RX-Heven

iTrader: (1)

The a/f is squeezed into the bathtub area because it has nowhere else to go. Now with those scallops, there seems to be another place for the a/f to get squeezed into, that is why I was asking. I tend to agree with fdracer but that is just an ssumption on his/my part. Also by increasing the bsfc, the increased port timing the 'scallops' allow for seems to be wasted. I could be very wrong though.

I would be very interested to have Carlos chime in and explain the effects in some detail with evidence to support the idea.

I see a biggest advantage in the weight being taken out of the rotors, especially so far from the center of mass. You should be able to rev the hell out of that engine.

Either way, I think it is absoluteley great to see some new r&d with our little engines.

rx7tt95

The idle isn't affected by the rotor port phasing (scallops) at all. The port size has more to do with idle quality (velocity/fuel atomization) than does the port phasing on the rotors. I've been able to get it to idle smoothly, like stock, at 950rpm. Carlos feels that's too low and to set it at 1100. I'll be working on that tomorrow! The engine seems to like the high 12's for an a/f ratio at idle...compared to my last motor which liked the the a/f somewhere in the mid 11's. I'd say that's mostly due to the healty compression of the CLR-built motor.

Heven, if you read through the initial post, you'll see mention of negative split. Instead of all the a/f mixture being pushed by the apex seal, the negative split pushes the mixture to the other end where it finds the bathtub. Also think about where the pressure is lowest. The bathtub. The a/f mixture is going to naturally seek out the lowest pressure area. The rotors have been proven in competition for about a decade. Many road race teams have used such rotors, even the RX8 rotors have port phasing! One does need more fuel with lower compression rotors. But almost all of the BSFC drop is due to the rotor itself, not the addition of the port phasing. When the big C gets back into town, I'll try and get him to elaborate.

dubulup

I've riden/driven an FD with an Engman built motor...and I'm actually aiding in the initial tuning as well...(we're up to 10psi with a 35R turbo...this thing is scary!!) Rick actually has done some work for the motor I built (lapping, balancing, polishing, pressing, etc) it is VERY aparent my motor is not in the same ballpark, not that I know anything about rotary engines.

The Engman motor sounds quite similar to yours...oil and cooling mods/tricks. This motor makes almost 60psi of oil pressure at idle and above 2.5k rpm the stock oil pressure gauge is slammed and runs cool even when beaten on.


I'm really curious about your negative split/double throttle mod. Anyone know if the Haltech E6X can run negative split? the trailing map I see doesn't look like it allows it.

Sounds like you will really enjoy this setup...I've said it before but, your car is one of my favorite, how bout some more pics??? Engine bay also...

rx7tt95

You'd think being a professional photographer I'd have more quality images of my car. I never have time! Always shooting someone else's car it seems.

If the Haltech has a seperate leading/trailing map, I don't see why it wouldn't let you run negative split.

Oil pressure is way up there. The bearing mods increase oil pressure in the bearing area exponentially. I can't remember how he explained it but oil pressure in the critical areas is extremely high which helps "support" those parts on a film of oil.

scathcart

So it doesn't brap like a bridgeport? Sound like a normal streetport then?

(Clarification: I don't mind the sound of bridgeports, but my girlfriend thinks they sound stupid for a street car. I am building her engine for her, and am looking for a way to get bridgeport-level opening timing without the sound.)

dubulup

you might be able to get around the sound with the ISC...

rx7tt95

LOL, "when" the ISC is set correctly and it's doing what it's supposed to do, it'll idle just like a stock car. I've been having major issues with my ISC and I'm about to disconnect it yet again and rely on the old fashioned method of setting idle. When the idle is a bit rich, it'll do the brap, brap, brap, well muffled through a Borla XR1 and GReddy Power Extreme. But when the idle mixture is spot on, sounds just like a street ported or stock engine.
Michel

Cybursus

Hey rx7tt95,

I realy like to know the adress off CLR Racing (Miami)
ore if the have a website. I am planning (and saving)
to build a streetracer Mazda RX 7 (type III) with a 4
rotar engine like the R26B (and then turbocharge it )
sow I am gonna need some help from someone like
Carlos.

Greets Paul.

rx7tt95

Let's see if I can remember this off the top of my head...I "think" it's 14057 SW 140th St., Miami, FL 33186. That really is off the top of my head but I'm about 85% sure it's correct.

rx7tt95

Let's see if I can remember this off the top of my head...I "think" it's 14057 SW 140th St., Miami, FL 33186. That really is off the top of my head but I'm about 85% sure it's correct.

A bit more about the engine noise, once underway, it has a bit more of a growl to it, seems to rip a bit more than the old engine. But it idles like stock.

