Engine Mechanical TopicsDiscussion 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.
I guess what I'm asking is - will l get more TQ/HP with the 10-1 comp pistons and the bigger cam than I'm already getting with the bolt in EV13 in my stock motor?
Originally Posted by Adam76
So it looks like from what you're suggesting, you can't beat the Woods cam at 10-1 for overall performance?
Not in a heavy bike.. The Woods cam would not be the best down low.. It really didn't come on strong till 2700 Rpm unless you bump the compression to 10.5:1.. Then it'll start to hit around 2550..
As others have asked what power are you looking for and at what RPM..
Can't answer your question but your post brought back a old "turning point" memory of my then new 97 evo Heritage and my first mountain 2 up stock bike, full bags and luggage. loaded down road trip.
Out of 20+ friends bikes I was full throttle but in last place headed up the I-26 hill near Asheville NC with only a 4 speed Vulcan behind me... This was long before Google so I told my mechanic my last place, big hill story and he suggested a Andrews EV-27.
After that EV-27 cam and a replacement S&S carb and a few other goodies I was never in last place again!
I still have that bike and still feel that cam was the best thing I have ever done to a bike!
Good luck with your top end build OP....
Last edited by Soundman5000; 08-20-2024 at 07:38 AM.
Not in a heavy bike.. The Woods cam would not be the best down low.. It really didn't come on strong till 2700 Rpm unless you bump the compression to 10.5:1.. Then it'll start to hit around 2550..
As others have asked what power are you looking for and at what RPM..
OK thanks. 👍
I'm looking for most TQ somewhere between 2000 - 5000rpm I guess where most people would ride.
..... The thing I like about the Woods cam is that it has earlier cylinder fill with higher TDC numbers which does make a difference.. I ran it and I thought it was awesome but that was in my Fatboy not the heavier Road King..
Hey 98hotrod.
The EV13 cam is actually a decent bolt in cam for a bagger. So if I'm going to go with a different set up to make more overall power, I want to make it worth while...
What do you think of the Woods little W6, or maybe W7 ?
High comp pistons and some mild head work (just bigger valves & valve job really) are obviously part of the equation
Set up correctly ** which cam would maximise 2200 - 5000rpm TQ/HP ?
Both those cams would need at least 10.7:1 compression to take advantage of the grinds... But neither of them are a low to mid-range cam they're both mid to high.. I've never used a W7 so I can't vouch for it but looking at the numbers I would say if that cam came on at 25-2600 I would be surprised there's a lot of overlap and duration, I don't see it as a low end cam.. Also would like to add that the W6 would be my choice over the W7..
As for the W8, yeah I had a lot of experience with that and it's a hell of a cam at about 3,000 RPM right up to 6500.. It's great for power, it's the most powerful cam I ever had in an 80" Evo.. With the right compression, carburetion, air intake, heads and exhaust that can be very powerful setup.. I actually beat up on a newer CVO street glide with that setup..
To get it to this point you're looking at $4,500 to $5,000... You want to play you got to pay...
Last edited by 98hotrodfatboy; 08-24-2024 at 07:15 AM.
The Wood W6 would be ok and is a bolt in cam. I've never run it but they say the power starts at idle and last through 5500 RPM's. It is a bolt in cam so OEM springs are ok. They tend to be noisy because of agressive ramps. The W7 closes the intake way too late for a heavy bike.
The W6H has the same opening and closing specs, but it has .590 lift so it's not a bolt in cam. And it would require roller rockers and major head work and compression to work correctly.
From the Wood site, THE W6 "BOLT IN STREET/TOURING. VERY STRONG FROM IDLE THROUGH 5,500 RPM. LIGHT OR HEAVY BIKE"
"MOST ADVANCED POWERFUL TORQUE CMA AVAILABLE ANYWHERE. 80 CI WELL OVER 100 LBS. TORQUE"
W6H 20/40 - 42/18 240 - 240 .590 - .590 .192 - .179
"W7 BOLT IN 2,000 - 6,000 RPM. GREAT SOUND @ QUICK RAMPS - HOT STREET CAM"
The W7 closes the intake too late (46) and would not be ideal in a heavy bike because you would lose low end torque. They claim the power starts at 2200 but I'd guess it's closer to 2500 unless everything else (exhaust, heads, ignition and carb) is perfectly matched.
I think you already have a very good cam for the bike you have, any gains with a cam swap will be marginal unless you give up low end torque.. If you want to make more power, you will need to think about a larger displacement engine. Like stroking the one you have or an S&S replacement, available in V111 cubic inches etc. You need to think about realiability if you plan on riding the bike on long trips, touring etc. If you want a TT (tavern to tavern) bike, get a lighter bike like a FX or Sportster and hotrod it.
@pgreer
Hey Paul, yes the W6 has very good Manors in the low RPM range but it's really not a low end cam like the EV13.. In fact W6 comes on just a tad later than the EV27.. I ran that cam for a very long time and it loves compression.. It will do ok at 10.0:1 but truly favors 10.3-10.5:1 and will come on strong at 2800 rpm..
Agreed, that's why I mentioned he already has a very good cam for the bike he has. Any gains further up the RPM's will mean sacraficing down low. I like the specs on the EVL3010 you suggested, but any gain would be minimal at best. It's a lot of money for a marginal gain.
I'm running a Crane 300-2b which has similar specs in my EVO Heritage and an very happy with it. My only comment is that it doesn't pull hard to 5000. So I would like more in the 3500+ RPM range, but I don't want to give up the acceleration from a stop. You cant have a stump puller (which a heavy bike needs) and a drag engine at the same time without making it larger, which is what he wants to achieve.
08-20-2024, 07:26 AM
