[Z06] LS7 Spintron Testing Request and Donation Thread
08-25-2014, 06:30 PM
#462
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WCCH certainly does it and any machine shot could help you with the set up.
The Jesel shaft set up is a real iterative process wherein the pedestal mounts are milled down <.500" and checked for rocker/valve tip interface then iteratively milled until the set up has proper geometry.
For this reason, each set up would be custom based on overall lift, rocker and pushrod.
Does Jesel offer a performance advantage over stock with stock parts and stock RPM ranges? Excellent question. Would you see these in service more frequently if they did?
Oh... in case anyone has thought to do this, keep in mind that the bolt engagement length is cited to be .750. This could mean drilling through the top of the port to achieve full fastener depth. This is easy to assemble around, but, be aware that grinding the shaft bolts down to flush with the cylinder port top is another charge.
The Jesel shaft set up is a real iterative process wherein the pedestal mounts are milled down <.500" and checked for rocker/valve tip interface then iteratively milled until the set up has proper geometry.
For this reason, each set up would be custom based on overall lift, rocker and pushrod.
Does Jesel offer a performance advantage over stock with stock parts and stock RPM ranges? Excellent question. Would you see these in service more frequently if they did?
Oh... in case anyone has thought to do this, keep in mind that the bolt engagement length is cited to be .750. This could mean drilling through the top of the port to achieve full fastener depth. This is easy to assemble around, but, be aware that grinding the shaft bolts down to flush with the cylinder port top is another charge.
Last edited by davenp; 08-25-2014 at 06:32 PM.
08-25-2014, 10:40 PM
#464
WCCH certainly does it and any machine shot could help you with the set up.
The Jesel shaft set up is a real iterative process wherein the pedestal mounts are milled down <.500" and checked for rocker/valve tip interface then iteratively milled until the set up has proper geometry.
For this reason, each set up would be custom based on overall lift, rocker and pushrod.
Does Jesel offer a performance advantage over stock with stock parts and stock RPM ranges? Excellent question. Would you see these in service more frequently if they did?
Oh... in case anyone has thought to do this, keep in mind that the bolt engagement length is cited to be .750. This could mean drilling through the top of the port to achieve full fastener depth. This is easy to assemble around, but, be aware that grinding the shaft bolts down to flush with the cylinder port top is another charge.
The Jesel shaft set up is a real iterative process wherein the pedestal mounts are milled down <.500" and checked for rocker/valve tip interface then iteratively milled until the set up has proper geometry.
For this reason, each set up would be custom based on overall lift, rocker and pushrod.
Does Jesel offer a performance advantage over stock with stock parts and stock RPM ranges? Excellent question. Would you see these in service more frequently if they did?
Oh... in case anyone has thought to do this, keep in mind that the bolt engagement length is cited to be .750. This could mean drilling through the top of the port to achieve full fastener depth. This is easy to assemble around, but, be aware that grinding the shaft bolts down to flush with the cylinder port top is another charge.
I wonder what the benefits would be for something like this in a 7500rpm LS7, if any at all.
08-25-2014, 10:43 PM
#465
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We do!!!
American Heritage Performance
http://www.americanheritageperformance.com/
We have reworked LS7 heads for lots of Corvette Forum members. All happy customers.
Our number one selling package is our package 4 reworked LS7 heads (Ferrea F2042P exhaust valves, treated stock ti intake valves, our hardened PM guides, Performance Valve job). All for just $1,228 (plus shipping).
We have core sets of LS7 heads available and ready to ship (in case you don't want any down time).
We stand behind our work 100% and pride ourselves on exceptional customer service. Oh and if you a DIY guy we even offer support (you can call us day or night with re-assembly questions).
PM, Email or give us a call 310-326-2399
American Heritage Performance
http://www.americanheritageperformance.com/
We have reworked LS7 heads for lots of Corvette Forum members. All happy customers.
Our number one selling package is our package 4 reworked LS7 heads (Ferrea F2042P exhaust valves, treated stock ti intake valves, our hardened PM guides, Performance Valve job). All for just $1,228 (plus shipping).
We have core sets of LS7 heads available and ready to ship (in case you don't want any down time).
We stand behind our work 100% and pride ourselves on exceptional customer service. Oh and if you a DIY guy we even offer support (you can call us day or night with re-assembly questions).
PM, Email or give us a call 310-326-2399
08-25-2014, 10:46 PM
#466
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We have extensive experience machining LS7 heads for shaft mount rockers. PM us for cost.
08-25-2014, 10:53 PM
#467
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This test has been done already and has been linked in this thread.
08-25-2014, 11:22 PM
#468
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Shaft mount rockers are the way to go (Crower, T&D machining, Jessel). Make sure the shop doing the machining knows what they are doing. If they have not done it before, walk away.
We have extensive experience machining LS7 heads for shaft mount rockers. PM us for cost.
