My reasoning was with the Renesis side ports and the small added p-ports you could have just as much port area as a big 2 inch p-port without the port timing of a big 2 inch p-port. Wouldn't this increase the power output without sacrificing all the drivability?

 

I'm not saying that it would work. I'm just really curious what would happen if some body did it.

 

i've never seen actual numbers, but from what i understand, the Renesis' exhaust port area is actually larger than the older 13Bs with peripheral exhaust. i know that significant exhaust porting cannot be done on the Renesis without implementing the special "water-injection mod" (not my joke, but i thought it was hilarious ). however, the problem with the Renesis is not moving volume, it seems to be the flow characteristics.

speaking only for myself, if i were interested in putting peripheral intakes on a Renesis engine, i honestly don't think that i'd put peripheral exhausts on it. i'd port the stock exhausts the best i could and probably call it a day.

 

I found the thread with the periperal intake Renesis engine and the dyno numbers showed that it made around 250 horsepower. It's kinda low for a p-port, but they made it at around 7500 RPM's and there intake runners were still kinda long at around 20 inches. I'm curious as to what power this engine could have made had they set it up for more high end power.

 

The question here would be what the defining factor is, exhaust port timing, flow, or both. Also with the peripheral port exhaust, you can use pulse wave tuning for more power which does not seem to work with the Renesis side ports.

 

I would think mostly flow and a little bit of timing. With a peripheral exhaust the gases can just exit straight out, on the Renesis they have to snake around the side ports. I bet you can still use pulse wave tuning on the renesis it just isn't as responsive with the side ports. Shoot, mazda did it with their side port intake.

 

Finally got some work done on the engine. Got it halfway painted, some oil mods done with a turbo oil pump in the mail, increased oil pressure in front and rear oil pressure regulator, flared the end of my oil pick up tube and will smooth the oil pump ports. I'm thinking about making an oil pan baffle as well. I ported the side irons; i kept the port timing prtty much stock but opened up the runners quite a bit. I got the p-ports for both housings cut and the pipes turned donw to a nice tight it but I still need to cut and shape the pipe to the housing.

 

things are looking good there. i like it.

how did you go about making the flare/venturi on the pickup tube? did you weld a washer or did you go about it another way?

 

Thanks, I was beginning to think p-ports weren't cool anymore because nobody was posting in the thread. For the oil pickup tube i did it the redneck way!, a hammer and an anvil. I used a ball peen hammer and the rounded end of the anvil to get the flare and used a dremel to smooth it out. I just cut a circle out of some sheet metal for the screen holder. I don't want to use the stock screen again, I want to find something that will flow a little better maybe some screen from a screen door or something. I got the p-port smoothed out to the housing, here's some pics. How's yours coming?

 

what is the new open time? im betting 75º BTDC give or take. what are you using as a valve to keep it closed @ low rpm?

 

I'm not exactly sure of the opening timing, thats probably a pretty good guess. It closes exactly the same as the aux ports though, 70 ABDC. It will be open all the time for right now, maybe later on once the engine is running I might try to rig up some type of stage throttle bodies. I'm not going to be using the aux ports or the primary ports, just the secondary ports and p-port. I thought that the secondary port would kind of turn into a primary port and the p-port would be the new secondary port.

 

the P-Port will be the first to open and will give lots of overlap, just expect it to run like a PP more so than any thing but let us know how it runs.

 

Yeah, thats kinda what I figured. My thinking is (might be thinking wrong) that if I used a smaller peripheral port opening with a side port it would keep the overlap down but stilll have about the same flow as a peripheral port with a bigger opening. Is this correct?

 

It should flow more than if you where just using the P-Port, It will still have a lot of overlap but not as bad as a J-Port. Best thing you can do is try it and let us know how it works :p

 

yeah, we (the semi-pp guys) seem to be a relatively rare lot. however, keep posting. i can speak for myself in saying that you're guaranteed to have at least one interested reader/cohort.

thanks for sharing about the pickup tube. i never thought about doing it that way. however, i also don't know if i trust my skills enough to not mess it up if i do, so i think i just go with having someone weld a washer to it and then apply my Dremel skills (which i am confident in) .

as for my project (thanks for asking, by the way), things have been a bit slow for the past 2 months or so because of work. i tracked down the Devcon i need to a local store so as soon as i can make the time, i will go and pick some up and install my sleeves. as soon as my sleeves are installed and i get my port faces smoothed out, my rotor housings are done. at this point, i need to find a front housing, port it and do the oil passage mods, then it's just a matter of getting my rotors race clearanced and balanced and i'll be ready to assemble the engine. not to jinx myself, but i hope to have the engine assembled within 6-8 weeks.

 

Ha ha, I hear ya about getting jinxed. When I started this project I thought I would have it in the car and be driving it around by now. I'm actually working on doing some of the oil mods right now and I just got a turbo oil pump in the mail from ebay. Looks like it's in fairly good condition! I'm trying to decide if I should put a screen on the pick up tube, I read one of the oil mod threads and someone said the screen causes aeration in the oil? If you don't mind, how big did you port your exhaust?

