1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.

What did your compression test read?

Discussion in 'General Tech and Maintenance' started by phyregod, Jul 23, 2005.

  1. phyregod

    phyregod !!YTINASNI

    Messages:
    9,449
    Likes Received:
    225
    Joined:
    Jun 11, 2005
    Location:
    Central Texas
    I'm about to compression test my new motor.

    I'm curious what it is going to read, I had the head decked "as much as possible".. and polished combustion chambers with deshrouded valves. Otherwise, it is a stock B18A1 as far as compression is concerned. What did yours read?

    I'll post mine when I'm done today.
     
  2. B16CRX

    B16CRX Senior Member

    Messages:
    531
    Likes Received:
    0
    Joined:
    Jan 24, 2004
    Location:
    Greenville, SC
    my stock b16A scored 235 all the way accross. 10.2:1 CR
     
  3. Citizen_Insane

    Citizen_Insane Senior Member

    Messages:
    3,698
    Likes Received:
    3
    Joined:
    Jul 24, 2003
    Location:
    Minneapolis
    ^^Woah, thats way too high. Mine was 175-180psi all across...and from what I hear, that is pretty normal for b-series honda engines.
     
  4. GSRCRXsi

    GSRCRXsi Super Moderator Moderator VIP

    Messages:
    9,622
    Likes Received:
    345
    Joined:
    Nov 13, 2002
    Location:
    MD
    my gsr (10:1) had like 230-240 across.
     
  5. jamesA

    jamesA Well known pissed off telephone guy VIP

    Messages:
    16,122
    Likes Received:
    1,020
    Joined:
    Aug 10, 2003


    whoa... aren't they supposed to be around 210?
     
  6. BigJ

    BigJ I'm just about that action Boss. VIP

    Messages:
    11,090
    Likes Received:
    408
    Joined:
    Oct 4, 2002
    Location:
    Washington
    My prelude was 200 across.
     
  7. K2e2vin

    K2e2vin Senior Member

    Messages:
    8,446
    Likes Received:
    92
    Joined:
    Jan 2, 2003
    Location:
    Raleigh, NC
    d15: 210-200 and then 160 on cylinder 3 :(
     
  8. MikeBergy

    MikeBergy Blah blah blah....

    Messages:
    3,646
    Likes Received:
    1
    Joined:
    Oct 9, 2003
    Location:
    Central Coast, CALI


    cool. I deshrouded and polished my chambers as well, but left the stock deck height, and opted for some custom 11.5:1 CP slugs. Eager to see your results.
     
  9. 97CTR

    97CTR Senior Member

    Messages:
    745
    Likes Received:
    0
    Joined:
    Jul 10, 2003
    250 all the way across

    and having high compression numbers from a test is not bad, also it may not have been done 100% correctly.
     
  10. noobvang

    noobvang Senior Member

    Messages:
    382
    Likes Received:
    0
    Joined:
    Apr 30, 2003
    Location:
    Twincities, MN
    Got 270 all across with a 12:1 CR (Redecked block of .10 and milled head off .15)
     
  11. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

    Messages:
    28,465
    Likes Received:
    228
    Joined:
    Sep 30, 2002
    Location:
    Dallas / Fort Worth, TX
    Got:

    1 267
    2 276
    3 265
    4 269

    on 12.8:1 compression, only 4 pumps on gauge- any more and it would top out the compression tester.
     
  12. noobvang

    noobvang Senior Member

    Messages:
    382
    Likes Received:
    0
    Joined:
    Apr 30, 2003
    Location:
    Twincities, MN
  13. phunky.buddha

    phunky.buddha Admin with a big stick Admin VIP

    Messages:
    28,465
    Likes Received:
    228
    Joined:
    Sep 30, 2002
    Location:
    Dallas / Fort Worth, TX
    Thanks! If I had let it keep pumping to where it stopped moving the needle, I would have needed a 400psi gauge... it would have topped out somewhere in the 350 range probably.
     
  14. B16CRX

    B16CRX Senior Member

    Messages:
    531
    Likes Received:
    0
    Joined:
    Jan 24, 2004
    Location:
    Greenville, SC


    My compression test was done correctly. Its not easy to screw that up. lol. I always heard 230's was normal for a b16.
     
  15. D See 2

    D See 2 Senior Member

    Messages:
    2,405
    Likes Received:
    0
    Joined:
    Sep 29, 2002
    Location:
    Baltimore, MD
    Manual says compression tests should be done when the engine is at operating temp. I'll bet half of you did it while cold. Which is why everyone's readings seem high...

    This is straight from the service manual VTEC Supplement OBD0 B16a 10.2:1

    Notice the standards... 185 psi...

    [​IMG]
     
  16. MikeBergy

    MikeBergy Blah blah blah....

    Messages:
    3,646
    Likes Received:
    1
    Joined:
    Oct 9, 2003
    Location:
    Central Coast, CALI


    LOL I like #7.
    "when pressure is high, inspect the following item: accumulated carbon on piston and cylinder head"

    JDM compression raise, yo!! :)
     
  17. 97CTR

    97CTR Senior Member

    Messages:
    745
    Likes Received:
    0
    Joined:
    Jul 10, 2003
    that guide sucks. Doesn't tell you how many times to crank the engine over, doesn't tell you to depress the gas pedal while doing the test either. And I remove my FI fuse so I am not still spraying gas into my cylinders also.
     
  18. B16CRX

    B16CRX Senior Member

    Messages:
    531
    Likes Received:
    0
    Joined:
    Jan 24, 2004
    Location:
    Greenville, SC


    same here, only I just flip my fuel pump kill switch. and crank until teh needle stops. (with accelerator floored of course)
     
  19. Som1Dies2Nite

    Som1Dies2Nite Member

    Messages:
    55
    Likes Received:
    0
    Joined:
    May 30, 2005
    My brothers D15/Z6 head is getting 220, 185, 155, 220.
     
  20. n20hatch

    n20hatch Member

    Messages:
    95
    Likes Received:
    0
    Joined:
    Oct 2, 2004
    Location:
    Oregon
    JDM obd1 b16a
    cyl 1 180
    cyl 2 80
    cyl 3 125
    cyl 4 160

    Woot woot, headgasket and rings on cyl 2 lol
     
Verification:
Draft saved Draft deleted

Share This Page