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It has been 20 years sense my thermoD classes, But on a turbo system I remember that keeping the exhaust gas temp up was a big deal.
Steve Cox-2003.25 F-250 CC 6.0 FX4 King Ranch
4" Turbo back-
Ranch Hand Cattle Guard-Hollandia sunroof
K40 2000 Radar & Laser 48 Gal fuel tank-Pioneer AVIC-D3,3 amps,12' sub, DVD, TV in headrests JOIN NEW MEXICO CHAPTER HERE!
I gasket match ported my intake and exhaust manifolds when I did my last set of heads. I can't say that I necessarily noticed any significant gains but I was able to hit 517 rwhp when 476 had been my previous best, so I guess it was something. I really don't think it's worth the effort on a forced induction engine though. Just MHO.
Payin it Forward one post at a time
I look at it like this: The advice is free and you get what you pay for; use it or dont my truck still runs fine. From a very well respected friend....Thanks
SmokerSteve I am not going down into the port to remove material...on the contrary. I really don't want to change any velocity characteristics.I simply want a larger ledge for any spent exhaust to get caught as it is trying to be sucked back in to the Head (reversion). I opened the ports up on a radius extending about 3/8" to 1/2" into the manifold.The original diameters were 1.312" I hogged just the openings to 1.500. There is plenty sealing area on the manifold flange left, and I could have gone further.To npccpartman I am not port matching as you can see.That is an attempt to improve flow. I am trying to improve the intake fuel/air cleanliness for a more efficient burn, limiting any spent exhaust from being sucked back into the head. And yes I do know this may result in a very small improvement. This is a while I am at it sort of thing as the manifolds were pulled along with the Y pipe because of leaks.Hay a7111.....I already have a source and they were made for a specific use by an OEM for a end user. I have purchase a quantity to support an Anti-Reversion Porting Kit I will be putting together. Pic's are coming.I won,t get my gaskets till monday. And I have to retake the pic's I have... as the resolution was too high to upload. ....
I almost tried the header wrap.Some people say it traps moisture and accelerates rusting. I quess I just wanted to see the effects of the ceramic coat. I also live with in blocks of a shop that turned them around fast at a fair price. They did a very nice job.....
Here You see the Heavy Duty Y pipe from Elite Diesel, along with my Manifolds. I had them Coat them for an extra charge..... I am still waiting on the gaskets.....I will put more pic's up when I get them. But so far,
pretty sweet...can't wait get them on..
sstill.........I simply want a larger ledge for any spent exhaust to get caught as it is trying to be sucked back in to the Head (reversion).......
This is known as a pressure difference between the evacuated cylinder and the exhaust manifold. Suction can cause it, but the pressure difference is a stronger influence.
.....To npccpartman I am not port matching as you can see.That is an attempt to improve flow. I am trying to improve the intake fuel/air cleanliness for a more efficient burn, limiting any spent exhaust from being sucked back into the head....
Improving your flow, evacuates the cylinder more efficiently not only improves your cylinder contamination situation, but, will allow a fresher charge to burn more completely, inturn make more power. Turbulent flow restricts power and hinders complete combustion to put it very simple.
Have you touched anything else besides the manifolds?
Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.
Hello "385seriesHemi"....It's been a while since I have been on forum. Thanks for the very correct and scientific explaination for my Mod. I have not done anymore Efficiency type mods but fall is coming... I did change the intake from stock to a "Volant" With additional Ram Air scoop that draws from the small cavity between the hood and head light on the drivers side. I guess that is also an efficiency improvement?#$%! I am very pleased with the results of my porting/Super Manifold Seal Mod.. Idle has improved to swiss watch steady.Throttle response is right now. The Turbo is getting all available exhaust pressure..(No Leaks) from the crappy metal to metal exhaust to head mating. The result is better acceleration.I have improved the Oil Filtering with a By-Pass Filter System. I kinda Hybridized..( please excuse my made up words).I used Amsoils Filter cap and Filler cap,but I modified a Parker Hydraulic 3 micron Glass media filter to use as the filter.I pieced together the plumbing and fittings from various souces on the web.I will post pictures under a separate thread and other related info look for "Mother of all By-pass Filters for 6.0".The following is a list of future VE mods I intend in order.
Pusher intake manifold.
Flowmaster 4" Stainless Exhaust.
Reconditioned Injectors with 8 hole extrude honed tips.(135cc flr)
Fresh Heads with enlarged exhaust valves/Hard Studs/Black Onyx Gaskets.
Thanks for the interest..I will be more active in the fall..camping now!!
Good job on the manifolds! I know you said you didn't expect much performance improvment but details like this do add up. Now you know one thing that isn't a problem. It's attention to details on stuff like this that make your truck yours.
Thanks alot Axlerod... I do enjoy the Truck and the science. The 6.0 supplies a great "Oppurtunity in Adversity".
Mostly Stock...2005 F-350 2WD Dually 8'BD Crew XLT,Ported & Custom gasketed Ex Man,Custom By-Pass Oil FLTR. Volante Ram Air Intake.Lube all Amsoil,Filtration all Parker Hannifin(Racor),Coolant Chevron ELO.
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