I think to much some slap me, 3s < 5s Options

[macavely]

what i was getting at this was what the blocks where designed for .... the 3s-fe/ge/gte for performance and the 5s-fe for ecomey .. yea its like comparing apples and oranges.. but its also like which one tastes better this time of year and apple or orange.... both are great mottor for what they are ment to do... so i was getting at which one does what its ment to do better??? and from thinking about it.. i say the 5s is better at what it does then the 3s is ... simply just by looking at which is in more cars ??

[soven]

so confusing lol .... isnt 3sfe aimed towards economy as well as the 5sfe. Don't worry bout me, I don't even know what is the difference between the two engines

[OOBE]

The numbers only signify a revision of the bottom end; just because it is higher does not necessarily mean it is a larger block...or stronger or better, hehe.

EDIT: I forgot to add...the letters BEFORE the dash mean the engine family or series. The letters AFTER the dash specify the features of the engine, like turbo, supercharger, fuel injection, etc. Here are the letters after the dash!


G - Wide angle Twin Cam (sportier head)
F - Narrow angle Twin Cam (economical head)
T - Turbocharged
Z - Supercharged
E - Electronic Fuel Injection
U - Emissions control (Japanese)
C - Emissions control (Californian).

This post has been edited by OOBE: Jun 20, 2005 - 2:32 AM

[celicaracer18]

what i was getting at this was what the blocks where designed for ....  the 3s-fe/ge/gte  for performance and the 5s-fe for ecomey ..  yea its like comparing apples and oranges.. but its also like  which one tastes better this time of year and apple or orange....  both are great mottor for what they are ment to do...  so i was getting at which one does what its ment to do better???  and from thinking about it.. i say the 5s is better at what it does then the 3s is ... simply just by looking at which is in more cars ??
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ok you can't go by just because the 5s is in more cars. toyota puts the 5s in more cars because they sell more econmy cars than they do performance hence why they have pretty much stopped makeing performance oriented cars, celica, supra, mr2

[Kwanza26]

The only reason it was designated "5S" is because the block is physically different from the 3S (taller). True the blocks vary by number, but typically with Toyota, unless the changes are fairly big, as in stroke changes or bore changes, they don't re-number the block codes. Bigger numbers doesn't always mean better... and the 5S bottom-end is by no means any better than the 3S bottom-end... in fact, the 5S is far inferior, IMO. Its not a performance oriented design...

Also, when an engine is stroked, basically the stroke value is increased. What affects the stroke value? rods, or crank. In most cases, the crank is what most affects the stroke value, although stroking an engine requires a bit more technical work than simply throwing in a crank with a larger stroke. The 5S crank can be used to "stroke" a 3S bottom-end... but regardless of the set-up, whether it be stroke with the 5S crank, or a 5SG hybrid, either custom rods or custom pistons are gonna be needed.

All in all, dispite of what the MR2 guys may want to think, the 5SFE bottom-end has a very apparent weakness when it comes to making horsepower. It has fairly short rods for its stroke, so speaking from a performance standpoint, it's not so great. The 3S on the other hand, is a squared design... and you really can't go wrong with a squared performance engine.

[bigblock261]

I would, however, love for someone to explain how replacing a crank increases displacement, since it's the size of the combustion chambers contained in the head which determine displacement.
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Just for the record, plain and simple, the displacement of an engine is determined by the volume of the cylinders that are swept by the pistons. Bore and stroke. Pistons and crankshaft. For 4 cylinders the formula is: bore x bore x stroke x 3.141592654 (pi).

As has been discussed, changing to a crank with a longer stroke will increase displacement, but the pistons and/or rods also have to be changed to address piston height dimension conditions, meaning the piston can travel lower into the bore but not higher than stock. A stroker kit solves all these issues.

Now, compression ratio IS determined by the size of the combustion chamber. Small chambers equal high compression.

[soulshadow]

Toyota's got a weird line up of engines. It goes somewhere from old = best to new= worst. Take a look at the 4ages and the 7mges.

4age = better than a 7afe
5mge= better than a 7mge
3s= better than a 5s

Am I right in a sense?

[samguglielmo]

So from the quick tutorial that I have gathered would it be fair to say a person with a 3sfe would simply need to change the head to make it a 3sge ??(according to material stated above)??

This post has been edited by samguglielmo: Oct 13, 2005 - 10:38 PM

[samguglielmo]

Can anyone let me know if this is a fair statement?

[Dr_Tweak]

The number has nothing to do with how "good" the engine is, it's just the number to designate that engine.

[zachattack15]

*slaps you* there you go


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[JoKeRkId613]

If lower the number, better the engine, How could a 4age be better than a 5sfe, or a 1zz better than a 2jz?
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I thought the 4A-GE was stronger/better/whatever than the 5S. I don't understand what you mean by "better". Get a Blacktop 4A and I'm pretty sure you can spank a 5S.