RX-7 Engine

[Dorikin]

Yes, ive seen one in real life.

[Chris V]

Originally posted by 20bgod
Have you not heard of the triple rotor 20b.
It is able to be fitted to RX7 RX3 etc.
UP TO 1000HP IN RACE TRIM.
i HAVE SEEN ONE PULLING 9OOHP ON 24PSI BOOST

A triple rotor 20b is heavier than a pushrod V8, and longer. it sits farther forward in teh engine compartment than teh 13B OR a V8 would, making the car far more nose heavy. It's over 400 lbs in turbo form, and it sits ahead of the front axle. It's VERY expensive in the US, yet you dont' get a lot for that money. OF the handful of people who have done that conversion to RX7s in the US, the cheapest was $15k. And that was a stock 280 hp version. A guy I know here at work has a 400hp one in an FC and cost him over $30k to do.

A 20B does the one thing to the car that a V8 conversion doesn't: messes up the balance of the car. And it's still unuseable on the street over 500 hp...

[illest7]

Originally posted by Chris V


A triple rotor 20b is heavier than a pushrod V8, and longer. it sits farther forward in teh engine compartment than teh 13B OR a V8 would, making the car far more nose heavy. It's over 400 lbs in turbo form, and it sits ahead of the front axle. It's VERY expensive in the US, yet you dont' get a lot for that money. OF the handful of people who have done that conversion to RX7s in the US, the cheapest was $15k. And that was a stock 280 hp version. A guy I know here at work has a 400hp one in an FC and cost him over $30k to do.

A 20B does the one thing to the car that a V8 conversion doesn't: messes up the balance of the car. And it's still unuseable on the street over 500 hp...

I'd much rather have an LS1

[Dorikin]

GImme a JC Cosmos, and a FC transmission

[Chris V]

I wish I could get a decent JC Cosmo here! Absolutely one of my favorite coupes on the planet. 20B turbo in a beatuful body. Yummm!

[paklifeis187]

can i swap a rx-7 motor into my mazda b2200?

[Dorikin]

Originally posted by Chris V
I wish I could get a decent JC Cosmo here! Absolutely one of my favorite coupes on the planet. 20B turbo in a beatuful body. Yummm!

A friend of mine in baltimore almost bought one for sale in Florida.

[DoriftoSX]

is there anywhere that sells the Renesis engine besides mazda sealers..and a Renesis would be nice in a FC3S...i would take one over a 240sx

[gawdamu2.0]

Originally posted by Dorikin


Im not here to flame you...

Ive heard the RENISIS suffers from S200 syndrome, where the torque is above 6k rpm, id give up a bit of lag to have low end torque

Ive also heard the RENESIS is diffucult to turbo because the exhaust manifold is a weird design and bends around the frame...dont quote me, I think it was in SCC...

doesnt swin scroll mean a single turbo with some fancy trick to it, like the STi and new Legacy, whereas an FD would have a sequential turbo?

Correct. A twin scroll turbo means a single turbo with two exhaust intake scroll passages. I confuse myself sometimes. The FD has the two turbos that spin at different RPM's(sequential). My bad.

[jhillyer]

I do think the Renesis needs more trial, more road time, especially if modifying. But, it's mostly proven, and new exhaust porting is superior except for extra heating of the block.

A journalist [not coolant/lube journals, but literature ] stated the exhaust is cooler this way, but I don't want it, I want it hot and direct for a turbo. The side-housing exhaust is helping hold the bang longer and seep an exit slower than the earlier peripheral-port exhaust. Both the intake and exhaust ports of the renesis ask for mild port rounding and a higher rpm limit, so expect >300 hp NA at high RPM, but we're talking about peak horsepower on a >8krpm engine, and power is a product of ignition frequency. Double the rpm, and get a theoretical 600 hp.

I think the renesis's exhaust porting to the side of the rotor, having it snake through more metal before a manifold, is great for non-boost, but a mistake for pumping a turbo. This is a great engine to keep non-turbo.

I'm not going to talk about a super-boosted 20b that pings/detonates at 105 octane with water fogger, with drastic low-rpm ignition retard, with a 1500 ft-lb clutch, at 105 octane, that trashes composite axles and differentials/transaxles for breakfast. Oops -- just did.
Without engine bay modification for a 20b, variants of the 13B are satisfying. But this is funny looking squirrel: http://media.car-videos.com/videos/m..._RX-3_20B.mpeg

I'm a happy TII owner. I use a separate Audi boinger for daily grind.

The RX-8 chassis greatly out-classes in rigidity. The body aesthetics and the novelty rear doors don't encourage me. If the RX-8 were maybe the price of a used FD series, hmmmm....

