chamber walls are very thin what really helps is to deck the heads to get rid of the lip

 

this thread is great. I'm trying to learn as much as I can about the process. Eddi, what happened to all the pics?

 

I have no idea why the pictures are not there anymore. Thats really werid. Later tonight ill re link them and see if that solves the problem.

 

I can prove the bold wrong on my flow bench.

 

I love all the advice in porting threads from people who have never had their heads flowed or tested for velocity.

 

I'm starting to think that if I'm not going to pay somebody experienced to do my heads, I should just leave them stock, rather than hack away at them without a solid idea of what to remove

 

OK, and?

 

I agree with blazers question here...

Not all of us will dump large quantities of $$ into iron heads, and to be honest its not hard to get them ported out. Its sorta hard to mess them up. But thats IMO.. Im a budget builder I guess.

 

Your pictures are meaningless to me, if you can't provide factual video then take a hike...

... what was your biggest accomplishment since you opened your shop John, 13 second ebay turbo vehicles lol? We work on Lambo's, Porsche's, GT-R's and Bimmer's now, are you still working on junkyard stuff? Gonna post up someone else's accomplishments to make your point again? Talk to me when you build something worthwhile.

 

13 second turbo cars?? Really? I did that and Ive never worked on a car in my life till about 1 year ago.

But seriously why discourage someone for trying. Christ if he messes up heads I have another set Ill give him for free just because i love to see others learn and be able to work on there projects themselfs.

 

I have no idea what he is working on now, and I could honestly care less. You will find lots of people like that jumping into threads posting up their nonsense, then point towards someone else's car to justify their point. Smoothing and polishing the intake tract has been proven to negatively effect the air/fuel mixture by way of what we refer to as "fuel dropout" through an overly smooth surface, thus the process itself underlining velocity, and the reason why we keep the tract rough after the fuel meets the air to avoid fuel dropout, but smooth just before that because there is no reason to slow the charge beforehand...

Personally, I feel that is the only way someone will ever learn, by trying...

 

the intake tract should never be polished spooth anywere even if its isnt flowing fuel in that section .

when streetlethal said smooth the injector bungs he was dead on, u smooth it by taking the ridge out of the intake, but u still leave the surface roughed up, after porting finishing off the port with a 60-80 grit sanding drum/roll is best

i have proved my port work time and time again, every last set of my heads has needed considerable less boost to run x amount of time compared to others

 

fasteddi did a great job on his with no prior experiance so dont be afaid to give it a go, just take ur time go slowly and post lots of pics and we can help u out along the way

 

I got a pair of heads that project89 ported a while back. They're gathering dust in my closet. Anyone want?

 

You're right, you don't have any idea what I am working on. Sure, I built ebay turbo kits, but these days 90% of our work load is BMW. I am currently build a forged m20, forged s50, swapping an s52 OBDI swap in an e30, just finished an OBD2 swap in an e30, doing an s50 clone swap in a Hamann e36, m52 swap in an e30, just finished a forged build in a 2010 Genesis Coupe 2.0t R-Spec - but none of that has to do with porting heads, and porting iron 660 heads surely have nothing to do with Lambo's, Porsche, Bimmer or GTR's, either.

Whatever you work on, if you know about porting and how air works, you would know what boundary layer is. If you have a rough surface, the air will swirl and act like ball bearings in on itself. I was simply stating you are wrong in your assumption that ports need to be smooth above the injector. In a carb'd situation, yes, you are correct that if the ports are too smooth, fuel will puddle, but aren't we discussing EFI motors?

Do you have a flow bench? I have a Quik Flow flow bench (2 of them actually) and can tell you there is increase in flow if you have the proper texture. Period the end. Even if the flow was/wasn't hurt by polishing them to a shine, you are wasting your time. We polish the exhaust only, to help prevent carbon build up.

 

Ill will add that I DID NOT smooth anything when I ported my heads except the exhaust ports and the chamber faces.

I was tought that don't polish anything after the injectors but also was tought to not polish anything on the air intake side from carb. guys so I just did that to be safe on my build. I heard so many things on what to do and what not to so I just went with the rough in the end. Basically to leave it a little rough to help the swearling mixture.(100 grit on all the intakes is what I used) Also ever read up on the "golf ball effect"?

Who knows if what I did helped the car that much but getting my hands dirty with porting at least opened my eyes to the way air flows through them. Also for how tight those valve guides were.... well Ill just say im sure you all know how pathetic those are from the factory.

Im a total beginner at engine building period and will always fess up to that with no hessitation.

 

Nothing wrong with trying. Everyone starts somewhere, but based on thousands of hours on a flow bench, I can tell you what not to listen to.

For the iron heads, sure there are a lot of basics that work, but when you drastically change the shape, you can hurt flow, but generally when we flow test heads by a company (or individual) that hasn't flowed those particular heads on a bench, then often the flow doesn't increase at all or very little and since the cross sectional area vs. valve coefficient has increased, velocity suffers.

 

You can demand video. I can demand money to make you this video. How much is an education worth to you?

 

And on that note this thread gets locked until I have time to figure out what to do with it and/or people causing trouble in it.