Rage Racing Inc.

Rage Racing Inc. Rage Racing is a Harley-Davidson specialty shop that provides repair, maintenance, and high performa

Few (none) of the big name dyno shops that are posting huge power and torque numbers (a little too huge) are posting abo...
05/28/2026

Few (none) of the big name dyno shops that are posting huge power and torque numbers (a little too huge) are posting about how “good“ the tune is or how drivable these Harleys are.

I will

Top dyno sheet is the front and rear cylinder air/fuel ratios before dyno tuning of 11 throttle positions from 5% to 100%. The ratios vary from 10.2 to 15.6

Bottom dyno sheet is the same exact throttle positions after my tuneup. Air fuel ratios go from 14.3 at light throttle/cruising down to 12.8 full throttle power.

Best of both worlds. Light throttle fuel economy and smooth running without building too much heat and full power when you twist the throttle.

Which would you want?Dark colored lines representing the torque and horsepower of motorcycle “A”143.90 torque135.69 hors...
05/03/2026

Which would you want?

Dark colored lines representing the torque and horsepower of motorcycle “A”
143.90 torque
135.69 horsepower

OR

The light gray lines representing the torque and horsepower of motorcycles “B”
137.67 torque
142.43 horsepower

Let’s vote in the comments below!
Almost perfect opposites where horsepower and torque numbers are switched.
-Note-
It is just a coincidence that all lines intersect at 5252rpm. Horsepower and torque from each bike will always cross there but for bike “B” to overtake bike “A” at that same point is just by chance. That’s how these particular motorcycles happened to compare to each other.

Cars. Motorcycles. Trucks. Boats. It doesn’t matter. All shops get calls like this.
04/26/2026

Cars. Motorcycles. Trucks. Boats. It doesn’t matter. All shops get calls like this.

The mythical perfect cam for everything...🥴

If you understand the science of horsepower, you know the real reasons why the perfect camshaft for every combo cannot be made.

04/23/2026

Evolution Softail Springer with long open drag pipes.

The M-8 platform may be high tech and fast but it’s definitely not as cool as this old school Evo.

https://www.facebook.com/share/p/1FgtzQth7n/
04/21/2026

https://www.facebook.com/share/p/1FgtzQth7n/

This Saturday is Spring Training 2026. It is your chance to get your cars, your team and yourself ready for the 2026 season.
Gates will open at noon.
Bring the cars, bring the bikes, bring the dragsters. Your new season starts this Saturday.

I‘ll explain more on this Gen 2 m-8 cylinder head photo at another time. Why add performance products To your motorcycle...
04/19/2026

I‘ll explain more on this Gen 2 m-8 cylinder head photo at another time.

Why add performance products To your motorcycle?

To make it faster? Ok.

To make it more fun to ride? Terrific!

To beat your friends in a race? Great!

To have an impressive number on a piece of paper? Well that’s just stupid.

I’ve voiced my opinion on this before. The largely recent trend of the need for a dyno sheet with a number on it is disturbing. It’s the big topic and plastered all over the internet is (some realistic, some bogus and inflated, and some quite fanciful) dyno results like it’s some badge of honor. Don’t get me wrong I enjoy a good healthy engine and dyno number, but the dyno is, was, and always will be just a tool. A tool for tuning and development. The numbers themselves have relatively little to do with actual performance. (Shhhh, listen quietly and you can hear the keyboard warriors lose their minds and click-clacking away with hate).

I’ve just got done watching a video from Brian Lohnes called “Harnessing Hell” parts 1 and 2. That has inspired me to write this. He talks about clutch management of top fuel dragsters but the concept is the same. The engine horsepower was not the deciding factor for who won races. It was how much power made it to the ground and how good the driver could handle it.

Want to be laughed out of a room go to a group of racers and show them your dyno sheets and say that proves you are fast.

