Editing Valve train geometry
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===Chevy small block=== | ===Chevy small block=== | ||
*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 | + | *SBC OEM hydraulic roller pushrods are 7.2” long. When using shorter V6 or L4 OEM roller lifters, start with 7.500" pushrods. |
*Crane retro hydraulic roller- 7.046" | *Crane retro hydraulic roller- 7.046" | ||
*Retrofit roller lifter pushrods are 7.300". | *Retrofit roller lifter pushrods are 7.300". | ||
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Stock pushrod length- 9.130". It has been published that if using Chevy lifters, the pushrod length is 9.290” as a starting point. However, caution must be used if Chevy lifters are going to be tried in a Pontiac engine because the oil band is in a different location. This could effect oiling. There are aftermarket lifters advertised for use in both Chevy and Pontiac engines. These should also be checked but the assumption is that the oil band is correctly located for both applications. | Stock pushrod length- 9.130". It has been published that if using Chevy lifters, the pushrod length is 9.290” as a starting point. However, caution must be used if Chevy lifters are going to be tried in a Pontiac engine because the oil band is in a different location. This could effect oiling. There are aftermarket lifters advertised for use in both Chevy and Pontiac engines. These should also be checked but the assumption is that the oil band is correctly located for both applications. | ||
− | ==Things that can | + | ==Things that can effect pushrod length== |
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''''' | |
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;Hotrodders forum threads<nowiki>:</nowiki> | ;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/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] | *[http://www.hotrodders.com/forum/rocker-arm-199353.html Rocker arm geometry] | ||
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==Tools== | ==Tools== | ||
− | [[File:PUSH ROD 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. | |
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− | Miller | + | |
==Resources== | ==Resources== | ||
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*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 | *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/Category:Adjust_valves Adjust valves]<br><br><br><br><br> | *Wiki page [http://www.crankshaftcoalition.com/wiki/Category:Adjust_valves Adjust valves]<br><br><br><br><br> | ||