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  #1  
Old 01-13-2021, 03:57 PM
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4.6is compression numbers

What are the values to determine "good" compression on the M62 4.6? The previous owner did a compression test and the values were around 150.
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  #2  
Old 01-13-2021, 04:37 PM
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you are looking for numbers around 150 with cyl to cyl +- a few PSI. It is the ones way off that is the worry. not so much as "how high are they"
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Old 01-13-2021, 04:58 PM
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okay cool. I drove the car back from BC to Reno not knowing the oil pickup was full of old timing guide debris and I pray that no damage was done to the motor. It runs great and has 152-155 compression on all cylinders still. I just get paranoid.
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Old 01-13-2021, 05:27 PM
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Unless you were at 6,000 RPM the whole way you should be good.
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2005 X5 4.8IS
The Blue ones are always FASTER....

Current Garage:
2005 X5 4.8is
2002 M5 TiSilver
2003 525iT
1998 528i
Former Garage Stable Highlights
2004 325XiT Sport
1973 De Tomaso Pantera, L Model
1970 Dodge Challenger T/A 4 sp Alpine White
1970 Dodge Challenger T/A 4 sp GoManGo Green
1971 Dart Sport, “Dart Light” package
1969 Road Runner 383
1968 Ply Barracuda 340S FB Sea-foam Green
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  #5  
Old 01-14-2021, 05:20 AM
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I believe I had 200-210 on all
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  #6  
Old 01-14-2021, 01:30 PM
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Quote:
Originally Posted by aureliusmax View Post
I believe I had 200-210 on all
What unit of measure is the gauge?

Just like the speedometer on cars can be KPH or MPH, the reading will be diifferent.
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Old 01-14-2021, 06:07 PM
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Also, old school compression test was with carburetor throttle plates had to be wide open. Does one open the throttle body on the modern cars to do a test??
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  #8  
Old 01-14-2021, 07:19 PM
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Quote:
Originally Posted by CapeX5 View Post
Also, old school compression test was with carburetor throttle plates had to be wide open. Does one open the throttle body on the modern cars to do a test??
Throttle body on newer cars is electronically controlled.
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Lotus Europa 1970 Destroyed by fire
Lotus Europa 1970 S2 Renault Powered
Lotus Type 52 1970 Twincam Webers Powered
PORSCHE 911 Targa 1982 The Garage Queen
Audi Avant donated to Kars for Kids
BMW 525IT Sold
Audi 4000CS Quattro Sold
Jensen Healey Lotus Powered Sold
Opel 1900 Sold
Triumph Spitfire 1971 Sold
Triumph Spitfire 1968 Sold
Plymouth "Cuda" 340 Six pack SOLD
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  #9  
Old 01-15-2021, 06:03 AM
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Quote:
Originally Posted by x5Alpine View Post
okay cool. I drove the car back from BC to Reno not knowing the oil pickup was full of old timing guide debris and I pray that no damage was done to the motor. It runs great and has 152-155 compression on all cylinders still. I just get paranoid.
https://xoutpost.com/bmw-sav-forums/...thread-26.html

Bimmerbreaker talked about having some oil starvation issues on his M62 that may have caused the rod bearings to fail.

He mentioned "..sustained high-RPM driving uphill to Flagstaff " and bits of guide pcs as possible causes.
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