.
NO current MiniMopar vendor seems to be willing to have their head flow data
published. I wonder why that is?
About the heads whose flow bench test results are provided:
"Ladds S1"
My stock swirl head was ported by Ladd's Porting of Baltimore, Maryland.
Initially I only had them do the bowls and unshroud the valves with a little
chamber work, including making the chambers about 6 cc bigger overall to
approximate the compression ratio you get with a G head. I wanted to get
the swirl of the swirl head, and keep the low end torque hopefully, while
lowering compression to allow very high boost later. My calculations show
that on my block with .030 overbore, the stock head would give about an
8.2 to 1 static compression, while the modified head gives approximately
7.7 to 1 static compression.
For more info, try:
paul@obsessionwithperfection.com
"Ladds S2"
Spring 2001, I had Ladd's Porting open the intake and exhaust runners
in the head to just about gasket size, and I ported the intake manifold
runner mouth to match, as well as further opening the exhaust manifold
ports to the gasket. All enlarging was done only to the roof and sides;
we left the floors essentially untouched.
For more info, try:
paul@obsessionwithperfection.com
"MP Race" - An MP fully ported race head
Comments by Barry Goodall, who had this head tested before further
porting:
The head on my Omni started out as an MP fully ported race head, which
was a G-head with the oversize valves and was what MP referred to as "fully
ported." I then had it ported again as it looked like there was still
needed work (see text below)
"MP Race +":
Comments by Barry Goodall, "MP Race" head as further ported by Total
Flow products in Troy, Michigan
For this porting, the head was optimized for the S60 cam which has
a max of about .500 lift. While the intake only increased a
touch over 6%, the exhaust saw a 20% increase over the MP fully ported
head (both at .500 lift). Notice that there are gains at .300
and .400 lift (especially on the exhaust) where the cam spends a lot more
time than at .500. The head was ported by Total Flow
Products in Troy Michigan.
Also, they told me they could do more with a head that had not been
"screwed up" by MP first. As received from MP, the head had two exhaust
valves that never completely sealed, the valve job was THAT bad.
Since this discovery, my advice to anyone looking for performance from
their cylinder head is to avoid the overpriced MP heads (mine listed for
$1300 when new) and get a good porting job from someone that understands
the requirements of turbocharged heads. They will save money
and get better performance in the long run.
As an aside, Total Flow Products is a premier head service shop that
has a national reputation as one of the best. Just about every
head you see damaged when a Top Fuel car blows an engine is repaired by
Total Flow as the repair is only about 1/2 to 2/3 the cost of replacement.
They repair heads that have the combustion chambers completely burnt or
blown away, amazing stuff they do, they make them like new again.
For more info, try: barryg@ic.net
"Steve M":
Comments by Steve Menegon
I've been dabbling with cylinder head porting on my own as I
like the work. I've wondered if I was screwing up the heads and overcoming
the inadequacies with excess boost or if I was onto something decent.
So, I
ported a cylinder and took it to have it checked. All the work was
done on a Superflo bench and the head has stock T2 valves. I also
unshrouded the valves slightly.
For more info, try: Avomaster@aol.com
"TAFT" (Turbo Airflow Technologies)
"Stock G"
"Swirl"
All these numbers were provided by Nic at TAFT. I had to estimate the
values from a scanned flow chart, so values may well be off by a point
or two in either direction. Also, TAFT appears to be out of business.
