Trevor E

So i’ve found this short block 13b from an fc that i could put into my 84 rx7 gslse. Could I just swap everything over instead of buying all of the parts?

KansasCityREPU

iTrader: (9)

You would need to transfer the front cover and oil pan at a minimum. I've never done it but folks here have. I'm not sure about the intake. It really depends if the FC block is a 4 or 6 port.

peejay

The engine will not have a functional emissions system. The GSL-SE engine injected air pump air through a port under the primary ports, the Series 4 FC N/A engine did not, there is no port there. If emissions is not a concern, there is also a slight primary port mismatch but nothing severe.

You would be able to get away with using the FC intake manifold, but you'd be on your own for figuring out how to make the ACV function correctly. Otherwise, the Series 4 intake manifold is a pretty significant performance upgrade from the GSL-SE intake manifold and it used to be a popular upgrade.

The flywheel needs to match the engine, so your core engine will need to have that on it. I think the clutch also needs to be used. I have an FC flywheel and it turns out that FB 225mm pressure plates do not fit it, the strap rivet is in the wrong place and will not clear the outer ring on the flywheel.

In 2021 I would expect any FC engine on the ground to have a blown coolant seal land, I would treat it as potentially bad until proven good.

diabolical1

iTrader: (3)

welcome to the board.

swapping everything is what you'd have to do anyway. because there are relatively minor physical differences between the blocks, but there are fairly major differences between how they were setup to operate in the Gen 1 and Gen 2 cars. the thing you probably need to specify (as KansasCityREPU mentioned) is if it's a 6 port or a 4 port block that you have acquired. i am only speaking in the scenario of the 6 port engine.

in addition to the 2 parts mentioned above, you will need to put these parts from your SE on it:
- distributor
- intake
-fuel injectors (and if they have not been tended to recently, then now is probably a good time to do so)
- exhaust

Edit -
i left my main response as i originally typed it, but just keep in mind that i started typing before peejay made his response, so i was not ignoring his post. it simply was not there yet when i started mine.

j9fd3s

iTrader: (3)

+3 the FC engine needs the GSL-SE front cover and oil pan to go in. the S5 engine is plug and play, the S4 engine blocks off the emissions. either engine adds some power. its a good combination, even just using the GSL-SE intakes and EFI

like PJ says the odds of a used engine being good are small

Trevor E

So i’d get an fc intake manifold in case i’d ever turbo charge it, fc flywheel fc clutch? It’s a 6 port that has 7k km since rebuild, i’m looking at buying it for under 2k

Trevor E

The engine will not have a functional emissions system. The GSL-SE engine injected air pump air through a port under the primary ports, the Series 4 FC N/A engine did not, there is no port there. If emissions is not a concern, there is also a slight primary port mismatch but nothing severe.

You would be able to get away with using the FC intake manifold, but you'd be on your own for figuring out how to make the ACV function correctly. Otherwise, the Series 4 intake manifold is a pretty significant performance upgrade from the GSL-SE intake manifold and it used to be a popular upgrade.

The flywheel needs to match the engine, so your core engine will need to have that on it. I think the clutch also needs to be used. I have an FC flywheel and it turns out that FB 225mm pressure plates do not fit it, the strap rivet is in the wrong place and will not clear the outer ring on the flywheel.

In 2021 I would expect any FC engine on the ground to have a blown coolant seal land, I would treat it as potentially bad until proven good.



Id probably use an s5 turbo intake, the engine has 7k km on it since rebuild. 6 port

So could i use everything on the fb engine on the fc now? Probably just the distributor lol, so might as well buy all new stuff

peejay

I think you have some things confused.
If you want the emissions system to work AND use your existing intake manifold, you would need a Series 5 N/A engine. These are so rare that I forgot they existed.

I would not use the turbo intake on anything. It's garbage. All it is good for is clearing a turbocharger. The Turbo II needed like 7 pounds of boost (50% more manifold pressure) to make only 25% more power, despite the turbo block having much better intake and exhaust ports for making power. The intake manifold chokes it, it is heavily pinched so they could fit a turbo next to the steering column in a RHD car. The non turbo intake manifold is far, far, far better. Even the GSL-SE one.

And that is talking about using it on a Turbo II block! If you put it on a 6 port you make all of the problems worse because you either have severe port mismatch, or you open the ports up and cause a severe port area change in the middle of where it is trying to turn, which is a recipe for stalled and even reverse flow in the port.

diabolical1

iTrader: (3)

no. don't try to use the T2 intake. there is no point to it. you mentioned possibly turbocharging in the future, but cross that bridge when you get there. whatever mismatch there is between the SE manifold and S4 engine is still nothing compared to using the T2 unit.

yes. use the SE stuff on the engine. it's the quickest route to a running car. from the factory, the SE is not equipped to run the Gen 2 stuff, you would have to figure out how to make it so.

one quick note i should mention is my inclusion of the exhaust on my list. i thought about it, and my car was a 12A car that i put the 13B in, not an SE, so you should be fine.