Can I use a non-ported rear iron with a street ported mid and front iron? Is it a bad idea? Is it even possible and still have the engine run properly?

 

Terrible idea. Your port timing will be unbalanced, and your port flow will be as well. Someone like Aaron Cake can probably give you a more in-depth answer.

 

you can probably get it to run with a proper tune. but honestly it's a waste of money to build something like that.

it sounds like you can't afford a proper build, might as well forget it.

 

That sounds like a horrid idea and im sure will cause more Cons then Pros, I suggest getting the rear port matched

 

Why wouldn't you just port the non ported iron, to match the intermediate and front iron???

 

either he wants to be cheap about it.

or

he couldn't afford it (at least right now)

more like the latter, I could be wrong

 

I actually can afford it. I guess I was looking for the most economical way to do it. I have two blown engines and I was just trying to use the parts on hand.

It really was a stupid idea. I bought the irons to do the rebuild right. Whats a couple hundred dollars more when I have like $5000 in this 7 now and no matter how much I throw at it it will never be worth more than $4000.

 

Somebody told me that the intermediate irons intake port was too large.

 

BTW, I'm not a he............ I'm Ashley. That's me on the right.

 

Why don't you just send all three out to be ported all the same?

 

Are you perhaps blowing two engines because you have put into practice ideas like this?

But no, the answer is absolutely no. Each port will have radically different port timings. The ported side will have a much better VE than the non ported and will require a load more fuel. There will never be a way to make the engine run properly.

Either port the new iron to match, or toss out the ported iron and get a stock iron.

You can port it yourself with a Dremel tool and some patience. Trace out a template on the ported iron (use a dirty finger to rub over the lines on some white paper, cut out, then transfer to un-ported iron) and then port to match.

Here's an example of how porting is done:

http://www.youtube.com/watch?v=y1Gy5sVMK3o

 

I would not attempt to port any engine with a high speed Dremel tool, You need good quality bits and adjustable speeds to do the job right.

 

Dremels are adjustable.

 

I wonder how many engines I ported with a Dremel and cheap hardware store bits? 20? It is not the tool, but the person behind it.

Personally I find a Dremel to be far more controllable than a big die grinder. It gets into tighter areas more easily, doesn't need a damn compressor running in the background (for air grinders), and the bits are tiny in a huge variety of shapes.

Watch the video and you'll see how easy porting is with a Dremel. I'll never to back to the die grinder even though I have an awesome Jepson industrial electric die grinder.

Plus, everyone has a Dremel. And what Dremel isn't adjustable?

 

to each their own, i would never go back to a dremel after getting the proper carbine bits and porting rolls for my air die grinder(the main discrepency is that you're using an electric die grinder for your basis).

porting with a dremel = tedious finger numbing back breaking work, would take me about 2 hours for a single iron port.

with an air grinder it takes about 45 minutes for an iron port, saves my fingers and back a bit as well as saves me a chunk of my life.

it's also more difficult to get smoothed out port transitions with a smaller tool. the benefit of it being a smaller tool is also argumentative as you can use an air grinder with a swivel hose end which is as compact as almost any electric dremel is.


as far as mixing irons, yes the answer is a solid no. the main reason is as Aaron mentioned the VE of each chamber will be different which can result in more than simply a poor idle but a blown motor. the main reason is because you have half of the motor working against the other half carrying it's load as well when the engine is not running in sync, in turbo applications this can result in disaster for the motor, in n/a applications it generally results in less performance than a simple stock port motor that is in sync would provide.

 

Actually, only the engine that came in the 7 is the only one that is blown. The other engine is just a POS rebuild. The builder only used 1 apex seal spring per apex seal, left out the injector diffusers and did a really crappy job on the porting. No wonder I could not get it to run properly.
I was told that maybe the porting on the intermediate iron was too large for a stock ecu. Here are a couple of pics. Comments?

 

**** a die grinder, they are much more likely to chatter then a dremel. Dremel all the way

 

Those look huge for primaries. If this isn't going to have a big turbo on it, you might want to get a stock center plate. A factory TII plate has bigger primaries than the N/A plate, but they're still a lot smaller than those.

 

Can I use a stock center iron with the other ported irons, or do you mean to get a stock iron and port it but smaller?

 

Yes, the center iron has the primary ports in it, and the front and rear irons have the secondary ports. When you're enlarging your intake ports, you want the secondaries to be bigger than the primaries, even if only by a little (unless you're doing monstrous ports and then you may want them ALL the same). You want them to match still. You'll want the primary ports to match each other and the secondary ports to match each other.

 

That iron is junk. The ports are HUGE for almost any use, and very poorly done. I don't know if they can be fixed because there may not be enough room to grind.

Best bet is to source a new centre iron.

I'd say to leave the primary ports almost stock. Actually, if you watch my video, that's the primary port I would recommend for most street use.

 

you can go a bit larger on the primary ports actually but the problem he is likely seeing is that the port opening timing has been retarded which will affect idle quality at almost no noticable gains. i dislike people who port the opening like that, it doesn't flow any more air, it actually disrupts it more throughout the duration of the open time.

 

looks like someone with parkinsons did it if you look closely

 

The 2nd picture looks like complete ***.