sTaLa

I live in the province of Quebec in Canada and I'm looking for a place that will be able to street port my engine. But this guy contacted me and offered me this motor:

comes from rx7 specialite
0kilo yet
3mm apex seal
streetport
teflon. viton

everything is brand new
comes with all the external gaskets
exemple water pump, manifold etc

I don't have a price yet, but have you ever heard of rx7 specialite? I was looking for rebuilding and streetporting MY engine, but if I have a good price from that guy...

iceblue

IMHO I would stay away from 3mm seals.

B6T

iTrader: (2)

Isn't RX7 Specialities that place in Saskatchewan?

sTaLa

I don't really know where's Rx-7 Specialities, that's what I'm wondering.

And why exactly would you stay away from 3mm apex seals? Are they ALL bad or some of them are made of good quality?

Alak

iTrader: (9)

Rx-7 Specialties is in Calgary. World reknown shop (owner of this forum is good buddies with the owner of that shop).

Alls I can safely say is that I've never had a bad experience there. And Adam backs his motors pretty good.

_Wraith_

*Edit: Alak beat me to it :p

RX-7 Specialties is in Calgary, Alberta. When I bought my '87 GXL, the engine was from them, been working great ever since (about 2 years ago I bought my FC). They are pretty well known here as being a very good Rotary specialty shop.

Also, nothing wrong with 3mm seals, as I understand it (somone correct me if I am wrong) they provide a more robust solution then 2mm seals. Especially in turbo applications.

They were also featured in an RX Tuner issue. Vol. 2 Issue 3. (http://www.rotaryengine.com/rxtunervolume2issue3.htm) Warning!! Very large pics in that link

And also in a Modified Mag (Nov '03) http://www.rotaryengine.com/modmag1103.htm
Warning, also large pictures

Contact info below:

RX-7 Specialties
http://www.rotaryengine.com
Tel (403) 246-6980

Hope that helps

~ Chris

Alak

iTrader: (9)

2mm seals versus 3mm seals is an ongoing discussion. To me, a seal is a seal. To others its only 1 or the other. I wouldn't bring it up, because then there would be a 10 page flame war. Adam swears by 3mm.


But for thought. Ask yourself this. 84-85 13B's were 3mm. All others after 85 were 2mm.

iceblue

All they offer is a small durability to light knocking. If a motor knocks enough or hard enough it will take out 2mm seal and 3mm seals. All rotors past IIRC 87.5 or 85.5 have hardened groves. When you mill this it is near impossible to get the grove perfect and you weaken the corner groves of the rotor. What happens when you get the grove out of whack is you experience apex seal chatter. Basically 3mm seals are a waste of money. Mazda tried it in the early 80s.

The only time 3mm seal should start being considered is when your rotor grove is out of spec and you just can’t get new rotors.

The next down fall to 3mm seals is less sealing on low RPMS creating a lower starting and low RPM compression across the board. Less HP and less TQ down low then 2mm seals, you really can’t beat OEM seals there among the best.

Quote = ReTed:

Waste of time.
Waste of money.

Problems with milling the rotors is that if they are not done perfectly perpendicular, the apex seals tend to seize due to the wrong force exterted on them when in use.

Quote = MaX:

