Inliners International Forums General Discussion Hi Performance who will share head flow #'S

For those that have asked Here is a flow sheet on the T6Racing Lump kit with VERY mild port work

Larry, would you have a flow sheet for a stock head so we can see the difference?

I am doing some more updating & testing. Which there will be more info for the stock head. In regaurds to the Stock Valve & head. With no port work once so ever. and so on.And all I am going to say in the rest of this matter for now, Is has to do with redesigning and Increased flow.

I now have flow #'s back on my first flow benched head.

This is a head with 1.84 intake valves and 1.60 exhaust valves. It has had valve unshrouding done to it and the guides have been coned shaped.

First port is a intake that has had the bolt boss removed and has a cap screw sitting in the bottom, like it would be in use.
1.84 intake @28" on a superflow
lift flow
.100 62.1cfm
.200 115.3cfm
.300 168.7cfm
.400 184.3cfm
.500 195.6cfm
.600 202.0 cfm

1.84 intake with a HI-FLOW bolt in intake lump
lift flow
.100 57.8cfm
.200 112.9cfm
.300 166.9cfm
.400 202.0cfm
.500 215.6cfm
.600 226cfm

What is interesting is the 10% increase in flow with the bolt in lump at higher lifts.

how do we increase flow at lower lifts also? i do have a easy way for me, turn up the boost.

also does anyone know how to present this info to show total flow difference, such as thru a valve open to close flow?

tom

Tom I find it very interesting That you say your Lumps out flow mine. at least 10 cfm off pretty much right from the start?? Well some where then I think/feel you need to go back and Relook at your head work Or Lump. Those numbers seem to be off?
This is from a head that Had No valve guide work and Next to nothing for port work.You can go back and look at the Flow sheet
topic i posted.(For those that have asked Here is a flow sheet on the T6Racing Lump kit with VERY mild port work.) Well sorry that it just jumped to the Top of page 5 here. But anyway you will find the sheet.

larry,
when have i said my lumps outflow yours? they may, it is just a matter of more playing with the head. the only thing i did say is they fit better. i have used both yours and mine and PES lumps. PES fitting the worst, they are almost like bolting a rock in the port. i have a spare set if anyone wants them.

i think all in all, my head flows very nice.

the next thing i am working on is a ramp to bolt into the intake manifold and meet a squared lump in the head. according to leelites and PES this is the ticket for flow. it is worth a try. tom

There is a guy you want to get advise from,,,, Leelites.

If you want the ticket for flow I would get advise from CNC dude.

Or Larry, but I don't think Larry will help you,,,now I could be totally off about that,, LOL.

There is a lot more to cylinder head flow than you think there is,but you might get it & then you might not.


MBHD

Well Tom
I wasn't saying yours OR PES's didn't flow.But also I can see Just From YOUR sawZall Video that they don't Fit any Better either,and i am flattered you copied mine so well Thank you.And Honestly I can't see anyone Telling someone to USE a sawzall on there head. But Yes I hear alot from many in AND out of the Grape vine as one would say. I have flowed many heads with different valves, angles, port shapes,and LUMPs.And I am still doing so.Right along with intake design.So now anyway their will be a new and improved design comming out in the near future.

Hank
I would also like to add I have been working on what you sent me
sometime ago.Designing it to work better with a lower lump. That
is all I can really say about this at this time.

Partly more of my2cents

OK Larry, just as long as my name gets mentioned.
:-)


MBHD

As many seem to ask what the stock head flows with the stock 1.72 valve It's in the Book. and Like i have said many times before It only flows about 170 cfm. and in the book it states 169
on the intake. The exhaust with the stock 1.50 flows 122 cfm.

You guys are comparing flow numbers from two or three different machines in different parts of the country in different weather conditions, so the numbers don't really count for much other then for bragging rights. If you get all the heads to one shop on the same day, then you can compare side by side results.

Dad and I have a flow bench and have seen different results from the same head on the same machine with just weather changes.

So it numbers don't mean much, its the average increase each of you see on your own machines that counts.

Joe

Joe you are so right. This same issue came up a few yrs back and I had said the same thing many times over. Humdity,rain an so can change it all. Even in the same day.
The head will also flow differently with a port plate? if i remember right. But that is something I will recheck myself.So i can my brain a little more up to speed lol.

Well, its not like a stock head you flowed 170 SCFM then the next time it flows 200. Correct?

MBHD

it is much less than that. but with my heads, i have seen a honest 10% increase over the open( no bolt boss) port.

so far i also see about 163 on the exhaust @ .600 lift. tom

No is doesn't change quite like that.The differents are not that far Off. Not that i ever seen a few CFM at most. Nothing like 10,15,20 point difference. But then again I have never taken a head from the south to the North or the East,west.Nore have i seen weather make that type of change either.

No its not a drastic change, but the point was, don't use numbers to compare yours to mine. Flow benches are like engine and chassis dyno's, it all come down to how the operator sets up the machine.

Whats really needed is a flow as you go test.
Start with truly stock head with good valves and guides,
change out the valve size for the next step,
cut out the bolt boss,
add a lump,
with flow testing between each step.

This would show just what happens at each step, adding port work would change the out come since each guy porting is different.

Joe

By efi_diy at 2008-10-05




ok I couldn't resist....










Ported 2006 4200 head...


As Tom said once "I feel like I showed up at a gun fight with a knife.."