|03-19-2013 02:53 AM|
FWIW I had a set of 3" Flowmaster 40's and like them just fine, tests be damned. They were what I found for a deal, I ran them, the car ran better than expected regardless of being "hampered" by the FM's. One concession I made to comfort over speed was to insulate it; I used recycled floor insulation out of the 'yard. Weighed a little but kept the drone and heat out.
But one thing I can GUARANTEE you- no one mistook it for a V6 unless they were brain dead!
|03-18-2013 04:06 PM|
Hi Dave and Bogie.
Yes to the earth from the heads to the firewall as well as block to chassis. I have oversize cables there with the rpm al heads. The battery is fully charged now after a night so its time to check the cranking spark as you say. I am waiting for the neighbourhood "word" to get back to me about the tow home.
I sat low in the seat.
I hope its not the module inside the distributor.
Thanks. I will update asap.
|03-18-2013 09:22 AM|
Lacking solid (electrically) grounds for the spark plugs; provides enough back EMF (Electromotive Force) by way of the ignition wires to fry the electronics.
|03-18-2013 07:12 AM|
(I hope none of your friends saw that ignominious event of an econobox hauling the 'stang home )
|03-18-2013 06:34 AM|
Dying stroker Dave.
had an interesting drive home today in the 67. While driving down a gentle slope, after a short run to the supermarket, I lost ignition and coasted to a stop. Hmmmm.With nearly 2000 miles on the new 347 i am puzzled. With the gas tank on a quarter, and power to the coil, i can crank it over ( until i flattened the battery) with plenty of fuel squirting down the barrels and yet not even a fire from any plug. I am thinking the msd may have a problem in it so i will start there i think. I have 12v at the blaster 2 msd coil as well. Any thoughts Dave.
My wife towed me about 2 miles home with her corolla.
|03-12-2013 04:57 AM|
I would use straight duals with Magnaflow glass packs... The H pipe sounds better to me then the X. I just don't see the need for one, they add weight and heat the transmission area. They make a V-8 sound like a 6 with a single exhaust and glass pack to me...
Those 289s are nice sounding motors with duals and a pair of packs, good luck....
|03-05-2013 11:41 AM|
The problem is insufficient torque from a 289 with which to launch this 4000 pound monster. Adding camshaft will degrade what torque this engine has right where it's needed the most. I suppose that with the cam he can add gears to move the RPM band up where the horsepower is being made in sufficient quantitiy to overcome the lack of lower end torque. But my experience in these matters tells me that for a Saturday night cruiser he'll be happier by cutting through the chase and going with a 351 keeping it in the engine family or going to the then optional FE block preferably at 390 but 352 would do while 410 to 428 would be a dream to putt behind on main street. Perhaps even the 302, which is a stroker on the 289, would help put some force-in-motion where it's needed.
|03-05-2013 11:01 AM|
You've got two major things going on with exhaust systems:
1) Is the reduction in back pressure by selection of streamlined and high flow components.
2) is wave propagation and management so if the engine is using a cam with a lot of overlap the tuning of pressure waves can be used to assist the induction by reflecting a returning exhaust pressure wave back into the exhaust system which will lower cylinder pressure which will then draw harder in the intake when both intake and exhaust valves are open. David Vizard in his writings on this subject calls this the 5th cycle of a 4 cycle engine. But this is super quirky the returning exhaust wave must be timed exactly to the valves overlap for that particular cylinder. This means it is:
A) RPM sensitive as well as;
B) Mach velocity sensitive;
C) And pipe distance sensitive.
A) Basically means that the combination effect of B and C will align at some RPMs and not at others. So the effect will be seen strong at some RPMs to little or none at others.
B) Is the Mach velocity (speed of sound) of the waves in the exhaust system.
The complicating factor here is that the speed of sound with in a gas is very dependent upon temperature and pressure. Since these two things are constantly changing within the header tubes and collector let alone the rest of the exhaust system. So calculations based upon the simple text book speed of sound at standard atmospheric pressure and temperature can at best only get you into the ball park but not necessarily into the game.
