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If you realize you have an issue with the rod bearings contacting the crank fillet, you have two options. The first is to purchase a narrower set of rod bearings. Look for a set of high-grade performance bearings. Or, if you want to keep the set of bearings you have, you can use a bearing scraper to cut a chamfer into the outside edges. Check for Valve Control If you are performing an engine rebuild and your engine is equipped with roller-tipped rocker arms, there is an easy check to make sure your valvetrain is staying under control.
Unlike flat tappet lifters which are designed to spin, valves should not. Valve bounce will not only damage both the valve and the seat, but it also kills power by bleeding off compression. When rebuilding your motor, check the valve stem tips for signs of valve bounce. If the valve is bouncing on the seat, the spinning motion that it creates will cause the rocker tip to leave a star pattern on the tip of the stem.
At minimum, check the valve and seats in the cylinder heads for damage. You probably will also need to go with stiffer springs, reduce your rocker ratio, switch to a milder cam or do something else to protect your valves the next time around. Lifters are one component you might think you can take out of the box, wash off and throw into the engine, but they too require a more thorough check than that-especially if you are trying to save some money with a cheaper brand.
A Chevy small-block lifter is 0. If the lifter sticks in the bottom of the bore, it will tear up the corresponding camshaft lobe and send shards of metal through the engine. If it sticks in the top of the bore, it will force the valve open and the next time the piston approaches the top of the bore the valve and piston will be introduced in a manner that was never intended.
If you are lucky, it will just bend the valve before you shut down the engine. But if the head of the valve breaks off you can have some serious damage before the driver is able to hit the kill switch.
After all, if you find yourself and your car in the tech shed, you are the one responsible for everything the inspector finds. Checking the combustion chamber volume in your cylinder heads will allow you to dial in the exact compression ratio you want for your engine.
Also, if your track has a compression rule, or a minimum chamber size rule, your ability to accurately measure chamber volumes can help you get right up to the line for maximum power without breaking the rules.
A kit for checking chamber volumes is available from Powerhouse Tools as well as lots of other sources. Hobby level kits are inexpensive, easy to use, and accurate.
And they can help you get a leg up on the competition. Timing Chain Clearance This one is Chevy-specific, but since the vast majority of racers in the Street Stock levels are running Chevy small-blocks, we decided to go with it.
Stock engines use a single-width timing chain, but for improved durability and timing stability most racers prefer to use a double timing chain setup the chain is two links wide. This upgrade is so valuable in terms of helping engines stay together and endure the abuse of racing that double-row timing chain sets are legal almost everywhere.
The solution is simple: Watch the Pickup In most cases, whenever you purchase a racing oil pan, the manufacturer also offers a pickup designed expressly to work with it.
Any less clearance and you run the risk of the pan pulling up and blocking off the inlet, any more and you can potentially have oil slosh away from the pickup and introduce air into the system-definitely a bearing destroyer.
You can check the distance by installing the pickup into the oil pump and the oil pump on the block. Lay a straightedge level across the bottom of the pickup and measure from the straightedge to the oil pan rail on the block in a line perpendicular to the oil pan rail. Now lay the same straightedge across the oil pan in the area where the pickup will be and measure from the edge of the straightedge straight down to the bottom of the sump of the oil pan.
If not, you will need to adjust the pickup location and try again until you get the clearance you are looking for. Facebook Twitter Google Plus Email. Related Videos EFI vs. If Accessories Could Kill
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