Engine swap ?

Typrus · Post by **Typrus** » Tue Nov 23, 2004 5:32 pm

So what kind of engine do you have to look for? RWD-type or FWD type (non-traverse) I too want more torque. A diesel would be nice but then I'd have to do a tranny swap which I am not up for, knowing nothing about tranny swaps. Would a really minor porting job be too much of a waste on a 3A-C? I know porting will increase efficiency (if your foot isn't in it too much) but dunno how much. Also, would headers be worth anything? V8's get around 28 horses out of them but I can't imagine seeing more than 15 in a 4-cyl. Also, Is there an easily swappable head that has more'n 8 valves? 12 or 16 would be nice, but I dunno if such a head exists. I know you can find bigger carbs, but how about slightly upped intake manifolds? Can a higher volume oil pump be found?

GTSSportCoupe · Post by **GTSSportCoupe** » Wed Nov 24, 2004 7:13 am

The Toyota 'A' series engines are the ones easiest to install into the tercel. Most of them are from fwds, so some custom work will have to be done.

Here is a list of most toyota engines, along with their specs. Look at the 'A' series engines: <a href='http://www.geocities.com/MotorCity/Pit/ ... gines.html' target='_blank'>http://www.geocities.com/MotorCity/Pit/ ... es.html</a>

GTSSportCoupe · Post by **GTSSportCoupe** » Thu Nov 25, 2004 7:57 am

Teddy wrote: Yes, I will carefully document the build of my 7A-C. I have discarded the 4A-C and 4AF-E motor swaps because they just don't net enough power gains over the 3A-C to justify the swap (for me), I discarded the 4AG-E because the motor is a little peakier than I would like in my offroadmobile, and the 7AF-E because the torque might blow up my driveline (not to mention the underhood complexities of the MegaSquirt fuel injection if I don't use the stock injection, intake and exhaust routing, etc).

So, I have settled on the 7A-C, with big valves for good midrange performance (with a minor penalty in the low end, due to lower intake charge velocities).

My current 3A-C has about 220,000 miles on it, has leaking valves, low compression, lots of smoke, and starts every day

I will be re-using the Weber carb I have on the current motor, and making a slightly bigger intake plenum for the runners. I will be having the headers custom made by a shop in Auburn, Washington that specializes in that.

By the way, for any of you who are interested in Tercel hotrodding, the 3A-S motors from Japan (JDM) have a MUCH better exhaust manifold... the twin outlet downpipe setup breathes WAY BETTER than the U.S. single outlet manifold. They can be purchased from Japanese salvage yards for almost nothing... the shipping will certainly cost more than the manifold. Those engines ALSO came with a cool looking dual carb setup (called Toyota Super Twin Power), that does NOT make any more power than a single Weber does. So, don't bother.

We have dynoed the 3A-S at 80 horsepower, and the 3A-C at 63... so.

For the 7A-C motor, I have already determined that all of the oil ports and galleys line up, and the accessories WILL bolt up (but, some of them in slightly different locations or elevations).

I will photodocument the swap process, and note part numbers/sizes and caveats for the clutch/flywheel/tranny, engine pulleys, mounts and etc.

It looks like either the Porsche 924 or the 944 timing belt is the way to go, to allow the taller 7A block to spin the cam in the 'C' type head. I will document this, as well. Timing SHOULD be cake, since as long as the number of teeth on the belt are increased by an eveb multilple, crank to cam interface/spin rates stay constant.

I will be overboring the 7A by 30 over, and using Total Seal rings... decking the head, I expect about 10.5:1 compression, which will mandate some hefty timing retard, to avoid ping. I plan on having a local tranny shop (Sea-Tac Transmission) rebuild the 6 speed tranny for me, and I will install new tranny mount and shift bushings when I do the swap.

Lastly, I will be using the stock radiator footprint, but having one custom built by a local radiator shop that is twice as deep (more cores, aluminum).

- Teddy
Seattle, Washington

Thought I'd copy and past the above quote into this thread (from another thread on this forum). This fellow is pretty serious about building a 7AC. Seems he has the ability/experience to make it happen successfully. I can't wait to see how it goes.

ur_mom · Post by **ur_mom** » Tue Dec 07, 2004 4:34 am

just put int 4fte

20vtercel · Post by **20vtercel** » Tue Dec 07, 2004 9:46 am

ur_mom wrote: just put int 4fte

4efte (i think is what you wanted to say) are great engines except for one thing...they are transverly set only and there is no rwd tranny that will bolt up to it. Not to mention that you have to replace valve stem seals every 60k miles. They are not the best engineered engines on the face of the earth. 4age is the same price and will have less effort for istallation and tuning. 4Efte is also only a 1.3l engine so torque values are lower even tho it is T/C'd.