Outer Limits 4x4 Board

can anyone tell me what they know of MRT extractors?

thinking of getting some but just wanna be sure they're good for the money.

i've never owned them personally but from the sound of what people have said mrt quality has gone down.... mrt has cracked prematurely and so on... i personally ordered a set of hurricane extractors for myself... have yet to fit it but a man in germany has and loves it... david has em as well so you could ask him.

Ok here is my 2 cents.

Huricane extractors - I have recently fitted extractors to my car. I wanted hurricane ones but apparently they are not availiable any more. The people in the exhuast place got me some lukey ones which are apparently made by the same company as hurricane's but lukey buy them wholesale and put their own badge on them!!!

The Lukey extractors are alright, It said in the book that you can't fit them if you have airconditioning but thats a load of bull. What you will have to do how ever is elongate one of the stud holes, for memory it was the 2nd in from the right at the top, as they do not fit. Everything else is sweet about them. The ones that i got are 4 into 1, these aren't the greatest as they are mainly for top end power but thats where my engine is most of the time when i'm offroading anyway!

Jason you are flogging the posts eh?

Dave

That's interesting info Dave!?

Hurricane (from all the info available on the net) appear to be made by Liverpool Exhausts in Sydney. Lukey are part of Tenneco (ie. Walker exhausts). The Hurricanes are/ were a 4-2-1 design; the Lukeys are 4-1. The Hurricanes also come with a gold (cadmium?) coating, whereas the Lukey are supposed to have some flash high temp black coating IIRC?

I've posted pics on here previously of the Hurricanes. There are also a number of companies that make suitable extractors that were listed. AFAIK the Lukey's are the only 4-1 design.

am i right in saying that 4-1 is high end power, and 4-2-1 is for torque? how much difference is there between them, and why is there a difference???

It's all got to do with the length of the pipes, how they intersect, the exhaust gas pulses helping to "extract" the spent gases from the cylinder etc. There are formulas for calculating pipe length (eg primary length) based on engine capacity, revs.... and god knows what else.

That's my simple explanation (- I don't have a complex one!)

Did someone accuse me of flooging the post????

I've had my Fez for bout 6 months and have just got the resources to do some mods to it.

Just looking for advice before i go ahead......

By the way, how many post do i need to be a rock god? hehehe

its not how MANY posts you need to become a rockgod... its how many posts of yours are senseless gibberish.... like bogged, tonka, nam, etc etc etc..... i rest my case.

murcod wrote:It's all got to do with the length of the pipes, how they intersect, the exhaust gas pulses helping to "extract" the spent gases from the cylinder etc. There are formulas for calculating pipe length (eg primary length) based on engine capacity, revs.... and god knows what else.

That's my simple explanation (- I don't have a complex one!)

so what i right 'bout which one is which? and how much difference is there?

SimplyPV wrote:its not how MANY posts you need to become a rockgod... its how many posts of yours are senseless gibberish.... like bogged, tonka, nam, etc etc etc..... i rest my case.

i don't think many ppl with high padcounts really care that much, let alone take themselves seriously. see my sig line

stumped wrote:

murcod wrote:It's all got to do with the length of the pipes, how they intersect, the exhaust gas pulses helping to "extract" the spent gases from the cylinder etc. There are formulas for calculating pipe length (eg primary length) based on engine capacity, revs.... and god knows what else.

That's my simple explanation (- I don't have a complex one!)

so what i right 'bout which one is which? and how much difference is there?

Yes, apparently so... 4-1 are used on race cars etc when the engine is mostly used in the upper rev range. Very suitable for Dangerous Dave.

It would be interesting to do a dyno comparison between the two on the same engine with 4-1 and 4-2-1 extractors being the only difference.

Ive got hurricane extractors, Im in love.

Basically 4-2-1 will help you from 0 revs throught to 4-5000 revs and then the power curve will drop where as 4-1 will be a little sluggier to get to 4000 revs but from then on it whoooo hooooo. But keeping the motor at this rev range all the time promotes Rear Main Seals to sh*t themselves as i have recently found out.

Dave, the word for "extracting" exhaust gases is called scavenging i believe.

Dave

i was just quoted 430.00 for a set of hurricane extractors so i'm guessing they still make them.

just focusing on the lift at the moment so they're on hold.

so if ya got an engine that doesn't put out heaps of torque, but is pretty revvy naturally, would ya bother putting in a 4-2-1 to try and get more torque out of it, or just go with the 4-1 to improve on the way the engine is naturally biased?

I got the 4-2-1 to help improve torque, but they also improved the top end... That's why it would be interesting to see a dyno comparison.

Hey guys, I know this thread is a bit old, but I just had a question to add to it.
Would you be best off to get a custom manifold/extractor set-up..?? Cause I am going to get the entire system replaced (eventually), plus I think my Oxy-Sensor has s*it itself too, and my bloody cat just whistles, even after bashing it with a hammer...!! Was thinking if you got your entire system customised you could get your system to get a good even power balance, so good torque down low, but tune your muffler (and anything else you can tune) to compensate for lacking power up high.

I am delusional or would this "theoretically" work..??

Having extractors custom made would most likely be very expensive and honestly, in my opinion there isnt gonna be a huge improvement over factory extractors. If you were doing it to a high horsepower turbo car then a custom manifold and tuned exhaust would be worth doing, but not on a 1.6 daihatsu donk.


As for your whistle, I had the same and thought it was a cracked manifold or cat but it was just the muffler. I got a new 2 inch system from the cat back with a new free flow muffler and the whistle is gone.