Jump to content

rebuilt motor with wide range on compression, concern?


Recommended Posts

I would change my underpants first, then go get a leakdown test.

And maybe a new compression tester.

That would be 'really really not good' in my book if the numbers are real.

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

Link to comment
Share on other sites

any decent garage can do it. or for the same amount of money you can buy the tool and do it yourself if you have a decent air compressor.

agree with toby...those are really bad numbers..both in value and consistency. were you holding the throttle open while doing the test? as it a stock spec rebuild?

who did the rebuild? i would take it back to them for the testing...

3xM3

Link to comment
Share on other sites

Shit, you know what? I did forget to open the throttle when doing the test, although I'm not sure I can hang my hopes on that. Doubled checked the valve clearances and they are fine, but I don't have my own air compressor so I guess it's of to a so tomorrow afternoon. Does the engine need to be dead cold to run a good leak test? Local machine shop did the work on the short block. It seemed to me that they did a pretty good job, but maybe this is why it cost $4000 less than taking it to Korman :/

Link to comment
Share on other sites

I think taking it to the shop that did the work's a GOOD idea, initially.

That way they have a chance to 'splain things, Lucy!

If you don't like their story, then you can look for better ones.

Also, have them do a compression test to start, then a leakdown.

I think you're wise to not get too hopeful- closed throttle plates don't usually

make much difference in the unevenness, in my experience

sorry

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

Link to comment
Share on other sites

gee- I wonder is they thought that all the piston

ring end gaps were sopposed to all line up !?!?!?

one explaination where all the compression is goiing for all cylinders ?!?

please do CHECK ALL VALVE CLEARANCES F I R S T!

'86 R65 650cc #6128390 22,000m
'64 R27 250cc #383851 18,000m
'11 FORD Transit #T058971 28,000m "Truckette"
'13 500 ABARTH #DT600282 6,666m "TAZIO"

Link to comment
Share on other sites

To follow up, I guess it IS all in the technique. Re-tested the compression today, this time after driving the car with the engine warm and the throttle open, and got 110 psi on cyl. 4 and still read 110 psi on cyl. 1. Didn't test 2 & 3 because I was done burning my fingers at that point, and I can't really understand the huge difference, but I feel much more comfortable that nothing is horribly wrong now that I see 105 instead of 75, hooray! (With 9.5 pistons in an ideal world after break-in I should be ~125 psi, correct?) I'm still planning on going ahead and getting a full leak down test done on Saturday though, so will let you know if anything else new turns up there. Thanks guys!

-Carl

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

  • BMW Neue Klasse - a birth of a Sports Sedan

    BMW Neue Klasse - a birth of a Sports Sedan

    Unveiling of the Neue Klasse Unveiled in 1961, BMW 1500 sedan was a revolutionary concept at the outset of the '60s. No tail fins or chrome fountains. Instead, what you got was understated and elegant, in a modern sense, exciting to drive as nearly any sports car, and yet still comfortable for four.   The elegant little sedan was an instant sensation. In the 1500, BMW not only found the long-term solution to its dire business straits but, more importantly, created an entirely new
    History of the BMW 2002 and the 02 Series

    History of the BMW 2002 and the 02 Series

    In 1966, BMW was practically unknown in the US unless you were a touring motorcycle enthusiast or had seen an Isetta given away on a quiz show.  BMW’s sales in the US that year were just 1253 cars.  Then BMW 1600-2 came to America’s shores, tripling US sales to 4564 the following year, boosted by favorable articles in the Buff Books. Car and Driver called it “the best $2500 sedan anywhere.”  Road & Track’s road test was equally enthusiastic.  Then, BMW took a cue from American manufacturers,
    The BMW 2002 Production Run

    The BMW 2002 Production Run

    BMW 02 series are like the original Volkswagen Beetles in one way (besides both being German classic cars)—throughout their long production, they all essentially look alike—at least to the uninitiated:  small, boxy, rear-wheel drive, two-door sedan.  Aficionados know better.   Not only were there three other body styles—none, unfortunately, exported to the US—but there were some significant visual and mechanical changes over their eleven-year production run.   I’ve extracted t
  • Upcoming Events

×
×
  • Create New...