Ported top end: Port Match or bolt it on...

[LGAFF]

Original Post:

Some people have asked about port matching the heads to the intake....obvious solution is the taper the IH runner, but if you plan on port matching in the future, you might go ahead and open it up to 36mm from the get go.....

if so this is what a 36+MM IH look like when mated to a stock head...to me its not that bad...not optimal; but I am guessing you are still picking up over a tapered runner:

[cvette98pacecar]

Port Match it Lee, You will regret your decision if you don't when the engine is complete.

[LGAFF]

Come on guys.....

I am not talking about my car...I am talking about when someone sends out an intake to have it ported and does not have the skill to port match their own heads. Do they go 36mm all the way down or port the top part of the IH and then neck it down to 32mm at the bottom of the IH.

My 92 is port matched...and thats port match just slightly into the head 391rwhp...no tune

my 90 is fully ported into the head...... 441rwhp...thats untuned, small exhaust, stock tb, and I did not play games with dyno....take the air filter off to gain 5 more hp. etc.

I regret ever even posting this thread.......

[USAZR1]

Originally Posted by LGAFF

Come on guys.....

I am not talking about my car...I am talking about when someone sends out an intake to have it ported and does not have the skill to port match their own heads. Do they go 36mm all the way down or port the top part of the IH and then neck it down to 32mm at the bottom of the IH.

My 92 is port matched...and thats port match just slightly into the head 391rwhp...no tune

my 90 is fully ported into the head...... 441rwhp...thats untuned, small exhaust, stock tb, and I did not play games with dyno....take the air filter off to gain 5 more hp. etc.

I regret ever even posting this thread.......

Personally,I find this kind of info very informative,Lee.

[XfireZ51]

Originally Posted by LGAFF

Some people have asked about port matching the heads to the intake....obvious solution is the taper the IH runner, but if you plan on port matching in the future, you might go ahead and open it up to 36mm from the get go.....

if so this is what a 36+MM IH look like when mated to a stock head...to me its not that bad...not optimal; but I am guessing you are still picking up over a tapered runner:

Don't think anyone would argue w the original point Lee is making here.
Some of us can't STAND the idea of leaving A horsepower on the table.
But as an example, Pete and I decided to leave my GVD heads alone on the last upgrade as a compromise. Giving up a bit of flow was worth it for me when considering potential consequence of aggressively porting the head runners.
Thought I could make up for it in some other way.
Too much hp available just from porting the top end, even without a port match,
not to do it IMO. Compromise is in the eye of the beholder.

[Schrade]

Originally Posted by LGAFF

Paul read the post:

This is what I am trying to say:

Option 1)Port to 36mm to bottom of IH, no port match, head primary stays at 32mm
Option 2)Port top of IH to 36mm and taper to 32mm
Option 3)Port to 36mm port match head 36mm primary

What I am saying is.....Option 1 is as good or better than Option2 and option 1 is not that substantially different that option 3.

Conclusion: Even if you are not port matching, I would still open it up to 36mm.....its as good as the taper and depending on the car as good as some produce with a port match. Plus if you decide to port match later...its ready

What I am not saying:
*My porting is great or better because a guy got 37 rwhp
*Point is someone did not port match yet got results similiar to port matching
* That porting a runner 2 inches in would not produce better results; **** if you port the thing down the runner thats alittle more than most people would do port matching.

Holy **** this is my last tech post everybody wants to turn this thing into a pissing match

It's NOT a pissing match.

It's CLARIFICATION!

Even a DEBATE CAN be kept civil. Too few know how tho'...

[Locobob]

I prefer to taper to about 34mm even if the heads might be done later. Reason for this is mainly port skew i.e. the intake and head ports rarely line up just right. By leaving a little material to work with on the injector housings I have a better chance at getting a perfect port match when doing the heads.

[-=Jeff=-]

Originally Posted by LGAFF

Option 1)Port to 36mm to bottom of IH, no port match, head primary stays at 32mm
Option 2)Port top of IH to 36mm and taper to 32mm
Option 3)Port to 36mm port match head 36mm primary

I think there may be people that struggle with this if they want to port, but

1) aren't comfortable doing it
2) are on a limited budget to do this
3) are afraid if they screw up the head on the car this porting joib just got real expensive

I have not ported, have I thought about it. Absolutely. Am I motivated? not really, I have an extra set of IHs (the originals and if I did them or had them done, I think I would start with porting like Locobob suggested and taper to 34mm on the bottom, then leave the heads alone and see how that works for me.

