S4 VS S5: does engine look different?
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Fixentofixit
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S4 VS S5: does engine look different?
Is there a way to tell a S4 NA engine from a S5 engine just by looking in the engine bay. The engine in my 91 is not original and I'd like to make sure I'm dealing with the later engine before I start to modify.
TODD
TODD
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the s4 and s5 look alot different.
At least between my two rx7s', they do.
One sure fire way to tell the difference between the 91 s5 N/A engine block (that I just replaced with an s4 87 N/A) is to look at the actuators that hook up to the lower intake manidold.
The 87 N/A's have these piddly two actuators.
The 91 N/A's have big beefy hulk actuators.
Hulk smash!
That's one way, eh?
Oh and btw, DC350.... Its good to see that you haven't killed yourself with some stupid motorcycle.
At least between my two rx7s', they do.
One sure fire way to tell the difference between the 91 s5 N/A engine block (that I just replaced with an s4 87 N/A) is to look at the actuators that hook up to the lower intake manidold.
The 87 N/A's have these piddly two actuators.
The 91 N/A's have big beefy hulk actuators.
Hulk smash!
That's one way, eh?
Oh and btw, DC350.... Its good to see that you haven't killed yourself with some stupid motorcycle.
Last edited by Templeswain; 10-17-03 at 01:32 AM.
#6
I wish I was driving!
Originally posted by Templeswain
The 87 N/A's have these piddly two actuators.
The 91 N/A's have big beefy hulk actuators.
The 87 N/A's have these piddly two actuators.
The 91 N/A's have big beefy hulk actuators.
This is an easy one: The water outlet neck on the engine is aluminum with a rad cap on it on S4's, and black plastic on S5's with no rad cap. Although it is possible to put on the S4 pump assembly on the s5 engine, and vice-versa, it is unlikely.
The S4 UIM says 13B injection in black painted letters on the top.
There is a pair of holes above the top (trailing) spark plugs on the S5 engines. (In turbo models, this is where the knock sensor was moved to). If the block is smooth, it has S4 rotor housings.
Those are the easiest ones to spot... I can go on if needed.
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Fixentofixit
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Thanks for the info guys. I bought my 91 NA as an everyday/work car. My weekend toy is a Porsche 911SC. I told myself I would not modify the RX-7 -- just use it for work and errands. As you probably guessed, that idea lasted about a week. Now I have two toys to tinker with in my spare time. Oh, by the way, I do have the later S5 engine. It just doesn't seem to run as strong as I expected. I'm ripping the cats off this weekend. Hopefully, I'll get a difference -- at least at the topend, where it doesn't pull well.
TODD
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