Nu2thgame

Ok first of all I have a 88 rx7.

I've been searching for info for about an hour. I have a couple of questions. Awhile ago I was reading that the 10a all the way to the 20b have the same internal dimensions(http://www.rotaryengineillustrated.com/guide.html). Does this mean I can get parts off a TurboII(20b) to put on my 13B and hold close or the same amout of boost of the TurboII.

The reason I ask is cause I have a junkyard nearby that has a rolled 2gen rx7 Turbo II hiding in the back. If this is so then those turbo parts are mine.


WES

Evil Aviator

Welcome!

First of all, if you are trying to convert your non-turbo engine into a turbocharged engine, you need to understand that this is a very complicated procedure, and you would be better off selling your car and buying a turbocharged RX-7. If your car already has a turbocharged engine, then nearly every part from an 87-88 turbocharged engine will fit, and some parts from an 89-92 turbocharged engine will fit. Which parts do you need?

Here are some abbreviations which will help you on this forum, which you may or may not be familiar with:
NT: Non-Turbo
NA: Normally Aspirated aka Naturally Aspirated (which means non-turbo)
TII: Turbo II (turbocharged RX-7 87-92)
Series 4 RX-7: 86-88
Series 5 RX-7: 89-92

Also, here are some clarifications:

The internals are basically same between the 10A through 20B, but if you read that link again, you will see that not all of the rotors are the same size. There are also other differences which will not allow certain swapping between engines.

The Cosmo 20B engine is a twin-turbo 3-rotor engine, while the Turbo II 13BT is a single-turbo 2-rotor engine.

Although the 13B and 20B rotors may have the same physical dimensions, various engine models had rotors with different compression ratios. The compression ratio will affect your engine's performance just like a piston engine, and you cannot use rotors of different compression ratios in the same engine.

Here are two good sites where you can learn more about your car:
http://www.mazdatrix.com/
http://k2rd.freeservers.com/FC3S/MODS/mods.html

Nu2thgame

No I'm not trying to turbo. If I were it would be way down the road. I just wanted the question answered.

Oh well. On to reading I go.



Thanks.


WES

FJ

Welcome to the Forum.
I thought Evil Aviator answered your question, as it reads, rather well. If you don't think so, ask something more specific.

-John.

Evil Aviator

Well, I don't understand this statement because a non-turbo engine runs off a vacuum, and has no boost. If you are trying to get boost, you will need to add a turbocharger or supercharger to your engine.

The thing is, there are hundreds of parts on each of those engines, and some may be swapped, while others may not. You need to be more specific if you want answers. If you are not sure what parts you need, then just post what you are trying to accomplish and I'm sure that many people on this forum can give you some ideas on different options for building your engine.

BTW, if you specify the year and type (SE, GXL, GTU, or Convertible) of RX-7 you have in your Profile and/or signature it will help people answer your questions.

Gamezilla

What did the 4 types come with? (ie. auto, manuel, leather, etc.)

Nu2thgame

What i'm trying to say is can this engine(13b) hold the a good amount of boost without having to be built up. If it could then it would just be a matter of switching the TurboII parts instead of the whole engine. You see what i'm sayin? I just read the article wrong I think. I belive the car is a 86GXL. I'm not sure only seen it once, only drove it once but I didn't even ask what year. I just knew it was a 2gen.

By the way could someone tell me what the differences are among all the letters so I won't have to do a search.
1.SE
2.GXL
3.GTU
4.Convertible. Well I know what the convertible is.


WES

Evil Aviator

The part that I don't understand is that you keep talking about boost, but you say that you don't want to turbocharge the car. You can't have boost without a turbocharger. It's almost like asking if you can put a convertible top on your car, but you don't want a convertible.

If you go to this link you will find some scanned brochures which list the options for some of the different models. Each year had different options, but this will give you the main idea.
http://briefcase.yahoo.com/mcgumrapper

Nu2thgame

Ohh that's what you meant. When I said I don't wanna turbo the car I meant at the moment. Maybe in the future but not now. I just don't know enough about the car yet so I was just asking for a YES or NO answer. I know you need a turbo or supercharger to have boost.

My bad.

Evil Aviator

Hehehe, OK, then the easy answer is no, none of those TII engine parts will make your non-turbo engine any better. In fact, some of those TII engine parts would make your non-turbo car even slower.

Nu2thgame

Ok cool. Now I know.


WES