Camshaft selection
Lookin to install a cam in my '97 heritage w/21,000miles. Would like to find a parts list to do the job. Any and all recommendations will be greatly appreciated.
The bike has Samson longhorn exhaust, other than that is complete stock.
The bike has Samson longhorn exhaust, other than that is complete stock.
Heres a post by Road Hog, 3 yrs ago.. its in the EVO section in here.
You know this subject has been coming up for years. The majority will say EV-27 because it's a great bolt in cam for easy quick performance. It will lower the static compression a little. The cam will perform much better than stock but never really reach full potential unless you increase compression.
Baggers usually don't hot rod around like the lighter bikes because of the weight factor and handling characteristics. They are big sleds that just putt and need Torque in the lower RPM ranges to get them moving. The EV-13 does just that. The two cams are very similar in performance only the EV-13 comes on a little sooner and finishes sooner. So if your not running the RPM's up all the time then the cam that gives the gain in the lower ranges is what you should choose. The EV-13 also helps the EVO to run cooler because of the exhaust valve timing. The EV-27 will out perform the EV-13 just a little but you have to get on the bike to notice the gain, is this how you want to ride. If you ride 75-85 on the highway then go with the EV-27, if not go with the EV-13, it's meant for Baggers that ride two up, loaded down with gear and sometimes pulling a side hack.
Also remember a bagger has lower gearing than EVO Softails. If you put a EV-13 in a Bagger and a EV-27 in a Softail and all other things are equal, the Bagger will pull away from the Softail. The Softail will walk the Bagger at 75+.
The EV-27 utilizes steeper ramps so the valves are more noisier than the EV-13.
Remember the Pass A Truck Kit by Mikuni years ago? Joe Minton is a long-time Harley guru who developed the EV13 cam specifically for Mikuni's "Pass a Truck" kit.
At the time, Harley was selling a Screamin' Eagle kit with a racing cam included for the rider who wanted a little more oomph, especially those on baggers with a 180lb old lady on the back, who wanted to be able to zip around 18 wheelers without a lot of effort. The riders who bought Harley's kit found they had to downshift anytime they wanted instant power, even at highway speeds, and that they'd spent all that money to end up with a bike that was even worse than the stock setup for the way they rode.
The reason he didn't use any other existing cam at the time (1987) was because they all closed the intake too late for a rider to be "on the the cam" at lower rpm (2000 to 3000rpm). Minton found that any cam that closes the intake later than 34 degrees ABDC does not make good low end torque. And I believe that is true. But reasonable people can disagree, right?
I'm not saying the 27 isn't a good cam. Lots of guys love it, and it does make reasonable enough power below 3000 to be a good everyday cam. But it's a compromise for the guy who wants a racy cam without losing the ability to cruise around town in a relaxed way. If you don't care about racing, the EV13 is the better low end cam.
Some helpful information from one of the best performance sites on the web; http://www.nightrider.com/biketech/hdstage2.htm
http://www.nightrider.com/biketech/selectcam.htm
Hope it help ya.
.
You know this subject has been coming up for years. The majority will say EV-27 because it's a great bolt in cam for easy quick performance. It will lower the static compression a little. The cam will perform much better than stock but never really reach full potential unless you increase compression.
Baggers usually don't hot rod around like the lighter bikes because of the weight factor and handling characteristics. They are big sleds that just putt and need Torque in the lower RPM ranges to get them moving. The EV-13 does just that. The two cams are very similar in performance only the EV-13 comes on a little sooner and finishes sooner. So if your not running the RPM's up all the time then the cam that gives the gain in the lower ranges is what you should choose. The EV-13 also helps the EVO to run cooler because of the exhaust valve timing. The EV-27 will out perform the EV-13 just a little but you have to get on the bike to notice the gain, is this how you want to ride. If you ride 75-85 on the highway then go with the EV-27, if not go with the EV-13, it's meant for Baggers that ride two up, loaded down with gear and sometimes pulling a side hack.
Also remember a bagger has lower gearing than EVO Softails. If you put a EV-13 in a Bagger and a EV-27 in a Softail and all other things are equal, the Bagger will pull away from the Softail. The Softail will walk the Bagger at 75+.
The EV-27 utilizes steeper ramps so the valves are more noisier than the EV-13.
Remember the Pass A Truck Kit by Mikuni years ago? Joe Minton is a long-time Harley guru who developed the EV13 cam specifically for Mikuni's "Pass a Truck" kit.
At the time, Harley was selling a Screamin' Eagle kit with a racing cam included for the rider who wanted a little more oomph, especially those on baggers with a 180lb old lady on the back, who wanted to be able to zip around 18 wheelers without a lot of effort. The riders who bought Harley's kit found they had to downshift anytime they wanted instant power, even at highway speeds, and that they'd spent all that money to end up with a bike that was even worse than the stock setup for the way they rode.
The reason he didn't use any other existing cam at the time (1987) was because they all closed the intake too late for a rider to be "on the the cam" at lower rpm (2000 to 3000rpm). Minton found that any cam that closes the intake later than 34 degrees ABDC does not make good low end torque. And I believe that is true. But reasonable people can disagree, right?
I'm not saying the 27 isn't a good cam. Lots of guys love it, and it does make reasonable enough power below 3000 to be a good everyday cam. But it's a compromise for the guy who wants a racy cam without losing the ability to cruise around town in a relaxed way. If you don't care about racing, the EV13 is the better low end cam.
Some helpful information from one of the best performance sites on the web; http://www.nightrider.com/biketech/hdstage2.htm
http://www.nightrider.com/biketech/selectcam.htm
Hope it help ya.
.
You mentioned your bike is completely stock except for pipes. Adding a heavy breather air cleaner and fuel management would complete the stage I. Doing this would enrich your AFR and help lower your engine/oil temperature. Just a suggestion.
You may also want to watch YouTube videos on cam changes in a Heritage. It can help with the tools and parts you need. Do you have a service manual for '97 Softails?
Good you are doing your research, use this list as a reference
http://www.nightrider.com/biketech/camdb.htm
I have found this website to be very informative.....
http://www.nightrider.com/biketech/camdb.htm
I have found this website to be very informative.....
air in air out...the better you can achieve this the better your engine will run...
Last edited by Tech Slap; Mar 10, 2014 at 09:26 AM.
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