NEUTRAL Pro 800 DYNO Tests Comparing Stock Head Vs. RK Tek Patented Head

[RKT]

I NEVER like to post dyno sheets unless they come from a respectable NEUTRAL dyno facility..

With this way, I think it lends credibility to the dyno test!

Remember, ALL dynos can be made to read whatever number you wish.. You can Ask DynoTech Research about this and Jim can explain it to you.


Well a dyno facility (very distant) did some testing on a 2012 Pro 800 Assault at sea level and compared the stock head (STOCK COMPRESSION RATIO) against the RK Tek Patented Head Design (AT STOCK COMPRESSION RATIO).


The results speak for themselves..


You can check it out here if you wish http://www.2strokeheads.com/Polaris800CFI.htm

 

[Stewy]

Pretty impressive gains. Do you make a low alt head for the 13 Rush 600 ? If you do what kind of gains are typical?
Thanks

 

[snowman80]

Am I the only one who can't find the dyno sheet anywhere on the website? I am really interested in seeing it.

 

[iluv2fly]

Click on the link in the first post and it has the dyno sheet

 

[snowman80]

I don't know what's going on, maybe it wasn't meant to be for me but I can't find it. It doesn't come up when I click on the link, it just comes up with the page for the head. I've looked on about every other page on their website too.

 

[yamazoom]

I don't know what's going on, maybe it wasn't meant to be for me but I can't find it. It doesn't come up when I click on the link, it just comes up with the page for the head. I've looked on about every other page on their website too.

Click on this link and scroll to the bottom of the page.

http://www.2strokeheads.com/Polaris800CFI.htm

 

[snowman80]

Click on this link and scroll to the bottom of the page.

http://www.2strokeheads.com/Polaris800CFI.htm

There's just the three pictures?

 

[snowman80]

Alright my stupidity has gone on long enough. Still can't find it but oh well. As I always say you can't fix stupid, I was just hoping I wouldn't ever say that about myself. Thanks for trying to help

 

[sleddin pete]

Do you have any testing at the altitude that most of us ride at,8000 feet and up.

Thanks,
Pete

 

[RKT]

Do you have any testing at the altitude that most of us ride at,8000 feet and up.

Thanks,
Pete

Yes, much testing at those elevations since that is where we ride as well..

The dyno testing was done at sea level with un altered compression ratio because many people think that the gains from the head are mainly due to the increase in compression ratio . So, this shop wanted to see if that was the case.

So, testing the head at the same compression ratio, simply a different combustion chamber design, will show the real power increases (if any) to be gained.
As you go up in elevation, there is no doubt that the stock head will not be optimum for the higher elevation and that an increase in compression would surely be beneficial..

So, if you are making good power gains, across the entire rpm range, with a better head design, at sea level, then using this design at elevation WITH a compression increase will be just that much more increase..
Meaning..if you can make power at stock compression ratio then you can surely make even MORE power at elevation with a compression increase..

This is also what we see in our testing..

Now, install a better piston, ater the port timing a bit, and you have the recipe for a very good boost in power..

 

[Boston Racing]

Alright my stupidity has gone on long enough. Still can't find it but oh well. As I always say you can't fix stupid, I was just hoping I wouldn't ever say that about myself. Thanks for trying to help

It is not a graph like a typical chart. Lets see if this works.

This is the before

And After

 

[PaulAnd]

Rktek, is that dyno with just the head swap or your piston/head combo? Does your piston change port timing? Would like to see those numbers also.

 

[crashnbash]

What fuel was the test performed with? If the fuel contained ethanol what percent of the fuel was ethanol? Will a fuel box be needed or does the stock map have enough room for the slight increase in fuel needed? The amount of knock reduced is impressive.

 

[yooper 8]

I am very interested in this RKT. Was the test done everything stock, other than the head? If we send in our head for cheater mod, can we bolt it right back on with stock pistons, mapping, etc. and expect the performance shown on the tests? What about going from 2000 ' at home, to 8 to 10,000 feet on trips out west.......any changes need to be made? I am ready to send you the head from my 13 Pro.
Thanks

 

[Going West]

Al these questions are answered on his web site.

 

[RKT]

This testing was all done on pump gas with a 100% stock engine.

Our "Drop In" kit simply takes it to he next level.

Having said that, I still feel, very strongly, that the OEM pistons are a problem.. I get far too many calls and have seen too many failures.. Even if the piston has not completely failed, if you measure the piston it is usually WAY out of tolerance after a short time of running. We have seen this countless times.. The Wiseco pistons will suffer skirt collapse usually within 200 miles on a decent size bore..

Yes, the cheater head offers the same performance.

We have quite a few new "projects" in store for the 800 this season..

We are doing our best to try and get this power-plant to produce the power it should and be reliable. Testing continues all season..as usual with our shop.

 

[Snodawg]

Can you post the sheets for the 858 Big Bore Kit?

I have a hard time shelling out $2000 for " WILL produce the power you need!" if you know what I mean.

I don't really care what the number is (heck it could be 100 if the stocker is 80), I just want to see the gains throughout the RPM range.

 

[iluv2fly]

Pretty impressive gains. Do you make a low alt head for the 13 Rush 600 ? If you do what kind of gains are typical?
Thanks

Power addiction makes a great head for the 600 and gains with his head on the 800 make great power also.

 

[BGYDOP1]

Dyno//Can Threads

RKT Quote from Original Post-"Remember, ALL dynos can be made to read whatever number you wish.. You can Ask DynoTech Research about this and Jim can explain it to you."



Agree

 

[Fast_XC]

Notice the % knock number on the RKT head vs the stocker. It is very interesting. It should be a better running head even on lower octane gas, or you could up the compression some and get even greater gains. Maybe kelsey is on to something here....