LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

383 dyno graph - strange dip in upper rpms

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Old 06-29-2007, 11:50 PM
  #16  
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D'Agostino had no opinion? I thought they were top notch?
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Old 06-29-2007, 11:58 PM
  #17  
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Originally Posted by Dan Parker '96
D'Agostino had no opinion? I thought they were top notch?


I wonder who their mechanic is now. When they first opened up they had a badass mechanic, but then they decided they wanted to go a cheaper route, and now since I moved up north I have no idea who the mechanic is now.
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Old 06-30-2007, 11:36 PM
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Originally Posted by 97bowtie
If so, was that dip there in the same spot on every pull?
yeah same spot.
if i remember correctly, no timing was being pulled.
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Old 07-01-2007, 07:22 AM
  #19  
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Here is the 3rd chime for valve spring harmonics. It's very common.

Karl Ellwein
Ellwein Engines

Last edited by quickSS; 07-14-2007 at 05:00 PM. Reason: fix typ-oh
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Old 07-01-2007, 02:00 PM
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Originally Posted by quickSS
Here is the 3rd chime for valve spring harmonics. It's very common.

Karl Ellwein
Ellwien Engines

does that mean they just need to be properly adjusted, or are they going bad?
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Old 07-01-2007, 02:32 PM
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Means they are the wrong ones for those cam lobes!

Did the HP take a big dumb past 6200? With 238° intake duration that shouldn't happen.

Bret
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Old 07-02-2007, 12:27 AM
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Originally Posted by SStrokerAce
Means they are the wrong ones for those cam lobes!

Did the HP take a big dumb past 6200? With 238° intake duration that shouldn't happen.

Bret
it looks like it was starting to go down around 6200, and being unsure about the springs i was scared to rev it much higher than that, so i dont know how much of a dump it really takes.

i cant remember for the life of me what springs i bought. i guess i could hunt back through my receipts (if i kept it).

i also thought this came would spin alot higher, so what springs should i get?
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Old 07-03-2007, 12:19 PM
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PAC Beehives. I have no clue about the cam lobes but most Cam Motion stuff is pretty tame.
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