Hey guys,

Being the cheap poor student i am, I made a copy of the RB porting template, and i'm confident it should work well. Heres how i did it. I got a pic off the net of the RB template over top of a stock port. The original picture i used was taken directly over top of the port, to avoid any distortion. Next i used photoshop to crop out only the stock port from the picture, so that the boarder of the new image is exactly on the boarders of the stock port. I then measured the width of an actual stock port on one of my irons with some dial calipers. Photoshop measured the width of the port from the picture to be 0.407 inches, and the width of my actual stock port is 1.643 inches. So dividing these numbers gives me a multiplication factor of 4.036. Next all I did was revert to the original picture of the port and template, and multiplied the entire width of the image by 4.036, and printed it off with my laser printer. In cutting out the stock port from the print, I found it matches up perfectly with my actual stock port. This leads me to believe that i have a fairly accurate representation of the surrounding template as well. And as far as positioning is concerned, I don't think it will be an issue becuase you just have to line the inside of the port with the inside of the template. I'm sure there is a small margin of distortion using this method, but i'm just looking for a basic guidline for porting. One question i have though, are the stock intake ports on all North American 12a irons the same?

Tell me what you think, or should i just bite the bullet and pay 70 dollars for a template.

Thanks, Matt

 

Yes; you are breaking copyright after they have put a lot of work into research.

Have you also thought that they may be aware of some one trying to steal their product, so the illustration may not be the real one? It would be poetic justice if you grind a port that shape and it does not work.

 

All of you efforts will do you no good because the template is indexed and positioned by the 2 dowel pins. You don't have to be off by much to lose the oil control seal, among other things. I thought the templates were only 45 bucks anyway. Granted, RB, over the years, have more than made thier money back on the cost of developing the templates, but that is what a business is for, profit.

In the long run, it is cheaper to buy the template. An error can cost you an entire rebuild and new irons.

 

I think if you design the template you made by just looking at one over a computer can be a lil riskey. To think about it, intel copies the amd processors and then reverse engineers them. Basically if you did just copy it out-right and made some adjustments to it to make it a better template then you should be good; however, I think you need some kind of legal agreement, I am not sure how that works out thought. g/l with ya porting job let us know how it goes.

 

Fwiw, AMD reverse engineered the 386 Intel processor. They were on the ropes at the time and had they not succeded, and beat Intel in court, we would probably be running overpriced, slow Intel chips. Once AMD became viable and reliable, processor speed developement increased rapidly. IBM was the other main competitor at the time, but they were too big, stubborn and proprietary to meet the new rapid developement and demand landscape.

If one really wants to get serious about porting, and port developement, spend some time in the 'Engine building and porting" section over at NoPistons. You will learn more over there than you will probably ever be able to use, unless you start building professionaly.

 

but if i align the copied port template with the inside of the stock port how can i port into the oil control seal? I'll only be porting "up and out" Like the template sugests. The picture wasn't taken from the RB website, it is a picture from an actual rebuild. I think it'll work, and at this point i'm not very concerned with "copyright infringement"

 

heck why not try it out.

 

^^ I agree with you man. You used thier idea and worked everything else out yourself. You did your own calcs and everything. No infringment there.

IDK about cutting into the oil seals, but if it works out for you - I'll be needing a copy of your temps!

 

^ The only calculations he did were to figure out how to copy the port, not to change the characteristics of the port.

 

...copyright infringement...i guess none of you guys download music on the internet then?

 

If i'm not mistaken the mazdatrix template is the exact same as the RB template. Its a standard street port, I won't have any sympathy for RB at all on this matter.

 

I can't see them taking you to task over a very old template you copied off an online picture. Hell is there any proof it is actually a RB template guide...deny everything and demand proof.

 

The Mazdatrix template is only the RB template because they resell RB stuff. Like the exhaust systems, etc.... They're RB Resellers.

Jon

 

it looks good to me send me a copy of it and i'll find out if it works i got a few irons that need porting ....

 

You could do it without remplates anyway. Look in the porting section on nopistons. If you want to verify that your port template is safe, use the plexiglass method they talk about over there.

 

The plexi-glass worked great when I did the bp. Not only did it show me the clearances, I also understood port timing and overlap much better.