Not feeling it
This has been interesting to follow. Who would have thought that an incorrect oil pump o-ring could kill 50 (or more) hp? Well, besides Max and 98hotrodfatboy...
Glad it was an inexpensive and relatively simple repair at least.
Glad it was an inexpensive and relatively simple repair at least.
Seasoned HDF Member
Joined: Mar 2010
Posts: 21,006
Likes: 7,541
From: Poolville
Thank you but Max really does deserve most all the credit.. I myself never thought that sumping could cause that much of a decrease in power.. That was massive but then again he wasn't getting any oil return hardly...
Last edited by 98hotrodfatboy; May 22, 2023 at 12:36 PM.
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Stellar HDF Member
Joined: Aug 2019
Posts: 3,063
Likes: 1,867
From: Unreconstructed
Hopefully, I'll get that stump pulling, low down torque I was expecting the first time now that the crank isn't half submerged in oil.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
In case you are wondering where all that power goes, it goes into the motor.. 10 second run and 40 hp loss means you just dumped 30KW of heat into the motor for that run.. The oil is getting that power as heat and it's going everywhere..
Grand HDF Member
Joined: Jul 2007
Posts: 3,723
Likes: 8,459
From: Bates County MO
Makes me wonder how much damage was done during a couple pulls- this combo is down on power about 15/15 
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Seasoned HDF Member
Joined: Sep 2008
Posts: 14,067
Likes: 11,085
From: San Diego, CA
Man, waiting for parts is KILLIJNG ME! The gasket set is supposed to be here tomorrow and the new pump on Wednesday. I also ordered replacement black sleeves and keepers for the pushrod tubes, but I don't know if I can make myself wait for them. S&S is right over in WI so maybe if I'm lucky they'll show up by the weekend...dammit, this week is going to be nice, and I just missed a beautiful weekend also.
Hopefully, I'll get that stump pulling, low down torque I was expecting the first time now that the crank isn't half submerged in oil.
Hopefully, I'll get that stump pulling, low down torque I was expecting the first time now that the crank isn't half submerged in oil.
Just a FWIW...
When I did one of my cam plate upgrades several years ago, I noticed that my parts manuals, for two different years, listed two different oil pump scavenger o-rings. I was confused by what the differences were and which was the newest version.
Turns out, there was an older black, buna rubber o-ring #11157 and a newer yellow, viton o-ring #11293. I would suggest using a viton o-ring, whether the HD #11293 offering or aftermarket equivalent.
Funny, I believe it was Max who schooled me about the differences in the o-rings back then on another forum....
Last edited by hattitude; May 23, 2023 at 10:12 AM.