what cam for slow technical trail riding and maximum torque

A cam doesn't alter compression. It simply changes the duration of the valves being opened n closed. 

I find that my rhino has the most power between 8-30 mph. That's with a stage 2 cam and being snorkled. I know the snorkles are hurting performance, but I water ride so I won't change it. Now, that being said, I really can't wait till you write your review of the stage 1 or raptor stock cam. I'm really looking into changing mine to that one for more off idle grunt. Since you trying it first, I'll wait for your results. 

Please reply soon. Lmao

thekevin wrote:

i rode in thepaynes rhino today with the stage 2 and it still didnt have the torque i am looking for.  i cant wait for the 22nd, i think that raptor cam is going to be the answer.

Kevin, would you do me a favor and perform a compression test before and after you have the cam installed, using the same techniques (cold engine, wide open throttle, etc.)?

I'd be real interested in the results

08Rhino450SE wrote:

thekevin wrote:

i rode in thepaynes rhino today with the stage 2 and it still didnt have the torque i am looking for.  i cant wait for the 22nd, i think that raptor cam is going to be the answer.

Kevin, would you do me a favor and perform a compression test before and after you have the cam installed, using the same techniques (cold engine, wide open throttle, etc.)?

I'd be real interested in the results

 I'd be interested in this also I never did a before but I installed a hotcam 4100-1 and did one after and come up with I believe 125ish with engine hot wide open throttle.  Yamaha says it should be up around 180 so I assume the cam is bleeding some off or I cant get by the decrompression or the engine is worn.

08Rhino450SE wrote:

Polarblu wrote:

Finally a decent answer!! Now carry on in that respect and quit just throwing out arrogant statements without the homework to go along with it ! 
Also if you have the cam specs for these stage 123 and mud buster cams we can see just how this comes into play. I can't find them but you will see that the duration of overlap is greater and in all cases raises the rpm and narrows the usable power and DECREASES the compression.

throwing out arrogant statements?
i repeat: WTF???
and you want me to do a worksheet for you? dis ain't high school, blu, and the statements i make are fact unless you want to debate them,
but you could be a little more civil in your "tone."
just because YOU don't know what you're talking about doesn't mean i don't, and no, i don't have to explain myself to anyone, especially someone that doesnt want to show me a modicum of respect. (look it up)
oh yeah - i forgot - you want me to look that up for you, too, don't you?

read this and get back with me when you understand it: http://en.wikipedia.org/wiki/Bernoulli%27s_principle

contrary to popular opinion, NOBODY OWES YOU ANYTHING

Such a grumpy old prick!! 

thanks! it takes years of practice and drinking heavily

guess I have the only engine that didn't loose compression.. 125 before and 125 after... hmmmmmm

banchee6 wrote:

guess I have the only engine that didn't loose compression.. 125 before and 125 after... hmmmmmm

 I never did a before so maybe im seeing the decompression but according to the manual it should be 180ish.  Kind of wish I did a before measurement.

I rode I Kevin's rhino with the stock raptor cam in it today and it was pretty smooth but you could definitely tell a difference in the two cams and the rpm ranges they like to operate in. It still got sideways with the two of us in it on dirt road and I was little puckered up when your drivers riding one handed!! It's a smooth overal delivery all around and not an explosion like before with stage3 and may get better has we keep tuning the fuel map some more this weekend when we ride. We will likely line them up again and see who takes the cake he thinks I'll win but I'm not sure I can overcome his 11:1 compression and stock raptor vs my stage2 cam and factory compression and the fact I've got prolly 200lbs more weight on mine. We did hit 56-61mph with some dips in the road in his.

Nice write up. 
I was curious how the cams changed the power. How would you compare it to the milder Raptor Stage 1/ Rhino Stage 2?

Thats what I run and I personally like mine better and after Saturday we will see who's faster I guess.

it is such a smooth power curve, you just give it gas anywhere in the rpm range and it goes.  like rodney said its not near as explosive as the stage3 but for the direction i am heading now i thinks its going to be perfect.  i think me and rodney are going to be pretty even up to about 35 and then i expect him to pull me.  as far as compression goes it didnt change any, just over 120 before and after.

thekevin wrote:

as far as compression goes it didnt change any, just over 120 before and after.

i think you mean cylinder pressure

http://www.enginebasics.com/Advanced%20Engine%20Tuning/Static%20vs%20Dynamic.html

yes, pressure was the same.

08Rhino450SE wrote:

thekevin wrote:

as far as compression goes it didnt change any, just over 120 before and after.

i think you mean cylinder pressure

http://www.enginebasics.com/Advanced%20Engine%20Tuning/Static%20vs%20Dynamic.html

I think the only way to accurately measure the compression, cylinder pressure, bang box, whatever you want to call it (lol) you need to pull the pin on the decompressor.  The decompression system only works under a certain rpm, until the weights open up and allow for regular valve operation.  

Mine shows somewhere in the neighborhood of 110-120 psi when with the decompression system operational.  I've never bothered to disable it to really check it because it runs fine.  

It was the same on my 660 raptor.

sorry for the rants, guys, but i need to make a clarification.
after being sidetracked by a post i forgot the most important point:

compression ratio is not determined by a compression test. a compression test measures cylinder pressure.
in order to determine compression ratio you have to cc the head (measure the volume) and use the cylinder bore and stroke in the calculation listed below from wikipedia.

The ratio is calculated by the following formula:

, where = cylinder bore (diameter) = piston stroke length = clearance volume.
It is the volume of the combustion chamber (including head gasket). This is the minimum volume of the space at the end of the compression stroke, i.e. when the piston reaches top dead center (TDC). Because of the complex shape of this space, it is usually measured directly rather than calculated.

in my initial post i was not trying to be clever or anything. without knowing the mechanical abilities of kevin or rodney, i was trying to save them the expense of blowing up their engines. i merely referred them to someone who has experience in building engines to double check their procedures.

Denny I wondered when I would ever in life get to use all that Math crap in school but I am affraid this ain't going to be one of them!! Nah you didnt hurt my feelings any I leave ALL my work to my Yamaha Pro Dealership mechanics and why I buy extended warranty and full coverage insurance . I learned a long time ago when I did some shade tree mechanic work on my own stuff and screwed it up that its much better to blame someone else than yourself!!

Banchee I am super happy you suggested the stock raptor cam.  I have over 100 miles on it now and autotune has my tuned lined out and this thing runs exactly like what i wanted.  It has instant go power anywhere you give it gas.  Hopefully I am only about 2 weeks away from my custom cage and bumpers, lift, new tires.  Here is what autotune did for my setup with the raptor cam.

I am ready to ride in it now you got the fuel map lined out I know when I rode in it the day they swapped cams with me and you both it felt really smooth and nice and like you said instant go from dead stop or anywhere in the rpm range.