resjsu

Hello,
Im new to the forum and I hope I dont get into trouble for posting here and what not. I have an 84 rx7 gsl with a bone stock engine. Everything is pretty much stock cept for a power pulse muffler.
I obviously want to get more power out of it, not a whole lot but a decent amount. Ive been reading around and it seems like street porting is the way to go. I have not been able to find out exactly what it does in terms of engine longevity or life span. Is there anything I should do before I get it street ported? With a bonestock engine Can i even get it streetported or would I have to get it ready for porting? About how much HP can be expected from a mild street port?

Any suggestions would be greatly appreciated. Again sorry if I posted in worng location or something liekt hat. Thanks for looking, have a good day.


Aure

resjsu

Sorry but I have to add that the engine was rebuilt and has 15,000 miles on it.

drugblock12a

iTrader: (7)

street porting isn't goint to do your engine any good if it can't breathe. a good carb and exhaust is a must. there is no better investment than a racing beat header (opinion). then i would work on the ignition, but thats me. welcome and i hope you learn some thing here, i have.

and no i don't use capital letters......so what.

resjsu

Excelent. BUt im a little confuse don igniton? how exactly does help with more power? dont laugh, i know i know but im lost. Ha.

resjsu

So say I have like 1000 dollars right now.... In what order would you begin this.... exhaust...carb then port?

diabolical1

iTrader: (3)

a streetport can really wake up your motor. you'll need improvements on the intake and exhaust sides - as stated, but all in all i think you'll be pleased as long as you keep realistic expectations.

drugblock12a

iTrader: (7)

i'm not the smartest guy either, but a strong spark makes for good combustion and a smoother idle. and a smoother idle is something that you might appreciate more than you think. some poeple also say it makes starting 7's a little easier, i know i have noticed a differance.

there are alot of ways to do this look it up in the faq's.

most people would just tell you to use the search. it does work, there is alot of info floating around here.

diabolical1

iTrader: (3)

get a full exhaust system, as opposed to just a muffler. whenever you have some more money together and can afford some downtime for the car, then have the motor ported. there is a thread started by the user Mazderati, i think it's archived, it should give you some helpful tips on building a reliable motor. do the carb and ignition after you've broken in the streetport and start tuning.

resjsu

great sounds good.... i think i have everything ill need for now. thanks a lot you guys.

resjsu

sorry last one..... with my engine stock a street port will not hut at all right? I might not feel the full effect but it will not damage other components in my car right?

MattG

iTrader: (2)

No I have a streetport engine with all stock parts as of this second, I got the engine but ran out of money to upgrade everything else, but thats how its goes.

But If you look in my garage there is a 48DHLA Dellorto, New Fuel Pump, FPR, 2GCDFIS W/TT and a Full Racing Beat Streetport exhaust system!!!!! I start work today!!!! WOOOOT

Directfreak

iTrader: (2)

Stock Port with Bolt Ons > Street Port with No Bolt-Ons.

Street porting is generally 10-15% power increase only. You can get up to a 25-30% increase with your exhaust alone. Obviously both mods are better.

DO NOT DO A STREET PORT AT THIS TIME.

You have a fresh engine rebuild. In case you aren't aware, you would have to
take your engine apart and rebuild it again, in order to port it.

Spend your money on all the bolt ons first, and you will get significant horsepower increases - more than porting alone.

1) Racing Beat Exhaust system
2) Ignition Upgrade
3) Carburator Upgrade
4) Maybe Gears..

Porting should be done last, OR if you have to take your engine apart for some other reason (like you blew a seal or something of that nature).


Good Luck.

resjsu

Perfect exactly what i needed to know thank you.

Rx7carl

stilettoman

iTrader: (1)

Directfreak is right on. I am no expert, but I have friends who are, and they all say the same thing that Racing Beat says - if you are only going to make one change to a stock motor, install a good header, even with the rest of the exhaust stock. A Racing Beat header is a very good choice and the price is right.

If for any reason you ever have to remove the engine or transmission, then consider a light flywheel, preferably aluminum. This will not give you more power, and it will not help you at freeway speeds, but in the first two gears, you will really feel the difference. For some reason, a very light flywheel does not seem to adversely affect driveability the way it does with a piston engine, although the silky smooth idle will go away. I had a 12 pound RB aluminum flywheel on a 13b that I put in a GLC, and I towed my ski boat with it for several seasons, with no driveability issues at all. I have 20 years experience with both the header and the light flywheel in several rotary powered cars, and they really do make a difference.

As for longevity, moderate porting will not adversely affect engine life in itself. The primary effect of the porting is to allow better breathing, which allows you to rev to higher rpm, thus making more horsepower. But if you are porting it and expect to get more power, then presumably you will be running it harder than the average housewife. That will definitely affect the engine life. Race cars don't generally run 150,000 miles between overhauls.

resjsu

Sounds good. But i have .... maybe what u might call an elementary question.....

Alright so the rotor basically sucks the air intot he chamber right? If my engine is a 1.1 liter engine then each rotor sucks in .55 Liters right? Regardless of the actual amount...... If they are designed to upll in that much air/fuel mixture.... how does porting help if the engine is only able to suck in the same amount of fuel? Unless You have a forced air indtuction system, i just can't get how street porting alone (even with an exhaust will work) ..... Thanks for answering my previous questions and this one also.