Cybursus

Hey thnx dude
(do they have a website?)

rx7tt95

The web site is apparently not up yet. I know they have a page someplace with a bunch of images on the photobucket web site. I do not have that link handy but I know someone posted the link on this forum so I would do a search for it. They are working on a website. Just not done with it yet! I hear it will be worth seeing with lots of new stuff most have never seen.
Michel

Cybursus

Thank again,
Paul

JBurer

Michel,
That's one beautiful rotor!

I bought one of CLR's customer cars back in 2000. The quality of the work was superb.

Carlos Gonzalez, one of the few other builder's in Lopez's league, showed me a set of cut rotors from his car a few years ago. He wouldn't let me take a picture of them, though
Best,
John
PS Look forward to reading about your progress!

dubulup

any write ups on the dubulup thottle plate mod...yet

I'm taking my car down for mods soon...and I'm very interested in this!!



btw - the haltech map for split timing bottoms out at zero (unless there is another trick I'm not aware of), would this mod be worth while if all I could run is a zero split in vacuum?? TIA.

dubulup

another thing that popped in my head one night late...

secondary ports are larger and the runner are closed in vacuum up to 3psi or so...once you get into boost would some of this air/fuel get blown thru into the secondary port since two ports are open and only one is suppling air? Or is this action entire too fast for this to even matter?

rx7tt95

Haven't hooked up the double throttle yet....still working on a leaking oil pan. Since I have the Cosmo block, the FD oil pan doesn't like to seal very well...Carlos went all out on it but it's leaking. Just received my Xcessive Motorsports pan which should solve the situation. I took the motor mount holes out from 14mm to 9/16th, and installed freeze plugs in them. That way no welding of the holes thus no distortion. I welded the holes shut on the original FD pan and I'm pretty sure that's why it won't seal. AND...had tranny issues last night. Won't go into gear with the car running. Carlos diagnosed it as the pressure plate snap ring coming out or breaking over the phone! Regardless, I have a spare throwout bearing and pilot bearing ready to go. Oh, I did hook the double throttle up to the manifold with nothing inline. This keeps them closed during low rpm high vacuum situations and they open up (but not snap open) as less vacuum is applied. It actually helps throttle response.

As for the fuel in the secondaries, the transition point they come on can be modified in the PFC. But...it happens so quickly, the fuel is "blown" away and it's not an issue, so says Carlos.

rx7tt95

Ooooh...almost forgot! Carlos sent me a BIG (really big) explanation for the rotors, compression ratio, etc....I need to digest it and spew it back out here on the forum. He keeps on reminding me to read it slowly! He's off to Atlanta or wherever to help with the prototype 3-rotor that's racing. Anyway, need to finish my taxes (ever try to figure out taxes for an S Corp by yourself????), fix the car, be a husband, etc....It's one of those weeks.

dubulup

Sounds like you are working out all the kinks on all highly modded projects!

I take it you just have the DT actuator on a UIM source (vac/boost)?

let me rephase what I was asking...even though Carlos, has already stated it's no big deal...What I was trying to figure out is:

since the primary ports are smaller the secondary ports will be open the entire time the primaries are forcing this "high velocity" air in...to air is forced in only on one side of the rotor, could air be exiting the chamber thru the secondary ports before they shut?


I'll be at the race this weekend also...

SPOautos

Me and Phillip (Herblenny) will be there Sunday to cover the event for RXTuner mag. We should all meet up sometime!!!

Stephen

rx7tt95

Ahh...ok, I understand what you're saying now....hrm...I dunno! It would make sense at first glance although the rotation of the rotor and any scavenging by the exhaust side (I know, very little!) may prevent that...worth asking though!

Try looking for Carlos while you're there...he's going to shoot me for saying this but he's short, balding and older, not wrinkles old but middle aged :-) He's going to kick me in the b*lls for that

dubulup

The rotary car that was racing sounded sweet! At idle, had the brap of a bridge, at speed...butter!

just a note on the Engman built motor I mentioned earlier...its now up to 19psi, and all I can say is WOW!! This engine doesn't seem stressed or near it's full potential. I really want to drop some serious dough and have a engine in a crate waiting for me...

I can't wait to hear some results of your motor with that turbo!!!

weaklink

good luck, I can't find a spare motor to have rebuilt.

rotarygod

iTrader: (1)

It's a peripheral port engine (not a side port Renesis). It should have the characteristic idle of one. That car sounded beautiful at full throttle.

cewrx7r1

iTrader: (2)

I am still waiting on the IGL/IGT negative split map so I can log some runs with the conventional way and the negative split way.

And what about the boost control secondary butterflys?
I had though of that a few years ago but at the time could not find any low cost parts to make one.