97 Ultra with stock evo Cam question : V-Twin Forum: Harley Davidson Forums

pulidog830 · 10-14-2009, 05:41 PM

I wanted to get your thoughts on putting a Andrews 27 Cam in my bike. Can just the Cam make an improvement or
would I need any other work on the motor. If so, What? if not what will I gain over stock set up. I do have a SE air cleaner, Power commander and Kerker Pipes. Might I add that cost is a factor. I just need more torque to pull through the hills, mountains, and passing without shifting up and down all the time, especially when 2 up. I dont need high performance just better performance. I just want the best bang for the buck. Thanks for any input

Hillside · 10-14-2009, 08:04 PM

The Andrews 27 is a great choice, and yes you will feel a good gain, BUT if you were to re-surface the cylinder heads, at least -.060", you will unlock the true potential of what that cam can do for you.
BTW, a Wood 6 is another viable option as well.

Scott

gsxrboy96 · 10-14-2009, 10:51 PM

That cam is a night and day difference in the way your bike will run, and like hillside said, take a lil off the heads to bump the compression, and the bike really comes alive, chad.

head · 10-14-2009, 11:35 PM

i had always heard that the ev23 would give you more torque than the ev27? even new a few guys that took the 27s out to put the 23 in. ive got the ev23 in my 98 road king evo and love it. just something to consider. i thought the powerband on the 27 was at a higher rpm level.

shaving the heads to raise compression, are there any other mods that have to be done to do this? how much does it raise the compression?

head

Hillside · 10-15-2009, 07:30 AM

A precision valve job would also help, but as far as re-surfacing the heads, a good bet is to cc while doing so.

Scott

blackjackcustms · 10-15-2009, 02:06 PM

An EV27 is a pretty tame cam, I can't imagine anything tamer being wise. I personally think the 27 is what H-D would choose if not for the government. If you plan NO other changes except for taller gearing, maybe the 23 is better, otherwise, I see no good reason to go milder than the 27.

I dont like andrews cams in general, because I have degreed a stack of them and found them to be up to 4 degrees off either way. Keyed cams are way more precisely timed, and are a good bet if you wont be degreeing them. Maybe it's nit picky, but if you bump your compression, and your particular cam is off by 4 degrees, you might get some pinging, or if it's the other way, you might be tempted to go to a 23?

pulidog830 · 10-15-2009, 05:45 PM

Hillside
What is CC? I'm not down with all the abbreviations yet.
Thanks

hightop · 10-15-2009, 06:23 PM

Not Hillside, but CC is cubic centimeters, and to "cc" is to measure the volume of the combustion chamber in cc's, to determine the compression ratio, and insure both heads are the same volume. Hope this helps!

Hillside · 10-15-2009, 08:15 PM

hightop is right on, but to elaborate more, it is done with a liquid that is in a guaduated burette, that allows the liquid to be precisely metered when coming out, and filling the combustion chamber, while it is capped off with a clear, plexiglass plate. Very staightforward process.

Scott

stroker93 · 10-23-2009, 02:40 PM

The EV27 has little overlap to it,,thus giving a little more torque,its a standard bolt in cam,,not needing head work ( coil bind,piston clearance)..It will add static compression and with shaved heads ,,harder on starters..Also a little noisier than stock,,tis is not a radical cam,,,very useable power range..
Dave

pulidog830 · 10-23-2009, 03:57 PM

Thanks For all the input. At this stage and all I have decided to go the very conservative route and do just the Cam A-27 Cam, bearing and push rods. I will see where that take me. The stock set up has taken me 12000 miles to change.
Thanks again all