Are 6.0's prone to lifting heads?
10-09-2012, 08:10 PM
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Are 6.0's prone to lifting heads? Sorry this being my first post but I have searched long and hard to find a answer to this question.
I want to build this engine focusing on using e85 so we can boost up to 25lbs and my friend says its a waste of money because 17lbs of boost is about all we are going generate without lifting the heads and getting coolant in the oil? He says the 6.0's are prone to lifting the heads. I guess I would like to hear from you guys and see if there is any truth to this?
My friend and I are going to build a turbo 6.0. We have a 2001 LQ4 and it is going to get forged pistons and rods, and reuse the crank. We know we are going to stud the head to make sure we have as much clamping force as we can get on the heads. This is going to be a street car so its going to either be pump gas or e85. I would like to produce 800-1000 hp with a single turbo, but we are a few months away from making our final decision on the details.
I want to build this engine focusing on using e85 so we can boost up to 25lbs and my friend says its a waste of money because 17lbs of boost is about all we are going generate without lifting the heads and getting coolant in the oil? He says the 6.0's are prone to lifting the heads. I guess I would like to hear from you guys and see if there is any truth to this?
My friend and I are going to build a turbo 6.0. We have a 2001 LQ4 and it is going to get forged pistons and rods, and reuse the crank. We know we are going to stud the head to make sure we have as much clamping force as we can get on the heads. This is going to be a street car so its going to either be pump gas or e85. I would like to produce 800-1000 hp with a single turbo, but we are a few months away from making our final decision on the details.
10-09-2012, 08:45 PM
#2
Sorry this being my first post but I have searched long and hard to find a answer to this question.
I want to build this engine focusing on using e85 so we can boost up to 25lbs and my friend says its a waste of money because 17lbs of boost is about all we are going generate without lifting the heads and getting coolant in the oil? He says the 6.0's are prone to lifting the heads. I guess I would like to hear from you guys and see if there is any truth to this?
My friend and I are going to build a turbo 6.0. We have a 2001 LQ4 and it is going to get forged pistons and rods, and reuse the crank. We know we are going to stud the head to make sure we have as much clamping force as we can get on the heads. This is going to be a street car so its going to either be pump gas or e85. I would like to produce 800-1000 hp with a single turbo, but we are a few months away from making our final decision on the details.
I want to build this engine focusing on using e85 so we can boost up to 25lbs and my friend says its a waste of money because 17lbs of boost is about all we are going generate without lifting the heads and getting coolant in the oil? He says the 6.0's are prone to lifting the heads. I guess I would like to hear from you guys and see if there is any truth to this?
My friend and I are going to build a turbo 6.0. We have a 2001 LQ4 and it is going to get forged pistons and rods, and reuse the crank. We know we are going to stud the head to make sure we have as much clamping force as we can get on the heads. This is going to be a street car so its going to either be pump gas or e85. I would like to produce 800-1000 hp with a single turbo, but we are a few months away from making our final decision on the details.
I have arp studs aluminum eldorbrock racing heads with cosmetic mls. My heads just starting leaking when i get over 24psi. 9.5.1 compression. 93oct and meth. Duel nozzle 15gpm.
10-09-2012, 09:32 PM
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I would agree with both of you guys. He is telling me that reguardless of fuel, the design of the head wont hold the pressure of sustained boost beyond 20lbs. I see a lot of people on here who really only go to 15-18lbs. I want to run e85 and run at 25lbs. He doesn't think we can do it w/o lifting the heads.
Its a cost analysis of setting the fuel system up for e85 (pump, lines, injectors) just to get a few more lbs of boost which he says we cant use cause the heads will lift off vs just building a pump gas car that will run at 17lbs. I think we can meet our power goals either way, but think that e85 will get us there with more power to spare.
You guys are saying what I have been telling him. When a few more ppl chime in Im going to show him this post as a testament of someone feeding him misinformation.
Its a cost analysis of setting the fuel system up for e85 (pump, lines, injectors) just to get a few more lbs of boost which he says we cant use cause the heads will lift off vs just building a pump gas car that will run at 17lbs. I think we can meet our power goals either way, but think that e85 will get us there with more power to spare.
