my car is a 1979 Rx7. the car is pretty much mint in all ways except for the Carbed 12A (points ignition). The engine smokes above 3000rpm and its a carbed rotary so it sounds like *** also the ignition is arcaic. im tired of replacing seals and *** in this engine every 60-70k miles so an engine swap is needed. My first choice is a GM LS1 or LS6, but those are a bit expensive. what kind of options do i have as far as FR engines. My requirements are as follows.
.Lightweight (no iron block V8s)
.relativly inexpensive
.decent aftermarket support
.more than 100bhp
.not a rotary

any ideas?  

i have seen everything from sr20det motors to the Chevy ls1, we have a saying around here, with enough time, money and knowledge you can do anything.  

mebbe a Grand national v6?
k24de? with a turbo setup?
1jz-gte? 2jz might be too 'specive...  

well, why not a rotory? If you go with a 13B from a later model (does not need to be turbo) it would be more reliable and you would get fuel injection.  

to me even the 13b is not that reliable, a rx-7 to me is not a everyday car, if i had one i would have another car just in case the rx-7 didn't want to go, they are way to fussy, especially in cold climates.  

I wonder if anyone's ever swapped a Miata engine into an RX-7? It's the same company, and for the Miata engine there's tons of parts. Try looking at dedicated Mazda boards, you may find some Frankensteined RX-7s there.

I was about to suggest looking at what some of the GRM $200X Challenge cars ran, but then I read the lightweight part, which basically nixes that idea. There are lots of RWD Japanese and European tin with American V-8s in the nose in that competition (including V-8 FC3S RX-7s), but those are all old iron-block V-8s out of cars like 5.0L 'Stangs and work vans. You could still look at the fabrication for those cars to get an idea of what's involved in a V-8 swap.  

Id be more prepared to see a Miata stuffed with a 13b instead.  The miata engine, while stout and with a fair potential, isnt worth the transplant unless the old engine is litterally fused into a single piece of metal.  

Hey anyone ever think about the Mazda 3 or 6 motors?  For some reason I never hear anyone talking about swapping those motors even in Mazda cars....how bout an LT1 from the older Vettes?  

The old MX-3 and MX-6 or the new Mazda3/6?  

The old ones were horrible, the new ones arent bad: mazdaspeed has gotten a great power out of the 6.  

Yeah the new Mazda 3/6.  I dont even know what the old ones look like lol.  But yeah I've never heard of anyone swapping those engines but it could be a goood idea.  

The vette's LT1 are Iron block with Aluminum heads...I had thought of getting one with a 6 speed for my elco for ~$2k  

check out my profile about an mx3 thats modded all aluminum v6 2.5L of dispalacement and 200+hp stock with about 189lb ft of torque thats right torque!! not a bad motor at all just make sure you shim the oil pump or get a melling and you will be fine they rev stock to 7800 rpm there are photos somewhere of one swapped into a miata actually on the net super clean. one shipped from jdm engine core is bout $900 which trounces b series hondas in price and there is actually a large aftermarket for these motors  

did i get it right that v6 worth 2k? or some parts of v6??





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