www.CVOHARLEY.com

Please login or register.

Login with username, password and session length
Advanced search  

Author Topic: Compression Check ?  (Read 1364 times)

0 Members and 1 Guest are viewing this topic.

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Compression Check ?
« on: November 01, 2009, 07:23:06 AM »
I want to do a compression test on my 09 SERG and with the ACR and FBW I am not sure I can do it by jumping the starter with a remote switch which I have done on many bikes so I do not have to ground the plugs. Anyone try this yet? Thanks Doc.
« Last Edit: November 01, 2009, 03:30:00 PM by HDDOCFL »
Logged

johnsachs

  • Vendor
  • Elite CVO Member
  • *
  • Offline Offline
  • Posts: 747
Re: Compression Check ?
« Reply #1 on: November 02, 2009, 06:10:05 PM »
Doc,
Prop the butterfly open,jump starter and solenoid with a remote starter button,keep the ign. switch OFF,and have at it. ;)
John
Logged

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: Compression Check ?
« Reply #2 on: November 03, 2009, 07:12:14 AM »
Thanks John, thats how I have done it in the past, but thought with the FBW and ACR I would have a problem. See now I can still do it like before. Thanks Doc
Logged

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: Compression Check ?
« Reply #3 on: November 12, 2009, 02:49:47 PM »
Compression test complete.  Warm engine 216 psi front cylinder 215 psi rear, not bad at all in my book.  Doc
Logged

johnsachs

  • Vendor
  • Elite CVO Member
  • *
  • Offline Offline
  • Posts: 747
Re: Compression Check ?
« Reply #4 on: November 12, 2009, 05:31:13 PM »
Quote from: HDDOCFL on November 12, 2009, 02:49:47 PM
Compression test complete.  Warm engine 216 psi front cylinder 215 psi rear, not bad at all in my book.  Doc

Doc,
Your gauge is right on,,,,,,,,,,,,,,
John
Logged

aka_Matt

  • Junior CVO Member
  • **
  • Offline Offline
  • Posts: 96
Re: Compression Check ?
« Reply #5 on: November 12, 2009, 10:19:16 PM »
and whats the combo? kinda high numbers, about 11:1?
Logged
2004 XL1200C: Blue/Flames, Chrome Everything, 2-1 Rinehart, Mid-Controls, 17" Deuce Wheel, And More... For Sale

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: Compression Check ?
« Reply #6 on: November 13, 2009, 06:50:45 AM »
Stock 110" 09 motor in a SERG.   


Thanks John Sacks for the info. thought I would have a problem with the ACRs doing the starter jump, but they stayed closed.   Doc
Logged

grc

  • 10K CVO Member
  • ****
  • Offline Offline
  • Posts: 14216
  • AKA Grouchy Old Fart
    • IN


    • CVO1: 2005 SEEG2
Re: Compression Check ?
« Reply #7 on: November 13, 2009, 08:24:09 AM »
Quote from: aka_Matt on November 12, 2009, 10:19:16 PM
and whats the combo? kinda high numbers, about 11:1?

Matt, the high cranking compression numbers are the result of the camshaft, not a high static compression ratio.  The static CR is around 9.3:1 according to Harley's specs. 

Jerry
Logged
Jerry - 2005 Cherry SEEG  -  Member # 1155

H-D and me  -  a classic love / hate relationship.  Current score:  love 40, hate 50, bewildered 10.

HD Street Performance

  • Vendor
  • 2.5K CVO Member
  • *
  • Offline Offline
  • Posts: 3119
Re: Compression Check ?
« Reply #8 on: November 13, 2009, 10:36:10 AM »
Read the CVO service manual supplement on the 110 related to compression tests
Logged

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: Compression Check ?
« Reply #9 on: November 13, 2009, 10:42:31 AM »
Don due you think I am missing something?  Thanks Doc
Logged

aka_Matt

  • Junior CVO Member
  • **
  • Offline Offline
  • Posts: 96
Re: Compression Check ?
« Reply #10 on: November 13, 2009, 02:53:52 PM »
Quote from: grc on November 13, 2009, 08:24:09 AM
Matt, the high cranking compression numbers are the result of the camshaft, not a high static compression ratio.  The static CR is around 9.3:1 according to Harley's specs. 

Jerry

i didn't know he had the stock 110... i know they have high numbers because of the cam, but i didn't think they would be THAT high... i figured about the 190 range...
Logged
2004 XL1200C: Blue/Flames, Chrome Everything, 2-1 Rinehart, Mid-Controls, 17" Deuce Wheel, And More... For Sale

HD Street Performance

  • Vendor
  • 2.5K CVO Member
  • *
  • Offline Offline
  • Posts: 3119
Re: Compression Check ?
« Reply #11 on: November 13, 2009, 03:03:24 PM »
The online tools miss the mark with the SE CVO
They are actually a lot higher than the numbers figure. I don't recall the numbers in the book but IIRC it was 210-220 without releases.
Logged

HDDOCFL

  • 1K CVO Member
  • *
  • Offline Offline
  • Posts: 1032
  • Never Say Never
Re: Compression Check ?
« Reply #12 on: November 13, 2009, 07:41:12 PM »
215psi puts me right in the middle.  Doc
Logged
 

Page created in 0.212 seconds with 25 queries.