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RB26 Block Filler rigidity/deflection test

Triple OG

By Triple OG,
in Engines & Forced Induction

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Triple OG Rookie

Triple OG

Posted
Posted

I had some time over the last week  and decided to test if block filler will hold the blocks shape similar to a torque plate after the head has been removed. 1, 3 and 5 were measured at 9 points each before and after. MY goal was to see how much impact a torque plate has on the shape of the bore.

The first set of measurements were taken with the main girdle and head off with no filler. The block was then filled with grout up to the water pump (half fill) and the girdle and head were torqued to spec. The block sat leveled for 7 days and was disassembled. The second set of measurements were then taken.

Results are presented as the delta between the original and new value. All values in the PowerPoint are presented in inches because America. The largest changes were 0.0035 in or 0.0889 mm between cylinders 3 and 5. There may have been even greater changes if the block was filled to the top with grout.

I hope this information is useful and I'm curious to hear what you guys think.

 

 

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Notes:

My block had the most wear in cylinders 3 and 4. Due to the amount of change in 3, I measured 2, 4 and 6 separately. 4 was also all over the place. 6 was similar to 1. They were not included to keep the test objective.

 

 

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GTSBoy Grand Master

GTSBoy

Posted
Posted

I think you'll find we're confused about what you were trying to do and how you were doing it.

I would have thought that block rigidity was something you measured while loading the block in beam or in torsion, and that you would do so before and after grout filling, to see if putting material in there created a "composite" construction with the expected rigidity increase. Notwithstanding that the true function of grout is less about gross rigidity than local (ie preventing bore deflection/splitting and tying the bores to the main bearing locations a little better, etc etc).

It is nearly impossible to follow your description of what you've done without closing ones eyes and making "aliens" hand shapes in front of oneself to try to follow the manipulations you've made.

It's still unclear to me what you were trying to prove.

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      I think you'll find we're confused about what you were trying to do and how you were doing it. I would have thought that block rigidity was something you measured while loading the block in beam or in torsion, and that you would do so before and after grout filling, to see if putting material in there created a "composite" construction with the expected rigidity increase. Notwithstanding that the true function of grout is less about gross rigidity than local (ie preventing bore deflection/splitting and tying the bores to the main bearing locations a little better, etc etc). It is nearly impossible to follow your description of what you've done without closing ones eyes and making "aliens" hand shapes in front of oneself to try to follow the manipulations you've made. It's still unclear to me what you were trying to prove.
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