Slo_greyfc

I couldn’t find any info on this specific topic it’s probably out there but no luck finding it. So I want to put a 4 port into my 6 port chassis and I’ve had people say I could just use all the stuff from my 6 port motor and just slap it in the 4 port and in theory it should be fine. But the stickler is the LIM as some were saying I would need to port the 6 port and make it match the 4 port motor which makes sense but there’s no reference for me to go off. Just wondering if anyone has done this and if there is any templates out there that will make my life a little easier.

WondrousBread

You can do what you're planning (swap the accessories over and send it), with three considerations:

1. The four port engines have a coolant port in the front housing that flows through the LIM. You'll need to block this off. I think you can just use a freeze plug and some RTV.

2. The porting, as you've mentioned. I don't believe there is a ready template available, so your best bet is to buy a four port LIM to block gasket, and use that as your template. Keeping in mind that if you grind too far you might grind through the runner into open air. You will of course be losing the auxiliary port sleeves and actuators, since they serve no purpose on a four port engine.

3. S5 engines (and I think all JDM engines) have no EGR port. So you will need to block off the tube that runs to the EGR from the vacuum spider, if retaining it.

This assumes that the four port engine is out of an FC Turbo II, as other four port engines won't have the engine mounts in the right place and will require additional work.

To give a more complete answer, what is it you're trying to achieve? Is there a reason you want the four port engine specifically, or is it for cost / availability, or is it just what you have around?

Slo_greyfc

It’s an s4 4 port that I’m putting into my s4 6 port chassis which from what I’ve heard is relatively easy but how much space do I have before I would end up grinding into the open air.

Dak

I used TII rotor housings and with a freeze plug alone mine leaked. What I ended up doing was using the factory O-ring the TII uses with the freeze plug and was then leak free. I didn't think of RTV at the time.

I found this in another thread. Should give you an idea of what you'll have to do put the 6-port LIM on the 4-port block.

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WondrousBread

Sure, but what I'm asking is why you want to use a 4 port engine NA with 6 port manifolds? It can be done, I'm just curious why you've chosen to go that route vs another 6 port block, or using the 4 port with ITBs.

Slo_greyfc

well my car is a 6 port and I just went and bought a 4 port motor so in the future I could run a cool itb setup but for the current moment I just wanted to run the motor off of all my 6 port stuff including the intake.

WondrousBread

Okay, that makes perfect sense then. I was just curious what you wanted to achieve to see if there was a better way of going about it.

Your plan sounds like a good one. I've heard from more than one place that the 6 port manifolds flow a lot better than the TII 4 port manifolds for NA use, so this should get you decent power until you move to the ITBs.

Slo_greyfc

Ok thank you guys a lot with that pic and the extra info I feel a lot more confident about messing around with this intake. I’ll try to keep an update with the build