4.2 Headers then 5.0 headers
#42
Derek,
Attached are the Photos I promised you of the Aston-Martin Headers a Friend bought to install on his A-M V8.....He paid around $4,000. for them....They are pretty and unique but I don't think they would fit a 4.2 Jaguar as they sort of bend toward the center of the car....remember A-M has a Torque-tube, where the Jag has a Transmission...They are really pretty the way they are formed....Note how they merge at the end.....
Maybe this will give you some ideas! I love the way they are formed but I don't know what they call the process..
Billy Clyde in Houston
Attached are the Photos I promised you of the Aston-Martin Headers a Friend bought to install on his A-M V8.....He paid around $4,000. for them....They are pretty and unique but I don't think they would fit a 4.2 Jaguar as they sort of bend toward the center of the car....remember A-M has a Torque-tube, where the Jag has a Transmission...They are really pretty the way they are formed....Note how they merge at the end.....
Maybe this will give you some ideas! I love the way they are formed but I don't know what they call the process..
Billy Clyde in Houston
Notice how the branching is different between the left and right bank? On the right side the pairing is cylinders next to each other; front pair and rear pair, on the left bank the pairing is changed to separate the adjacent cylinders. This is exactly what I keep banging on about in regards to the firing order, it's done this way for a reason...
#43
I would absolutely LOVE to see the same tests done with a supercharged engine because that's the kicker for us.
I am not convinced that the gains on a naturally aspirated engine translate directly to a supercharged one.
I am not convinced that the gains on a naturally aspirated engine translate directly to a supercharged one.
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Panthro (07-07-2017)
#45
The engine master series really isn't that good. Frieberger and company are car guys, not necessarily engine guys. It makes nice video for the couch potatoes. The video on X vs H pipes could have moved the conversation forward but fell flat because they don't understand how it work. The goofy guy with the DB meter was the smartest of the group but he seemed to just be there for comic relief.
#46
#47
Jaguar has announced a $170,000 hot rod XE with supercharged V8 producing well over 600 hp. I think it would be interesting to compare our superchargers, camshafts and intake/exhaust manifolds with this new motor's components. I wonder if Jaguar is using the same exhaust manifold?
#48
An engine is an air pump and is only as efficent as it's biggest restriction. Why would exhaust extraction on a supercharged engine be any different than on a naturally aspirated engine?
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Cambo (07-01-2017)
#49
Quite how that changes the exhaust side of things I'm not clever enough to understand.
But so far I have not seen anyone show me the same gains from fitting headers to a supercharged engine, as a naturally aspirated one. Like Steve's examples...
#50
BadCat Headers
Cambo,
Concerning the BadCat Headers, I read some of the information on his Website and found that he did not design them as he had some other Engineers work out the design considering how close the space is in which to put the Header on the Engine and hook up all the Cats and rest of the Exhaust system. So, it appears that more thought and work went into these Headers than we anticipated. Avos has a point though and that said, I would like to see some Dyno Runs that show what they are doing...... When I talked with him several months ago, he said he wanted around $2,400.00 for the Pair.....At that point, I sorta forgot to ask about Dyno Runs! Sorry!
Billy Clyde
Concerning the BadCat Headers, I read some of the information on his Website and found that he did not design them as he had some other Engineers work out the design considering how close the space is in which to put the Header on the Engine and hook up all the Cats and rest of the Exhaust system. So, it appears that more thought and work went into these Headers than we anticipated. Avos has a point though and that said, I would like to see some Dyno Runs that show what they are doing...... When I talked with him several months ago, he said he wanted around $2,400.00 for the Pair.....At that point, I sorta forgot to ask about Dyno Runs! Sorry!
Billy Clyde
#51
The answer is that under boost the engine theoretically becomes larger. 14.3 psi is one atmosphere, what we walk around in. Add another 14.3 psi of boost and you've effectively doubled your engines power output (less drive losses for the blower). Unobstructed flow is actually more important upstream from the blower vs. downstream from the engine because it's easier to blow through a straw (restriction) than suck through one.
#52
14.3 psi is one atmosphere, what we walk around in.
Add another 14.3 psi of boost and you've effectively doubled your engines power output (less drive losses for the blower).
Unobstructed flow is actually more important upstream from the blower vs. downstream from the engine because it's easier to blow through a straw (restriction) than suck through one.
Getting back to my original post in this thread and the point I was trying to make: Until we know how big of a restriction the stock exhaust manifolds are, developing headers is pure fabrication ****. Given the current numbers the tuners are getting from these engines, all of which are under 700 crank HP, I feel that the gains from correctly designed headers won't justify the cost vs. extrude honed stock manifolds. When Jaguar guys start swapping the R1900 for a 2300 or larger and start making BIG numbers like the LSA and modular Ford guys are doing, I can see the justification for a set of headers that will require the removal of the engine to install. Until then, it's all just shots in the dark.
#53
#54
We could have an interesting discussion about all this but honestly I don't have the time right now. For arguments sake, take your mouth and nose shut, poke a 1/4" hole in it and go for a run. Try it again with another 1/4" hole, this time with a flap over the outside that acts like a check valve, that's your free flowing exhaust. Finally flip the valve around. Then your intake is free flowing and the exhaust isn't. I think you'll find it's a lot easier to breathe in through both holes and only push out the little one.
Kind of like breathing in through your mouth and out the nose while running to control your breathing.
Kind of like breathing in through your mouth and out the nose while running to control your breathing.
#55
#58
#59
#60
Cost vs Return
jahummer, It appears that they don't want to make their "Money" a little at a time..... for a few dollars more, you could get one of AVOS's Kenny Bell Kits! Now we're talking lots of HP per dollar not just a little......The maximum HP they could make is what? 20 to 25....No way for me! Although they sure are pretty!!
Billy Clyde in Houston
Billy Clyde in Houston