: Harland Sharp R.R. removed, stockers put on...big numbers



10secvette
02-26-06, 03:34 AM
I took off the 1.7 HS RR I had on my LSx 408. Put the stock rockers back on... the figures below are rwhp GAINS

RPM RWHP
6,200 + 10
6,300 + 12
6,400 + 19
6,500 + 20
6,600 + 33

Instead of falling over after my 6,200 rpm peak, it now carries.....

Light valve train = power Yes the HS's are lighter as a whole, but not over the valve where it counts.

rand49er
02-26-06, 09:08 AM
WOW!!:bouncy:

Would it be a correct interpretaion to say it's "peaky" at 6,600 RPM? Or, probably more correctly, since this is a comparison to the previous configuration, was it (the RWHP) falling off too fast before at that RPM and now it isn't?

urbanski
02-26-06, 10:05 AM
on your V?

10secvette
02-26-06, 11:04 AM
WOW!!:bouncy:

Or, probably more correctly, since this is a comparison to the previous configuration, was it (the RWHP) falling off too fast before at that RPM and now it isn't?

That's correct.

It's in my vette.

rand49er
02-26-06, 11:40 AM
It's in my vette.Would a similar result occur for the V's LS6?

1MEANV
02-26-06, 11:47 AM
jesel only for my V

verbs
02-26-06, 11:59 AM
I took off the 1.7 HS RR I had on my LSx 408. Put the stock rockers back on... the figures below are rwhp GAINS

RPM RWHP
6,200 + 10
6,300 + 12
6,400 + 19
6,500 + 20
6,600 + 33

Instead of falling over after my 6,200 rpm peak, it now carries.....

Light valve train = power Yes the HS's are lighter as a whole, but not over the valve where it counts.

I'm surprised Harlan's have this problem too! :eek: Everyone in the LSx community including myself used to run Yella Terra rockers years ago (thinking they'd add power because they were lighter), and promptly removed them after realizing they were causing valve float near the redline due to the extra weight on the tip putting too much pressure on the springs. I guarantee you that you had valve float as well. I'd be curious to see a before and after dyno.

10secvette
02-26-06, 12:25 PM
I'm surprised Harlan's have this problem too! :eek: Everyone in the LSx community including myself used to run Yella Terra rockers years ago (thinking they'd add power because they were lighter), and promptly removed them after realizing they were causing valve float near the redline due to the extra weight on the tip putting too much pressure on the springs. I guarantee you that you had valve float as well. I'd be curious to see a before and after dyno.

yep, it was another 11 hour dyno day and I did'nt bother to print the graphs overlayed run to run. Next time I'm up there I'll print them off.

10secvette
02-26-06, 12:27 PM
Would a similar result occur for the V's LS6?

While, my stock LS6 with stock rockers carries the power from around 5,900 rpm to 6,400 rpm. Put a heavy rocker on and it's going to fall off.

austin
09-04-06, 07:03 PM
WOW... Is this the same for the 1.7:1 Yella Terra rockers? I have been reading just the opposite in the corvette forums. The ls6 corvette guys are claiming a dyno run of about 8+ rwhp after the installation of the 1.7:1 Yella Terra rockers.

urbanski
09-04-06, 07:18 PM
you realize the OP is banned right?
may want to begin a new thread.