Difference between s5 and s4 rotor housings/rotors?
07-26-10, 11:05 PM
#26
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If you are trying to build a mostly S5 engine with S4 rotor housings, that will work just fine. If you use the S5 front cover, you need to use the S5 front hub and the S5 pulleys for the ignition timing marks to be in the right spot. The location of the plugs in the housings is a non-issue for a mostly stock motor. I'm pretty sure my last motor was using 1 S4 rotor housing and 1 S5 housing.
07-27-10, 09:19 AM
#27
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If you are trying to build a mostly S5 engine with S4 rotor housings, that will work just fine. If you use the S5 front cover, you need to use the S5 front hub and the S5 pulleys for the ignition timing marks to be in the right spot. The location of the plugs in the housings is a non-issue for a mostly stock motor. I'm pretty sure my last motor was using 1 S4 rotor housing and 1 S5 housing.
Can you use a s5 eccentric shaft with s4 rotors?
07-27-10, 11:28 AM
#30
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S5 and S6 rotor are the same with the only difference being some upgrades on the spark plugs area(coolant passages)TDC is TDC we all know that buddy but if you use the s5 housings with a s4 hub your timing wont be perfect,the hub size is different between series and the timing mark is in a different spot cause of the different spark plug locations.
TDC has squat to do with the location of sparkplug holes.
07-27-10, 12:32 PM
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So if I have s4 rotors, housing, and irons but use my s5 hub, shaft, pulley; The timing won't be off enough to cause the car to not run/run bad.
07-23-11, 03:42 PM
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bull fing **** i have proof of this. i built my motor with one s4 an one s5 housing. using a s4 front hub assemblys4 cas gear. I had it tuned off a megasquirt. It doesnt matter at idle but once u start getting higher in rpm the spark will become unbalanced. causing the s4 rotor housing to fire at the right time as the s5 housing will try to spark early at the normal s4. the plugs are up atleast 1/4inch up from s4. I blew out my motor cause if detination at high rpm due to having an UNBLANCED spark. if they are 5 degrees of difference or what ever at 13psi at 7500 10degrees of spark one will be 10 s4 the other wil be 15 s5. to me this matters
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