Linc's log modification

[Anonymous]

I have been studying the two barrel log Linc's had drawn up. The challenge I see is fabbing up and fitting a plenum for the secondary venturi to the outside runners. Sorry I don't know how to copy that pic. Maybe Linc's could post it.

The problem addressed is the dead ends at 1 & 6. By feeding these with that second "log" you would have a better charge.

What if the plugs on the ends of the log were opened to match the rest of the runner, and a 270 degree tube run to an opening between 5&6 and 1&2. I don't know how to put up a drawing. This would loop the charge around instead of slamming into the plugs at the ends. I can't begin to understand all the flow dynamics involved here, but on the surface it seems to make sense.

 

[Asa]

the problem with that is that you're forcing the A/F mixture to take the long way around, you want to keep it as straight a shot as you can
not too mention that the curves would most likely cause fuel to condense and drop out of supension

 

[Anonymous]

My thoughts were of a pressurized intake charge.

Under normal operating conditions, the charge would be drawn in as if there were no extensions, right? Just straight down the runners without reaching the returns.

Under boost the returns would make the turns and come to almost a straight shot to the outer runner's.

The condensation is an aspect I hadn't considered. If enough condensation ocurred it would make the outboard cylinders at the least rich, and at the worst flooded.

Suppose you took the ell's around the top side? Still the same issues under "N/A" conditions? Wouldn't the temp of boost help to keep fuel in suspension?

 

[wallaka]

I'd much rather have it too rich than too lean :fume: :fume: There are your pistons!

 

[Anonymous]

How's this?

This is a pretty easy design IF you have the later year heads with the EGR pad on the side. I also plan to mill out the area where the EGR ports are/were and use that as a balance between the two sides.

I have so much going on right now, it is n't funny. Will try to do some mods and get some pics up before too long!!

 

[STEVEN.]

"Linc'n-Log." . OO6.

 

[Anonymous]

"Linc'n-Log."

My ex-girlfriend's best friend use to call "it" that! (I am serious)

 

[XFlow_Fairlane]

have you thought about this idea:

mill the top and outer side off the log kinda leaving a L shape pocket. then this gets milled flat/square and just drill adn tap for a hunk of 2" square tubing? basicly you would need to notch it for the ports and all but then you could get in there to port the head nicely and even fab up a wider plenum on it for a 4bbl if wanted or at least a 2v mounted the "correct way"

 

[Anonymous]

mill the top and outer side off the log kinda leaving a L shape pocket.

That is a good idea, but the bottom inside corner of the square tube would cut in too far I'm afraid.

I tried a few sketches on paper - - - you could mill off the whole side of the intake log (the outer 180 degrees of a 360 degree circle) and fabricate an oval shaped tube to fit into the inside half - or "D" shaped, with a flat outside and round inside.

I would like to see some pics of logs that have been milled to see how stright the log is (or not) to see how feasible these ideas are.

 

[Anonymous]

From now on I'm going to refer to you as "log" !!

That drawing is what I've been refering to. I have looked at the head and with a 2V base I'm trying to figure out the secondary plenum for the outside legs. There just doesn't seem to be room without removing the entire plenum from the log.

That was what led me to the idea of the loops on the log ends. The flow dynamics would push mixture both into the open valve, and past into the loop. Then the loop would redirect the mixture back to the areas between 1,2 & 5,6 at a 180 deg shot.

Or the whole thing would just be pressurized and the loop would just be a new dead end.

I can't picture it as an improvement at anything but high rpm ranges where you would have a constant flow.

Probably just full of s**t anyway. Thinking out loud and just farted.

 

[Anonymous]

From now on I'm going to refer to you as "log" !!

please don't.

an improvement at anything but high rpm ranges where you would have a constant flow.

extra plenum volume??

You might be on the right track - - - part way.
Get a book called "the scientific design of intake and exhaust sytems"

http://www.themotorbookstore.com/scdeofexinsy.html

I read it when I was 16 years old!!

 

[Stubby]

Get a book called "the scientific design of intake and exhaust sytems

That book is awesome!!! VERY DEEP but awesome!!!
I think I would have to read it about a dozen times before half of it would stick.

 

[Anonymous]

I think I would have to read it about a dozen times before half of it would stick.

I needed help from an engineeer friend to help me with some of the math and some concepts.

The book will make your head hurt - - in a good, "exercising my brain cells" kind-of-way!


The original designers of the log head never even heard of that book! :boom: :nono: :smash:

 

[XFlow_Fairlane]

what are you needing? (I graduate with my bachelors in 6 weeks or so)

if you are looking for airflow help.....welll that is pretty tough to set up without some $$$$ software. I can do teh hand calcs but they totally suck (it is based on iterations) although you could setup a nasty 3d matrix to do it...but wouldn't be easy. I will look into inventor10 next week and see if the basic FEA plug in for it will support it. we have ansys here but I have no clue on how to use it.pretty much what I learned from my engineering classes is how to ANALize a system and see where to make changes...there is no formula to optimize anything really. all you do is move stuff around and imulate your conditions to see if it made it better or worse.

 

[Anonymous]

That is why I try things by the seat of my pants and forget trying to calculate stuff.

 

[jamyers]

Seems like it would almost be easier to mill the log off and make a sheetmetal intake that looks like a Chrysler slant-six, one of the Weber intakes for an MGB 4 cylinder.

 

[Anonymous]

Seems like it would almost be easier to mill the log off and make a sheetmetal intake that looks like a Chrysler slant-six, one of the Weber intakes for an MGB 4 cylinder.

milling the log off has a lot of positives and negatives - - - my idea was something someone could do at home without a lot of SERIOUS fab and machine shop work (like millling the log off and building an intake!!!)

 

[Anonymous]

Have you got a plan for the outside runner and plenum?

 

[Anonymous]

Have you got a plan for the outside runner and plenum?

yes.

 

[XFlow_Fairlane]

hmm.....I do have a E0 head to play with....maybe I will hunt around the shop tomorrow. if I could find a large hunk of AL tubing in the right size maybe use a ball mill to cut a curved trough for the tube to sit in similar to my square log idea?