Sedan tri-y header

[modok]

[modok]

[ralf]

[modok]

Shoot man, if china wants to make them then that's fine. I'd buy one
Did you see the tiawan attempt at a new performance design? utter baloney it was, but well constructed. The design is FREE to anybody who wants to construct it.

DIDya hear that VINTAGE SPEED OF TAIWAN?

[ralf]

i stil like the fact that

this lay out is "new"

the pairing ofcourse is.. ideal and

you mention tangerine has done the pairing

alot of others in europe too like remelle etc

but the lay out you did.. kind of works well as far as ground clearance goes

plus you can prolly run one of those sidewinder mufflers
if you put a merge 2-1 prior to the muffler

so it needs 1 inlete 1 outlet muffler
_________________
Flow Through a Curved Conduit

porting my SP head for my brother's project
https://youtu.be/OS_mVjQuqgk

[modok]

The secondaries do merge together as they enter the muffler, it just doesn't look like it from the outside. That is the third muffler to be grafted on, so that area of the header isn't as "cleanly constructed" as it could be.

Even if I do discover good performance with a glasspack, I'd rather have a chamber type muffler.
Lower frequencies are generally perceived by people and animals to be more "threatening" than higher frequencies. There are a lot of reasons for that.
So you dampen the low frequencies and then your neighbors say it sounds good instead of "too loud", even though it's just as loud.

[fivelugshortaxle]

You want to make a 1 5/8 header for me? I'll buy and test for ya?
_________________
Good things come to those who wait.
2332 with lots of goodies....
Rotating assembly balanced by Brothers VW
4340 84mm crank
AA 94mm p&c' s
Total seal 2nd ring, rest are Grants
5.5 h beams
Magnum straight cuts
Steve Long XR310 on a 106
CB 1.4 rockers
CB Magnaspark 2 distributor
NGK D7ea plugs
A1 lowdown 1 3/4 with single muffler
Dellorto 48's with 40 venturies
Kennedy Stage 2 with Daiken disc

[modok]

Hmm, well I do have some idea of what would suit your "149HP" engine

If I do get geared up to make a few, you'll be on the short list, but for now I cannot make any promises.

[ralf]

[ralf]

[modok]

It would be "nice if"
If the bumper mounting area is cut out of the car it would allow the pipes going into the muffler to be higher, and therefore much easier to use a more common muffler, but I wasn't willing to do that.
But your right it could be done.

[fivelugshortaxle]

[donnmon]

tri y so far.

primaries 32inches 38mm tube
secondary's 20 inches 42mm tube

these lengths include the merges. does the tertiary length matter?

the whole thing has taken about two days to construct so far but the layout took about another half a day to work out.

if it helps anyone else to work out their layout we did this with 6mm rod and reference the radius stated by the mandrel bends we were using, this gave us a centreline map which it turned out was pretty accurate. it saved a lot of time and pipe.

most of the work however was done by Glen because he put the time into the R & D. Many thanks once again.

[SBD]

Looks nice, but can ya do it with heat?

[modok]

WOW, awesome buddy!

The tertiary length doesn't seem to be critical. I found computer simulation indicates 200mm may be good, and 800mm or longer may be good(in both cases it theoretically widened the rpm range a slight amount)......but it is only a small change, and in real life I haven't found any big difference.
I DID find that it likes to be large diameter. I did not find ANY advantage going smaller than 2" in any point between the secondaries and the volume of the muffler.
2.125 might be the perfect size, but it's either 2 or 2.25 in inch tubing..... so I preferred 2.25
Is there a better selection of sizes in metric tubing?


That layout with wire sounds like a good idea. I just lay it out by imagination and with scraps of old headers. It this point I have a LOT of scrap tube. i

[tncsparky]

You can get a bunch of different bends from Summitracing.com
_________________
"My Daddy told me, son if your stupid today you will be stupid tomorrow"



scotth17
I think you are just waiting around for a high-five from a unicorn so you can feel better about yourself

[modok]

I've found everything except tight radius aluminumized, and a 1.5" expander.
It could be that the aluminum flakes off if bent too tight, that would explain it, which is too bad.

[tencentlife]

Nice job, Glen!
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Please don't PM here, I will not reply.

Experience is kryptonite to doctrine.

[donnmon]

[tencentlife]

It's not pipe, it's tubing, and in the US at least, tubing is always measured on the OD. Pipe is on the ID.
_________________
Shop for unique Vanagon accessories at the Vanistan shop:
https://intrepidoverland.com/vanistan/

Please don't PM here, I will not reply.

Experience is kryptonite to doctrine.