High RPM LT1?
02-19-2010, 10:11 AM
#41
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I'm running a HV pump and everything looks good....it really depends on the clearances that are used in the motor (rods, mains, ptw). In my case mines built a bit on the loose side so I see no more than 70 psi at 8000rpm. IMO theres no need for these 90-100psi numbers....look at some of the circle track race motors that run no more than 40 psi at 9000. A ton of oil pressure is not needed and just simply robs power.
02-19-2010, 10:18 AM
#42
this is true.....in my case i needed a hv pump to deliver the volume i needed for my clearances but if you think about it the higher the pressure the more it takes to spin that pump....also with the proper oil control techniques you can do ok with a hv pump as for the drain back
02-19-2010, 01:16 PM
#43
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ok just to update everyone. I am going to run relatively tight clearances so I won't need a high volume pump. I am most likely going to run a 383 cause I don't have a huge budget for extremely high rpms. I won't be doing any serious racing so even if a 355 with more RPMs is best I don't think 383 with a shorter power band will be much of a sacrafice if it allows me to keep the RPMs down and keep my PCM.
This is what the car will be used for on occasions Z06 HPDE it will also be used in some AutoX events and maybe an occasional 1/4 mile run.
so far this is what I have planned
-A Callies 3.75" crank (compstar or magnum)
-Compstar 6" H beams
-JE forged aluminum pistons
-custom ground solid roller cam
-aluminum flywheel
-Canton 242T 6qt. pan
so far this is what I have
-AFR 190's ported to 212cc
-50+ hours of hand porting by MORE Performance
-62cc chambers
-Manley 2.06" intake valves
-Manley 1.60" exhaust valves
-Comp Cams 987 valvesprings
-Comp Cams Titanium retainers
-Comp Cams 10 degree locks
-Comp Cams 4808 guideplates
-7/16" studs
-LT1 intake portmatched to heads and 58mm TB opening
This is what the car will be used for on occasions Z06 HPDE it will also be used in some AutoX events and maybe an occasional 1/4 mile run.
so far this is what I have planned
-A Callies 3.75" crank (compstar or magnum)
-Compstar 6" H beams
-JE forged aluminum pistons
-custom ground solid roller cam
-aluminum flywheel
-Canton 242T 6qt. pan
so far this is what I have
-AFR 190's ported to 212cc
-50+ hours of hand porting by MORE Performance
-62cc chambers
-Manley 2.06" intake valves
-Manley 1.60" exhaust valves
-Comp Cams 987 valvesprings
-Comp Cams Titanium retainers
-Comp Cams 10 degree locks
-Comp Cams 4808 guideplates
-7/16" studs
-LT1 intake portmatched to heads and 58mm TB opening
02-19-2010, 01:23 PM
#44
50+hours of porting work????? At a ridiculously low shop rate of $50 an hour that would be $2500 in porting without parts. Real labor rate is going to be higher than $50. I REALLY doubt there is that much time into them and it is not that huge an undertaking to remove 22ccs of material from a port. The shops porting stock castings routinely take 20-40ccs out and they are not putting 50hours into a pair of stock castings.
Your springs are for a mild hydraulic cam.
On the HV vs. HP pump. A HV pump just goes into bypass sooner and does NOT move any more oil through the bearings, just recirculates it through the bypass at a lower rpm. A HP pump allows the bearings to see increased oil flow to a higher rpm before it too will go into bypass.
Your springs are for a mild hydraulic cam.
On the HV vs. HP pump. A HV pump just goes into bypass sooner and does NOT move any more oil through the bearings, just recirculates it through the bypass at a lower rpm. A HP pump allows the bearings to see increased oil flow to a higher rpm before it too will go into bypass.
02-19-2010, 01:33 PM
#45
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50+hours of porting work????? At a ridiculously low shop rate of $50 an hour that would be $2500 in porting without parts. Real labor rate is going to be higher than $50. I REALLY doubt there is that much time into them and it is not that huge an undertaking to remove 22ccs of material from a port. The shops porting stock castings routinely take 20-40ccs out and they are not putting 50hours into a pair of stock castings.
Your springs are for a mild hydraulic cam.
On the HV vs. HP pump. A HV pump just goes into bypass sooner and does NOT move any more oil through the bearings, just recirculates it through the bypass at a lower rpm. A HP pump allows the bearings to see increased oil flow to a higher rpm before it too will go into bypass.
Your springs are for a mild hydraulic cam.
On the HV vs. HP pump. A HV pump just goes into bypass sooner and does NOT move any more oil through the bearings, just recirculates it through the bypass at a lower rpm. A HP pump allows the bearings to see increased oil flow to a higher rpm before it too will go into bypass.
02-19-2010, 03:21 PM
#47
50+hours of porting work????? At a ridiculously low shop rate of $50 an hour that would be $2500 in porting without parts. Real labor rate is going to be higher than $50. I REALLY doubt there is that much time into them and it is not that huge an undertaking to remove 22ccs of material from a port. The shops porting stock castings routinely take 20-40ccs out and they are not putting 50hours into a pair of stock castings.
02-19-2010, 08:50 PM
#53
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02-19-2010, 09:20 PM
#54
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You don't want to run stud girdles. More than one person has testified what a pain in the *** they are to install and hold valve adjustment when they are being torqued down. If you want to turn 8000rpm you need shaft mounts. The last thing you want to do is skimp on your valvetrain if you plan on following through with this.
02-19-2010, 09:42 PM
#55
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You don't want to run stud girdles. More than one person has testified what a pain in the *** they are to install and hold valve adjustment when they are being torqued down. If you want to turn 8000rpm you need shaft mounts. The last thing you want to do is skimp on your valvetrain if you plan on following through with this.
02-19-2010, 10:21 PM
#56
You don't want to run stud girdles. More than one person has testified what a pain in the *** they are to install and hold valve adjustment when they are being torqued down. If you want to turn 8000rpm you need shaft mounts. The last thing you want to do is skimp on your valvetrain if you plan on following through with this.
Why skimp on a build that ambitious?
02-20-2010, 12:23 AM
#58
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I don't think it's necessary to run shaft mounts at 7000rpm, however it's only my opinion. I turn 7200 and am running stud mounts. Quite possible you would have to adjust the valvetrain more often than with shaft mounts, but I don't mind. I am a bit vigilant about adjusting valves because I like to know the condition of valvetrain parts.
02-20-2010, 03:28 AM
#59
I don't think it's worth running a solid roller over a hydraulic if you are going to keep it around 7Krpm. Solid roller is alot harder on valvetrain and while it does have it's advantages in making power I don't think with a cam small enough to keep RPM's down around 7K will justify the extra expense in the solid roller setup. There are alot of nice hydraulic lifters available and plenty of people LTx or LSx running big cam's on hydraulic setups.
I personally would probably ditch them heads for some TEA or AI's or similar CNC'd heads too. Proven setups from AI have produced mid 400's rwhp nearly everytime!
I personally would probably ditch them heads for some TEA or AI's or similar CNC'd heads too. Proven setups from AI have produced mid 400's rwhp nearly everytime!