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.

Dip in power curve?

Thread Tools
 
Search this Thread
 
Old Mar 10, 2017 | 07:11 AM
  #11  
Hillsidecycle.com's Avatar
Hillsidecycle.com
Sponsor
Joined: Dec 2007
Posts: 12,084
Likes: 829
Default

That .585 actually want to be about 10.75, and because of the design of that cam, it still may have a dip.
A Wood 8, will fill that in, at 10.7 cr, as would a couple other cams.

T/header will have and odd spot as well.
Scott
 
Reply
Old Mar 10, 2017 | 02:43 PM
  #12  
hrdtail78's Avatar
hrdtail78
Road Warrior
Veteran: Marine Corps
10 Year Member
Liked
Community Favorite
Joined: Mar 2013
Posts: 1,923
Likes: 587
From: Alorton, Illinois
Default

Rhineharts and 585. Both known to not help bottom end.


The other thing you got going is how the run was performed. RPM was held in place by brake. Throttle held WO and brake was released. This does cause the tq to go straight up and then it will settle a bit. Since it's a cable operated slide on the mik. This isn't helping. It helps the low end of the graph to hold the slide open enough to hit 100kpa and gradually open slide as RPM goes up keeping above 100kpa the whole time. Same concept of finding more low end by restricting the blade open acceleration on a TBW.
 
Reply
Old Mar 10, 2017 | 04:23 PM
  #13  
98hotrodfatboy's Avatar
98hotrodfatboy
Seasoned HDF Member
15 Year Member
Liked
Loved
Top Answer: 5
Joined: Mar 2010
Posts: 21,006
Likes: 7,540
From: Poolville
Default

Here's a good example of the difference in pipes. Motor was the same. An 83" evo. Work done by Scott.


 
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Blue Tick
2014-2024 Touring Models
13
May 19, 2018 04:40 PM
95th 1200
Softail Models
7
Mar 2, 2017 09:30 AM
pounder35
Touring Models
6
May 1, 2014 09:23 PM
Puglia10
Dyna Glide Models
7
Mar 10, 2014 07:26 PM
dirtracer27x
Exhaust System Topics
7
Apr 5, 2012 06:17 PM




All times are GMT -5. The time now is 07:51 AM.

story-0
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-1
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-2
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-3
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-4
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-5
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
story-6
10 Motorcycles You Should Never Buy

Slideshow: There is no shortage of great motorcycles to buy, but we would avoid these ten.

By Joe Kucinski | 2026-02-19 14:50:51


VIEW MORE
story-7
10 Things Harley-Davidson Needs to Fix in 2026

Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.

By Verdad Gallardo | 2026-01-13 18:33:17


VIEW MORE
story-8
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider

Slideshow: Graeme Billington's left-hand-drive Shovelhead is as much about problem-solving as it is about classic Harley form.

By Verdad Gallardo | 2025-12-30 11:27:08


VIEW MORE
story-9
The Best and Worst Harley-Davidson Moves of 2025

Slideshow: A clear-eyed look at what actually worked for Harley this year, and what quietly undermined its progress.

By Verdad Gallardo | 2025-12-29 17:10:48


VIEW MORE