98+ 5S-FE picture thread., Might be of interest to you if planning to go EMS. Options

[Syaoran]

So I bought a new 5S-FE engine for a total of $963. It's the newer 5S-FE which comes with various upgrades, some of which include a crank angle sensor, cam angle sensor and 2 coils for a distributorless ignition.

I'll put some pics with descriptions where necessary, and I've found this is the engine to buy and build if you're going the 5S-FE route, be it N/A or F/I, or 5S-GTE. It's more EMS-friendly than the older engines, I'll explain why with the pics.


Even though the newer engine is better in some things, the older ones are better in others. Here are the fuel rails side-by-side.



As you can see, the injectors are the same. However if you look closely, the new 98+ rail is returnless (as it came in the engine I bought, they had 2 and both were the same). It is also smaller, much smaller.


Returnless systems are worse than ones with return because the AFRs are less stable. The return system basically uses the fuel pressure regulator to keep the system feeding fuel to the engine more constantly. Ideally you'd install an adjustable FPR, but in my case that won't be necessary for the time being. The stock FPR I believe runs at 43.5PSI of pressure which is good enough.



Here's one of the more important pics:



That is the crank angle sensor wheel. I consulted with a friend of mine who has experience with these, and he told me it's a 36-2 wheel. It's missing 2 consecutive teeth. The beginning and end of that longer tooth slightly protrude, so you can count 32 separate teeth plus 2 on that longer one, and it's missing another two.

The engine I bought also has this:



That's a cam angle sensor with a single tooth. I'm not sure what the tooth indicates the sensor (camshaft position) but I believe it is either TDC or several degrees BTDC.


Here are the coils:



They're 2, 1 for each 2 spark plugs. They have 4 wires and I believe they are power, ground, signal and spark confirmation. I have to consult a wiring diagram to confirm that.

That's it for now, I'll add more pics as I go through the engine. You can request any pics you'd like.

[Syaoran]

I haven't updated this in a while, but I just haven't gotten around to do anything else. I plan on taking the block to the machine shop to have it refreshed, see what bearings I need, etc. and to have the crankshaft ground down to accept 3S-GTE stock rods.

I initially was worried that the 3SGTE rods would weight much more than the 5SFE rods, but weighing them with my hands there's barely any difference. The 3S rods have more meat everywhere, so they must be heavier, but not significantly heavier. That means that it shouldn't adversely affect my engine in any way.

Speaking of which, here's a pic of a 3SGTE rod and a 5SFE rod. This 5SFE rod is one from my older 5S. The 5S rods are the same from either revision.

Notice how the 3S small end is thicker above the pin hole. I think this is due to offset pin on the rod? The 5S pin is centered right in the middle, while the 3S holds the piston pin lower, making the piston sit lower in the combustion chamber, perhaps to lower compression?
Top: 5S-FE
Bottom: 3S-GTE (2nd gen MR2 engine)



Another speck of information I can give you: 5S-FE piston rings changed sizes in the final revision of the 5S-FE.

Pre-98 piston rings: 1.5mm x 1.5mm x 4.0mm, that stands for a 1.5mm compression ring, 1.5mm scraper ring, and a 4.0mm oil control ring.

Post-98 piston rings: 1.2mm x 1.2mm x 3.0mm, same as above but with these sizes.

Here's two e-bay listings showing this: (for people seeing this in the future, you'll possibly not be able to see the listing, so search for seller mizumoauto and search for 90-99 celica piston rings and 98-01 camry solara piston rings)

Pre-98 piston rings: Link
Post-98 pistons + rings: Link

The question remaining is why did they reduce the ring size by .3mm for the first 2 rings and by 1mm for the oil ring. Shouldn't larger rings be better in terms of durability?

This post has been edited by Syaoran: Mar 15, 2013 - 1:24 AM