I didnt find any info about differences in 12a engines. Are there any differences in 1st, 2nd and 3rd series engines? Can i swap parts between them?
Lets say that i have -84 engine. It blows up. I find -82 "scrapyard" engine. Wicth parts i can use?
Thanks
I think the main difference is the oil cooling. Your \'84 S3 will have a beehive oil cooler on the engine, your \'82 S2 will have the cooler under the radiator. The S2 radiator is therefore shorter than the S3 so that the cooler will fit under.
The S2 clutch is smaller diameter than the S3. The S3 is 225mm.
I think the S1 engine is similar to S2 but might have points ignition. At sometime there was a power increase, but don\'t know which engine that came with. Possibly with the S2 but the increased clutch definitely came with the S3.
The engine builders on here might have better information.
Hope that helps
The only bit of use I can add is that I believe the power increase was from S1 to S2.
Interesting topic. Signed!
http://www.rx7club.com/showthread.php?t=938481&highlight=differences+12A
Ahhhh....need to be specific here then.
I\'m referring to UK 1st Generation 12A engines, all of which were thermal reactor / carburettor types from the factory. That\'s right isn\'t it?
Weren\'t the US engines fuel injection in the later 1st Gen 12A\'s?; the link says no thermal reactor on the later engines.
Quote from: David Nock;749780Ahhhh....need to be specific here then.
I\'m referring to UK 1st Generation 12A engines, all of which were thermal reactor / carburettor types from the factory. That\'s right isn\'t it?
Weren\'t the US engines fuel injection in the later 1st Gen 12A\'s?; the link says no thermal reactor on the later engines.
as far as I\'m aware, all 1st gen 12a\'s were carb\'d with the exception of the 12a savanna turbo which was JDM only. The US fuel injected cars ( GSL-SE) were all 13b\'s.
I think you are right Ian, as I\'ve never read any different.
Ok, thanks for the info :)
can you run them without the thermal reactor and just have a normal manifold?
Quote from: vin likes diesel;749886can you run them without the thermal reactor and just have a normal manifold?
Its a must !
Yeah deffo, ditch all that crap.
See! i told you i knew nothing about these engines.lol.
yeah, chuck that emission crap in the bin and free up those horses! Best bang for your buck is to put headers on it and a decent exhaust.
Ya, thats a 1st step. And you get save lots of weight when you lose that original exhaust.
2nd step is rebuild carburator. And port and clean manifold, so it will flow nicely. Line up carb to manifold and manifold to engine. Me and my brother noticed that they do not line up well. Its easy to do and you get few extra horses. (i would imagine) I dont know how far you can go with original manifold and carb. But if engine is stock, those modifications should help engine to breathe better.
The best, easiest and cheapest diy mods to get that extra power I\'ve found are:
* headers and a full performance exhaust
* mechanical secondaries
* Cut a hole in the back of the air filter can to increase the airflow
* lose the viscous fan which acts as a big brake on your revs
After this you\'re into porting which is a more involved / expensive then forced induction.
Mechanical secondaries??? Info please...? :confused:
There are two ways of going mechanical, the ghetto way or the posh way haha. It can be achieved by simply linking the throttle mechanism to the secondary lever on the carb with a cable tie or thin wire. This will open the seconday butterflies at the same time as the primaries but will hit fuel economy even more (if you are bothered and let\'s face it not many of us are) and will also require you to fettle the fuelling slightly as your carbs new found urgency for fuel will give you a hiccup if you suddenly hit the loud pedal. All this involves is giving the fuel bowl a little more capacity with a sandwich plate. It\'s worth it though as they sound awesome with this mod too.
cheers for the info, looks like the exhaust will be going then. A carb rebuild is already on the list.
I am not going for hp, just a reliable daily and rather than cut a hole in the air filter i was going to put a kn complete round filter on top of the original filter casing.
I agree with the fiscous fan but also for my engine swap this will have to come off because of the space so a rad will fit. cheers vin
If you\'re gonna run an open air filter I\'d heat wrap the manifold mate rotang exhausts get hellahot.
Quote from: captainbizzaro;749985If you\'re gonna run an open air filter I\'d heat wrap the manifold mate rotang exhausts get hellahot.
All good advice, well worth joining the club.:Thumbs-up
in hot weather, an aftermarket air filter is fine but in the colder months, the 12a rotary needs warm air from the manifold to go into the inlet until the engine gets up to temperature... lose this source of warm air and the car may run like a dog until it gets warm. The blue air filter box does this automatically.
The guys in the usa use alot of after market filters but lots of them live in warmer climes than us.