NoPistons -Mazda Rx7 & Rx8 Rotary Forum
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NoPistons -Mazda Rx7 & Rx8 Rotary Forum (https://www.nopistons.com/)
-   2nd Generation Specific (https://www.nopistons.com/2nd-generation-specific-17/)
-   -   Engine Compare: S4 V.s S5 Tii (https://www.nopistons.com/2nd-generation-specific-17/engine-compare-s4-v-s-s5-tii-19978/)

Suds 07-01-2003 03:01 PM
And I think they have longer and larger secondary runners, not sure. I know the third gen UIM has longer secondarys.

drifter 07-02-2003 01:27 AM
Why are you worried about the OMP?

Block it off, use premix. Just keep it plugged into the comp and you'll have no probs.

https://www.nopistons.com/forums/pub...R#>/unsure.png

Racer X 07-02-2003 01:14 PM
Originally Posted by Suds' date='Jul 1 2003, 11:54 AM
Higher comp in the s5 (9.0 to 1 instead of 8.5 to 1) and a stronger rear plate. S4 engines over 400whp like to crack those rear plates. If you plan on going over 400whp get a s5 block.
Or use some bridgeported S5 plates on the S4 block.Then slap a T78 on it and hope like hell you don't pull a vosko. https://www.nopistons.com/forums/pub...IR#>/happy.png


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