Jared at JC Racing Engines has agreed to port the head off my 06 450r to get true horsepower and torque gains of good port work on the 2006 and up genII Trx450r. He has the origional dyno graph and it will be posted with the before hp and tq numbers. I will let SOYO tell you more about the modifications he is going to do to the head. This should be concluded in a couple of weeks.

nice one man!i for one am looking forward to seeing these results as im seriously considering some port work on my
hrc kitted 06...

They will be up next week

sweet,cant wait!

well we got the head today, it will end up having copper berilium intake seats with factory titanium intake valves and factory crf +1 exhaust valves. along with a serdi valve job.

i started on this tonight but one of the valve guides is bad and one of the berilium seats was the wrong size. so parts are on order and we should have results at the end of next week, unless things change!

he is also going to go with a 13.5:1 piston, but we haven't decided if we should do this first and post results for the piston only, or wait until the head is done and dyno'd then post the results for the piston. but we will decide soon and keep everyone up to date!

here is the dyno graph and the mods he has now are:

dasa pipe
hrc cam
uni filter
tokyo mods ign.
41mm fcr carb



graph: no rpm but peak hp was 8300 and peak tq was 6500

Sounds great....I look forward to seeing the results....Thanks

I know it would be a lot of work, but I'm sure people would really like to see a dyno comparison of just the new head and then both the piston and head. That way we know exactly what was gained by the head work.

well we wanted to do it that way but, last week he had transmission problems so we thought it was best that we go ahead and put the piston in it since he was going to a national this weekend. so we will post the results from the piston only first.

valve seats will be here wed. so we should have the results friday or saturday!!

This is very informative. I really appreciate threads like this.

nice thread so far cant wait to see the gains made... should be pretty damn nice lol !

wel hell i wouldnt have gone to the Ava national with a stock piston either ...lol

eager to see how this turns out, thanks Jared!

he is also going to go with a 13.5:1 piston, but we haven't decided if we should do this first and post results for the piston only, or wait until the head is done and dyno'd then post the results for the piston. but we will decide soon and keep everyone up to date!



this has been my problem, every time i do a head i end up doing a piston at the same time.
going from 10.5-1 to 13-1 and porting with +1 ex valves i useally see around 5hp

i then have then seen 3.6 from just another head alone

We are going to compare the dyno graph with the piston to the origional one in shown in the beginning of this post. I think it is 47.14 hp and 32 tq. It didnt feel like it had that much more power but it does pull better off the bottom with the piston so expect the torque number to be better. Once we have dynoed it with the piston we will put the head on it withe the same carrier and came and Dynol it again with the ported head to show both increases. This was the origianal Idea of the thread and the only reason the piston was added is the fact that I blew the tranny while practicing mx at Soyos track. Jared tore it down and had a new Trans in it the next day for a race memorial wekend.
There arnt many guys I know that would put a transmission out of one of there own motors in there friends bike so they could run a race with em the next weekend, Hats off to Jared of JC Racing engines!!

so your saying you see a 5hp gain from a piston and head work? and then same bike with another head make an additional 3.6hp for a total of 8.6hp from a piston and head work? who did the heads?

i have an idea of what i think the numbers will be but im not saying anything until its done. the bad part is the guy with the dyno will be getting back into town thursday, so i dont know if he will have time to get us in friday or saturday. but as soon as we dyno we will post the graphs.

yes.
i had a local builder do 2 heads for me. both with +1 ex valves. i never did before and after runs on the first build but i did on the second build. i gained 5.64 hp and 2.03 tq from the head and 13-1 piston.

then i swapped the head only, but... the next head also had +1 intakes and gained 4.10 hp and 1.65 tq this head was done by racers edge.

Was that on an 04 05 or 06 up?

04

Hawk thats greart info for all of the gen 1 04 05 guys, I cant waite to see what my 06 does. When The piston graph goes up it will be followed by the head graph. When I get some more cash I am going to add a custom grind web cam and bore the carb to 43.5. I am going to do those graphs one step at a time and continue the thread through those mods.

i would think the R/E head would have blowed away the local builders one based on the dyno sheets floating around

You would think

I am headed to the dyno it with the addition of the piston this morning, I well try to get it up this afternoon. The head horsepower dyno is scheduled for tommorow!

Here is the first graph with the addition of the 13 5 1 piston and vp113 race gas. Got as Close on the af as I could, it is 49.42 Hp 33.59 tq at about 8700 rpm




Cant wait til tommorow, what will it be???

WE HAVE THE RESULTS AND THEY ARE GOOD!! i think it needs a bigger cam but it still makes really good power with the hrc cam, so this cam has some potential. but we will try a bigger cam later. you can see in the gragh that it starts to flatten out, so with a better cam it should keep pulling and making more power. i think with a 43.5mm carb and a different intake it should be a runner for sure.

we started out with hrc cam at: 47.14 and 30.60
with the 13.5:1 piston we were at: 49.42 and 33.59
and with a ported head +1 exhaust: 54.15 and 34.97

so the final results with a piston and cam are: 7.01 hp and 4.37 tq which in my opinion is not bad at all.

results for just the head alone was: 4.73 hp and 1.38 tq

i thought that the piston itself was a really good gain, i thought it would have been less than that.

here is the final gragh:

I think the RE head gained 4.10HP over the previously ported so I would call that blowing away the other head

well either im reading it wrong or you are

but i see

local builders head gain 5.64hp
R/E head gained 4.10hp

what hawk meant was he gained 4.1 HP over the other head

lets please keep this post about this build!!

