- Joined
- May 26, 2001
If the EGR passages in the iron heads were filled, Papa Lou would ban me from California!
For those fortunate and do not have to deal with those restrictions, I do have a set of fresh Champion iron heads available.
Ported Iron Head Flow - Good or Bad?
- Thread starter Nick Micale
- Start date
If the EGR passages in the iron heads were filled, Papa Lou would ban me from California!
For those fortunate and do not have to deal with those restrictions, I do have a set of fresh Champion iron heads available.
Pierre
New Member
- Joined
- Sep 19, 2019
nick do you do porting and polishing ? or just sale heads ready to go?
- Joined
- Jun 9, 2013
This post is from 2016
TIMINATOR
Well-Known Member
- Joined
- Jan 26, 2020
I know this is an old post, but let me offer a few insights on the subject.
Even an expert porter has difficulty replicating someone else's port.
If they want to have their port work outflow someone else's, either consciously or unconsciously, they won't do their best to replicate what someone else has done. That's only one reason why CNC scanners and machining centers exist.
Small nuances in ports may have much larger effects than apparent, especially if the original porter is more knowlegable than the "replicator."
If you want to KNOW what someone else's head can do, rather than guess, buy his product and measure it on the same flowbench as your work, under the same conditions.
That being said with no malice intended, let's move on to "trends."
#1. intake porting gains are more important to horsepower production than exhaust port gains, more so in unboosted apps, but still a true statement.
#2. The valve is at max lift only once per operation. The valve is at low and midrange positions twice per operation.
#3. The valve can never flow more at any lift than it's radial distance from its outer edge to the chamber or cylinder at that point. This is called shrouding. Unshrouding the valve to the chamber helps the flow everywhere in its lift range above the shrouding distance.
#4. Proper porting assumes the port does not end at the valve seat, but extends past the valve head into the cylinder.
#5. At what depression in inches and temperature were the flow #s generated at?
#6. What cylinder bore size was the head flowed on? Standard? .060" over? Stage II?
#7. What valves were used? Stock, oversize, swirl polished, undercut stem? Back cut? Other tricks that I'm not gonna mention?
Now you can make more sense of flow chart numbers, but only if you have ALL of the information.
TIMINATOR
Even an expert porter has difficulty replicating someone else's port.
If they want to have their port work outflow someone else's, either consciously or unconsciously, they won't do their best to replicate what someone else has done. That's only one reason why CNC scanners and machining centers exist.
Small nuances in ports may have much larger effects than apparent, especially if the original porter is more knowlegable than the "replicator."
If you want to KNOW what someone else's head can do, rather than guess, buy his product and measure it on the same flowbench as your work, under the same conditions.
That being said with no malice intended, let's move on to "trends."
#1. intake porting gains are more important to horsepower production than exhaust port gains, more so in unboosted apps, but still a true statement.
#2. The valve is at max lift only once per operation. The valve is at low and midrange positions twice per operation.
#3. The valve can never flow more at any lift than it's radial distance from its outer edge to the chamber or cylinder at that point. This is called shrouding. Unshrouding the valve to the chamber helps the flow everywhere in its lift range above the shrouding distance.
#4. Proper porting assumes the port does not end at the valve seat, but extends past the valve head into the cylinder.
#5. At what depression in inches and temperature were the flow #s generated at?
#6. What cylinder bore size was the head flowed on? Standard? .060" over? Stage II?
#7. What valves were used? Stock, oversize, swirl polished, undercut stem? Back cut? Other tricks that I'm not gonna mention?
Now you can make more sense of flow chart numbers, but only if you have ALL of the information.
TIMINATOR
Pierre
New Member
- Joined
- Sep 19, 2019
Price and location pleaseIf the EGR passages in the iron heads were filled, Papa Lou would ban me from California!
For those fortunate and do not have to deal with those restrictions, I do have a set of fresh Champion iron heads available.
- Joined
- Jun 9, 2013
Pierre are you following this the post your reading from Nick is from 2016 he’s not on the board anymore as he has fallen ill.
- Joined
- Sep 24, 2010
The unfortunate part of all this, is Nick has fogotten more than most of us will ever know about these cool assed cars.
He has a couple of guys still running Arizona GN, but his knowledge and insights are, and will be missed by all of us.
I just hope his final days are enjoyed with Terri, his kids, and those who know and love him.
He has a couple of guys still running Arizona GN, but his knowledge and insights are, and will be missed by all of us.
I just hope his final days are enjoyed with Terri, his kids, and those who know and love him.
- Joined
- Jun 9, 2013
Agreed, I never met him or had any business dealings with him I am in N.Y. but his Tech Posts over the years where excellent.