C) Is the distance that the wave has to travel from where it trips back to the valve. This in all likelihood goes beyond the effects of measured pipe lengths to where the event actually moves around inside the pipe based on temperatures of the plumbing itself as well as the exhaust gasses inside. If you will a virtual change of distance even though the physical hasn't changed at least not by much as it heats and cools.
My best guess on the paint or wax burning on the collector as indicating the optimum location for a cross over is it may be where the reflected wave is colliding with the transmitted wave with-in the collector. For typical wave reflection the H pipe is usually closer to the engine where X pipes tend to be further away. Further away means lower temperatures and pressures as well as greater distance and that probably reduces the strength of the wave's pressure pulse simply from a greater length having more surface drag. But the X pipe probably shows less overall backpressure which is a different issue.
In the end which configuration that shows the most benefit will vary by the specific installation configuration which will also be sensitive to pipe diameters as well as the entire foregoing epistle.
|03-05-2013 10:27 AM|
Well it almost appears that some of the usual suspects have succeeded in driving away one more new member by not answering his question and telling him all he needs is a bigger engine/cam/carb/mufflers/rear gears, you name it. I'm sure he would like to exchange that 289 for a mega monster - but that's not what he want to do for whatever reasons. He may have become a valued, contributing member of Hotrodders, but suspect he will go elsewhere as so many others have.
My answer to his question - Most likely neither 'H' or 'X' will totally stop exhaust popping if the mufflers are straight through types.
|03-05-2013 09:51 AM|
Test by Heartthrob
Wow, I saw the same blurb with Hearthrob guy, and it mighta been on Stacy's show, but just a couple days ago.....they dynoed (chassis dyno) both ways, and the H was significantly higher HP than the X .....I was surprised, as I thought for sure the X would have a better flow....
|03-05-2013 09:05 AM|
|03-02-2013 05:37 PM|
My 347 Mustang has an x pipe , with flowmasters with a 2.5 inch dia system. Performance data as posted by Ireland's Child says it all. They have done the techniclal research for you, so go with what is said there. As far as sound goes it comes down to personal choice.
I had a standard 302 Windsor powered Ford years ago with a twin system and glass packed mufflers with an H pipe. It sounded very quiet and not intrusive.
On the other hand the 347 ( stroked out 302) has a mild cam and sounds quite raspy and louder, but the radio can still be heard.
Its your choice. Have a listen to others.
|03-02-2013 08:56 AM|
I have a '66 Galaxie 500 w/a 289; my cam is as follows:
Adv. Duration: 262°/272°
My car is a cruiser, I'm going to be running duals from factory manifolds & I have no plans to do any kind of racing, but I also want to get as much power out of what I have; so which one do I want to go with?
|03-09-2012 06:05 PM|
On cars running tuned headers you add a couple of feet of dump to your collector pipe the same diameter as your collector and paint it Drive the car through the 1/4 mile at high rpm and At the highest scavenge point of your exhaust pulses(The highest velocity) where the exhaust just starts to slow down is the point the paint burns because the flow is slowing enough to cause a heat build up!!! you cut the dump at the center of that burn in the paint! the point in the dump pipe that you cut is pretty close to maximum scavenging effect! A longer pipe will cause the exhaust velocity to slowdown and kill the scavenging effect of your exhaust!! A shorter pipe wont enable the exhaust pulses to reach max velocity also killing the scavenging effect!!! It usually averages out to about 18 inches!!
I never heard of this working on street exhaust of any kind!!! H pipes & X pipes are designed to increase lower rpm response and level out resonance in exhaust noise by merging and deleting (Smoothing or integrating) the exhaust pulses and actually slowing down the The scavenge effect! on a drag car their just extra weight LOL
Its a back yard method, The best method is the dino and different length pipes!!!
That's all from experience in cutting a lot of dumps at the dragway LOL
The gentleman mentioned earlier he could feel the difference of the exhaust in his chest that was resonence !!!
|03-09-2012 07:48 AM|
I wonder if someone could explain this to us? right/wrong or whatever?
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