Peripheral ports

[Grant Monkhouse]

How many people are running PP\'s? Turbo or na? as I have only come across a few.
1, kevs 20b PP TT( 2x gt40\'s)
2, steve g 13b PP gt42(now sold)
3, chaz\'s rx3 race car 13b PP carb\'d
4, matts 20b PP rx7 built by pip

I wonder why many other people don\'t run them? Correct me if I\'m wrong but there isn\'t any of the guys in the hks drag series running PP\'s?

Chris impey is running semi PP\'s but that doesn\'t count as a PP in my eyes.

As I have gone from running standard ports to a large street port in my FD,, and now a full bridge going in the rx4, the next step for me once I have had fun with the rx4 is to go for either a monster port (highly unlikely as they shake cars to bits) or a PP. With a huge turbo.

What I\'m thinking now is that people will say engine life is reduced because off the PP\'s but how many miles a year do we actually do in our rotaries? Not many sothat can\'t be the issue why not many people have them?

[MaLicE]

matt isn\'t pp any more, he has gone side port i think?? said that the fuel was stupid on it.

[- Fezcat -]

I always thought PP was bloody expensive?

I think Mir seems to have swapped engines with Matt?

[Lacey]

What\'s the standard 13b like being PP\'d and N/A as well? From how I was explained it, the porting (ranging from smallest port upgrade to peripheral at the top?) change the air flow and air volume for the cycle, which changes the power curve and lowers the low-band power in exchange of upping the high-band power a fair bit. Is that right? If so, would that not make an N/A massively underpowered and considerably slow in the low-down rev range?

[Grant Monkhouse]

A 13b PP would be anything up to 320fwhp depending on the size of the port, especially with carls PP\'s. The power band is move further up the rev range, 6-10,000 rpm but that doesn\'t mean it has zero power below that.

However stick a turbo on that and you will get more power across the range and not even have to rev it to 10,000 thus reducing the wear on the engine.

I think I was one of the lucky ones to ride in steves car when he had the PP turbo in it, all I can say is there was NO lag on a gt42 turbo!!!

[Grant Monkhouse]

I always thought PP was bloody expensive?

I think Mir seems to have swapped engines with Matt?

I can\'t see it being that much more expensive than anythin else as the engine, in essence is simpler with far less bits bolted too it??

[Lacey]

I was just wondering about the practicality and the power delivery curve on PP\'ing an N/A engine and how dramatically it would reduce the low-band power in comparison with stock, and how much the upper-band gain would be.

[kiwimazda]

The pp rev range comes in very high. Noise is also an issue for race applications. Final drive ratio may have to be altered. All that said, I have sink pp inserts on the bench along with a good high compression 6 port awaiting the conversion.

[Lacey]

All that said, I have sink pp inserts on the bench along with a good high compression 6 port awaiting the conversion.

Oooooooooh, you\'ll really have to let me know how that goes!! I\'ve been curious about going along that route for a while since the EGI will be coming up to \'rebuild due\' in the next X000 miles, and was debating getting some work on the housings/plates done while it\'s apart, and getting it ported, probably PP\'d, then starting up a savings fund for a Rotrex or something similar. once I\'m used to the power of it after the build.

Trying to be sensible with it, and the EGI is the first RWD car I\'ve owned, so would like to get used to the stock power first and then go up in suitable increments, not just start off at stock and then ramp it up to it\'s limits all in one go and then be scared of driving it in case I screw up.

[Grant Monkhouse]

A rotted supercharger on a PP? Now that would be interesting.

[jackaleks]

the world needs more blown rotaries!
 
 
...i mean, supercharged rotaries.

[Lacey]

Good interesting, or "waiting for it to **** a brick" interesting? :p

[rx7boy]

I can\'t see it being that much more expensive than anythin else as the engine, in essence is simpler with far less bits bolted too it??

He was getting 4mpg on track and 8mpg on the road with the PP setup

Now with the side ported 20b he is getting double that easily. I know that mpg really should not matter in a sports car, but driving too and from events must have have cost a fortune. plus on track it must have been munching fuel.

[Lacey]

He was getting 4mpg on track and 8mpg on the road with the PP setup

I see no problem here! :p

[Ed_RX7]

mine will be ready in a couple of weeks;)...a POWERGAINS PP witha twist!!!!...watch this space!!!:burnout