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.

Leakdown Test

Thread Tools
 
Search this Thread
 
Old Mar 29, 2025 | 03:16 PM
  #11  
Dan89FLSTC's Avatar
Dan89FLSTC
Seasoned HDF Member
Veteran: Navy
Active Streak: 30 Days
Top Answer: 3
Top Answer: 5
Joined: May 2008
Posts: 21,201
Likes: 12,786
From: South Carolina
Default

Originally Posted by 98hotrodfatboy
One and Done.. Isn't that Sumpin....
When I hear that an engine is guzzling oil, but compression is good and leakdown is good, my first guess is an error in computing oil consumption.

I`m not a big fan of leakdown testing (on a simple 2 cylinder air cooled engine), I think a compression test is at least as good, but neither tells you how much compression you have when the engine is actually running.
 
Reply
Old Mar 29, 2025 | 03:20 PM
  #12  
98hotrodfatboy's Avatar
98hotrodfatboy
Seasoned HDF Member
15 Year Member
Liked
Loved
Joined: Mar 2010
Posts: 21,143
Likes: 7,657
From: Poolville
Default

Originally Posted by Dan89FLSTC
When I hear that an engine is guzzling oil, but compression is good and leakdown is good, my first guess is an error in computing oil consumption.

I`m not a big fan of leakdown testing (on a simple 2 cylinder air cooled engine), I think a compression test is at least as good, but neither tells you how much compression you have when the engine is actually running.
True..
I'd like to see some pictures, evidence, of the spark plugs etc.. The reason why I made that little remark "Isn't that Sumpin" was maybe that is his issue...
Who knows..
 
Reply
Old Mar 29, 2025 | 07:15 PM
  #13  
Max Headflow's Avatar
Max Headflow
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,960
Likes: 8,054
From: poway
Default

You can have good leak / compression and burn a ton of oil.. Just install the second compression ring upside down..
 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
David Crowell
Touring Models
10
Oct 11, 2024 08:35 PM
tngarren
Ignition/Tuner/ECM/Fuel Injection
5
Oct 13, 2022 08:39 AM
Ol' Biker
EVO
14
Jun 6, 2022 02:57 PM
bigirn
Exhaust System Topics
6
Dec 26, 2011 05:52 AM
98fxd
Exhaust System Topics
4
Aug 4, 2005 07:04 PM




All times are GMT -5. The time now is 03:56 AM.

story-0
Harley-Davidson Fat Boy Becomes a Dark, Decepticon-Inspired Custom

Slideshow: Killer Custom's latest build relies on styling changes rather than performance upgrades, giving the cruiser an entirely different personality.

By Verdad Gallardo | 2026-06-03 18:28:05


VIEW MORE
story-1
6 Weirdest Harley-Davidsons Ever Sold to the Public

Slideshow: From military-inspired singles to scooters and three-wheel utility vehicles, these Harleys took the company far outside its comfort zone.

By Verdad Gallardo | 2026-06-02 18:34:10


VIEW MORE
story-2
7 Times Harley-Davidson Chucked Tradition Out the Window

Slideshow: Harley-Davidson built its reputation on nostalgia, but every so often, the company took a hard left turn into the future.

By Verdad Gallardo | 2026-05-20 11:18:19


VIEW MORE
story-3
7 Surprising Harley-Davidson Products that Are Not Motorcycles

Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.

By Verdad Gallardo | 2026-04-29 16:50:35


VIEW MORE
story-4
8 Best Harley-Davidson Motorcycles Ever

Slideshow: Not every Harley gets it right, but these are the ones that genuinely earned their reputation.

By Pouria Savadkouei | 2026-04-15 14:23:21


VIEW MORE
story-5
10 Worst Harley-Davidson Motorcycles Ever

Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.

By Pouria Savadkouei | 2026-04-01 20:01:09


VIEW MORE
story-6
Killer Custom's Jail Break Is The Breakout That Refused to Blend In

Slideshow: Killer Custom's "Jail Breaker" build focuses more on stance and visual aggression than mechanical overhaul.

By Verdad Gallardo | 2026-03-18 19:20:32


VIEW MORE
story-7
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?

Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.

By Verdad Gallardo | 2026-03-07 16:15:30


VIEW MORE
story-8
Harley-Davidson Reveals Super Cool Cafe Racer Concept

Slideshow: Harley-Davidson's new RMCR concept revives the café racer formula with modern hardware-and it may be exactly the reset the company needs.

By Verdad Gallardo | 2026-03-04 12:23:37


VIEW MORE
story-9
Engraved Rebellion: Inside Bundnerbike's Glam Rock II

Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.

By Verdad Gallardo | 2026-02-24 18:19:44


VIEW MORE