4stroker Posted October 17, 2007 Report Posted October 17, 2007 i just threw a degree wheel on my rz motor and measured some port timings it seems that the exhaust duration is 210 degrees, the front transfers (exhaust end) are 130 degrees, and the rear transfers (intake end) are 120 degrees what pipes should i get i want a pipe to take advantage of this big port timing but i also want as broad a powerband as possible (hence why i am using the ypvs cylinders) keep in mind i have the zeeltronic programmable PV controller and can tell my PVs to open and close whenever and however i want! thanks, mark Quote
RZBansheeMan Posted October 17, 2007 Report Posted October 17, 2007 Hey Mark, I am kinda guessing that with those numbers, a custom set of Shearers would probably compliment those very well, but I am not sure if the Shearers will clear the PV assembly or not. I would definately give them a call also. How well do you like your Zeeltronic, I plan on getting one for mine once I've got mine together and running. The high school that I attended, has a dyno jet in the small engine class, the instructor there told me when I get this thing done that I can take it there and dyno it. I will make several runs with it trying out different ignition maps and then will try different PV settings also. Mike Quote
4stroker Posted October 17, 2007 Author Report Posted October 17, 2007 hey man havent had a chance to play around with it yet coz ive got the motor torn down after i thought i had nipped it up i whipped the engine out of the frame and got the head off and turns out everything is a ok (still gonna have the machine shop guy take a look at the bore) anyways im putting the standard top end back on it for now to go flat track racing, as i want a fairly standard and reliable bike for starting out on. in the mean time im gonna decide on what pipes to get for the RZ top end, and also build a complete new wiring harness from scratch with all the zeeltronic components. i figure by the time i get it all runnin ill be ready for more power at the track! i was thinking of ordering a set of shearer small bore pipes but im not sure if ill like em, im thinkin Paul turner high revs would be a better all round pipe, but im guessin there not really designed for these high exhaust durations either... or are they... Quote
RZBansheeMan Posted October 17, 2007 Report Posted October 17, 2007 Those sound like some hot dune / drag durations to me, although I could be wrong. I personally haven't ever seen any PT high revs on the dunes or the drag strip. Mostly just Toomey's, Shearer's, CPI's, Rocket's on the dunes and play dragging and then drag pipes for the more serious draggers. I do realize that your using this for a race engine, but I think those PT's might not let that motor run to it's potential though. I think Jim (PassionRE) would be the person to ask though, he is porting my RZ and has a lot of knowledge on the RZ engines. As for the wiring harness, I sold the RZ harness, keeping all the needed components ofcourse, but I will use the wiring diagrams I have to build my own harness. I will also be buying all new wire for this, so that I know what I have. Mike Quote
gipperz Posted October 17, 2007 Report Posted October 17, 2007 You may have a hard time finding a pipe to clear the p.v. I've heard the rocket pipes will clear and produce pretty good results. Custom pipes may be the way to go but will be pricey. Quote
ellison445 Posted October 17, 2007 Report Posted October 17, 2007 I would go with a set of rocket pipes :cool: Quote
sredish Posted October 17, 2007 Report Posted October 17, 2007 Your right on with the PT Hi Revs, they are a very killer set of pipes, not drag pipe but good top end pipes. Smooth and strong up top but still maintain a good midrange and with the Powervalves, that should make them a killer all-around mid to top pipe. not really too sure how they work on the higher durations like that but not too many peeps have experience with them as they're a little pricey and a lot end up turning towards another direction. Quote
dajogejr Posted October 17, 2007 Report Posted October 17, 2007 Matt Shearer will build you a set that will work awesome ...give him a call. http://www.shearerpipes.com/ Quote
4stroker Posted October 18, 2007 Author Report Posted October 18, 2007 clearing the PVs are not a problem i have a found a way to get all types of pipes to fit not sure why everyone doesnt do it! Quote
PassionRE Posted October 18, 2007 Report Posted October 18, 2007 Mark, your exhaust ports are set for peak efficiency of 12325 RPM....a little high in the banshee world, although the PV will help some. If your trying to match exhaust ports for peak HP you will need a tuned length of approx 875mm depending on your compression ratio. Closest bet will be a shearer...but it will need to be modded to clear the jugs...good luck....Jim Quote
4stroker Posted October 18, 2007 Author Report Posted October 18, 2007 thanx for the input jim that is a little high isnt it! the highest i got it to rev with Toomey T5s on it was 10,200 rpm. that was with 185psi compression. (16/42 gearing) like i said i want to buy shearers but im worried about having less bottom and mid than i do now... i like the idea of the PT high revs having more hit down low and mid than the toomeys but im worried about them not working real well at high revs when my exhaust duration is going to be 210 degrees! Jim do you think the PT high revs will be better suited than the toomeys im currently running? thanx, mark. P.S i have machined the housing of the PV pully a little and made a custom plate that is alot thinner than the standard yamaha one and the toomeys fit fine so everything else should too.. Quote
4stroker Posted October 18, 2007 Author Report Posted October 18, 2007 it seems i am a retard and read all the durations wrong the first time around... i used a dial indicator to find TDC tonight and re-measured everything... ex duration : 202 degrees fr trans: 126 degrees rear trans: 116 degrees so they are a little less radical than i first thought! i think im gonna go with the PT high revs... sredish do you think ill get more top end out of them than the toomeys or about the same Quote
sredish Posted October 19, 2007 Report Posted October 19, 2007 man, i don't have any experience with PVs but on my own banshee, I felt the Hi Revs had a very similar top end as the Toomeys but a much smoother stronger midrange. Granted, setup has a lot to do with it and I was running a 2-1 carb, so I'm not sure how the two would compare with two big carbs. With PVs, the Toomeys could have a smoother midrange, not sure. Quote
wesw Posted October 21, 2007 Report Posted October 21, 2007 it seems i am a retard and read all the durations wrong the first time around... i used a dial indicator to find TDC tonight and re-measured everything... ex duration : 202 degrees fr trans: 126 degrees rear trans: 116 degrees so they are a little less radical than i first thought! i think im gonna go with the PT high revs... sredish do you think ill get more top end out of them than the toomeys or about the same if the shearers will clear the pv, i think you would really like the shearers with that exh they will really pull hard. Quote
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