High revving combos
10-04-2010, 10:24 PM
#41
Depends on the springs, single beehives can be anything, mine are the Ebay springs(beehive) that have good seat pressure and i roll to 7100 RPM all day with the Trex cam and stock rockers, so if you have anything like i do, then your are bulletproof to 72000.
10-05-2010, 04:24 AM
#42
i've heard of PRC springs being very good, and lots of 918s failing but not many people using the 916s i am using, no known failures i read of.
have seen the threads about the needle bearings falling out so tempted to do the trunion upgrade over winter.
my last engine was a used ls1 that span a bearing and trashed itself so this LS6 needs to last. All that was salvageable were the heads which went on my new block. the actual use of the car is minimal, less than 1000miles a year but its all on track use and thrashed hard to the rev limit continually. I do warm it up fully though and it gets good oil changes regularly. My concern is a dropped valve from a spring fail or needle bearing fail!
10-05-2010, 11:10 AM
#43
Well, i dont know the specs of those springs, but i have several friends turning the stock bottom end LS1/2/6/LQ4/9 and what not to 71000, but there are some that have issues, just no one i know, a friend had a lifter fail a couple months ago, other than that, stock rockers and all, kicking hard.
10-05-2010, 03:44 PM
#51
TECH Junkie
iTrader: (12)
Join Date: May 2002
Location: Burleson/Ftw,Texas
Posts: 3,420
Likes: 0
Received 0 Likes
on
0 Posts
My question is do you guys have dyno graphs showing what RPM's u guys are making power at to rev your engines to such extremes or are u doing it cause u can?
10-06-2010, 10:25 AM
#53
fair point, mine peaked at 6300 on the dyno and i cant see the point of revving more than a couple of hundred rpm past that on mine, keeping it in the power band in upshifts is usually the change point.
10-08-2010, 06:18 PM
#56
I run my stock LY6 to 7000rpm. It has patriot gold .660 lift dual springs, stock pushrods, stock rockers. power peak is somewhere around 6300, but that happens fast in first gear with 4.56's lol. seems to run the fastest trap speed shifting at 6800. I plan on rocker/pushrod upgrades over the winter, maybe a bit more cam, and wring it out a little further - see if i can squeek out a 10.9x.
Barrett
Barrett
Last edited by 3pedals; 10-08-2010 at 10:57 PM.
10-15-2010, 10:42 PM
#57
Listen to this...the camera mic does not do justice....
http://www.youtube.com/watch?v=hZyjRvUErZQ
car spun hard out of 1st....
The average piston speed on this combo at 9200 is less than the stock LS engines at 7200.
With a rod/stroke of 1.92 there should be little side loading of the piston.
The oil pump is an external 12gpm unit driven at .57 crank speed, oiling is not a problem.
Makes around 2hp/cube.
Dave
http://www.youtube.com/watch?v=hZyjRvUErZQ
car spun hard out of 1st....
The average piston speed on this combo at 9200 is less than the stock LS engines at 7200.
With a rod/stroke of 1.92 there should be little side loading of the piston.
The oil pump is an external 12gpm unit driven at .57 crank speed, oiling is not a problem.
Makes around 2hp/cube.
Dave
10-16-2010, 08:17 AM
#58
It is a little louder sitting here..
http://www.youtube.com/watch?v=oOxGFPoOHkg
I found the A/F to be lean on these runs almost 15/1.
and the squirter is not sufficient with only a 1.45 60.
stay tuned for the next outing
Dave
http://www.youtube.com/watch?v=oOxGFPoOHkg
I found the A/F to be lean on these runs almost 15/1.
and the squirter is not sufficient with only a 1.45 60.
stay tuned for the next outing
Dave
