SLORYDER

AK Heathen: If the engine is not accelerating, how will the time based grap post a horsepower number? The graph shows the engine PUTTING DOWN an average of 42ish horsepower for over 2 seconds. Now, if the engine was not accelerating-that is if it were at 8000 rpm say for 1 second, then the graph would drop off and would show zero hp. What you read on that graph is the amount of hp(acceleration) at any particular moment. Where the graph drops off, then goes up again, is where the acceleration slows, but is still accelerating. Like I said a lack of acceleration would be a vertical line. If it were at 8000 rpm for one second there would be no horsepower shown. If bike (a) puts an average of 30 hp to the ground, from now until 5 seconds from now, and bike ( puts down 40 horsepower in the same time period, bike ( will have covered a lot more ground, gearing being the same; horsepower = acceleration.

But theoredically, when looking at an RPM based dyno graph who's to say it doesn't stay at 1 rpm for a second or two? I believe my assumption about the trinities having 4x the range of the dynoport6s was accurate.

Edit: I see your point. I think your example is very exaggerated, though.

Are you autistic or something guy? Chill bro before you hurt yourself. A couple of things I noticed: 1. The bike with the dynoport pipe appears to be more modded; the Trinity run shows only pipes and filter, as opposed to the former having porting timing carb ect. 2. That's just a weird power curve it appears the engine is not calibrated to the pipes. 3.The trinity pipe provides roughly double the average horsepower than the dynoport pipe. The bike with the trinity pipes would be much much quicker than the dynoport bike. I am actually impressed with the trinity pipe now. Thanks!

Also look at the average hp once both pipes are "on" Very very broad power with good rev out..

I could be wrong but something does not seem right about that trinity pipe dyno run.

Yeah I called Trinity and asked them what port durations worked best with that pipe he basically said it would respond well to any porting. He also said it would produce good power past 10,500 rpm. Kind of vague

I don't believe you have enough research o say they peak at 8,700 rpm. You would have to do several tests using several exhaust durations to find out where the peak rpm is and what the hp number is at that rpm. That was their peak on that particular motor.. On a stocker it would've been over 1,000 rpm sooner.

But your boy schnopski says Trinity pipes suck...

You are wrong. I don't have access to the pipe design parameters like tuned lengh, diffuser and baffle cone angles, so I can't reealy comment on them mote than that. I had the Trinities in a 10mm cheetah but that info is useless because of several fectors. Please share what you have with us. I am always willing to learn...

I think you're dumb as a brick First is pro circuit, second is pt mid http://www.angelfire.com/extreme2/yambanshee/techtips/pipes/procpipes.html http://www.angelfire.com/extreme2/yambanshee/techtips/pipes/ptmidpipes.html

Care to share? And I wouldn't consider the pro circuit a low mid they come on after the stockers in the vicinity of many higher revving pipes (paul turner hi rev , t-5 ect..)They peak a little lower tho

I like jim and all but............ Mid 80's drag ported 4mil on race gas. Definately not power everywhere

I think the two are more similar than you think. As far as a race it depends on who did the porting.

Trinity pipes are nice. All stainless steel construction so you dont have to worry about rust or chrome peeling. Cant comment on the performance mine were on a 10 mill.

Depends on your budget brother. If you can aford it go powervalve cheetah. You will never want another bike after experiencing one. Mine was a 10 mill with only trinity inframes and 35 carbs and it was a joy to ride. No riding the clutch or on/foo powerband which is very tiring. Unless you drag 90+ percent of the time go powervalve motor. If the funds will allow

If you look good you can get a good running one for 1500

Do you guys ger paid by the site sponsors to say stuff like this? It does not take a genius to widen and raise a hole. Like I said, widen it by 1.5mm on each side, raise the exhaust port 2mm and try to keep the shape as close as possible to the original hole. Don't touch the floor; blend the cut through the port to keep the cone angle the same. Make sure there are no sharp edges, chamfer the port when you're done. Cost: maybe 20 bucks for a few rat tail files for 10 plus horsepower. Go to the main repairs page and click on useful links. Download bells book and read. Then port your cylinders if you think you can. A builder can get you more power but if you are even somewhat mechanically inclined and are not on crack you can get some free hp. Why not?

You wont be disappointed unless dragging is your #1 priority

Well mine was a 521 (10 mill) and I really liked it. The main difference is that pv bikes are so much more effortless to ride. Mine was geared for 100mph and I could launch it in 3rd. Going up big dunes was child's play due to the fact that you could go without having to worry about what gear you're in or slipping the clutch and having these sudden jolts of power. That said the non pv version is just as fast and probly more fun in the short term because of the explosive powerband. PV motor pulls hard from almost any rpm with the top end of a cub. I would not hesitate to build another one if my funds were taller. Oh and mine had trinity pipes and 35mm carbs. Would like to have done 39's and cpi pipes

Ha! Found some pics Enjoy

http://www.angelfire.com/extreme2/yambanshee/techtips/pipes/graydonpipes.html

Right on!

Pv cylinders are wawesome for sure. You lose the top end hit and violent powerband but riding is so much less tiring. When I still had my 10mill PV cheetah I was riding at the Seminoe dunes in Wyoming And there are some massive steep and long dunes there..i remember hammering up the tallest one in 5th gear pinned, ready to shift into 6th but i ran out of hill. And the thing was geared for 100mph. A Raptor 700 that was there was struggling in 3rd lol. I could actually launch it hard in 3rd but my swingarm was way too short I think I have some pics of seminoe...