmao....my windshield always seems to have some spunk on it

[VCMpower]

Originally Posted by 1SICKM

Lmao....my windshield always seems to have some spunk on it

M3= pure chat porn : well someone said who needs a wife