Can I run a stock LS1 at 6800rpm?
#1
Can I run a stock LS1 at 6800rpm?
I have a '99 C5 Coupe w/LS1. The engine has 103k miles and has been extremely reliable and runs great. The car is a 6 speed with a 3.73 rearend, aluminum flywheel and pressure plate. I really enjoy the setup, it's very responsive and has enough power for now. The motor is completely stock. I run about 14 - 20 track days a year and have been doing it for 2 years now. I have coilovers, larger front and rear adjustable sway bars and run DOT tires at the track.
My problem is that as my driving has improved, I find myself at the rev limiter (6200) all the time and having to shift early or hang at the limiter for a few hundred yards. Most of the time at Watkins Glen this means 5th gear which is too high to pull the hill.
What I would like to do is bump my rev limit up to 6800 but I'm concerned about the valve train and rod bolts. I don't want to redo the entire top end. My plan right now is to change push rods, valve springs, seals and maybe retainers. Then replace the rod bolts with ARP's
I'm looking for recommendations on springs.
Also can you just take out the factory rod bolts and install the new ones without doing anything else? Can you just drop the oil pan and do this in the car?
I'm going to be leaving the motor stock except for these changes.
Any other advice of things to consider would be GREATLY appreciated.
Thank you in advance.
My problem is that as my driving has improved, I find myself at the rev limiter (6200) all the time and having to shift early or hang at the limiter for a few hundred yards. Most of the time at Watkins Glen this means 5th gear which is too high to pull the hill.
What I would like to do is bump my rev limit up to 6800 but I'm concerned about the valve train and rod bolts. I don't want to redo the entire top end. My plan right now is to change push rods, valve springs, seals and maybe retainers. Then replace the rod bolts with ARP's
I'm looking for recommendations on springs.
Also can you just take out the factory rod bolts and install the new ones without doing anything else? Can you just drop the oil pan and do this in the car?
I'm going to be leaving the motor stock except for these changes.
Any other advice of things to consider would be GREATLY appreciated.
Thank you in advance.
#2
The 99 rod bolts aren't as strong as the later year rod bolts. Might want to keep that in mind. Changing the bolts would be good as would upgrading the valve train if you want to spin to 6,800 rpm.
#7
ive herd of people spinning bearings shortly after installing new rod bolts. im no expert but the bearings have a wear pattern, after 103k miles you are going to loosen them just to install new bolts, they are not going to seat exactly the same way. change the bearings at the same time.
go with the katech rod bolts because they are closer in weight to the stockers. ARP's are heavier and that will throw off the balance a bit.
go with the katech rod bolts because they are closer in weight to the stockers. ARP's are heavier and that will throw off the balance a bit.
Last edited by JohnHF; 12-27-2008 at 04:06 PM.
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#9
ive herd of people spinning bearings shortly after installing new rod bolts. im no expert but the bearings have a wear pattern, after 103k miles you are going to loosen them just to install new bolts, they are not going to seat exactly the same way. change the bearings at the same time.
go with the katech rod bolts because they are closer in weight to the stockers. ARP's are heavier and that will throw off the balance a bit.
go with the katech rod bolts because they are closer in weight to the stockers. ARP's are heavier and that will throw off the balance a bit.
#10
your right, arps rod bolts suck thats why i spin my stock shortblock to 7000 every single pass and still make great power and oil pressure. Ive actually hit my revlimiter which is set at 7100.
need a bigger tire because im out of the powerband but that is irrelevant to the thread.
need a bigger tire because im out of the powerband but that is irrelevant to the thread.
#13
You swap the bolts one at a time and nothing moves at all. The cracked rod cap design makes it virtually impossible for the cap to shift. The Katechs claim the big end of the rod does not need resizing after installed and yes they are identical in weight to a stock one. FWIW I put a set of Katechs in my motor and have spun it to 7200 rpm's without issue.
#15
your right, arps rod bolts suck thats why i spin my stock shortblock to 7000 every single pass and still make great power and oil pressure. Ive actually hit my revlimiter which is set at 7100.
need a bigger tire because im out of the powerband but that is irrelevant to the thread.
need a bigger tire because im out of the powerband but that is irrelevant to the thread.
You swap the bolts one at a time and nothing moves at all. The cracked rod cap design makes it virtually impossible for the cap to shift. The Katechs claim the big end of the rod does not need resizing after installed and yes they are identical in weight to a stock one. FWIW I put a set of Katechs in my motor and have spun it to 7200 rpm's without issue.
Last edited by JohnHF; 12-28-2008 at 01:16 AM.
#18
your right, arps rod bolts suck thats why i spin my stock shortblock to 7000 every single pass and still make great power and oil pressure. Ive actually hit my revlimiter which is set at 7100.
need a bigger tire because im out of the powerband but that is irrelevant to the thread.
need a bigger tire because im out of the powerband but that is irrelevant to the thread.
#20
Where in central MA are you? I live in worcester, was wondering if some time when the weather is nice again (april) you'd mind letting me hear your car idle and maybe take me for a ride in it so I can see how that cam feels?