What is the best Cam for a stock Evo?
EV-27 is surely the most popular cam for otherwise stock Evos. Anything with more duration/later intake closing will kill bottom end torque on a stocker. I myself went for the EV-13. More low to midrange than the 27 but not as much midrange to high speed. But I never race anyone, anyway. And the 13, if anything, improved my gas mileage.
Does headwork make a difference from 88 to 95?
When I went from 88 to 95, I also got headwork done. Not sure which had more of an impact, but the combo really seemed to make a big difference. Stage 1, gear cams not so much...
Do you need milling for a classic V8 head?
Depending on the amount of material removed, the intake may also require milling to compensate. To help you determine the proper milling specifications for factory heads on popular classic V8s, we’ve included the chart below.
How does a small combustion chamber produce the most horsepower?
In theory, forcing air and fuel in as small a combustion chamber as possible (measured in volume) will yield maximum engine compression and horsepower. There are a number of ways to accomplish the task.
How much horsepower does a 80 cubic inch Harley have?
The current 80 CID engine using stock Harley-Davidson cases, cylinders and heads is able to produce 95.3 Ft. Lbs. of torque at 4700 rpm's and 95.3 Horsepower at 5700 rpm. The power comes on unbelievably strong between 4000 and 6000 RPM.
How do you CC a Harley-Davidson head?
0:522:44How to Measure Combustion Chamber Volume: Cylinder Head 101YouTubeStart of suggested clipEnd of suggested clipYou just dump it in the top of the burette. With the burette. Check valve closed. And you fill itMoreYou just dump it in the top of the burette. With the burette. Check valve closed. And you fill it all the way up to the zero.
What was the last year for the Harley Evo motor?
In 1999, it was replaced by the Harley-Davidson Twin Cam 88 in the Touring and Dyna model and in 2000 in the Softail models.
How do I know what Harley Evo engine I have?
0:001:02Evo Motor Early or Late Model Engine Identification Evolution - YouTubeYouTubeStart of suggested clipEnd of suggested clipIf you have early evo you will have the 5 16 hole which is the smaller one the later evos have a 3 8MoreIf you have early evo you will have the 5 16 hole which is the smaller one the later evos have a 3 8 hole for the breather. Another way is in the block you'll have this tube for breathing.
What size combustion chamber do I need?
How Do You Size A Combustion Chamber? All of the combustion chambers in an engine must have the same volume, to within 0.25 CCs (cubic centimeters) of each other. This way, the compression ratio and the timing of ignition remain uniform across the chambers.
How do you calculate the combustion chamber?
How to Measure Your Combustion Chamber VolumeThe cylinder volume [(bore ÷ 2)2 x 3.1416 x stroke x 16.387]The clearance volume [(bore ÷ 2)2 x 3.1416 x deck height x 16.387]The gasket volume (bore ÷ 2)2 x 3.1416 x gasket thickness x 16.387]The chamber volume, Value from manufacturer confirmed through measurement.More items...•
What is the most reliable Harley engine?
But arguably its biggest leap forward in terms of reliability, Baggers reports, came in 1986. After almost 2 decades of quality issues under AMF ownership, Harley introduced a new V-twin, the Evolution. The 'Evo' is often considered to be what truly saved the company in the 80s, Cycle World explains.
How many miles can a Harley Evo last?
How Long Do Harley Engines Last? A Harley Engine is expected to last over 100,000 miles if the bike is well maintained as per Harley-Davidson's suggested service schedule with fluids rotated regularly, if it's stored and ridden responsibly, and if the motorcycle isn't involved in any accidents.
What is considered high mileage for a Harley?
For sports bikes, 25,000 miles can be a lot. Harley-Davidson® motorcycles are built to last much longer. If a bike has good maintenance records, no signs of damage and no oil leaks, even a bike with 40,000 to 50,000 miles can be expected to last a long time.
How do you tell what year my EVO motor is?
The numbers were the last stream of the 17 digit bike vin that the engine belonged to. The bike year/model would be in the beginning of the vin, which you won't see.
How do I know what kind of Sportster I have?
Sportster VIN Numbers 1970 thru 1980 Sportsters First two digits of the Harley VIN are the model code. Example: 4A 12345H1 is a XLCH 1981 to 1985 Sportsters 5th and 6th digits are the model code. Example: 1HD1 CD HY15B123456 is a XR1000 1986 to 1996 Sportsters 5th, 6th and 7th digits are the model code.
What year did Harley start putting VIN on frame?
Starting in 1970, The official VIN location moved to the frame neck, and it has remained in that location ever since. From 1970 - 1980, Harley continued to stamp a matching VIN on the motor (except for early 1979 models), so that the motor could be matched to the frame.
What is milling cylinder heads?
Or you can mill the heads. Milling involves removing material from the cylinder head (or block deck surface where the heads and block meet) to effectively reduce the volume of the combustion chambers.
Why squeeze air and fuel in combustion chamber?
The reason is simple: The more you squeeze the air and fuel mixture in the combustion chamber, the more power you can create. In theory, forcing air and fuel in as small a combustion chamber as possible (measured in volume) will yield maximum engine compression and horsepower. There are a number of ways to accomplish the task.
Does milling affect intake manifold?
Keep in mind, milling changes the relationship between the heads and/or block and the intake manifold. Depending on the amount of material removed, the intake may also require milling to compensate.
Can you use dome pistons in cylinder heads?
You can buy cylinder heads with small volume chambers already cast or CNC-machined in. You can use dome pistons to effectively reduce the volume of a large combustion chamber or even choose thinner head gaskets. Or you can mill the heads.