HYD ROLLER GEOMETREY SET UP PROCESS

[siuauto]

I am building my first hydraulic roller engine and I am curious to know what procedure to use to determine pushrod length and correct geometry. In the past on a hyd flat tapped, I made a mock up lifter and set it to the preload spec and a adjustable pushrod to get my length and to check the geometry. I am using Howard cams rollers. It doesn't look like they sell a single lifter for me to make a mock up. I thought I could use lightweight valve springs and just use the lifters?

What process do you all use?

 

[JoePole1]

 

[Demonracer]

Adjustable rockers or stamped steel rockers?

 

[siuauto]

Adjustable rockers or stamped steel rockers?

Adjustable

 

[Garrett Ellison]

Read this and email Mike for further directions.
B3 Racing Engines LLC - Mopar Rocker Arm Geometry Tech

 

[MOPAROFFICIAL]

Adjustable

Shaft mount heads...
The geometry relation between rocker and valve is set on it's own by stem height and or moving the shaft with shims or a b3 geometry kit. The pushrod length can then be mocked and figured out once the rocker pivot point is locked in... at that time I would set all adjusters up so that you have either 2 threads above the lock nut and 3 below or at least and even number of threads exposed both top and bottom of rocker... then extend the pushrod itself to apply the correct preload to the lifter cup...
That way the adjuster it locked in with central adjustability and the p.r length is all that's variable to adjust.

So get an adjustable push rod and check cyl 1 , 7,2,8

 

[Demonracer]

When I measured for my pushrods, I checked all of them to make sure.

 

[MOPAROFFICIAL]

When I measured for my pushrods, I checked all of them to make sure.

The only variables you can be speaking of.... is if the lifters were not all manufactured the same, or the lobes were not all ground the same/the base Circle.. and or the stem heights are not equal and therefore you might want to check your geometry/aka start over... because you've already f***** up by not fixing it. LOL just hypotheticals

 

[siuauto]

Read this and email Mike for further directions.
B3 Racing Engines LLC - Mopar Rocker Arm Geometry Tech

Thanks for sending. This helped with a big piece of a puzzle I am trying to solve. The heads that I bought from a guy are a set of speedmasters and it came with 1 rocker shaft and what I now know as the B3R Geomatry kit. He told me he broke a rocker shaft and I now can see why from the picture. Is oblonging the rocker hold down bolts part of this process? Also it looks like the kit has oblong holes too. I think I know the answer but I would like to confirm.

 

[Garrett Ellison]

The closest I've gotten to seeing them in person so far is emailing Mike and getting the directions for measuring at this time. Yes, the holes have to be drilled oblong in the shafts depending upon the amount of correction needed. I would like to think in cases where they have to be offset that there would be a lug in the mounting blocks that seats in the original bolt hole location in the shaft to act as a space filler and limit both torsional movement and flexing. I would at least email him and ask him for his opinion and input here and let us know what he says.

 

[CRUZE 418]

It's been a year since I did mine, but those half shells only go in one way, can't explain it, but Mike can. Isn't that the oil feed hole in the picture?

 

[Bewy]

This is a drawback of a shaft rocker system. If the shaft needs to raised to correct geometry, no problem by using shims. If the shaft needs to go down......

 

[siuauto]

It's been a year since I did mine, but those half shells only go in one way, can't explain it, but Mike can. Isn't that the oil feed hole in the picture?

In the second pic it just the oil feed but that pic is to show the oblong on the spacers. The first pic shows the oblong mounting holes