fitzwarryne

There is often mentionon the Forum to the 13BT. Is this an official designation by Mazda? I noticed the reference in the advertisements was 13B Turbo and TII but it was never clear whether this was the engine or car. Does the engine have a 13B or 13BT stamp and engine number? What was stamped on the vin plate?

iceblue

all rotarys have an engin code and stamp of ither 10, 12, 13, 20, 26
the revishions are 10A, 12A, 13B, 20B, 26B. If they have a T they are turbod and if they have a TT they are twin turbo. Theyre is no ofichal TT teh designated engin code is 13BREW for FD RX-7's and 13BRE for cosmos twin turbos. Try reading the FAQ

soundwavetsunami

You should probably have read the complete sticky for this.

13B = Normally aspirated/ Non turbo, 2 rotor, rotary engine.
13BT = Turbo charged, 2 rotor, rotary engine
13B-RE = J-spec Cosmo twin turbo, 2 rotor, rotary engine.
13B-REW = FD twin turbo, 2 rotor, rotary engine.
20B = J-spec Cosmo three rotor, rotary engine.

^^^ direct quote from the stickie (which can be found here)

SirCygnus

iTrader: (1)

lol. yall dont understand what he was asking do yall? hes asking wather if they actually stamped more than mazda 13b on the rotor housings. he was also asking somthing else about car specifications.

NZConvertible

Mazda does not refer to the engine in the TII as a "13BT". You won't find that in any official literature nor is it cast in to the rotor housings or stamped on the VIN plate. You'll only see Mazda refer to it as a 13B. 13BT is just an unofficial abbreviation adopted by enthusiasts to differentiate Turbo and NA motors.

fitzwarryne

NZ Convertible- Thanks for the response to the actual question I asked.

Like you I prefer a convertible, in my case a 1985 Gen 1. The engine is the 12A efi turbo version which just has the standard 12A casting designation. The number is stamped on under the alternator. This number bears no resemblance to the 1985 carby 12A I have, so Mazda must have had a different engine number sequence for the carb and efi engines in the 12A. I do not know whether this also applied to the 13B carby. 13B efi-NA, turbo and multi turbo, engines

The body numbers appear to run in sequence regardless of engine type. However I believe a symbol was used on the manufacturer's plate to indicate a turbo engine had been originally installed. In your case as an original Japanese model it should have it. Its one of the best indications the car is genuine. Engines from the Cosmo/Luce and a bonnet scoop were used in some local upgrades of the NA.

I notice no one refered to the 13A from the R130!

RexRyder

iTrader: (10)

.

NZConvertible

RexRyder, that info is totally irrelevant to the actual question being asked, so you look a little silly repeating it. If we're talking official engine designations then most of it isn't even correct.

I has one of those in my '84 Cosmo (factory, not a swap).

But in Japan there is no NA engine in the FC, so no seperate code would be required to differentiate turbo models. Japanese cars use a completely different VIN system to US cars.

fitzwarryne

rexryder- I suggest you read the thread before replying with totally irrelevant matters. I also suggest you actually read the sticky to find out what it says.

The question is whether the 13B engine numbers are in numerical sequence regardless of which version the engine is. In the case of 'gen 2s' did the four principle models have a different engine number sequence?

It was not about the unofficial name each is given as you have reposted. For that I could give you the factory designation if you could read Japanese. There are at least 25 versions of the 13B not just the very few on the sticky. Quite often you can only tell by a casting mark on a specific version. Just deciding whether its 4 or 6 port, NA or turbo or the different multi turbos is simple!

Evil Aviator

Actually, there are some official Mazda references to the 13BT (or rather "13B T" with a space between the B and T). The coding is as follows:

13B NT = Non-turbo 13B
13B T = Turbo II 13B
13B TT = Twin-turbo 13B (13B-REW)

BlaCkPlaGUE

What does the RE and REW stand for?

RexRyder

iTrader: (10)

no problem

RexRyder

iTrader: (10)

Pls read the FAQ. anyways to answer your original question: yes the 13bt does exist in all 2nd generation RX-7 turboII models.

RexRyder

iTrader: (10)

I always thought it meant revised, or reworked. i might be wrong tho

turbomini

yanks are *****.

fitzwarryne

RexRyder:- My question was whether 13BT was an official Mazda designation. The reason for the question was practical. The engine number is required for registration purposes and appears on the registration label. If its a 13B the number reads 13Bxxxxxx, if a 13B turbo engine is fitted should it be 13BTxxxxxx?

The answer to the first part of my question appears to be no, only 13Bxxxxxx.

My second part of my question was whether there was a different engine number sequence between different 13B types. No response yet on that question.

The other interesting point made was that while no JHM reference used 13BT, some local Mazda publications used the designation 13B T, an abreviation of the offical designation 13B turbo- there is no lower case character in Japanese.

ConvertibleNZ:- Sorry I forget only Turbo FC models were sold in Japan. The designation may have only appeared on the SA RX-7[12A T], and the Luce/Cosmo [12A T and 13B T].

NZConvertible

RE is just an abbreviation for Rotary Engine. Mazda have used the RE tag for many years. Early RX's had grille badges that indicated the engine type, "RE10" for 10A-powered cars and "RE12" for 12A-powered cars. Most of Mazda early EFI manifolds had RE cast into them, like the 13B "RE-Super Injection" in the Series 2 HB Cosmo and 13B "RE-EGI" in the GSL-SE.

Mazda added the W to denote a twin-turbo engine. The REW tag was added to the engine code for the 13B-REW in the FD and the 13B-REW and 20B-REW in the JC Cosmo. People often refer to the JC 13B as a "13B-RE" but that's just for clarity's sake since it's cast onto the manifold. It's not the engine's actual designation.

You still don't get it?

Evil Aviator

The code used by your particluar state's Department of Motor Vehicles has nothing to do with Mazda. If your state wants to call the NA engine a "hamburger" and the TII engine a "skateboard", then that's what they will call them.

On US models, the NA and TII have different engine codes (8th character) in the VIN:

JM1FC331 = NA
JM1FC332 = TII

fitzwarryne

[QUOTE=Evil Aviator]The code used by your particluar state's Department of Motor Vehicles has nothing to do with Mazda. If your state wants to call the NA engine a "hamburger" and the TII engine a "skateboard", then that's what they will call them. '


The state department asked me what was cast/stamped on the engine as that is what goes on the registration documents, I presume so they can track down stolen motors.

My interest in the actual engine number sequence is because I have a 1985 12A carby engine with a 7 digit number, and a 1985 12A efi turbo engine which has only a 6 digit number. Yet the body numbers are nearly the same, indicating the body shells were built prior to deciding which engine was to be dropped in. I also had an idea of finding out an engine's year of manufacture by its number as you can tell body age from the vin.

BlaCkPlaGUE

Thx NZ, your infinite knowledge of the Mazda heritage has answered my questions heh.. seriously, thank you!

So W denotes twin turbo, then how come the 13B-RE has twin turbos but no W? The "reworked engine" acronym seems to make more sense to me still.

NZConvertible

The official Mazda designation does have the W in it. Mazda refers to both the FD and JC engines as 13B-REW. Like I said, 13B-RE is simply what's cast onto the UIM.

It has nothing to do with being reworked...

BlaCkPlaGUE

ok i shutup now

thx lol