H-I-J '76 Nova re-fit.

Dissident · 03-22-2019, 11:26 PM

Todd,
Being a data kind of guy, I ran some quickie calculations for the potential flow (internal leaks) of the EDM lifters and the groove thing in the lifter bores. I used 50psi as that is the pressure number you mentioned.The EDM lifters will flow approx 0.0371gpm (each) at 50psi. The grooves in the lifter bores will flow approx 0.264gpm (each) at 50psi. Doesn't sound like much until you toss in each number times the 16 leak paths. Total flow at 50psi = 4.8176gpm! WOW.

At that rate of flow, 5qts (1.25gal) will cycle very quickly. The grooves themselves go through 4.224gpm so I suspect that is the major offender and caused the earlier ugly bearings. Seems like the grooves need to be rendered useless, but I suspect that your engine shop guys have already suggested that.

I realize that I might be full of soup in this assessment, but I think it is very close to the correct analysis.

Best of luck solving the problem.

Regards,
HB2

Dissident

03-22-2019, 11:26 PM	#11
Dissident Member Join Date: Jan 2016 Location: Colorado hills Posts: 123 Likes: 11 Liked 73 Times in 36 Posts	Re: H-I-J '76 Nova re-fit. Todd, Being a data kind of guy, I ran some quickie calculations for the potential flow (internal leaks) of the EDM lifters and the groove thing in the lifter bores. I used 50psi as that is the pressure number you mentioned.The EDM lifters will flow approx 0.0371gpm (each) at 50psi. The grooves in the lifter bores will flow approx 0.264gpm (each) at 50psi. Doesn't sound like much until you toss in each number times the 16 leak paths. Total flow at 50psi = 4.8176gpm! WOW. At that rate of flow, 5qts (1.25gal) will cycle very quickly. The grooves themselves go through 4.224gpm so I suspect that is the major offender and caused the earlier ugly bearings. Seems like the grooves need to be rendered useless, but I suspect that your engine shop guys have already suggested that. I realize that I might be full of soup in this assessment, but I think it is very close to the correct analysis. Best of luck solving the problem. Regards, HB2 Dissident