Intake / airflow velocity
This is something you don't really care about on the really upper high end, but it kills a lot of power down low.
Intake velocity is very important for stock and streeted vehicles.
This is the reason for VDI and Honda's VTEC.


-Ted

 

So your saying that it actually does improve top end ? Exactly why poeple do it!

 

it improves top end only if the whole setup works, just higging out the port in one spot will just hurt airflow. this is not the way to do it on something that gets driven on the street a lot

 

Yah I'm not worried with low end much, I'm working on more peak/top end power and making power past redline. But for it to be complete I need to finish other things like standalone, custom manifold and throttle body setup, etc.

I daily drive my car with porting like that, no sleeves or actuators or anyting, aluminum flywheel, solid engine/tranny mounts, bla bla... "Streetability" doesn't seem to bother me I guess.

 

yea i find the car to be streetable with this port. .it's not bad at all. almost stockish feeling, a little less low end but not much. you all saw the graph, it's not to bad. But yea that's the kind of port i have. .oh well, live and learn it still pulls pretty hard and i will be getting a standalone sometime, and making a custom intake mani, so i should be able to bring this port to life a bit more. we'll see. i may also be going over to boost with engine in the future. we'll see, it should take well to boost it would seem with a port like that. thanks for all the input
Dom

 

nice

 

Most shops consider a pull as one cycle on the dyno and a run as 3 cycles. Any good racing shop is going to do testing in runs because the third pull will almost always make more power than the first and second. This comes from fluids still comming up to temp (even after warm up), blowing carbon out of the engine, etc.... Then they will tweak something and do another run of 3 passes.

Out of 3 weeks of dyno testing at school the only time we had a weaker number the 3 pull than the first was if there was operator error.

 

Wow, you're losing a lot of torque in the upper range. I'd guess air fuel ratios are off; doing porting and airflow mods to stock ECU cars poses a situation where some mean potential can be unleased with an aftermarket ems. Megasquirt in fuel mode only (stock ecu still running ignition) made a real difference in my car's case in the midrange where it was too lean. You might be able to lean out the top range and get some torque back.

 

haha oh man back from the dead. Yea i had planned on megasquirting this car but sold it instead. I now own an 87 t2 but thanks for all the input guys. In the future i would never port a car like this again, not unless there was a huge turbo bolted upto it or internals that could handle 10k rpms. It's not a very practical port and didn't make **** for power as you guys could see. I feel like i could have made more power on a fesh stock port engine. Oh well live and learn, then go boost :-P J/K I love n/a's but this turbo stuff is pretty cool too. haha
Dom

 

Dom, at least you learned something. I feel your last post should be forever etched in stone where everyone can see it and see that this style of porting in fact doesn't work well for street use. People ask about this same port style all the time and the same people keep building them for others. Prime example how bigger isn't always better and how if you aren't testing you are guessing. You've got a much more fun and drivable engine now anyways. I'll bet a TII is way more fun than that engine was.

 

Yea i definetly learned something. I would also never pay anyone to rebuild and engine for me agian. Not because of bad quality or anything but it's just so simple! unless I had absolutly no time and had a **** load of money to spend i owuld do it my self no doubt. And also, this port is definetly drivable on the street that's not what i was saying. . I drove this around with a 6puck clutch just fine. I just was really disapointed with the power output of this engine. Like others have said this port could be made to work if done correctly, or witha huge turbo but there are other ports out there that will make a ton more power, have a broader powerband, and just be better all around motors. And yes the T2 is a ton more fun. Boy's torque is good! It may not have a ton of really low end torque but **** i'm liking the darkside.

 

those numbers aren't that bad.......its very hard to make alot of power n/a.i only know one person who makes good power with n/a engines.......good thing he is a friend

 

kahren is a cheese eater

 

who? that guy is an ahole

 

get a stand alone and you should be fine. stock ports can make upwards of almost 175 - 180rwhp on stock ecu's... but the ecu can actually control that. your porting ruins what the ecu understands. so get that megasquirt asap.

 

I'll say it one more time. . lol I don't have this car anymore. It was sold along time ago. I now have a 87 T2. And i do have a megasquirt now:-p