How can I distinguish engine wise from a Turbo S4 to S5. I need to buy a rotor and I do not know if this engine an S4 or S5.

Thanks

 

Does someone know of any threads were somebody explains this.

 

Are you looking at the whole engine? The most distinguishing thing between a S4 and S5 block is the EGR port on the center plate on the S4; the S5 has no EGR port.

 

yeah there are only about 50 of them...

S5 will have an electrical MOP is probably the easiest check

 

Won't have a EGR port if it is Jspec regardless of series.

 

Weigh the rotor.
S4 is over 10 lbs.
S5 is under 10 lbs.


-Ted

 

the engine... I do know is a J-spect. So theres no EGR valve. I will check the weights of the rotors. Is there any other way to check this.

 

Been covered thousands of times...literally.
http://fc3spro.com/TECH/FAQ/ZVK/zvk.html


-Ted

 

Thanx for the info ... But I am very confuse or I have an S4 with S5 rotors. I weighted them and the rotors were about 9 lbs and 10 onz. I have had this engine since July of 2004 and I did not know the year of it. I have heard of people putting S4 rotors to an S5 but not S5 to S4 what should I expect from this engine been an S4 with S5 rotors?

 

Well is it in under 10bls S5 rotor. But another way to tell the engine apart is the thermo neck it wil have a fill cap (for the radaitor) almost close to the alternator. S5 has no fill neck near the engine. Thats just from my observation.

 

According to this
http://fc3spro.com/TECH/FAQ/ZVK/zvk.html

My engine is an S4 (Intake manifold is the short style, One TPS, Turbo passages are asymmetrical.) But the rotors for some reason are S5.

 

s5 rotors are lighter and is one of the reasons why the s5 produced a higher rpm and more power. Im sure youll be fine with those rotors in the s4, becuase ive heard of those being interchable. It would be considered an upgrade to have s5 rotors in a s4 engine.
- Oh edit.
the s4 rotors are more durable and can handle higher hp applications and is the reason why some ppl seek s4 rotors in there s5 motors or use them in racing engines.

 

For all intent and purposes, the rotors are identical in dimensions, but just the weights are different.
As long as you're using the correct / matching counterweights / flywheel, you are able to change rotors like that without any problems.

You have the engine apart?


-Ted

 

I was about to say that ... I use s4 rotors in my highly modified s5 block. They can handle a lot higher boost applications. Granted this is if you plan to run 20+ psi. If not, I'd stick witht he s5 rotors, theyll produce quicker response from their higher compression.

 

also whith the water pump doesnt it l differ from s4 to s5

 

That is correct.

-Ted

 

Yes the engine is apart. I also hope that who ever built this motor with S5 rotors match the counterweights and flywheel. Any way of telling if the counterweight and flywheel are the S5 type.

 

Right....I am not looking to produce 20+psi but I will want to go up to at leat 12 psi using a stock turbo. The motor is street ported and I will be using a Wolf 3d ver 4 standalone. In witch all of it is going into a 1st gen body.