 

yeah, no **** about thinking i'd have it running by now. i think i officially started this project sometime in late 2007 (possibly early 2008) and i still don't even have it assembled yet. at first i was trying to find someone local to cut the ports for me, but one thing after another led to me deciding to just take a chance and do it myself. it's been the same thing with the sleeves, so i'll be doing those myself, too. right now, with all that i have going on in life, i have to set small goals at a time. so my main goal now is to get it assembled. my goal after that is to fashion an intake system for it, then after that i'll look for engine management. moving on since this is your thread and not my diary ...

considering some of the crap i've seen stuck to screen when i disassemble some motors, i'm not sure i have the sac to run the pickup tube without the screen. i know BlueTII ran it without, but if memory serves i think it eventually did come back to bite him in the *** (though i think it took quite a long time to do so). i'm proof of Murphy's Law and i accept it as life, so ...

i don't have access to my photos right now, but let's just say i used the RB race template to do my exhausts and they are ******* huge - biggest i've ever seen. so big that i actually am a bit curious to see how they do power-wise. the overlap is incredible. if you read between the lines, i'm saying that i may have made a mistake using them - considering that i'm not running full peripherals - but what's done is done. i've already decided that i'll create my own exhaust template for the next semi-pp engine i build. however, we'll see what happens with this iteration. for now i'm just glad i've made as much progress as i have. there have been times in the last year and change that i thought i'd never even have the ports done.

as soon as i can get back to my computer in Florida, i'll send you a few pics.

 

Looks like this thread is pretty much just you and me so far, so type away my freind I don't care. That really sucks that you don't have time to work on it. Yeah if my uncle hadn't had access to a lathe for the sleeves mine would've probably come out looking like crap, but hey sometimes the one sure way to get it done is to do it yourself! It's kinda fun building it yourself though, because you can say your the one who cut that big hole in the engine! I got the oil pump passages smoothed out. I really would like to run the oil cooler line out of the front iron instead of the front cover, but will I need an external oil pressure regulator? Yeah, The more I think about it I want this engine to last awhile so it would probably be a good idea to run an oil screen and I think I've found what I'm going to use! Here's some pics so far.

 

whoops, here they are

 

some more

 

I think it would be neat to see the center throttlebodies act as secondaries and stay closed at idle, and use the outers for the side plates and utilize the primaries and make the secondary ports functional. Could make for a smoother idle and a wide powerband.

 

oh, most definitely! i've learned so much (both because i self-taught some thing and also because i needed to research so much in order not to screw up on others ) since i started this project. i guess my hangup with trying to find someone else to do stuff for me was simply the lack of self-confidence. though i readily admit that i don't know as much as i would like to, i can say that i know a lot more than i care to let on because i read a lot. this stuff has always interested me. however not having the tools and the experience in metallurgy and REAL metalworking inspires fear in me because i absolutely hate to be wrong or to screw up! don't get me wrong though, i realize that one MUST begin somewhere. i assembled my first rotary 15 years ago and i was just as intimidated then as i am with this semi-pp stuff. the same thing for when i first successfully ported an engine. i still don't consider myself a "master" of porting, but at this point, i can pretty much put an engine together in my sleep. i guess life can be funny that way.

that said, i've amazed myself throughout this whole experience - making templates, cutting ports, degree wheel verification, etc. - all of the things that go along with doing it and doing it right. i feel so good.

 

as for your project, i think we've hit my first real point of constructive criticism ... your oil passages. i don't know if your pics reflect a work-in-progress or your finished product. if you're still working, disregard my statement. if you're done, then i would say try to get them much smoother if you can. if you need help, i'd say try to contact BlueTII - he's really cool to talk to (PM) and is willing to help. anytime i think of oil mods, i think of him - and i've spoken (PM) to him before.

as for the regulator issue. i think you'll be fine shimming the front and using either (a) a modified stock regulator (i.e. use a hammer and compress the spring), (b) an REW regulator, or (c) an RB race regulator. however, having never actually built an semi-pp yet, i'd defer you to someone of greater knowledge and experience than myself - just not sure who that would be right now - Ito, Crispeed, BDC, Kahren, J9FD3S, Carlos Lopez (i think his screen name is 20B-GT1 or something), GtoRx7, etc. - because, with the exception of Ito, i don't know their semi-pp experiences.

if you're going to drill and tap the front cover for even distribution, then all i can say is do not do the tapered fitting. from what i've read you're pretty much guaran-damn-teed to crack the housing. make sure to get the straight fitting.

that's pretty much all i think i can contribute for now.

say, what size TBs are in the photo? are those from a motorcycle? i was thinking of running 48 mm x 4, myself, but it will ultimately depend on what i can get my hands on first. with what i spent on the 50s for my street car, i don't think my pockets can support brand new dual 48s. .

 

Here's a great how to for oil pressure shim.
http://www.aaroncake.net/rx-7/shimoil.htm

 

I think why the Renesis engine appeals to people looking for the holy grail of NA performance is the high compression rotors. Regardless of PP or not. This is a very interesting thread. Using the PP ports closed untill 1/2 throttle or so. I have thought about this for a long time also.