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Engine Cylinder
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Porting and Polishing Chevy Muscle Car Heads
The heart of your engine is the cylinder heads. A time-honored method for increasing Chevy muscle car horsepower and torque has been improving the air flow potential of the engine cylinder heads. There are many ways to do this; expensive "bolt-ons" such as aftermarket heads, supercharging or turbo charging. For the real gear-head with little money and basic mechanical skills, porting and polishing the OEM heads is always an option.
With just a few key modifications, most heads can be made to flow 5 to 10% better than stock and the effort only requires a few basic tools, patience and a weekend's worth of sweat labor. That's free horsepower! If you are doing a valve job anyway, especially if upgrading to larger valves, this improvement could be in the 20 to 25% range.
The Basic Steps Are:
1. Remove ridges from the intake and exhaust port bowls; this is formed when the valve seats are cut and once the heads are disassembled you can easily feel it with your finger; it's in the head just below the seat. Blend the ridge into the port walls using a carbide burr with a ¼ inch die grinder. A variable speed grinder and a light touch are best. Be very careful that the shank of the burr does not come in contact with the valve seat. Remove as little material as possible.
The entire port should feature a continuous smooth radius. The valve guide bosses can also be cleaned up but be sure to leave .125 of material surrounding the valve guide hole. You can use abrasive rolls to polish the exhaust ports but do not polish the intake ports. With the intakes, too smooth and you lose the turbulence needed to thoroughly mix the gas and air being pulled into the combustion chamber.
2. Unshroud the valves by gently removing material from the sides of the combustion chambers. Match the head gasket with the bolt and dowel-pin holes in the head and then scribe a cylinder-bore line around the chambers. Using machinist bluing or a dark felt tip marker will make the scribe line easy to see. You then know how far you can safely grind but do not go outside the scribe line or serious sealing problems may result. Again, remove minimal material to avoid reducing the compression ratio. Use some old valves in the chamber to protect the seats while grinding. You can also polish the chambers with abrasive rolls; it will reduce the tendency for carbon buildup.
3. Port match the intake runners to the intake using the intake gasket as a template for a scribe line. Some say this is worth 4% more CFM, 2% is more likely, but every little bit helps. Do not polish the intake runners or fuel puddling and loss of flow turbulence could result - leave them a little rough.
Tools Needed:
o Variable speed die grinder with 25,000 rpm potential; an air grinder is ok but an electric with variable speed control seems easier to modulate
o Carbide burrs; 1/2 inch head and some smaller sizes for tight spots all with 2 inch long shanks
o Abrasive rolls (basically medium to fine grits, try to stay below 1/2 inch diameter)
o Leather gloves
o Ear plugs
o Eye protection
o Dust mask
o Duct tape (wrap the grinder tightening nut and tape around the combustion chamber scribe line just in case); running a burr across an unprotected head surface will ruin your whole day - the duct tape offers a little extra protection.
Key Learning: A valve job will be needed after this process because I have never seen anyone port and polish heads without nicking at least a few of the valve seats, no matter how careful they were - so plan accordingly.
Your chevy muscle car can really benefit from this "sweat labor" modification. Do this right and you can feel the added power and torque in the seat of your pants - improves gas mileage too! For additional information and photos click on this link: Chevy Power.
by Tom McGuire
The Ford 6.0 Liter Power Stroke Diesel Engine by RJ Performance
The new Ford 6.0 Liter Power Stroke Diesel Engine has 325 maximum horsepower output. This is adding an additional 100 horsepower to its previous version along with 560 foot poundage torque. This is one of the most innovative and new products on the market. Keep in mind that the Power Stroke “name” has been used for quite awhile, however, the 6.0 Liter Engine is brand new and has many new unique options and features.
The Ford 6.0 Liter Power Stroke Diesel Engine by RJ Performance is an electronically controlled, directly injected diesel engine. The meaning of a Direct Injection is that of the gas being injected directly into the engine cylinder. This makes it different from the type that must go through a pre-combustion chamber externally to the engine cylinder utilized on other diesel engines.
As with any new technology upgrade, there can be drawbacks. The major drawback of the Ford 6.0 Liter Power Stroke Diesel Engine by RJ Performance is the oil that must be used. It has to have the exact type of oil that it calls for otherwise it may foam up as it is going through the injector. This can cause a lot of hand starting and running rough.
Of course there are numerous other features of the Ford 6.0 Liter Power Stroke Diesel Engine that makes the performance amazing. These features can include:
- A Variable Vane Turbocharger.
- An Air to Air Intercooler.
- A Four Valve per Cylinder Head Design.
The Ford 6.0 Liter Power Stroke Engine is a modernized diesel that gives out the clean power and performance that we seek each day for a sophisticated work vehicle. This allows its buyers to own a diesel with the same type of level of comfort you would have if utilizing a normal gas engine.
The one major drawback to upgrading in new technology is the replacement cost, Costs to replace parts or costs to repair oil issues that can happen with the turbo. These problems can cause entire engine failure if they are not properly serviced.
RJ Performance offers a very cost efficient alternative to buying an engine directly from a dealer or trying to find the parts to do a rebuild of these types of engines.
The engines purchased from RJ Performance include the following:
- Turbo.
- Complete Fuel System and Injection System.
- E.C.U. which is mounted at engine top.
- Manifolds.
- Oil Pan and Valve Covers.
- Internal and Engine Components.
The engines purchased from RJ Performance do not include the following:
- Wiring Harness.
- Alternators.
- Starter.
- Power Steering Pump.
For more information including pricing and warranty information, visit - http://www.rj-performance.com
About the Author
RJ Performance was founded in 1998 and has grown into one of North America’s premier medium and light duty diesel engine and component suppliers. We import manufactured products from more than 10 countries. Our goal is to provide you with exceptional Parts for exceptional prices.
Can a 4 cylinder engine hadle a 4 wheel drive Toyota Tacoma; or is it necesary to have a V6 in a Tacoma?
I am buying a 4 wheel drive Tacoma and i am considering the 4 cylinder engine. I was wondering if the 4 cylinder engine can preform properly or is it necesary to have a V6 on a 4 wheel drive truck, such as a Toyota Tacoma?
Do you tow and or haul alot? Do you drive in a very hilly area? If yes get the v6, its not gonna be that much worse on gas but will give you more torque and horsepower than the 4. If no then get the four, it will be good on gas, plus you can still carry some stuff like lawn equipment or dressers, just dont tow a '69 impala up a 1 mile straight up hill!
FPT 1.4 Multiair Turbo Engines Win the Prestigious "Engine Of the Year" Award
AUTO CENTRAL – June 28, 2010: The Fiat Powertrain Technologies (FPT) 1.4 Turbo engines, the first to incorporate revolutionary Multiair technology, won the prestigious “Engine of the Year” award in the best new engine of the year category.
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