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The goal in rebuilding an engine is to return its performance and reliability to what it once had new. The goal in “building” an engine is to increase its power within the capabilities of that engine without unduly ruining its other performance factors — drivability, mileage, reliability, and perhaps smog-law compliance.
Building a performance engine is not just a matter of tossing “speed parts” like a big cam into it, nor is building high performance or racing engines anywhere near as simple as some people imagine. Change one thing and that’s a different engine. Change many things and you have entered another profession, as an engine developer.
The package of professional skills you acquired as a rebuilder still apply to building high performance engines, whether for yourself or for customers. But a few advanced skills must also be acquired (or rented). So must further, up-to-date insights, for making effective decisions long before the first cutting edge touches iron. Then knowledge is power.
The topic of engine performance is enormous, and enormously complicated. So one article can lead only so far. We try the possible. The May 2004 issue of Shoptalk carried my article entitled “Camshafts” that covered the basics of how engines operate across six working cycles, how cam designs affect those cycles, and some recommendations. This article looks for a moderate but real increase in power to a production engine that must run well at reasonable rpm on pump gas.
The goal in rebuilding an engine is to return its performance and reliability to what it once had new. The goal in “building” an engine is to increase its power within the capabilities of that engine without unduly ruining its other performance factors — drivability, mileage, reliability, and perhaps smog-law compliance.
Building a performance engine is not just a matter of tossing “speed parts” like a big cam into it, nor is building high performance or racing engines anywhere near as simple as some people imagine. Change one thing and that’s a different engine. Change many things and you have entered another profession, as an engine developer.
The package of professional skills you acquired as a rebuilder still apply to building high performance engines, whether for yourself or for customers. But a few advanced skills must also be acquired (or rented). So must further, up-to-date insights, for making effective decisions long before the first cutting edge touches iron. Then knowledge is power.
The topic of engine performance is enormous, and enormously complicated. So one article can lead only so far. We try the possible. The May 2004 issue of Shoptalk carried my article entitled “Camshafts” that covered the basics of how engines operate across six working cycles, how cam designs affect those cycles, and some recommendations. This article looks for a moderate but real increase in power to a production engine that must run well at reasonable rpm on pump gas.
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