91ToyTrck

I'm very speachless after reading all of that thread. I really don't know what to think anymore. He does explain things, but to someone that really doesn't understand that much about said things then it's french to me. I think that I understood the jist of what everyoen was saying and especially Gadget, but I'm not really sure at all.

I guess I need someone to actually explain it to me via IM or something so I can ask questions as they are going along. That's just a lot of saying one thing and then another that kind contridicts, but not really. I'm basically lost. Yeah.

snap-on

hmmmm The problem is you have mixed to tottaly diffrent theroy's in fluids.

the flow over a wing, is NOT like the flow through a tube. There are a lot of other considerations concerning Renolds number, lenght of pipe vs diameter of pipe.

Ill dig up some math to back what im saying in a weee bit...

as Gadget used some farily simple examples to prove his point. (which is correct for free air fluids) try this

go get a papertowel tube or tolet paper tube. and blow through it (more to the point breath through it) the diamter is large and the lenght is "relitively" short. now go get your garden hose and try the same thing. by Gadget's example it should be EASER to breath through the smaller garden hose. (even one that is only a foot long) when in fact that ISNT the case. and if that example doest do it for ya, go get a drinking straw and try to "breath" through it. just because its smaller does NOT make it easyer to breath through because its is supposed to be at a "lower pressure" as the breath has to travel faster..... mmmmm NOT!

you and your motor are going to experience the same thing.


(math still to come)

mt_goat

Me? I didn't have any posts in that thread did I? I'm just said it was interesting. I agree that fluid dynamics are much different in a pipe than over a wing, but I only had one semester of fluid mechanics and very little fluid flow design experence.

I'll repeat: My advise is look into lower gearing.

snap-on

no not "you" goat, i was address the post over on TTORA but dont feel like going to the trouble of regerstering and all that crap just to argue over "back flow" pressure....

tc

Actually, the flow through a tube is EXACTLY like flow over a wing, but in 3D. Bernoulli's principle still applies - high speed/low pressure.

But you also need to consider that your exhaust does not handle "steady state" flow - more like a bunch of pulses. A GOOD header helps by "arranging" these pulses so they don't interfere with each other, and you get closer to having a steady state flow through the rest of the exhaust. A BAD header allows these pulses to bunch up, and strange things will happen (compared to what you would expect from your "steady state" equations).

Constructive/destructive interference of these pulses come into play too, as anyone who has heard a highly tuned header will understand.

91ToyTrck

I'm glad that everyone on this board seems to understand the sciences behind these things, but I'm still torn between buying a header or gears w/ a locker.

wrenchmonster

I'm late to this post, but I'm definately interested depending on cost.

enutter

ummmm........?????????

fnrunner

the mod's have stepped in to help us clearify things with Thorley over on the thread they started in the vendor section,,,,,,,

JackKnife

Actually, I think we scared the Thorley guys off the board.
It's sad, I would rather buy from Thorley over Downey or NWOR. The problem lies in the fact that the 3VZ-E hasn't been used in a vehicle for over 10 years. And, out of the ones that it is in, many have been modified with drivetrain lifts, different crossmembers, skidplates, and solid axel swaps. Downey's and NWOR's product has been out for some time. There are pictures all over the Internet. I know from these pictures that neither of their crossovers would work for my vehicle. Since the Thorley header appears to be bundled with the crossover, I need an actual picture of how the crossover runs to get an idea of if it will even fit.
Now, if Thorley decided to unbundle the product, so that I didn't need to buy a crossover that most likely wouldn't fit, then I would by throwing down money right now.

mick cassidy

i want to put these thorleys on my v6 but does any know if thete carb approved so it passes smog here in ca ???

MaK92-4RnR

they are carb approved and smog legal... good job on resurrecting a 4 year old post lol

https://www.yotatech.com/forums/f116...xhaust-192629/

Brhesson

There are three current manf. Of headers that I've found.

I would recommend calling the individual manuf. & asking about CARB, ceramics, etc.

As of Jan 25 2010:

Thorley was $620
LC engineering. $800+ shipping
NWOR was $1050 + shipping

nwor boasts they have the best and seemed alright on the phone. So my question is; what r the problems with NWOR ?? The general idea I get is they are rude on the phone or that they ship you the wrong parts, or something. Just curious.

MaK92-4RnR

I bought DT and mine function just find. No leaks or anything.

barthmonster

With the Doug Thorley's did you buy an (extra) cross-over pipe from them also or did you just have the muffler shop do one ?

Do people run duel-exhaust (with crossover) on v6's like the v8's musclecar guys do ? or do they instead use one of those mufflers that have 2-inlets & 1-outlet ??