Yet, lately I've have Porsche turbo on the mind.

"best" is relative to application.

[911S_TARGA_RSR]

Yay. its another Twin Turbo. I think everybody should just buy PORSCHES.

[jhillyer]

Originally Posted by DoriftoSX

is there anywhere that sells the Renesis engine besides mazda sealers..and a Renesis would be nice in a FC3S...i would take one over a 240sx

Twin scroll in designs I've seen, are only a secondary set of impeller blades, each a companion with primaries, without congesting the intake with multiple leading edges of blades; it steps the secondary set below the primary, keeping a good open cross-section.

This helps grab new air, trap, and maintain boost compression at the spool-wheel perimeter. An example of weakening the principle -- reduce the quantity of impeller blades, say to 2, and do not increase spool rpm, do not increase blade pitch, and do not lengthen the blade path, do not increase spool diameter, the result is lower boost. However, at that lower boost, e.g., few ounces, the spool efficiency is high from lower impeller drag.

[edited, I babbled even more]
Blades congest the intake. The secondary blades fill-in the wide gaps between the trailing primary blades. Whatever is chosen, it's used to help scoup and hold the compressed air (a fluid).

[jhillyer]

Originally Posted by Chris V

A triple rotor 20b is heavier than a pushrod V8, and longer. it sits farther forward in teh engine compartment than teh 13B OR a V8 would, making the car far more nose heavy. It's over 400 lbs in turbo form, and it sits ahead of the front axle. It's VERY expensive in the US, yet you dont' get a lot for that money. OF the handful of people who have done that conversion to RX7s in the US, the cheapest was $15k. And that was a stock 280 hp version. A guy I know here at work has a 400hp one in an FC and cost him over $30k to do.

A 20B does the one thing to the car that a V8 conversion doesn't: messes up the balance of the car. And it's still unuseable on the street over 500 hp...

[not an argue/refute/rebut, and yeah this diverges from the original poster; I commented elsewhere about the Renesis...]

Enthusiast conversions.
A small v8 350 has been done for similar cost. The 350 has cheaper and highly available parts in the west.

I'm amazed sweaty guys in t-shirts, hitting the bong ever 5 in Puerto Rico get a 20b to run 9 seconds for under US$1500.

I would not expect a rebuilt 350 to match a rebuilt 20b in a rigorous cross-country endurance race.

The Edelbrock Performer EGR 8.5:1 provides a nice 310hp and 375ft/lb, as a long block with ignition, but nothing else. Cost of engine: US$4,970 I've read a new 20b is a rare commodity and has a disgustingly inflated price of US$20k. The do-it-yourself method is getting the longer 20b crank and stacking another rotor.

So, the 350 gives great performance, but not the same dynamics as the rotary. The highly tuned version of this Edel' 350, ~US$9,000, is ~425hp, and nearly at its absolute ceiling for power and torque for it's internals. Rolloff of torque and flattened power are at 5000 rpm.

This is package almost as throttle responsive as the 20b. Go 6 months or 100 hours in this 350 without precision valve tuning (not in my budget, and multiple re-visits), and you're cranking drops <400hp.

I think the 20b conversion is for the guys that have their investment manager's phone number in redial. But, I wanted to do it last year. I drive an Audi boinger and Mazda turbo wobbler. I can budget about $5k a year on car parts without thinking I'll live my geezer years in unhealthy poverty and isolation, but the 20b is far from a sensible conversion for the street, for me.

The Renesis mounted into an earlier generation would be a nice trick, and for boost: a simple centrifugal supercharger to avoid effort of building in a turbo, when cost matters.
---edit---
Oh, fine kit:
http://cgi.ebay.com/ebaymotors/ws/eB...tem=2441694621

--edit 7/9--
Courtesy AtkinsRotary.com, single turbo 20b performance, nice thrust by 3.5krpm: http://www.atkinsrotary.com/3rotorinfo.htm

[DayDreaM BelieveR]

http://www.daltonautomotive.com/html/pricelist.htm

Need I say more? possibly... for those of you lazy people out there they're selling 20B's for $4995 AUD

*knows where he's shopping*

[MyGTR34]

Even Nitrous Express didnt want to go with the cosmos engine. They had bought one, but, due to the hard work and amount of money it would take to get the frickin thing street legal and driveable period, it would have been too much trouble.Personally i would love to do the whole conversion thing, but i think id agree with the multi-million dollar company and just make the FD3 a bad a$$ ride with a massive turbo and all the other goodies. But thats just me dealin with what lil money i got, but believe me, if i had the money, Id do it.