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13b rotary on a Datsun 240z


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Hello to all,

Has anyone seen or heard a 13b rotary engine on a Datsun Z before?

I will swap out my 83 turbo engine this summer with a rotary...

any input, good or bad, would be appreciated.

Thanks,

Cel

LOL

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If I remember correctly my wife's old '82 RX7 had a 12A and my sisters '82 GL had the 13B, or was it only starting with the second generation cars. I believe they are both a 2 rotor motor at between 1.1 and 1.3 liters respectively and are not bad but unless you go with turbos I don't think it will be an improvement. I am sure they would be a lot lighter than the Z motor. It is fun to spin to 8k RPM but neither of them could keep up with my Z. It would be interesting in a 510!

By the way, when selecting an engine look for signs of oil leaking between the rotor sections. Once those seals go the oil spews everywhere and you pretty much trash it and buy another one.

Just my opinion! Have fun!

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Hey Royce,

Thanks for the input.. I forgot to mention that the 13b that I'm swapping is a bridge port with a camden supercharger, 350+ hp.

I would love to test my toy with yours someday...:D

Thanks again,

Cel

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If my RX7 lovin' pals heard you blasphemin' like that, they would never let me live it down. Those spinich-eating weedeater powered rotarys have no business in a prescious jewell like a two-four-0!

Just kidding! It sounds like a lot of HP to play with:D Give an update if you make it happen.

Racer-19

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I have raced against those darn rotary engines and as much as I hate to admit it, they can make something like an RX-3 scream. Anything that small, that can take a brick like an RX-3, and make it move like they do must have something going for it.

I will admit, the last generation RX-7 would have been on my wanted list if it had not been for the price. But then, if I had that kind of money laying around, I probably would have bought the last of the 300ZX Twin Turbo's and had something I really wanted.:P

A small compact engine like that in a Z does sound interesting. With the power available, and the lower center of gravity it might be something a lot of people will sit up and take notice of. But with the number of rotary engine swaps I've seen done to 510's I'm starting to wonder why there haven't been more of the later engines put in a Z. :eek:

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I haven't seen a 13B in a 240, but Tod Kaneko a featured car builder in a copy of Super Street i happened to have, has one in a 510 that puts out 500hp. It's hooked up to a custom Garretts racing turbo charger. Then again he has a 240 with an L28 hooked up to a Garrett/HKS turbo that puts out the same.

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modified rotary = good hp & short life

bridge port rotary = very good hp & very short life.

I believe that firewall/tunnel modifications are required to fit a 12A into a 510. I don't expect this to be the case with a S30/S130, but bear in mind that even the 13BT from the SIV & SV RX-7 was only a 200HP motor & had relatively low torque.

A 20BTT from a Cosmo would be another matter.....

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  • 1 month later...

The Z doctor in Roanoke VA did it with a 240 and a NA rotary. Then went up to a turbo rotary. It screamed!!!! It was way too fast! This is also back in 96...Rob Robinson built it (who worked for Z doc) and they could point you in the right direction.

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BAD BAD BAD BAD!!! Don't do it don't do it. You be going around putting Mazda parts in a Z!! Come on lets not be playing for both teams here!!:D

Seriously though I would certainly be looking at this with a bit more thought. For the same amount on money you could put an RB20DET in it. Now threres an engine!! More power than the crappy rotary and much more durability. If you have any mates with rotas then you would probably know the problems they cause there owners. Yes if done properly it might be be kind of ok but theres just no comparision between a six and a rota anyway thats my view hope you take my advise, you won't regret it

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Timmy,

If you could tell me where in the USA I could get a RB20DET for the same amount on a Mazda 13b engine for only $400.00 and all you have to do is to port to gain massive HP.. I would certainly do it in a heartbeat.

Please let me know…mate...

Cel

PS

Just by porting alone on a normal aspirated 13b, you can gain beyond 300+ hp...plus considering the weight ratio on the 13b

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Wouldn't have a clue about RB20DET engines in America being in Australia and all but over here they are very fairly priced (probably cause were so close to Japan). No doubt you can 300hp out of a naturally aspirated 13b but you will have an engine with a short life span and hardly any torque! If you can find an RB20DET for a decent price then it would be they way to go and the housepower capabilities are huge only slightly more than the rota but high hp rotas don't like idling or driving normally, you either have to be going full throttle or not at all, you might want that but if its for road use you might get into trouble. Fact is you will never get any where near as much life and durability out of a 13b as you would out of the Nissan engine, keep that in mind.

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Tim,

Seems like you have something against a competitor engine...no problem. I admit, Nissan engines are way better but I really would like to get a rota on a Z this year...something different. I've seen many V6, V8, L6 engine swaps...Ford, Chevy etc. Why not a Rotary??? nothing last forever...but if you have the knowledge and the supply, sky is the limit.

Cel LOL

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Originally posted by Cels240

Tim,

Seems like you have something against a competitor engine...no problem. I admit, Nissan engines are way better but I really would like to get a rota on a Z this year...something different. I've seen many V6, V8, L6 engine swaps...Ford, Chevy etc. Why not a Rotary??? nothing last forever...but if you have the knowledge and the supply, sky is the limit.

Cel LOL

Yeah i am quite biased towards Nissan but hey good luck to ya, hope the conversion goes well. Drop me a line when its in cause i'd love to know how you went about it.

Happy converting!!!

Tim

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It has been done, it was posted on the Z car garage website, not exactly sure in which section ( performance tips? )

A Z Guru put one in the car and apparently took it autocrossing and took a few turns on 2 wheels.

Matt

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  • 3 weeks later...

Im glad I found this thread :D

I'm also considering doing a rotary swap for a nice project car. Cels, you may have some friendly local California competition ;)

Ive read about the rotary 510's...and have yet to see a rotary 240Z.

I put a brand new street ported engine in my FD when it blew...I have the extra sitting in my garage just gathering dust. It's the 13B-REW and I have an extra set of stock twin turbos, fuel delivery, upper + lower intake manifolds, throttle body, ecu, wiring harness, accesorries...etc etc. Basically I just need to buy a new set of apex seals and 1 rotor housing, and some minor porting and milling to have a nice new strong 300fhp engine.

Somehow some of you guys can fit LT1's inside the Z's...so i'm figuring a nice lightweight 13B-REW should be able to fit. Ideally, i'd like to think the engine can be mounted centrally for an optimum weight balance...but since i'm not too well read on Z's I really have no idea if any of this would be realistic if I were hoping to keep a minimal budget. My RX7 already eats up enough money as it is :D

If someone could please direct me to a 240 Z FAQ page with weight distr. info, engine compartment space, or any swap type of page, it would be greatly apreciated!

I'm already eyeing a few shells, but I really need to get more research done on the car before I go ahead with this project. If not, I'm putting the engine in an '86 Corolla GT-S hatchback ;)

Cheers

Mike

-1993 Mazda RX7 R1

-new street ported 13B-REW

-3mm apex seals

-A'pexi GT spec catback with 3.75" piping

-A'pexi Power Intake

-A'pexi Power FC ECU

-3" downpipe

-ACT S/S Clutch

-very loud

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