Inliners International Forums General Discussion Hi Performance has anyone tried a intake port divider plate?

i was thinking a intake divider plate may help me with my motor. everyone knows that a hinderance to the inline chevy 6 is the siamesed intake port. lumps help, but what i am talking about is a plate to use with lumps to split the port into 2 halfs. i am running a turbo so pushing air in is no problem. what i want to achieve is better fuel distribution. i have two injectors aimed down the one port, one on each half. at low speeds one cylinder can tend to rob the fuel charge, i thought a divider may help. what are your thoughts. tom

The port volume is shared. A divider was tried MANY years ago and It has been said that the lump is the better way to go. as to using Both??
me personaly Have not had time to get back on a bench to see how that works out. But just because a bench says Yeah it may work the REAL world or track test would Be a Much better test bed.

On my clifford intake I divided the ports.
I ran .060 aluminum welded down the center of the manifold & extended the .060 past the mateing flange of the manifold roughly 1/2".
So, roughly 1/2" of the aluminum goes into the cylinder head.
I do not have lump ports.
But I made my own lumps that goes to the roof of the intake ports,BTW they did help flow along w/better low end torque.
I never seen anyone make these.
I bet w/the lumps I made(that bolt to the top) along w/the bolt in lumps(that bolts to the bottom of the ports) it should really increase the air velocity.

I would think that Hank's method of running the divider all the way to the plenum would be the only effective way to ensure even distribution of air to each port.

I have some old pictures of a clifford that was cut in half many years ago to divid it there was even a carb plate/spacer that to was divided. But One thing you guys are over looking. Unless you are going to the BACK of the Head port/pocket The
Port/pocket is still being Shared.
I also Have this divider That was made & Used many years ago. I will try and dig them out,
and get some new photos of them and try to get them up on my site over the weekend.

Hank If you have photos of what you have done.I'd be more then happy to add them to my web site If
you don't have a problem with sharing that info
for others to what has been done in the past.

With the lumps top and bottom IT??? may become a issue with the Port Now being to small??
Tom langdon and I have talked about me Making a divider simular to the Boss to mate Back to the top of the head so that the top of the head wouldn't need to be tapped for the pipe plug.
But so far I have not come up with a good way to
get it back into the head with the Lump.It also Makes for a VERY big hole in the center of the
Lump. The only other thought I have had Now would
be to notch out the leading edge of the Lump and
install a Steel sleeve. Freeze it to make for a
Very Very tight fit, But now the other problem
that would come into play in doing it this way
Is there is NO longger a safe spot to drill and
Bolt the lump into the port floor.With Out getting into the water jacket.

Some other photos I have yet to get posted are
those of Taking out the top of the port,to raise
The ports all together. The farther i get with this project the more photos i will have then
I'll start posting them.Untill then i am holding
off and posting those.I'm also making a new plate
for the port floor.Getting the new Intake mount
area seems to be the ruffest/hardest thing of all.
So that I have a good angle to mount and work
with.But in the long run this project should make
for a interesting topic down the road.

Question,
Would one large injector, centered in the intake plenum, be any better than the two individual ones?

Well, with one larger injector per port, you will lose a bit of streetable manners.
One large injector will not give you better gas milage, maybe worse?
Two would be the way to go.
Larry,
you said people have installed lumps in the roof before?
Quote: "sharing that info
for others to what has been done in the past".
If they have, how did they attach the lump?
Maybe I could send you some pics & maybe you can have the lumps casted or machined to sell? Possible???
I made mine out of billet aluminum & hand shaped them.
They ended up smaller than I wanted,& not the shape I wanted.
I did not take the proper amount of time to make them the way I wanted to but they did improve things.
The lower lumps are best, they improve the short turn radius of the port & step up the air/fuel velocity.

Im not sure how they did. But i'm pretty sure they may have bolted it. There is room to do so with out hitting water.If they didn't try to bolt
it in somewhere Past/deeper then where the Bolt
boss is. As for what i was once told again I don't remember who i talked with about the lump
in the Head it was a few years ago. So i have no
idea what it would look like. But what i understood back then Is it went Not much deeper then the Valve guide boss.

Now as to making or selling them we could try If You wanted to? But before doing either I'd have to see what & if there is any Gain in doing so.
verses Just raising the port. Also another Issue
that may come about is trying to install it Over the top of the other.( meaning Depening on it's shape and size. IF it wings out like the lowwer one does It could??? be a problem going over the lower)
like i said never seen one so I don't know.

The lumps I made ,I did talk about a few years ago, you asked me about it then.
I did not have a digi camera then (to send any pics) ,so it just got forgotten about?
It is bolted through the upper headbolt area (one bolt,no drilling required. I machined a piece of aluminum, sorta like a piston pin button,this piece sits on the outer part of the head, a bolt goes through it to the upper lump that is drilled & tapped. A little Hylomar applied the the piston button like piece.
The lump goes all the way to the back of the port & help direct the air fuel mixture to each valve.
I will see if I can take some pics today.

Twisted6 I.I

I sent you some pics,, let me know if you got them?

i'd like to see them also. you say they extend all the way into the port? may be what i am talking about. tom

Tom, they are only lumps that bolt to the top of the port .
It does not divide the ports.

Hank Yes i got the photos I have down laoded them.so that i can inlarge them a clear them up even more. From what i can tell so far maybe?? they could be redone and maybe set more towards
useing as a type of divider at the same time??
But i personaly think defineing the shape and testing should come first.Before trying to pretty
much make it a up grade to a divider at the same
time. ?? right??

