Ok I want to do a 4.6L swap but having trouble finding some answers. I know the LS1 his a 50lb difrence but how about the 4.6?
I know it dosent have the same power but im looking to autoX this car and I can make due with stock power for now but still want a 50/50 or close to it.
I dont want to do an LS1 because ever one is doing it and i havint found many people doing the 4.6l.
So if any one has any imput let me know im not worried about doing the swap i just want the specs and any pic.
ill make my own motor mounts and stuff.

 

Ok no one have any thing?

 

4.6L is a no go, I was doing a cadillac 4.6 measured it out and its too wide contacts the brake booster.

But im still doing a DOHC engine

I would stray away from "different" swaps unless you are willing to have A LOT of down time and spending the same if not more money then everyone else trying to get it to fit and work.

BTW are you thinkin 32 valve ford 4.6? or which one?

 

www.grannysspeedshop.com Has some Stuff you may want to look at If you are intending on putting a Different Type of engine into the RX7.

 

dude ford 4.6 is a huge engine demention wise. why not the good old 5.0l or even better a 351?

 

4.6l is to wide at the top, but the 5.0l out of a mustang can be done with a little fabricating. just completed mine and fired off for the first time last weekend. you can use a fuel injected engine but you will loose a little bit of ground clearance if want to keep everything under the hood. nobody makes a kit for this so it has to be built completely. i have about 20 hours in fabricating. if you have any question let me know.

 

+1 for the 5.0. No need to shoehorn in a huge engine when a 5.0 can be easily built to meet or exceed the 4.6's power.

LS1 looks to be easiest of all, though. The 5.0 isn't as simple if you want it to sit properly without moving the steering rack.

 

steering rack was had to moved foward and inch and half and a half inch lower. no bump steer problem at all.

 

4.6L DOHC and SOHC variants have both been done before; it's not the best choice for the chassis, especially if handling is your goal. An aluminum 5.3L Gen III Chevy or even an iron 5.3L would be a better choice, if an LS1 is too rich for your blood. Both fit better, and are lighter.

5.0L would work too, though I'm not a Ford guy, so I can't recommend it for you; 88Integra has a great thread to follow if you go that direction.

-Blake

 

you can get 5.3's and 6.0 truck motors with iron block for cheaper than LS1's and the 6 liter has better potential with its larger bores and cubes. take advantage of good heads on those motors


the 4.6 ford is not worth it. only one would be the cobra motor and thsoe are expensive and huge....heavy too. i dont think it would work out well

 

put a 5.0l ford motor in it. ford has a way more better fuel injection system than a chevy motor. plus wiring is a simple task. under 500.00 bucks on wirng kit from painless and a 100.00 computer from autozone and the car will fire right up. plus you really dont want to have to deal with headaches with the chevy wiring. wiring modifications alone are around a grand or more. if you want to find out more on the chevy stuff go to hinsonsupercars.com. they can help you.

 

Wow, that's idiotic.

Where to start...

1980's Ford 5.0 fuel injection better then GM Gen III/IV equipment? Even if you're a Ford fanatic, that doesn't make any sense. 1 burn per use, order only PROM equipment, slow computers, low boost capability, MAF/MAP issues, etc. Old Ford EFI is better then old Chevy EFI, both suck pretty badly compared to modern EFI from EITHER camp.

A modified F-Body harness that plugs right into an FC or FD can be had for under 500 dollars, including a basic performance tuned PCM. Brismo on www.v8rx7forum.com modifies harnesses for ~200 dollars. If you're the slightest bit electronics savvy, the entire modification to an F-Body harness can be done in a couple hours with the diagrams I have on my website (www.ls1fc.com). There are less then 10 wires needed to start the car, total. If you spend thousands of dollars on harness work, I've got a bridge I'll sell you.

And for those who aren't aware, Painless is NOT a good soruce for harnesses; they are massively overpriced, and there are several far better options (www.speartech.com for example).

I have nothing against the 5.0L Ford motors, but for the price, you can get into the Gen III/IV GM V8s, which are a vastly superior platform, stock vs. stock. Beyond that, you're directly interchangable with LS1/LS2 equipment then, should you decide to upgrade later. Add to that easier fitment, better transmission choices, and the ability to keep a stock hood without major firewall or steering rack modification, and it's an easy winner.

Jason, I don't know where you're getting your information, but you may want to update your sources amigo.

 

i was just gonna say... althought the 5.0 intake is better than GM's TPI.... once u go aftermarket its all over.. GM has much much better intakes available

and yes the wiring is easy...not that hard to wire an old 80's Chevy TPI motor.

 

'nuff said.

 

I have a 5.0 in my FB, but if I were swapping into an FC, I would taking a hard look at a yvehC GEN III motor.

5.3 iron blocks are becoming plentiful and are plenty strong!

 

Hey, everybody has their own prefered choice of what they would use. i just suggested the ford 5.0l over the 4.6l because clearance issues. I'm not trying to bash anybody or hurt anybodys feelings, so i suggested an alternate rought. Maybe you need to do a little bit more resesch or talk to someone that knows about the ford setups a little more. you'll find out that the ford engines can produce more power with small cid's than the chevy. also you will find that the chevy guys go to a ford style fuel injection setup and run the FAST efi computer setup also. i deal with this all the time.

 

not to hijack the starter to this thread, but does anyone have any experience with grannysspeedshop swap conversion parts?

i am new to rx7's, i bought an 87, sold the turbo rotary, and have a fully built small block going in... which brings me to my above question.

the 4.6 is a great motor btw, but the difference in clearance is huge!

 

You're talking about OLD Chevy motors. We're talking about LSx series Gen III/IV motors. The F.A.S.T. setups that are used on LS1 motors have NOTHING to do with any factory Ford EFI equipment, aside from both use fuel injectors.

If we were discussing TPI engines, you'd have a point, but we aren't, so...

 

it really doesn't matter which engine. i was just trying to give this man a heads up on the 4.6l ford engine and give him an eaiser solution without having to major modifications to his ride if he was wanting to do a ford swap over the chevy. either way it can be done and have horsepower with no major complications. sounds like this is turning into a ford verses chevy thing anyway. Good luck and mad props on whatever you decide to do man.