I am afraid I have to disagree that leakage amount even at high rpm does not effect horsepower, Ive seen the difference on a dyno, and as I posted before it, it was a 100 rwhp, that motor cranked out 6's and made 400 rwhp at 1.2 kg cm3, about 18.5 psi, once it cranked 9s with a new motor it made 500 rwhp, same car, same turbo, with less fuel..Testing compression also shows the seal to rotor relationship as well, if that area is not right, there is reduced gas pressure to seal the apex seal to the housing, a good engine is the sum of parts, and subtractions of all the tolerances internally. I also disagree that 3mm makes a stronger motor, adding 3mm seals, makes a motor chatter earlier, and lower the useable rpm of the engine, as soon as the apex seals start to chatter, you start losing seal, and power, Mazda itself concluded that 3mm seals cause the rotor housing wall to distort under power earlier, and that the greater volume under the seal was also a problem in compression numbers and leakage. In the end adding more weight to the rotor tips, creating more chatter, more leakage, and machining the hardened surface out of the rotor tips, and neccesitating more boost to make the same power does not increase the strength of the motor, and under serious power, I have not found 3mm to withstand any more abuse , I have had stock 2mm suffer more abuse than 3mm seals, even though they survived the detonation, other parts didnt, so goes the domino effect...If the apex seals dont fail, something else will.. Nothing makes a mess of a turbine blade like a 3mm seal...
I couldnt find anyone in Japan using 3mm seals in 86 and up motors, and no one recommended it for reasons of practicality , and durabilty. There are guys there building 2mm 850 hp drag motors, even the high boost circuit cars all used stock 2 mm seals...3mm seals have become popular for recycling rotors here , probably more from a cost standpoint than really a performance standpoint, I know the process the original grooves are cut under, and it cant be recreated accuratly enough to ensure the same tolerances as a 2 mm seal in a stock good rotor slot, in regards to seal fitment in a running engine, seal slot location, and wear rate..Max

23Racer

Holey cow!!!! A well thought out response backed by facts and examples. It must be B.S. LOL.

Actually, thank you Max, for taking the time to explain the reasoning and pitfalls of 3 mm vs 2 mm. You confirmed a bunch of theories I had, but didn't have the experience to back up.

Now just need to understand pitfalls/benefit matrix of carbon versus steel apex seals in high rpm applications

Alak

iTrader: (9)

I think for everyday, average performance engines, you wouldn't know the difference Really. If you were trying to squeeze every HP possible, then it would matter, I think.

sTaLa

I received a price from the seller, he's asking 2800$ CAN and he has all the receipts that prove the engine has 0 km and comes from rx-7 speciality.

But it's a bit fast and I must make more researches on the subject. I think I will go with what I planned: change exhaust (full Racing Beat), CAI, brakes, some other stuff like tranny and drive shaft (they're tired) and then I'll rebuild and street port my engine.

one7won

Stala

Is this motor a 13BREW???
If so, can you please forward the name of the seller if you are not interested in buying it. I am looking for a motor for a 93 13BREW TT. Thanks

sTaLa

No, the engine comes from an S4.

Manntis

I bought 4 slotted rotors for an '85 GSL-SE from them. They sold me 3 1st gen rotors, 1 2nd gen rear rotor in a 1st gen labelled box. When I discovered the error I tried to get them to swap me a 1st gen rotor or let me return the rear rotor pair for a refund, but they just kept saying they no longer stock those rotors at all and refused to commit to a refund. I called for weeks and every time the owner was out of the shop or, if I got put through to him, he'd need to 'call me back' - but wouldn't.

Syritis

iTrader: (2)

yes i agree Adam can be incredibly busy, and his customer service isn't the best but his knowledge is extraordinary. He's also part of Major world wide projects and very lengthy R&D experiments. In many cases Adam is just the distributor for many products (RB for example) So the slotted rotor inncident ^^ doesn't surprise me.

one7won - the link is RX7 Specialties


as for the the 2mm/3mm debate i believe the 3mm seal is an affordable seal to handle most applications, but for an unlimited budget project they're are better perfoming 2mm seal with greater strength then the common 3mm. so the better seal depends on the budget.

Alak

iTrader: (9)

Speed = $$$$

How fast do you want to go is what it narrows down too. In most cases.

shifty703

I have a 2 year old RX-7 Specialties engine and so far its been great.