Back in the day there was not widespread dyno usage. You proved yourself on the street or better yet on the track. You practiced you skills (yes, skills). Tuned the car (motorcycle) for the track and conditions. You worked at it. Honed it. Perfected it.

Today. None of that seems to exist anymore. Some piece of paper says I’m fast so it must be true. Sorry. Real life doesnt work like that.

Im not saying don’t modify your bike. I’m saying modify it to fit you and what you are going to actually use it for. Don’t get caught up with internet dyno numbers. I’ve seen plenty of big powered bikes that were slow turds and/or riders that could not hope to utilize the power they had and spent crazy money on. Further, Big powered bikes usually mean big headaches as well. Just as with everything once you start pushing the limits of the design things like comfort, rideability, and reliability all go out the window.

My suggestion is to first practice being fast. Real practice. Preferably with some sort of timing system like a draggy unit or actual drag strip. Modify in stages getting use to working with each combination. Learn the bike. Learn what it wants and when. Strip weight away. I can’t stress that enough. There are so many bikes out there with 120-140 ft/lbs of torque that are so weighed down with garbage they barely move. Especially when not ridden correctly.

That’s why the picture of John Milner and Falfa racing. Falfa had the big dollar big horsepower car that he could not control and he wrecked. John wins with his small block and experience. That type of thing happens in real life. Don’t be a Falfa. Be a Milner.

To my new customers and Facebook followers!Hello!  I have gotten a lot of new followers to my page recently. I ...
04/16/2026

To my new customers and Facebook followers!

Hello! I have gotten a lot of new followers to my page recently. I would like to invite you to scroll through the past posts on this page. I often post technical information about motorcycles, race cars, hot rods, and engines in general. I’m sure a lot of the keyboard warriors out there would love the chance to tell me I’m wrong. It makes for great entertainment for me and others that read that stuff.

While on the subject, I also have a Youtube channel. Just type in Rageracing6435. Or click the link in the comment section below. It has been about a year since I’ve posted new content (more on the way) but that channel is dedicated to some real science of race cars and modified Harley-Davidson motorcycles. It’s not perfect but I’m trying to improve. Please watch and subscribe.

Thank you to my past followers and customers for years of dedication and thank you to my new followers and customers for the years to come.

See that angle of the pushrod as it is in relation to the rocker arm?That is most likely your “ticking“ noises on your M...
04/11/2026

See that angle of the pushrod as it is in relation to the rocker arm?
That is most likely your “ticking“ noises on your M-8 Harley.
Front Exhaust is the most severe
Rear Exhaust second worse
The intakes still have an angle but not as pronounced.
The exhaust angle slams the rocker arm to the left side of the bike.
The intake angle slams the rocker arm to the right side of the bike.
To make matters worse the M-8 has the worst rocker support of any Harley (any engine?) ever. Only half a circle acts as the bearing surface for the rocker arm to rub against. Combined with this angle the rocker stands cast into the heads take a beating and wear out fast.
The fix? Sorry, no fix yet. Maybe I’ll invent something.
The Bandaid? Properly shim the rocker arm endplay so at least the rocker won’t build speed and momentum as it is slammed over and over again into the support.
Harley service manual says proper endplay should be between .004“ to .015”
First of all that is B.S. Second, I have yet to find a stock M-8 with less than .010. Usually they are between .011“ to .016”.
I like to shim them to be between .005“ to .010”
You have to put the shims on the opposite side of the thrust surface. So that means the exhaust rockers get the shims on the right side. The intake rockers get the shims on the left side.
oh my goodness the information i give away for free.
Old man rant here, “Back in my day we had to figure this stuff out ourselves!” 😄

Address

38 West Division Street
Coal City, IL
60416

Opening Hours

Monday 10am - 6pm
Tuesday 10am - 6pm
Wednesday 10am - 6pm
Thursday 10am - 6pm
Friday 10am - 6pm
Saturday 10am - 2pm

Telephone

+18153706435

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