Engine Mechanical Topics Discussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.

another 88B build..boring i know

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Old Feb 4, 2015 | 07:36 AM
  #11  
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Just snagged a brand new compression tester. Heading home to see what happens. The previous one was my dad's 20+ year old gauge from his diesel mechanic days.
 
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Old Feb 4, 2015 | 07:48 AM
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With the introduction of larger valves, and work involved, the OE chamber volume usually becomes larger.
Tough to get the squeeze up on an 88"er w/o a piston sometimes.
Scott
 
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Old Feb 4, 2015 | 08:41 AM
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Alright well as of right now brand new tester I'm reading 153CCP, WOT, fuel pump fuse out, both plugs out, battery on the tender, I even took the air cleaner off. I'm stumped. Should I warm it up? this engine never used/burnt a lick of oil.
 
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Old Feb 4, 2015 | 09:04 AM
  #14  
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Originally Posted by nate_dawgg
Alright well as of right now brand new tester I'm reading 153CCP, WOT, fuel pump fuse out, both plugs out, battery on the tender, I even took the air cleaner off. I'm stumped. Should I warm it up? this engine never used/burnt a lick of oil.
oil never smelled gassy..im sure the rings are good. could still see crosshatch in cylinders.
 
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Old Feb 4, 2015 | 09:36 AM
  #15  
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Were the heads vacuum tested for 100% seal (no leakage past valve seats when valves are closed) by whoever did the porting/valve job?

Also could be improper sealing of the rings during break in. Here are some interesting links on proper break in:

http://www.hdtalking.com/harley_davi...e_upgrade.html

http://www.mototuneusa.com/break_in_secrets.htm
 
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Old Feb 4, 2015 | 10:08 AM
  #16  
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Originally Posted by dynawg1
Were the heads vacuum tested for 100% seal (no leakage past valve seats when valves are closed) by whoever did the porting/valve job?

Also could be improper sealing of the rings during break in. Here are some interesting links on proper break in:

http://www.hdtalking.com/harley_davi...e_upgrade.html

http://www.mototuneusa.com/break_in_secrets.htm
The jugs have never been removed. The rings are seated by Harley that are in it. As for the valves sealing I'm 100% positive they are. I didn't ask the guy but I know his work and it's top notch. Best of the best.
 
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Old Feb 4, 2015 | 10:23 AM
  #17  
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Being off one tooth on the outer gear would explain the issue.. Brings the intake close to 36 degrees.. Smaller motor with good low lift flow numbers will read less.
 
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Old Feb 4, 2015 | 10:24 AM
  #18  
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I think I'm going to chock it up as low ccp because the rings have 35k on them. I think I definitely will be boring my jugs. Just talked to my machinist. He says 98" on stock jugs I will run into overheating And he's seen a few blow the spigot out. He says 95" with forged pistons, wrist pins, rings, clips base gasket(o-ring) and mls head gasket $610. Scott I know you offer the 98" what's your take on this? Also what is your price on the above package?
 
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Old Feb 4, 2015 | 11:14 AM
  #19  
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Originally Posted by bwoltz
Being off one tooth on the outer gear would explain the issue.. Brings the intake close to 36 degrees.. Smaller motor with good low lift flow numbers will read less.
Yeah I triple checked the timing. It's gear on gear so awfully simple to get the dots lined up.
 
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Old Feb 4, 2015 | 11:42 AM
  #20  
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Originally Posted by nate_dawgg
Yeah I triple checked the timing. It's gear on gear so awfully simple to get the dots lined up.
I know it's hard to get off but have seen it done.. Is it possible you got 585s instead of 583s? Maybe the cams are mismarked? About the only other thing would be shaving the key on the cam gear during outer gear install..
 
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