What would you say the average lifespan of a pp is? Is it less than a bridgeport?

 

Should be better than a bridgeport -- no bridge to crack!

 

yes but then you have the seal around the intake tube and the water jacket to worry about, but like you said its probably higher than a bridgey

 

oh yeah, right, forgot about that Although I'd imagine that if that failed you could just re-epoxy (?) it on a rebuild, vs. having to buy a new iron for a cracked bridge and doing all the porting again (?)

 

Exactly.

 

I have a friend that had 2 of them. He delivered pizzas in both of them. I think he had around 20-30k mi on the latest one when he sold it, and it still ran like a scalded dog. I think since the exhaust ports are already peripheral, there isn't any different load on the seals with a peripheral intake port. The 10.5k redline is a little hard on things sometimes, but if it's built properly they work great. I personally prefer big turbos, but nothing stirrs my blood like that BRAAAP BRAAAP BRAAP and the smell of Klotz first thing in the morning. Oh, and it got around 9mpg or so.

 

9mpg, not to shabby

 

So don't rev it that high.

Hell CJ reported 20mpg highway with his p'port... that's good enough for me! I've had boingers making less power get worse mileage

 

Don't rev it that high?? What's the fun in that? 20 MPG... WOW! I can barely hit 20mpg in a stock port motor.

 

What's the fun in that?

I dunno... I am starting to prefer engines that you don't wind the **** out of. Rotating inertia goes up with the square of RPM, meaning it gets progressively harder to accelerate rotating mass as it spins up faster. And steady state power may be nice but how the engine can accelerate determines how the car accelerates, and accelerating the car is what the engine is for. Unless you prefer racing dynos instead of cars.

 

That is what the term 'Dyno Queen' was invented for!
I've been seeing a lot of those lately from certain individuals on the dyno!

crispeed
87 RX-7 TII
9.204@150.47mph
2600lbs
un-tubbed

 

A well built peripheral engine should see around 50k miles, before the carbon apex seals start getting to narrow. Not to short, but narrow. Now, I've never dealt with the hurley apex seals, or ceramics, only the carbons. Hope this helps, CJ

 

keep in mind, these are street driven miles. Not race track miles. CJ

 

alright, ive been following the 2 pport threads in here for a while and i have a question

it seems all pports make there power way up high and have very little low end due to the intake being very advanced. Do you have to put the port so high? couldnt it be put in lower, somewhat closer to where the stock ports. Would doing this negate the purpose of the pport?

 

pport makes more torque than bridge port at the same rpm.

 

Probably get alot more overlap. And a peripheral engine is bad enough in the first place! CJ

 

Theory:
you would think that because the peripheral port is generating more power than the bridge port that there would be more stress on the parts and therefore have a shorter life span.....

 

Yeah, but the housing cracking is what you really have to worry about on a bridgeport.

 

a bridgeported housing cracks because of what usualy?

increased amount of force because of the higher HP output?

More fragial to heat cycling on the "bridge"

or what?

would cryotreating the housings increase there life?

-Jacob

 

Peripheral engines can be quit drivable,depending on the location and size of the ports,if you look at Yaw`s peripheral,it wouldnt be as rough.Proper clearancing,carbon seals,and a balanced rotating assembly would help with the high rpms invloved.Example : Mazda Factory peripheral 12A housings were used,carbon seals,and 51IDA.It idels at 1200rpm,and starts making hp at 4000rpm.Balancing really does improve lifespan.I have seen 125000miles on a daily driven streetport 12A,very frequently taken to 8500+.

 

oi vey, so pp is better in every respect to bport for a street/occasional track car?

Every respect, except initial cost of course

 

PP would be kinda stupid for a street car. Not to mention the nasty noise it makes. I could never stand that.

Turbos all the way.

 

NASTY NOISE IS MAKES?!?!?!!? it's the most enjoyable noise ever!

bUhr buHR bUhr BuHR bUhR **** i'm down for some peripheral port! ...maybe in two years

there is some street driven peripheral port in pR, so i don't think it's that stupid.

 

I don't know how many of you remember Vigil Ward's R100 way back when in So Cal. Before it had the top chopped and a full tub job, he ran around all of LA county with a 13B P-Port for friggin' years. Big *** supertrapp on the back to quiet the ***** down....passed me a couple times at around 10,500!! Personally I'd love one....use 2 turboII 2 1/2" Presilencers and a 3 1/2" muffler at the end....that would bring some of the torque lower and make it livable noisewise. Uncork it at the track for the top end.

 

"Not to mention the nasty noise it makes. I could never stand that."

Oh my word....cant believe i read that !!

I love Perripheral Ports....they just rock!The mpg is the only thing keeping me from driving one....

Seeing those pipes going into the Rotor housing..mmmmmm...brap-brap-brap-brap...