more engine development dyno graphs...

[Wayward Son]

ah yes,more graphs. ? after talking to RHC we decided to see what one of his cams would do in a stock motor at high altitude.

so i purchased one of RHC's new protype "torque" cams.

here you go.ron can fill any one on the details of the cam.

RHC cam vs stock cam horsepower

RHC cam vs stock cam torque

heres the overall gain from stock pipe and cam RHC cam and CHM SM1 pipe.

horsepower

torque

next step is 13.5 to 1 compression with the cylinder to head clearance closed up some.that should bring the horse power up and bring the peak torque along with spreading the curve.

shortly there after ron should have my head done. ?

right now in very pleased with being above 50hp for 2500 rpm and 6hp gain from 8600 to 10,200. ?

[455]

Burned thanks for sharing this info, but better name that cam something else besides torque cam. At least to me, that usually means bottom end power.

[Wayward Son]

thats only in comparison to the normal 208 cam.

im at 5200ft so the stock compression piston isnt optimum for this cam.

this isnt a trail bike. ?

[Ron Hamp]

This cam was intended for the engines that required more low end and midrange vs the 208 grind .in a modifyed engine it produces 3-4 more pounds of torque than the 208 in the 4000 to 6000 rpm range with only .8 less hp @ peak .also this cam has less intake lift than a stock cam and the same ex lift as stock it will be eazyer on the valve train .With increased compression it will make more low end and more peak with much better over rev also with the increased ex duration the engine should run cooler if it picks up 1.5 -2 more hp with the piston change this would be a 54 hp bike with a cam piston and pipe change with more low end and considerably more over rev, bolt on hp .somthing else to consider MCGrath got 3 rd place @ the x games with a 208 grind cam and a 12.5 -1 piston and thays all no porting .

[MRD RACING]

Ron can you tell me the lobe centers you are running ? and what the the centers on a hot cam stage 2 are , just wondering . thanks

[Ron Hamp]

the cam Lc is suposed to be 107 in 104 ex the stock motor liked the timing advanced .i have no idea what the hot cam is for timing

[MRD RACING]

Ron thanks for the info, looks like burned got a nice gain with your proto.type

[Wayward Son]

im running it at 103/108.

[MRD RACING]

Burned thanks for the spec's , and for sharing your data

[Shawn_Mc]

Has anyone tried retarding the cam 4 degrees? I know you'll loose some on the bottom, but it normally creates a beast on the top...

[Ron Hamp]

retarding the stock cam helps the top end but in the case of this cam it did not change the top end @ all advancing it helped the bottom but did not change the top

[Wayward Son]

heres the difference between 104 and 108 on the ex lobe center.

red is 108.

HP

TQ

[Shawn_Mc]

Wow...that almost makes me think the lobe centers are pretty tight...

What is the lobe separation at? Im going to guess about 108

[MRD RACING]

Burned the spec I was asking for is the actual lobe separation ground in to the cam , the info you are giving is going to save anybody installing a cam lots of time , thanks for that . but Im trying to compare cam lobe centers because I think RHC'S cam's are scavenging better than others .

[Wayward Son]

thats a question for ron.

since it was a prototype there was no cam card included.

ron instructed me to set it up at 107/104.after confering we decided to try 103/108 becuase of my altitude and only using the stock piston.

[MRD RACING]

I will check with Ron, thanks again , not too many guy's share thier development spec's like you ?

[Ron Hamp]

lobe seperation angle 105.5 107+104=211 211x5=105.5 103+108=211 211x.5=105.5 seperation angle ,i have been thinking about changing the sep angle but the cam seems to work well now.Ron

[MRD RACING]

thanks Ron , yea if it aint broke dont fix it

[chrome-crf]

Looks good Eddie. It's starting to come together very well ?