Alak

iTrader: (9)

I think one guy here went about 5 years of ABUSE. ABSOLUTE ABUSE before his motor gave. We're not expecting his new motor to go that long because its a half-bridge. Maybe get 2 or 3 years out of the thing.

got_boost

iTrader: (16)

yeah, well we have at least 5 ppl who's engines DIED within the last few months.... all from RX7 Specialties ....
2 of them blew at the Steve Kan tuning, and 1 barely a month after AND WHILE RUNNING LOW BOOST (13psi).

and one of the engine isnt dead but is smoking BADLY and he tried to put the blame on a turbo. the thing is we tryed with at least 5 different turbo.
so he sent his engine BACK AGAIN, and Adam didnt find anything (like he would admit having made a mistake) so THE CLIENT ended having to pay for 4 trips in total of shipping and for absolutely NOTHING but a smoking engine...
and took him like 6 months to find a certain paintcolor for an engine for a 13B-REW (Blue Pepsi) he said its because the paint came from Australia, but its funny cause ive ordered a complete FMIC kit and it barely took 2 weeks.

sTaLa PM, im in Montreal. ill refer you to a great shop that is located in Ontario, does A1 job and charges less then what ur gonna pay.
oh and whos customer service is probably one of THE BEST beside ppl like Pettit Racing!!!

*i am nice enough not to yell that shops name,since this thread is about rx7 specialties*

eoph

Um, what major world wide projects and length R&D experiments?

Football22

I just dealt with adam recently and he seemed to be okay. As everyone on here is saying, he definatly has TONNES of knowledge when it comes to RX-7's, but I think that he is almost too busy for his own good and jut rushes things too much which probably ruins his crafstsmanship/reputation. I just bought all the parts to rebuild my engine from him and from the parts that he gave me he gave me a 2nd gen clutch instead of a 3rd gen, he gave me a used turbo gasket (He gave me a discount on the gasket, but when I asked him about the parts on the phone he said he had everything in stock so I wasn't expecting to have to use a slightly used gasket but kind of had to since I want to get my car back from Van ASAP), and the injector diffusers for the primary's were damaged. This could have happened during shipping but it's hard to say. I never talked to adam about the diffusers since I couldn't garountee that they came that way, and with the clutch I just had to go back to his shop and get the correct clutch and ship that out to van. Once I get my car back I have to return the other clutch. So he did fix his screw up pretty quick and I can't really say anything bad about him or his customer service. But as I said I just think he is too busy and just rushes things. If you ever spend some time in his shop you will see how busy he is. He's always running around like a mad man.

TD07

I'll keep it civil Mods.

Adam talks a GREAT game, first time customers are usually awe struck by it, once you get into things deeper you find out he's wrong about alot of stuff. He's an AWSOME salesman. I would agree he's probably too busy for his own good and mistakes with parts and engine builds have been the result. But there is more to it than that, mistakes you can't blame on a hectic schedule. I think it's no secret I don't recommend using him for anything, mechanical or engine wise.

Got Boost. It's sad to hear your experiences with Adams motors, we've had similar experiences out here when his motors get placed on a dyno. I'm not an enormous Steve Kan fan but it's hard to blame anything but the motor and who built it when the tuner is as well known. Everything you explained about shipping motors back and forth and Adam always passing the buck when it comes to responsibility? That's all PAR for the course it seems. 5 people with blown RX-7 Specialties motors? That's just not good.

Alak

iTrader: (9)

Its like beating a dead horse's bones. This topic just never goes away!

got_boost

iTrader: (16)

i didnt do business with him. i dont take away is rep, people should go there if they feel like it. i mean, he didnt get where he's at by doing crappy stuff. its normal he might have to rush for some stuff sometimes, hes not a robot and everyone makes mistakes, me first. but personnaly i wouldnt go there. and maybe in the western Canada hes the best i dont know.... but as eastern Canada goes, id tell ppl to go with R.P.M , Joe has done a LOT of amazing work and I personnaly have never heard any bad stories about him or his shop.

as the rx7specialties engines its people in our club (clubRXquebec).
im sorry, its 4 engines not 5.

13b-rew:
1 stock engine
1 mildly moded
1 single turbo

13b-t:
not "blown" but smokes a lot for no apparent reason (tried with 4-5 different turbo, so i highly doubt it somthing related to the turbo).*but Adam is currently re-looking at the engine*

TD07

I see. Thanks for clarifying.

Hopefully Adam and the customer will resolve the smoking engine issue.