Valve train geometry
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==Overview== | ==Overview== | ||
Valve train geometry is an important aspect of building a performance engine. If done correctly, having the correct geometry will increase power and reliability. | Valve train geometry is an important aspect of building a performance engine. If done correctly, having the correct geometry will increase power and reliability. | ||
==Measuring a pushrod== | ==Measuring a pushrod== | ||
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Overall or "actual" length doesn't always equate to the pushrod length as specified by the manufacturer, odd as this sounds. The difference is in whether the pushrod was measured by overall or actual length (longest measurement of the three), "theoretical" length (about 0.020" longer than actual length) or "gauge" length (longest of the three). | Overall or "actual" length doesn't always equate to the pushrod length as specified by the manufacturer, odd as this sounds. The difference is in whether the pushrod was measured by overall or actual length (longest measurement of the three), "theoretical" length (about 0.020" longer than actual length) or "gauge" length (longest of the three). | ||
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===Chevy small block=== | ===Chevy small block=== | ||
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*Stock hydraulic flat tappet SBC- 7.8” | *Stock hydraulic flat tappet SBC- 7.8” | ||
*SBC OEM hydraulic roller pushrods are 7.2” long. When using shorter V6 or L4 OEM roller lifters, start with 7.500" pushrods. | *SBC OEM hydraulic roller pushrods are 7.2” long. When using shorter V6 or L4 OEM roller lifters, start with 7.500" pushrods. | ||
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===Pontiac V8=== | ===Pontiac V8=== | ||
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Stock pushrod length- 9.130". If using Chevy lifters- 9.290”. | Stock pushrod length- 9.130". If using Chevy lifters- 9.290”. | ||
==Things that can effect pushrod length== | ==Things that can effect pushrod length== | ||
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A large number of variables are involved in determining the correct length pushrod for your application. Pushrod length is affected by any of the following: | A large number of variables are involved in determining the correct length pushrod for your application. Pushrod length is affected by any of the following: | ||
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==Mid lift theory of valve train geometry== | ==Mid lift theory of valve train geometry== | ||
| − | + | *[http://www.aera.org/ep/downloads/ep10/EP04-2010_20-30.pdf Miller Mid-Lift] and rocker geometry article in the AERA (Automotive Engine Rebuilders Association) quarterly magazine '''''Engine Professional''''' | |
| − | + | ;Hotrodders forum threads<nowiki>:</nowiki> | |
| + | *[http://www.hotrodders.com/forum/mid-lift-rockers-206836.html?highlight=MID+LIFT+MILLER Miller mid lift rocker theory] | ||
| + | *[http://www.hotrodders.com/forum/rocker-arm-199353.html Rocker arm geometry] | ||
==Tools== | ==Tools== | ||
[[File:PUSH ROD LENGTH CHECKING TOOL 002.jpg|thumb|left|200px|Homemade adjustable pushrod length checking tool]] | [[File:PUSH ROD LENGTH CHECKING TOOL 002.jpg|thumb|left|200px|Homemade adjustable pushrod length checking tool]] | ||
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| + | Miller used a MID-LIFT G-TooL to measure for geometry. It is quite different from the other devises on the market like from Comp Cams and others that are used to estimate pushrod length. | ||
==Resources== | ==Resources== | ||
| + | *Circle track article ''[http://www.circletrack.com/techarticles/ctrp_0611_rocker_arm_valvetrain_geometry/viewall.html Rocker Arm Geometry And Valvetrain Alignment], A Detailed Explanation Of Valvetrain Alignment Goals'' by Bob Bolles, from February, 2009 CT mag | ||
*Lunati article [http://www.lunatipower.com/Tech/Valvetrain/HowToVerifyValvetrainGeometry.aspx How to verify valve train geometry] | *Lunati article [http://www.lunatipower.com/Tech/Valvetrain/HowToVerifyValvetrainGeometry.aspx How to verify valve train geometry] | ||
*Wiki page [http://www.crankshaftcoalition.com/wiki/Valve_train_points_to_check Valve train points to check] | *Wiki page [http://www.crankshaftcoalition.com/wiki/Valve_train_points_to_check Valve train points to check] | ||
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[[Category:Engine]] | [[Category:Engine]] | ||
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[[Category:Cylinder head]] | [[Category:Cylinder head]] | ||
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