6800rpm on stock bottom end?
09-04-2007, 06:39 PM
#1
6800rpm on stock bottom end? Is it risky if the guy im looking to buy the car from has been spinning his bottom end to 6800 rpm. the car has upgraded springs and titanium retainers and chromoly pushrods which is all good im just worries about the bottom end. this is the list of modifications: pacesetter lt headers Y pipe catback Torquer V2 cam on a 112lsa, comp prc double spring kit, chromoly hardened pushrods, ported ls6 oil pump, rollmaster double roller timing chain, yank ss4000 stall, b&m tranny cooler. The car is a 1998 Formula with 91k miles
09-04-2007, 06:49 PM
#3
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98's are one of the years with the "weaker" rod bolts. You should spin it past 6200 very often if you want to be safe. So YES, it is bad that the guy is reving up to 6800, very bad...
09-04-2007, 07:34 PM
#4
It could be fine for awhile depending on how much time he's spent above 6200RPM. Hard to say without tearing it down, but I'd be leary of the motor. Not sure what a 'comp prc double spring kit' would be... Associated Spring makes PRC's dual springs, not Comp Cams.
09-05-2007, 09:16 AM
#7
Or you could lift the motor drop the pan and put in arp rod bolts. There is a write up some where on how to do it.
*edit* I think they drop the kmember out of the way so you can get the pan out...not lift the motor.
*edit* I think they drop the kmember out of the way so you can get the pan out...not lift the motor.
Last edited by markp03; 09-05-2007 at 09:23 AM.
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09-05-2007, 11:46 AM
#10
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I shift at 7000 and hit my 7200 rpm rev limiter at the top of 4th gear every time.
Have 65K miles on my 2001 stock bottom end, I did however upgrade to ARP-RodBolts
Have 65K miles on my 2001 stock bottom end, I did however upgrade to ARP-RodBolts
09-05-2007, 01:39 PM
#12
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I think the majority of spun bearings is due to oil starvation. A lot of people have complained about dropping oil pressure at high rpms. I read an SAE paper about ls1's and it said oil tends to accumulate in the top end of the motor leaving the oil pan sucked dry. My car would do it when the oil got older and dirtier. After an oil change it was fine.
If the engine sounds good its probably ok. I wouldnt pay a lot for the car though.
If the engine sounds good its probably ok. I wouldnt pay a lot for the car though.
09-05-2007, 02:00 PM
#13
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I have a 2000 (see sig) and LG advised me that 6800 rpms was about the extent I wanted to push my car. 6700 would be wiser, so for sake of not blowing the motor I try to stay off the rev limiter and shift at 6650-6700 only when racing obviously. I granny shift when not racing. LOL
09-05-2007, 02:13 PM
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actually the limiter is set at 6700, my bad I said 6800
its my car and I asked around and did alot of research, nothing is half assed on the car, believe me I am well aware of the limits of the rod bolts
its my car and I asked around and did alot of research, nothing is half assed on the car, believe me I am well aware of the limits of the rod bolts
09-05-2007, 02:15 PM
#16
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Originally Posted by dug
I think the majority of spun bearings is due to oil starvation. A lot of people have complained about dropping oil pressure at high rpms. I read an SAE paper about ls1's and it said oil tends to accumulate in the top end of the motor leaving the oil pan sucked dry.
I'd be a lil leery about buying someone elses beat on anything. But it's your call.
09-05-2007, 02:24 PM
#17
Originally Posted by 98LS1Formula
actually the limiter is set at 6700, my bad I said 6800
its my car and I asked around and did alot of research, nothing is half assed on the car, believe me I am well aware of the limits of the rod bolts
its my car and I asked around and did alot of research, nothing is half assed on the car, believe me I am well aware of the limits of the rod bolts
09-05-2007, 02:26 PM
#18
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Originally Posted by djsanchez2
Isn't one of the alleviations to this, drilling 1/2 inch holes in the lifter cups?
I'd be a lil leery about buying someone elses beat on anything. But it's your call.
I'd be a lil leery about buying someone elses beat on anything. But it's your call.
09-05-2007, 03:28 PM
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i dd mine that has been spun to 6800rpm by the prevous owner, i put a lot of miles on it too, its a 99. i think its the luck of the draw, some have problems and some dont. i really wouldnt worry about it, but thats just me.
09-05-2007, 03:30 PM
#20
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if your getting a good enough deal on the car just install the rod bolts ?
he did the LS6 oil pump and full valve train it sounds like just take it the other step and you should be okay.
he did the LS6 oil pump and full valve train it sounds like just take it the other step and you should be okay.