But I am really not in any rush to do that

Lee, I think the info is good.. THANKS

[Schrade]

Originally Posted by LGAFF

Paul read the post:

This is what I am trying to say:

Option 1)Port to 36mm to bottom of IH, no port match, head primary stays at 32mm
Option 2)Port top of IH to 36mm and taper to 32mm
Option 3)Port to 36mm port match head 36mm primary

What I am saying is.....Option 1 is as good or better than Option2 and option 1 is not that substantially different that option 3.

Conclusion: Even if you are not port matching, I would still open it up to 36mm.....its as good as the taper and depending on the car as good as some produce with a port match. Plus if you decide to port match later...its ready

What I am not saying:
*My porting is great or better because a guy got 37 rwhp
*Point is someone did not port match yet got results similiar to port matching
* That porting a runner 2 inches in would not produce better results; **** if you port the thing down the runner thats alittle more than most people would do port matching.

Holy **** this is my last tech post everybody wants to turn this thing into a pissing match

That goes against logic there MrG...

Sorry you choose to not post further on it tho' (I don't see where anyone ELSE was trying to make a 'pissing contest' out of the DISCUSSION), but I hope someone else will try to explain this, without getting upset, what seems to go against logic.

Fortunately, NO one knows it all, and EVERYone still can learn a thing or 2, IF THEY WANT:

Originally Posted by Schrade

... and a little wisdom while I'm at it here.

I'm into learning, and learning how my Z works (or is supposed to work anyway ). That might be evident when you see how I break stuff down, shoot snappics, post them and write stuff out, clean, and re-assemble (front fascia, Cruise Module, TPS testing, etc.). Kinda' like Dynomite's 'Solutions' threads... Good stuff there Cliff

Knowledge is good.

Reading tech posts is good info too. When opposing posts show up and get resolved, that's another tech tidbit that you can add to FSM info. IF they get resolved, that is...

The Bible says in Proverbs that "Iron sharpens iron". When done right, both edges are sharper. When done right, you're gonna' get heat, and sparks, but both edges get sharpened - IF DONE RIGHT. When 2 Bible scholars debate doctrine, using other Bible verses as reference, both know MORE. They might not agree, but each knows MORE.

But if you just bang together a couple of edges, both edges just get dinged up (and iron 'dings' actually integrate into the iron's molecular structure, BELOW THE SURFACE). You stop sharpening them, they just get rusty. You have to start over again, clean off the rust, sharpen out the ding, and then go deeper even, to get below the dinged molecular latticework.

When 2 Z experts debate tech info, CORRECTLY, I know more. And there IS a bible for each year's Z...

If I remember correctly, some forum bosses had a difference of opinion about BG '13. The thread just got wiped. No resolution (and that dinged molecular latticework is still there).

Maybe let US decide who's right, and who's wrong. And who can admit it. THAT takes a REAL man.

This time, same outcome. No one learned anything about the Z. Too bad... Maybe try it again, and do it RIGHT.

Then we all know the Z better...

WISE old sage OUT.......................................


ed.:
I don't see a 'Site Feedback' sub-forum, so I posted here. Hope it ain't out of order (or no nerves are touched).

[batchman]

Originally Posted by LGAFF

Do they go 36mm all the way down or port the top part of the IH and then neck it down to 32mm at the bottom of the IH.

Originally Posted by LGAFF

Option 2)Port top of IH to 36mm and taper to 32mm

Sincerely hoping this thread has not scared Lee off, I have a question.

My racing rules limit me to going 1" into the head ports, intake or exhaust. On the other hand if I'm going to crack open the thing (or the wallet), I want to make sure I don't leave anything on the table. After all, this is [strikethrough]war[/strikethrough] racing.

To my eye, choices appear to be A) porting IH with <=4deg taper to match the stock head or B) porting to the extent that <=4deg taper can happen within the top inch of the head.

Looking at the implements of destruction I honestly didn't think one could taper like "A" in the IH. On the other hand I figured using the 1" into the head would be the way to make sure the ports register properly between the IH and the head.

If I think between the lines a little bit it sounds like Lee's answer to my dilemma would be let the head ridge stay, but knowing myself I'd take that to mean stick with tapering in the IH.

Maybe the truth lies in the middle, taper the IH from 36 to 33 then use the last mm in that top inch of the head to be sure to align the ports?

I am still on the fence about the secondaries. Once in a while I need to leave the car with a mechanic and knowing human nature that's a great time to keep the power key in the pocket so to speak. It sounds like there's nothing to be gained there at the head other than simplification, which I do confess I like a lot...

Thanks,
- Jeff