After months of waiting A local builder steps up and pulls 54.15 hp 34.97 tq with a head and piston in sae. In standard thats 56.86 hp 36.71 tq! My bike has A stock intake with thair box cut away and no mods, 41mm FCR stck crf carb, Stock valve springs and an HRC cam. There are alot of guys out there doing good quality work and this is what you should see out of a good port job on an 06 up. It doesnt have a big name behind it but I think JC Racing Engines is Just as good as any of the best players in the game putting there best foot forward on every build they touch. This thread is for the guy that wants and deserves to know what his hard earned money should get him with a new piston and port work. I am hesitant to add a bigger cam, Carb and intake. However as time and money allow I am going to add them and take you on my ride to 60 plus hp in SAE (63 + in Standard). I intend to add aftermarket springs, Custom grind web cam, custom intake. 43.5 carb and as many other goodies as it takes to get me to the land of 60+. Thank you for following this thread to all orgers and a huge thanks to Jared Of JC Racing engines for making it happen!

Good info and thanks for sharing. At the end of they day if you are happy with your build thats all that counts.

wow! they are some impressive gains guys,well done and thanks for sharing.
and thank you for making my decision to get a port and polish job easier...
i mean if i get half them results i will be happy.

thanks dave, i didn't realize you had the gragh in STD 57/37 for a 06 with a hrc cam shows alot of people that this cam has the potential to be on top! with the stock valve springs and valves you can be worry free about damage considering this is a oem part.

i think the next step should be the bigger carb once you get used to the new power.

im glad your very happy, now pay me for all this work!!! lol

After I get done paying the dyno guy!! lolol

Congrats Jared and Dave! Nice looking build!

what do you mean by 63 hp in standard? why dont u just stick with one number like everyone else does??? just curious

Well charlie it seems as though each dyno is different and the dynoes that we have been to dyno everything in sae. I was told that if you multiply your sae dyno by 5% that is what your number is in standard. I didnt intend to confuse anyone since my quad was initially dynoed in sae the second and final dyno were in sae, which are the lower corrected numbers. Some shops will only dyno sae when most of the big 60 plus numbers you see on here are in standard. If I intend to continue this thread in its origional format I have to dyno it in sae and use the standard 5% increase to tell you what it is in standard. For example 54.1 sae = 56.80 std, I am only using one set of numbers then multiplying it by the 5% to show what it is in standerd sampling.

thanks!

Thanks Dave, btw found another spacer if you need it! lolol

Great results, thanks for sharing!

Thanks Gary, If this thread helps oneperson it was worth it!

my point of view is that 4hp over a good head is blowing it away.

nice gains guys.
the piston added more to a 06 then i would have thought.
the head gain is great!

sorry i got your topic off track a little.

Thats cool hawk thanks for the props man, now we will see if I can use it. lolol

Got the new axis rear shock today and Im headin for semo this weekend! Gonna take me a couple of weeks to get the cam and the valve springs but I will get it on the dyno as soon as the new custom gring web and the springs are installed. I will then add an esr intake and dyno it again. The last major mod will be the 43.5mm carb, thanks for watchin!!

From SAE To STD is a 2hp change. I have not seen it correct more than a half of hp here on our dyno here in Cali. Good running bike!

I will have him print off a standard graph to see what the increase really is and post it as soon as I get it!

still trying to get that standard graph, promise it will be up soon!

i do have the std graph at home. i am on a long awaited vacation for a week! i will post it when i get back. but from what i have seen it looks to be an average of 2.15% difference. which is defenantlly not 5%

if im remembering correctly it made right at 56/36 but as soon as i get back friday night i will post it up!

You are alive! hope you and the family been having a good vaction.

Somewhere on the site there is a great explanation of the difference between STD and SAE The easiest way that it was explained to me is like this.


STD, or Standard correction factor. The Standard correction factor corrects the dyno numbers to the international scientific standard conditions of 59° F, 29.92" Hg barometric pressure, and 0% humidity. Since cooler air and higher air pressure both result in more air molecules entering the engine, an engine will produce more power under STD conditions than under SAE conditions.


SAE (Society of Automotive Engineers) correction factor. The SAE correction factor tells you what the power output would be if the temperature were 77°F, the barometric pressure 29.23" Hg, and 0% humidity. As such, the SAE correction factor is conservative compared to the STD (Standard) correction factor, and probably more closely reflects the amount of power will be produced under real-world conditions. For this reason, SAE is currently the most widespread correction factor used by auto manufacturers in rating horsepower and torque output. -(from DJ)

Funny thing is if you think about it this is its all just data sampled by the dyno software, it cannot ever actually control the amount of cool dense air ingested by your engine, so its easy to see that it all can get strange on some days and it can never be a set %. IMO you just have to use the same setting for all of your testing, and like Tice said, don't dyno on really humid days because no engine likes that.

I have seen 4-5 % differences somewhere in the dyno section buried.

All of this intended to pass along what I have gleaned over the years, not to take away from anything anyone has done or anything like that. I am human, and you can bet your ass id like my numbers in STD if I can get them.

just thought since i have seen a lot of talk about the correction factor in here that i would add it. Enjoy the motor im sure its fast.

Thanks for that explanation Jeff its dead on.