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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 11-08-2016, 07:25 PM   #21
eforer
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Alright I did the compression test today, found some time from work so I didn't have to have a shop do it.

I know the spec is 142-156psi for e46

Mine showed between 175-185 for cylinders 1 thru 5, possibly because 325 has compression rate of 10.5-1 as opposed to 330s being 10.25-1

I did every cylinder twice and fuel pump fuse was removed, cranked engine 5 times

Cylinder 6 which is where I have my misfire read 70psi.

Went in with a boroscope and saw a slight shiny bit on the the top of the Piston near the relief area for the valves, on the exhaust side.

Couldn't clearly make out a bent exhaust valve on the camera but it doesn't have to be off by much to cause a problem.

I removed my CCV today which only took about 3 hours wasn't as horrible as every makes it out to be, just cut the old hoses instead of trying to unclip them from the CCV unit.

Inspected inside the CCV, no gunky yellow buildup it just probably failed due to the high pressure of engine running over 7500rpm.


I'll be attempting to remove the cylinder head and inspecting it, I also found a local cyldiner head for e46 for $500, 2000km on it. Are these interchangeable between 323/325/328/330 or are they different for each engine size

Last edited by eforer; 11-08-2016 at 07:26 PM.
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Old 11-08-2016, 07:38 PM   #22
Rob43
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Considering what you just posted, I have no Idea why you're bothering with a different head.

Go to your local dealer (or online) & purchase an exhaust valve and valve seal, then install & lap in.

Done.



Rob43
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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 SCCA
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"Chance Favors The Prepared Mind"

I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
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Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 11-08-2016, 08:51 PM   #23
eforer
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Quote:
Originally Posted by Rob43 View Post
Considering what you just posted, I have no Idea why you're bothering with a different head.

Go to your local dealer (or online) & purchase an exhaust valve and valve seal, then install & lap in.

Done.



Rob43

It's just an option for when I get head inspected, if it's warped it would be cheaper than getting it machined
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Old 11-08-2016, 09:01 PM   #24
Rob43
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Quote:
Originally Posted by eforer View Post
It's just an option for when I get head inspected, if it's warped it would be cheaper than getting it machined

If it never got HOT in an overheat scenario, 99.9% says it straight....



Rob43
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Rob #43 ITS/ITR/STU, BMW 325I, STU LAP RECORD
SUMMIT POINT WV 1:24:229 SCCA
(DynoDynamics https:vimeo.com/8486878 Dyno Video)
"Chance Favors The Prepared Mind"

I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 11-09-2016, 09:09 AM   #25
Landlorder
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Yo just change the valves etc ! ! Im at 200k miles now with a money shift i did at 140k 5 years ago...!
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