We have extensive experience machining LS7 heads for shaft mount rockers. PM us for cost.
What would you recommend based on what he was suggesting (stock everything except the rockers)? What benefit would the shaft mount rockers provide over the stock rockers?
Thanks for the responses!
08-26-2014, 12:38 AM
#469
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I was under the impression 383 had some aftermarket mods (I did not read thoroughly just glanced quickly).
Adjustability and improved geometry does come to mind as some advantages of RR's. Stock rockers are great for stock applications (and even fine for mod'd applications for those individuals who select that path). For those that want/need adjustability then they will need to go with an aftermarket roller rocker such as T&D, Crower or Jesel.
Adjustability and improved geometry does come to mind as some advantages of RR's. Stock rockers are great for stock applications (and even fine for mod'd applications for those individuals who select that path). For those that want/need adjustability then they will need to go with an aftermarket roller rocker such as T&D, Crower or Jesel.
Last edited by American Heritage; 08-26-2014 at 12:44 AM. Reason: wording
08-26-2014, 02:27 PM
#470
I was under the impression 383 had some aftermarket mods (I did not read thoroughly just glanced quickly).
Adjustability and improved geometry does come to mind as some advantages of RR's. Stock rockers are great for stock applications (and even fine for mod'd applications for those individuals who select that path). For those that want/need adjustability then they will need to go with an aftermarket roller rocker such as T&D, Crower or Jesel.
Adjustability and improved geometry does come to mind as some advantages of RR's. Stock rockers are great for stock applications (and even fine for mod'd applications for those individuals who select that path). For those that want/need adjustability then they will need to go with an aftermarket roller rocker such as T&D, Crower or Jesel.
I don't plan on leaving it stock though, I was just saying for the tests being done in this thread it wouldn't be worth it. It probably wouldn't be worth it for most Z06 owners but I plan on modding AND using the car for track and auto-x. If there is a benefit to shaft mount I would like to know at what point should I consider them?
Correct me if I'm wrong but isn't the LS7's rpm limited by its rod to stroke ratio? If so then the only plus to shaft mount would be for longevity through better geometry, not for an increase in rpm. The heads would last forever but with extreme use other things would wear out first like cylinder bores, rings, bearings...witch would negate the heads being so stout. Correct?
Am I right in my thought here or am I missing something?
08-27-2014, 01:59 PM
#471
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Thread Starter
Ok. Some updates, I have sent Jason a $1,000 deposit to start with. I have also sent him a list of the tests to be performed to his email. He has instructed me to have anyone who has parts they need to send him to perform some of the tests, to go ahead and send them in to this address:
24324 Sorrentino Court
Clinton Twp., MI 48035
Att: Jason Harding
24324 Sorrentino Court
Clinton Twp., MI 48035
Att: Jason Harding
Last edited by forg0tmypen; 08-27-2014 at 02:10 PM.
08-28-2014, 10:39 PM
#474
Melting Slicks
So, do you want me to send a couple Harlin Sharp bolt-on full roller rockers? To use these you will need a 7.500" push rod (assuming a stock lifter) which I also have and could send.
I am in Canada and it is a PITA dealing with the border so I really don't want to bother sending any of this stuff unless you are actually going to do a test that involves using it.
Cheers, Paul.
I am in Canada and it is a PITA dealing with the border so I really don't want to bother sending any of this stuff unless you are actually going to do a test that involves using it.
Cheers, Paul.
08-28-2014, 11:09 PM
#475
Safety Car
Thread Starter
So, do you want me to send a couple Harlin Sharp bolt-on full roller rockers? To use these you will need a 7.500" push rod (assuming a stock lifter) which I also have and could send.
I am in Canada and it is a PITA dealing with the border so I really don't want to bother sending any of this stuff unless you are actually going to do a test that involves using it.
Cheers, Paul.
I am in Canada and it is a PITA dealing with the border so I really don't want to bother sending any of this stuff unless you are actually going to do a test that involves using it.
Cheers, Paul.
09-01-2014, 09:32 PM
#476
09-03-2014, 10:35 PM
#477
Melting Slicks
I spoke with him first and he indicated that I didn't need to send shorter PRs too since they would want to set their own lifter preload for the test and had lots of different length PRs with which to do so.
Cheers, Paul.
09-07-2014, 11:33 PM
#478
Melting Slicks
My contribution, was just sent out today...by some time next week Jason will have a pair of HS bolt-on full roller rockers that have an over-the-tip weight of about 20 grams (nearly double that of the stock rocker).
I spoke with him first and he indicated that I didn't need to send shorter PRs too since they would want to set their own lifter preload for the test and had lots of different length PRs with which to do so.
Cheers, Paul.
I spoke with him first and he indicated that I didn't need to send shorter PRs too since they would want to set their own lifter preload for the test and had lots of different length PRs with which to do so.
Cheers, Paul.
Thank you.
