is a ported motor less reliable?
 

i am getting a street ported motor from either pettit or pineapple for my fd very soon and was considering getting one for a fc as a daily driver. how much reliability do you sacrafice when getting a port. Also if anybody has opinions or anything at all to say about pettit please let me know, kuzz i havent heard sh*t about pettit on this forum... thanx

When you say reliability, do you mean driveability? If the engine is put back together properly, and tuned properly, it will start and run just as reliably as before. The only difference is that the port will open sooner and close later, allowing more fuel to go into the rotor, meaning there will be a more powerful combustion.

As for driveablility, a street port is not so powerful that you won't be able to restrain the car in stop and go traffic. Its not going to be taking the 1/4 mile in 4.7 seconds like a top fuel dragster, so every day driving will not be compromised.

From what I understand it wont be any less reliable, however it may not last as long. Based one what I've been told (and do correct me if I've been misinformed), by taking away metal the actual structure becomes weaker and longevity is sacrificed. I could be wrong of course, but that's just what I've been told.

This is true about a bridge port where the water seal channel is cut away to allow for another fuel port. The modified coolant channel doesn't last as long as a stock motor. I have never heard of any sort of reliability problems with a street ported motor.

The port area is not a load bearing surface, so taking away the metal is not going to weaken the structure. Your just increasing the size of a hole already there. Never heard of a motor failing because the iron plates (where the intake ports are) have structually failed due to porting. Same for the exhaust port. Never heard of a rotor housing fail due to exhaust port being increased to a street port.

yeah, i meant to ask if you sacrafice reliability in how long the motor will last kuzz if there is a much more powerful combustion, arent the apex seals gonna fail sooner?

The combustion stays the same except there is more air there, caused by the ports opening sooner and closing later. It's not the normal engine functions such as combusting that take their toll on apex seals, it's detonation.

Racing Beat set a land speed record in there class with a speed of about 240mph, and Mazda won the 24hr of lemans with a rotary engine. They are capable of producing lots of power and it. Normal combustion will not hurt the apex seals. If you run lean and detonate the air/fuel mixture instead of igniting it, that is what causes damage.

As I understand it porting the intake won't have any effect so long as it doesn't extend into the oil seal (outer or inner) track. Porting the exhaust laterally (on the rotor housings) gives the apex seals less support as they pass over the opening and therefore is somewhat detrimental.

A streetport won't hurt your reliablity.

what kind of mpg do you get on a streetport. and with what kind of turbo and what amount of boost if u answer please.....

:werd:

The only thing that will really hurt your fuel consumption with a streetport is your right foot :D

does anybody know how much HP bump I can get from streetporting

hp will depend on your other mods like cold air intake box, exhaust size and obstructions (like catalytic converters), fuel injector size, boost or no boost, and stuff like that. Nobody has ever posted that they dyno tested the car stock, street ported the motor then dyno tested it again stock with only a street port as a mod so there is no hard number that goes with porting a motor. Obviously a ported motor will increase HP more on a car that has other mods done to it versus a car that is completely stock.

:D but doesn't that hurt everyone's fuel consumption whether modded or not :)