What gain did you see from these. Real world tests
(mpgs, performance,flow bench?? before & after)

Hey HANK!!!

Send those pictures for me too!!!!

Hank
I picked out the best photos. I had croped them and have a Nice veiw now.Now my personal oppion
is these would have to be installed after the lower is already in place.Mainly because of the way it turns down the back wall. It also seems as if it could be a little more wing shaped to help redirect/redeflect air down the back wall and around the valve. From a side veiw it looks to be as if you have a small Gap as the roof line curves
down the back wall?? Am i right in seeing this in
the photo??

Tom in July 1979 issue of Popular Hot Rodding magazine they have an article on port dividers complete with a pattern. I will make copies and send them to you.

Steve O #1623
Mid Atlantic Chapter

Yes it is a full size templet. The topic on that
article was Build a street/strip chevy six for under $1000 Yeah maybe back then. But even back
then The head still cost more then The BLOCK Build.

str8 do you have Junes issue same year on the 230
@ 460 hp

since i'm curious, if anyone wants to send me those pictures..articles...etc..that'd be great!

i have no means to make anything precise enough to be used on a head, but i love to learn. and, since i like to consider myself the next generation of inliners and all that...

w_blind@hotmail.com

feel free!

especially the cheap build articles...and, well, anything inline, really.

thanks guys. i've been reading this thread consistently...i appreciate all the innovations!

.later days.
.sam.

Twisted yes I have june 79 PHR magazine. I saved every article I came across if it had something to do with an Inline 6.

Steve O #1623
Mid Atlantic Chapter

steve, if you sent me images that would be awesome. i would also post them if i got them, for others to view. no secrets with me. i want all of us to gain from something from our efforts.these old motors always get more attention then the other crowd. i was just hoping that someone had experience with this exact topic and could post their findings. tom

Twisted6 I.I
The lumps do not follow the roof of the port that well, I did not take enough time to do that.You can get the shapes close & fill in the gaps w/JB weld. :-)
These lumps were made from billet aluminum & it takes a lot of time to shape them perfectly.
Yes the back of the lump was suppose to be winged shaped to help direct the air/fuel mixture around the valve bowl area.

tlowe I.I.#1716 , I believe if you completely divide the ports ,the port window gets too small, forceing you to have to open up the entrance to the intake port, causeing the air velocity to slow down too much (not good for normally aspirated) unless you are super or turbocharged,where the air is being forced through the port.
Tom & Douglas I will send you some pics also!!!!!

STR8 6
If you could send me those pictures or copies of the mag, that would be great also.
Thanks

STR8 6

I got those pages back in 83 from a friend who RIPped them from the book. So i was just woundering how many pages there was. If i'm missing anything. I have 7 pages from Julys which Im sure is front & backs to make copies I don't have What came from the book Only copies and 7 from junes issue and on these you can see where the Pages were folded. I used to do the same thing ONLY kept the Mags that had any L6 related.
But now I no longger get them in the mail and Very hardly buy the mags anymore.

Tom and Twisted copies of the PHR articles from June 79 and July 79 are in the mail. Sorry for not getting back to you sooner but I was at Hershey buying more parts (stuff).

Hank I would more than happy to sent you copies also, but I'll need your name and address. Send me a private message if you like.

Steve O. #1623
Mid Atlantic Chapter

thanks steve O.

Thank you Now I'll know for sure if I have all
of it. Again Thank You.

Did the article flow test them w/any results?

When I divided the intake port for flow testing.
I could not open up the entry window large enough.
It actually lost cfm.
The divider plate I made was with a thin piece of aluminum, with modeling clay to hold it in place.

Hank,

I wouldn't pretend to have anywhere near your experience, but I'm not so sure that the flow bench would give the whole answer. It seems to me that an engine with a single port (assuming crossflow here) for all six intakes could possibly flow more CFM, but wouldn't perform too well. Remember the "unnamed one" that used to post here that did all of his racing on the flow bench?

You are correct, flow bench does not tell all!

I would think if you have a divider that came from the back torwards the front of the port ,,but not all the way, it would not make the intake port window too small.
I never got around to making a partial port divider.
Larry,, what do you think??

Well Back sometime ago when The divider was Used They also did the whole Intake system as well. This pretty much is How The Lump port came about Becuase it worked much better.
I think the upper lump that you made,IF?? it only came to the front edge of the lower Lump this could maybe? be the way to go with the upper.
The reason I feel this way is That it could very well help redirect the air from Slamming into the back wall,As in simply redircting it in and around The back wall and the Valve. As it come down off the ceiling.With all the Heads I have here cut up.I'm going to cut another SO that i have a 100% of the Back wall leading down to the floor. Then I will rework what You have made, IF this is not a problem with you.?? To see what turns out to work the Best with the Lower one OR one on it's own.

Larry, it's no problem if you decide to make upper lumps.
Like I told you in a email,the aluminum lumps I installed were not like the shapes I made out of modeling clay while bench flow testing.
They are a truely easy bolt in lump, just need to remove the intake boss to install.
I hope they do work out for you, and for the inliner community!
We got to beat those v-thingys somehow!!
Let us know your findings when you get a chance.
Goodluck!!

STR8 6

I got them copies today Thank you. and it does seem that i do have/had the whole thing.And this is much easier to read then my copies.
Again Thank you

Str8 6;

i received the articles today.

thanks much for them! they've been a blast to read..can't wait to get at 'em the 2nd and 3rd time.

thanks again.

.later days.
.sam.

STR8 6
I also recieved the articles today.
Thank you very much!
I do appreciate it!

i also recieved them. i'll get them scanned to put out for all. tom