You guys are saying what I have been telling him. When a few more ppl chime in Im going to show him this post as a testament of someone feeding him misinformation.
10-10-2012, 07:57 AM
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Your friend has (like many of us) read of the horror stories of guys who push water after 18+ psi. i'm no expert by any means, but there are remedies to it such as o-ringing the block, not getting too aggressive with timing and high boost, and actually torquing the heads down to required ft/lb. the 4 bolt head set-up typically is limited to 16-18 psi varying by setup. but there are a lot of guys running 20-22 psi and never had a leak issue. There are also people who have leaked from the heads at 14psi...
10-10-2012, 08:36 AM
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Why get caught up on such high psi??? Build a better motor turbo combo and make your power goal with only the pressure needed. If you can make 1k rwhp with only 12-18 wouldn't you??? Sounds silly to say you want 25psi ???
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10-10-2012, 12:39 PM
#11
https://www.youtube.com/watch?v=D1an...w&feature=plcp
Here is one of our 6.0 402's at 885rwhp. Still together and beating on it daily. No problem with running 20+ lbs with a good thick deck head and ARP head studs.
Here is one of our 6.0 402's at 885rwhp. Still together and beating on it daily. No problem with running 20+ lbs with a good thick deck head and ARP head studs.
10-10-2012, 02:21 PM
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To set the record straight, I'm used to turbo Buicks (pump gas 18lbs, e85 25-28 lbs). That's why I'm fascinated with getting higher boost out of the 6.0. The sad thing is I think my buddy is right with concerns of not getting more benefits from e85 as opposed to pump gas. Only benefit I see now with e85 would being able to run a higher static cr. There is only so much pressure that 4 bolts per cylinder can hold back.
I completely agree that for our power needs that 18lbs and pump gas is probably more than adequate. Making power with a turbo 6.0 isn't the problem, I know it makes big power which is why we are going that route vs a Turbo 3.8. Dollar spent vs hp gain isn't even on the same level. We just wanted to make sure that we build our engine with the right goals in mind. It looks like 24+ really isn't needed for our goals anyways.
I completely agree that for our power needs that 18lbs and pump gas is probably more than adequate. Making power with a turbo 6.0 isn't the problem, I know it makes big power which is why we are going that route vs a Turbo 3.8. Dollar spent vs hp gain isn't even on the same level. We just wanted to make sure that we build our engine with the right goals in mind. It looks like 24+ really isn't needed for our goals anyways.
10-10-2012, 07:52 PM
#14
10-10-2012, 10:30 PM
#15
To set the record straight, I'm used to turbo Buicks (pump gas 18lbs, e85 25-28 lbs). That's why I'm fascinated with getting higher boost out of the 6.0. The sad thing is I think my buddy is right with concerns of not getting more benefits from e85 as opposed to pump gas. Only benefit I see now with e85 would being able to run a higher static cr. There is only so much pressure that 4 bolts per cylinder can hold back.
I completely agree that for our power needs that 18lbs and pump gas is probably more than adequate. Making power with a turbo 6.0 isn't the problem, I know it makes big power which is why we are going that route vs a Turbo 3.8. Dollar spent vs hp gain isn't even on the same level. We just wanted to make sure that we build our engine with the right goals in mind. It looks like 24+ really isn't needed for our goals anyways.
I completely agree that for our power needs that 18lbs and pump gas is probably more than adequate. Making power with a turbo 6.0 isn't the problem, I know it makes big power which is why we are going that route vs a Turbo 3.8. Dollar spent vs hp gain isn't even on the same level. We just wanted to make sure that we build our engine with the right goals in mind. It looks like 24+ really isn't needed for our goals anyways.
10-11-2012, 02:47 PM
#17
This is my car a few weeks ago. E85, 317 truck heads, 6.0 block, 378 cid, twin 61mm turbos at 14 psi.
http://youtu.be/P5PrDH5x9fw
http://youtu.be/P5PrDH5x9fw
