$ 800 to Extrude Hone an Exhaust Manifold

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Yup, Thats the estimate I got from http://www.extrudehone.com/exhnpwfl.html

$300 to do a turbo exhaust housing. Even thats alot. $100-150 I might have tried it.

For what little we may gain, this is way to much money.

We all ought to pitch in a buy or build a **** extrude honing machine!


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Bill R
94 2500 SLT 4x4 5 Speed, 3. 54 LS, JRE 4" exhaust, Autometer Pyro, Boost & Water temp gauges, Bosch 215 HP injectors, Timing @ 14. 7 º, JRE Stage III #4 plate 270/675, AFC spring kit, Scotty Air, Bully Dog Propane Injection, Roadmaster Active Suspension, Optima Red Tops, Geno`s Exhaust Blanket,Espar Heater (won it!), Synthetic lubes throughout.



[This message has been edited by HEMI®Dart (edited 12-15-2000). ]

 

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I've posted this previously:

when I worked at Garrett we tried Extrude hone on a couple compressor housings. There was no difference between the before and after tests. The compressor maps were the exact same.

The very small improvement you would make in pressure drop due to improved surface finish is in the noise when compared to the pressure drop due the geometry of the manifold. Remember, we're dealing with a boosted engine & if there were big, cost effective power gains to be made by using swoopy intakes & exhausts then Cummins/Dodge would already be doing it. It's just not cost effective for 99. 5% of the population - HVAC and his disciples account for the . 5% #ad


Brian

 

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AMEN brutha!!! #ad
I got yelled at when I stated that the swoopy intakes such as the twin ram are IMO misapplied naturally aspirated thinking processes. My intake pressure is held to less then 50 psi to protect the turbo, but even at 20 psi I feel that porting and polishing will not net the same effect on a pressure fed motor as compared to a naturally aspirated motor.

Save yur money! #ad

 

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There is some hp to be had by porting. Just do most of the work on the exh side. It,s easy to shove it in the cylinders,but it,s hard to pull it out.

 

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We extrude honed the living heck out of the head, intake and exhaust manifold of the Auto Wurks Diesel racer, but I honestly believe that the 16 week wait was far too long to pay such a significant amount of money. I believe that there was a 2-5% power increase if even that. With their turnaround time on one of these diesel heads, we almost missed the entire racing season. #ad


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Chris Timochko
AUTO WURKS DIESEL R&D TEAM
1997 5sp 4X4, Espar Heater, A. W. D. HX40 turbo, ATS 3pc Manifold, BD 4" Brake, Marine Compression, A. W. D. Custom Tuned Injection Pump, A. W. D. Intercooler, A. W. D. 370B Injection Nozzles, Delivery Valves, Governor & AFC Spring Kit, Psychotty Air, A. W. D. Water Injection, NOS Diesel Kit, A. W. D. 6" Chrome Exhaust System, BD No Smoke Valet Switch, McLeod Dual Disc Clutch, Mag-Hytec Rear Cover, Cummins Chrome Kit, Optima Red Tops, Hadley Bully Horns, Hurst Line Loc, Goodyear Wrangler AT/S 305/70/16s.

 

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sport bike, THAT'S EXACTLY WHAT I DID to my new ATS exhaust manifold and Banks 14 cm2 turbine housing. I also had both ceramic coated, inside and out by Performance Coatings, Inc. in Auburn, WA.

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John,

Thats probably what I`m going to do to. Just exhaust side work. Intake side is a waste of time. Did your Jet Hot coating seem to smooth out the inside of the turbo housing?

See my post "Turbo Exhaust Housing Porting Question"

 

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Hemi, just read the porting thread.

I ported the inlet side of my Banks 14 cm2 turbine housing to match the enlarged outlet ports of my ATS exhaust manifold. I also ported the inlet of each ATS exhaust manifold port, porting close to gasket matching. . (and yes, I saw Joe D. 's remark). As I have ported and polished numerous heads and exhaust manifolds (+ intake manifolds) as well as doing die work with a die grinder for many years, the finish I left on the casting surface was very close to most polishing jobs. The surface prep. prior to ceramic coating was sand blasting using 100 grit sand (very fine... looks like a glass beaded gun barrel). After which, the turbine housing and ATS exhaust manifold were ceramic coated (inside and out... 2000 degree matte black), the area I ported looked like (for the most part), better than a 32 u/m to around a 16 u/m finish. In other words... SWEET!

 

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HVAC,
I wouldn't quite say it's mis-applied - just not cost effective for a non-race engine. Reducing losses is a good thing - you just don't see as much benefit on a boosted engine.

the turbocharged roundy-round cars (F1, Indy, CART - whichever one it is) use swoopy intakes & exhausts because they are looking for every last advantage they can get.

Brian