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Discussion Starter · #1 ·
Searched the net but could not find what Im looking for so...... Does anyone have a short video of a bbf rocker arm and pushrod in motion? Preferably at cranking speed.
 

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HI they all work the same so it doesn't really matter if it BBF or SBC. You should be able to google it. But it goes
push rod goes up pushing on the back of the rocker so valve tip of rocker goes down on the valve spring .. push rod goes down at the back of the rocker and the tip of the rocker goes up off of the valve spring.. Regular simple fulcrum operation one end goes up the other end has to go down..

good luck take care be safe
tim
 

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This is not correct. Ford is a bit more complicated to get the proper angles so you don't wear things out prematurely.
HI Sure it is ... You are talking about the geometry ,, they all need the proper geometry to not ware things out.. But he just asked how they operate and that's what I showed.

good luck take care be safe
tim
 

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Discussion Starter · #6 ·
HI Sure it is ... You are talking about the geometry ,, they all need the proper geometry to not ware things out.. But he just asked how they operate and that's what I showed.

good luck take care be safe
tim

😂 I am looking for a video of an assembled bbf rocker arms / pushrods in motion at cranking speed not how they operate.....
 

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HI, That's going to be hard.. it would be an oily mess and splatter oil everywhere. What are you looking for in particular. I have seen some on You tube they show the spring spinning and such.. the the operation is still the same. other than you can get valve float at high rpm's and over compression of the valve spring..

good luck take care be safe
tim
 

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Discussion Starter · #9 ·
I am interested in seeing if the pr motion is straight up and down or do others have a bit of side to side motion as mine does. Side to side meaning cross car. This would be best seen while cranking not running.
 

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Discussion Starter · #11 ·
The whole internet and could not find one so I made it myself. Notice the somewhat of an arc motion the pr makes? Is this normal or is there a problem?

 

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In cases where the length of the push-rod renders it NOT parallel to the rocker arm stud the tendency to side load the rocker arm is exaggerated.
A good example is the short push rod required by a hydraulic roller lifter.

A look at the relationship between the pushrod cup in the lifter and the pushrods' angle relative to same explains this tendency for some wasted side motion.

I've also seen rocker arms in which the hole in the trunion for the rocker stud is not perpendicular to the roller tip OR the trunion axle. This leaves a cockeyed contact pattern on the valve stem tip.

The short answer is yes this is normal and partially explains some of the clicking noise one hears in the valve train.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
 

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Discussion Starter · #14 ·
In cases where the length of the push-rod renders it NOT parallel to the rocker arm stud the tendency to side load the rocker arm is exaggerated.
A good example is the short push rod required by a hydraulic roller lifter.

A look at the relationship between the pushrod cup in the lifter and the pushrods' angle relative to same explains this tendency for some wasted side motion.

I've also seen rocker arms in which the hole in the trunion for the rocker stud is not perpendicular to the roller tip OR the trunion axle. This leave a cockeyed contact pattern on the valve stem tip.

The short answer is yes this is normal and partially explains some of the clicking noise one hears in the valve train.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
In cases where the length of the push-rod renders it NOT parallel to the rocker arm stud the tendency to side load the rocker arm is exaggerated.
A good example is the short push rod required by a hydraulic roller lifter.

A look at the relationship between the pushrod cup in the lifter and the pushrods' angle relative to same explains this tendency for some wasted side motion.

I've also seen rocker arms in which the hole in the trunion for the rocker stud is not perpendicular to the roller tip OR the trunion axle. This leave a cockeyed contact pattern on the valve stem tip.

The short answer is yes this is normal and partially explains some of the clicking noise one hears in the valve train.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine
Didn’t think it was to big of a deal but it’s nice to have someone else confirm. Thanks for the feedback
 

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1990 Ford Mustang LX 351M powered!! Project Cherry Bomb!!
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In cases where the length of the push-rod renders it NOT parallel to the rocker arm stud the tendency to side load the rocker arm is exaggerated.
A good example is the short push rod required by a hydraulic roller lifter.

A look at the relationship between the pushrod cup in the lifter and the pushrods' angle relative to same explains this tendency for some wasted side motion.

I've also seen rocker arms in which the hole in the trunion for the rocker stud is not perpendicular to the roller tip OR the trunion axle. This leave a cockeyed contact pattern on the valve stem tip.

The short answer is yes this is normal and partially explains some of the clicking noise one hears in the valve train.








Scotty J. "AKA" The "Mad Porter"
"EMC 2006" 3rd place finisher
Ported BBF iron head specialist & Aluminum heads from all sources.
Custom ground cams
See our products in the Vendor for sale section
Customized crate engines
ParklandAutoMachine.com
R-H-P.biz
"Parkland Performance Auto Machine" Formerly RHP
(253)-988-6648
Parkland Auto Machine

I think my head just exploded...... I'm gonna have to do a few mock-ups on mine to check all this just to see if I'm gonna need to order different sized pushrods... 97 short block, 560/580 lift cam, D0VE heads.. will the rockers make a difference? I was gnna mock up w stock cast rockers but I wanna use rollers when I finish the build... Under regular tin valve covers if I can...
 
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