Is porting for power a myth?

Any form of normally aspirated power mods.
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Ryan Rotary Performance
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Re: Is porting for power a myth?

Post by Ryan Rotary Performance » Wed Dec 05, 2018 9:31 am

I think this thread concludes that porting does make more power, albeit more difference on a 4 port than a 6 port engine :)

viewtopic.php?f=205&t=78656

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Re: Is porting for power a myth?

Post by ChrisHolmes » Wed Dec 05, 2018 1:50 pm

Less ports = more driveable power!
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Re: Is porting for power a myth?

Post by Ryan Rotary Performance » Wed Dec 05, 2018 2:22 pm

ChrisHolmes wrote:
Wed Dec 05, 2018 1:50 pm
Less ports = more driveable power!
I actually think the 4 Port, once its had our magic, is the better road car, only if coupled with the 6 speed box. We can also put the 4 port engine in the 6 Port Chassis with no issues.

The 6 Port engine on the other hand will make a better track car. (for now)

All this is subject to our 4 Port stage 2 modification which I think will see the 6 port become redundant come rebuild time for many.

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Re: Is porting for power a myth?

Post by warpc0il » Wed Dec 05, 2018 4:41 pm

Many builders choose the 4-port engine as the basis for FI installations.

Turbo or supercharging makes the original intake redundant and pressurisation means that you can flow more than enough air without the extra ports and their complexity. Most also keep the 5-speed 'box because they believe it to be stronger; at least for handling torque if not higher revs.
All replace the rear stationary bearing for the 231-specification part.
Some replace the flywheel and counterweight for 231-spec parts, but that's mainly because you can't get (most of) the performance clutch options in 192-fit.
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Re: Is porting for power a myth?

Post by PeteH » Wed Dec 05, 2018 6:05 pm

The 5 speed box is basically the RX-7 box (I think). Does that mean the 5 speed clutch is also the RX-7 clutch? If so, I don't understand the lack of high performance clutches. You'd have thought there would be some serious clutches out there for the tuned RX-7s...? What am I missing? :-k
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Re: Is porting for power a myth?

Post by warpc0il » Wed Dec 05, 2018 6:16 pm

The clutch has more to do with the engine/flywheel than the gearbox.

This means the Renesis 192 clutch is not the same as the RX7

The 5-speeds boxes are also more different than people think.

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