I know this topic is somewhere in this forum but I can't seem to find it...How can u tell the differences between an S4 TII engine and an S5 TII engine...Other than the power differences, how can you tell by looking at the block...I know this is a newb question but im a newb, so theres the question...I'm finally able to look for an engine for my TII and don't want to get jipped...Thanx for the help...

 

the S5 OMP is electrical as opposed to the mechanical S4 unit.

 

The whole story is in the FAQ & stickie threads at the top of the forum.

 

I was needing to know the same thing. I want to make sure the importer im using will send me an s4 engine, not an s5

 

if he sends you an s5 hes retarded because its worth more

 

take the S5, thats what im doing this summer. S4 -> S5. ITs a pretty straightforward swap. The front cover w/ OMP and throttle body i think are the only things that dont plug right in. At least thats what i hear.

 

look at TPS on front of throttle body. 2 for S5 and 1 for S4, omp. I've heard s4 rotors can handle more boost before collapsing... Might have to do with lower compression though...

 

thanx for the help

 

all this is true but really to tell you the truth unless the car hasn't been messed with at all by a previous owner(s) then you will never know until you break your engin down for a rebuild. I have an 88rx7 tII that I always thought the motor was s4 because it had the metal line going up the font of the engine for the mop, the lim and uim where both s4 and the tps was the s4 style one. Then when I broke it down for a rebuild SonicRat said hey look at that s5 rotors and housings.

 

Do the S5 TII motors still use the lightened rotating assembly but retain the 7k redline of the S4s?

 

Yes

 

s5's have a reinforced rear plate.

 

Search!

http://www.fc3spro.com/TECH/FAQ/ZVK/zvk.html


-Ted

 

Where would we all be without RETed and his great avatars?

 

Also i do beleave that you wont find NSU Wankel on the Irons ether

 

wow...i didnt even know NSU still had claim to the rotary. thats awesome.