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So Shawn at VA speed tore down my turbo motor...

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Old 01-05-2009, 10:09 PM
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Originally Posted by 93formto98T/A
That's very encouraging.dum I'm about to embark on an experiment to test the limits of the ls7 block.dum Shawn is nearly finished with my setup now and we're looking to reach as high as the 1600fwhp level with an ls7 block and 4bolt heads...
I saw your motor on Saturday
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Old 01-07-2009, 01:59 PM
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Wow this year will be sick....lol. Let us know when you need to upgrade chargers again....lol.
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Old 01-08-2009, 09:09 AM
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Should see some pretty good gains with the same amount of boost this year,had some valvetrain issues as well as converter issues
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Old 01-08-2009, 09:20 AM
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Damn Shawn. Havin a lil run on the FI motors ain't ya? Ever do any Kenne Bell stuff? LOL
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Old 01-08-2009, 10:53 AM
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Valvetrain issues??? More like valvetrain disaster
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Old 01-08-2009, 11:46 AM
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nah,valve train disaster is when you pull the head off and see whats left of the connecting rod where the piston used to be
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Old 01-08-2009, 03:33 PM
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Define your valvetrain disaster. Are you planning on just a straight refresh?
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Old 01-08-2009, 04:13 PM
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Originally Posted by Beaflag VonRathburg
Define your valvetrain disaster. Are you planning on just a straight refresh?
severe valve float-nothing broken.refresh with new valvetrain
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Old 01-08-2009, 04:14 PM
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Hydraulic cam + 1400fwhp = bad issues

We're going solid roller
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Old 01-08-2009, 09:12 PM
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Don't tell me that!! I'm working on a hyd roller big turbo deal for a customer!!

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Old 01-08-2009, 09:20 PM
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The only way a hyd deal will work is with the right springs. I know Brian tried some special PSI springs but after 5 passes they were BEAT. Spring pressures were down to 120-130 on the seat. The valvetrain didn't get beat up really that bad considering the parts.
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Old 01-08-2009, 09:22 PM
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Originally Posted by Fireball
Hydraulic cam + 1400fwhp = bad issues

We're going solid roller
What springs were you using?
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Old 01-09-2009, 06:53 AM
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actually you could do it,just requires the right springs as well as the right valvetrain components-lighter is better
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Old 01-09-2009, 08:04 AM
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Originally Posted by veee8
What springs were you using?
PAC 1255 setup with ~195-200 on the seat. After 5 passes, fell to 130 on the seat due to beating them to death

either way, we need to go to 8000 or so rpm this year so
Last edited by Fireball; 01-09-2009 at 08:17 AM.
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Old 01-09-2009, 10:12 AM
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Originally Posted by Fireball
PAC 1255 setup with ~195-200 on the seat. After 5 passes, fell to 130 on the seat due to beating them to death

either way, we need to go to 8000 or so rpm this year so
What were you spinning it to last year?
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Old 01-09-2009, 10:36 AM
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Originally Posted by veee8
What were you spinning it to last year?
7400rpm
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Old 01-09-2009, 10:45 AM
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thats not good news, Im only spinning to 7k but close to matching your hp numbers... lol
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Old 01-09-2009, 11:03 AM
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What kind of valvetrain setup are you running and best mph 1/8 and 1/4?
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Old 01-09-2009, 11:39 AM
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Originally Posted by Tiago
thats not good news, Im only spinning to 7k but close to matching your hp numbers... lol
hp and rpm are only parts of the equation.you got to figure in engine displacement,valve mass,valve size,lifter mass,rocker mass,pushrod mass,spring and retainer mass,lbs boost,cylinder pressure,cam ramp rates,pushrod flex,rocker flex.All of these thing affect valvetrain stability.
While there is no doubt that we could make a hyd valvetrain live in this engine,it would cost as much if not more than going with the solid roller and still be lacking in performance
Last edited by Shawn @ VA Speed; 01-11-2009 at 10:46 AM.
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Old 01-10-2009, 09:15 PM
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Good info here... sorry i couldnt be there...


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