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Old 09-23-2013, 11:18 PM   #1
uber e36
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Charging motor with 320k

Just had the compression checked on my m50. Apparently it's 175 across the cylinders. The shop has said that because the motor has 320k they suggest a full rebuild before installing my supercharger.

They think the main concern is oil pressure and are concerned there may not be enough pressure to feed adequate oil to the charger.

Does this seem like the best advice?
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Old 09-23-2013, 11:37 PM   #2
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Or for half the cost of rebuild, you can get a new motor with way less than half of your milage! Or better yet swap to 2.8!
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Old 09-25-2013, 07:39 AM   #3
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But with a used 160km motor, wouldn't I still be looking at potential issues?

A full rebuild sounds like I could have the motor for another 18 years without worrying...
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Old 09-25-2013, 09:42 AM   #4
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or you could take your time, and buy a 2.8 build it up and put some bolt on's!
If your charging the engine wont last 18 years... unless you build the engine properly and thats $$$$
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Old 09-25-2013, 09:45 AM   #5
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I've already got an AA SC kit for my M50 ready to go and I already own my motor, so no point in going and buying an S52.
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Old 09-25-2013, 10:41 AM   #6
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Put the sc on and enjoy. The kits designed to run on stock motors, I e never heard of anyone blowing more then a head gasket. You could buy 6 M50 motors as spares for the price of a full rebuild.
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Old 09-25-2013, 12:38 PM   #7
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i would definitely not rebuild the motor if it has perfect compression along all cylinders.

if you boost your motor, you'll eventually blow it up, so throw the s/c on and enjoy, if you end up having to rebuild in a few years you'll chalk it up to maintenance.
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Old 09-25-2013, 01:18 PM   #8
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Originally Posted by richie_s999 View Post
Put the sc on and enjoy.
This. These engines seem to be able to handle mild boost without too much trouble. If you're worried about lower oil pressure because of looser bearing clearance (??) then put a gauge on there and measure it.

Otherwise you might start solving a problem you don't have by doing an expensive engine rebuild, and then introduce new problems.

Have fun with the boost!
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Old 09-25-2013, 02:33 PM   #9
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Their advice makes no sense at all, a compression test has nothing to do with oil pressure. If they're concerned with oil pressure, they need to hook a gauge up to it and verify the oil pressure. iirc it should be making 50-60psi cold at idle and 12-20psi warmed up.

If anything you should have done a leak down test as this will tell you what kind of condition the rings are in as well as the head ie valve seals etc
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Old 09-25-2013, 03:35 PM   #10
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Does this shop have experience with bmw's and the kit you want to put on, or are they seeing a bmw and seeing $$$$
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Old 09-25-2013, 09:16 PM   #11
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The shop is just a local mechanic, not a performance shop by any means. They were supposed to do a leak down but didn't.

Regarding their comment about oil pressure, I was pretty sure - and double checked - my kit runs off its own oil supply/cooler!

Looks like I'll do a leak down for peace of mind and install the kit. I think I'll take it to one of the preferred shops for this and get their opinion.

I've got to read into the fan delete mod again, as I did it and am going to have to reverse it now!
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Old 09-28-2013, 05:54 PM   #12
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Put the charger on. Worry less drive more. Instead of "undoing" the fan delete mod, just install a proper shroud and electric puller fan.
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Old 09-28-2013, 10:12 PM   #13
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175psi is actually not that bad. I'd say this is a healthy number. Run the supercharger on the motor until (if) it blows up.
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Old 09-29-2013, 11:17 AM   #14
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Get a new mechanic.
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Old 09-29-2013, 11:28 AM   #15
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Get a new mechanic.
+1 you goto a generic shop. You'll get generic advise.
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