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

Low dyno numbers

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Old Jul 16, 2013 | 08:47 PM
  #31  
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Re: Low dyno numbers

I stopped down after work and asked them about degreeing the cam.. They didnt think that was the issue and were leaning towards the "chirp" in the motor.. I saw the thread where 15hp was gained w/ the cutouts.. I would hollow out the cats in a heartbeat.. Looking forward to hearing what they find when they drop the pan.. After inspecting the oil filter didnt seem too bad?? I understand any metal in the oil is bad.. Seems like some is to be expected after all the new parts.. fingers crossed.. I want the car back bad.. To warm to be driving a winter beater..

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Old Jul 17, 2013 | 05:52 PM
  #32  
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Re: Low dyno numbers

Valves ok? Im thinking you may have them to loose or tight.
Old Jul 17, 2013 | 06:35 PM
  #33  
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Re: Low dyno numbers

I did the valves originally with motor running 1/8 turn past where they were clicking.. When I dropped car off at tuner I asked them to adjust, they did them using a dial indicator..
Old Jul 20, 2013 | 04:01 PM
  #34  
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Re: Low dyno numbers

bottom end is toast.. Strocker time...
Old Jul 20, 2013 | 04:58 PM
  #35  
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Re: Low dyno numbers

What do you mean toast? Details.
Old Jul 20, 2013 | 05:04 PM
  #36  
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Re: Low dyno numbers

they pulled pan and 3 rods all shot.. pulled 1 main cap bearing spun.. said it looked like it has been going on for a while.. The low oil sensor had layers of metal on it..
Old Jul 21, 2013 | 09:09 AM
  #37  
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Re: Low dyno numbers

Sorry to hear the bad news..
Old Jul 23, 2013 | 03:03 PM
  #38  
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Re: Low dyno numbers

After seeing your pics, spun bearing was my thought too. Had the same problem on my ride on the dyno. Low power, metal in oil. Sorry to hear it.

Mav
Old Jul 23, 2013 | 08:52 PM
  #39  
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Re: Low dyno numbers

thanks guys..
Old Jul 24, 2013 | 12:04 AM
  #40  
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Re: Low dyno numbers

Originally Posted by Shangrila
Have you tried switching your rocker arms around to a 1.5 ratios? Then 1.5 on the intake 1.6 on the exhaust and vise versa?
Joe is right, don't do this. The camshaft was designed for a certain rocker ratio, this isn't 1974.

Originally Posted by Shangrila
Well they claim it's 205cc intake and ??cc on the exhaust, maybe it's just a 180cc head that can't flow the numbers you were looking to get. Aside timing being off I really can't see what else would cost you that much HP unless your parking brake is stuck.
Have you ever had first had experience or CC'ed some of Lloyd's heads? I've done a few and you're making quite the accusation to say they are off by 25cc and don't flow the numbers they claim. I could understand if Lloyd was a snake oil salesman who just peddled junk to feeble minded folks, but he's been around a long time, does excellent work, and supports this community year after year. You're clearly a novice and we don't need the blind leading the blind off a cliff here [parking brake and 1.5 rockers].


Originally Posted by SSSean
they pulled pan and 3 rods all shot.. pulled 1 main cap bearing spun.. said it looked like it has been going on for a while.. The low oil sensor had layers of metal on it..
Well that's no fun. Keep the heads, get Lloyd to spec you a bigger cam,and enjoy the new stroker.
Old Jul 24, 2013 | 09:32 AM
  #41  
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Re: Low dyno numbers

Banking on the heads are not effected.. Also hoping the cams ok.. Gonna tear the bottom end down and see whats left and go from there..
Old Jul 24, 2013 | 01:33 PM
  #42  
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Re: Low dyno numbers

Originally Posted by SSSean
Banking on the heads are not effected.. Also hoping the cams ok.. Gonna tear the bottom end down and see whats left and go from there..
If you're sticking N/A I'd find a good factory crank, ARP bolt some PM rods, get .030" over pistons and let it eat. Then you won't lose money on selling/buying a cam and tune for a 383, not to mention the new crank, rods, etc.

I doubt the heads or cam got jacked up, have them inspected and re-install. Don't change rocker ratio, don't buy new heads or any of that malarkey.
Old Jul 24, 2013 | 05:13 PM
  #43  
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Re: Low dyno numbers

Thanks for advice.. They cylinders still had quite a bit of criss cross when I had the heads off.. What are you thoughts about doing a ball hone and just re-ringing original pistons?
Old Jul 24, 2013 | 09:19 PM
  #44  
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Re: Low dyno numbers

The last motor I built we checked both the bores and pistons and they were within tolerance so we honed and re-ringed the motor. New Mahle rings are lke $65. If you're able to do that it'll save you even more money. If you're N/A at not at radical power levels I think it'd be a good move, especially on a budget. We had the crank turned and did ARP bolted PM rods. The motor has a XE503 cam with GTP heads and runs like a top in a C4 Corvette.
Old Jul 25, 2013 | 01:19 AM
  #45  
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Re: Low dyno numbers

Originally Posted by Bersaglieri
Joe is right, don't do this. The camshaft was designed for a certain rocker ratio, this isn't 1974.



Have you ever had first had experience or CC'ed some of Lloyd's heads? I've done a few and you're making quite the accusation to say they are off by 25cc and don't flow the numbers they claim. I could understand if Lloyd was a snake oil salesman who just peddled junk to feeble minded folks, but he's been around a long time, does excellent work, and supports this community year after year. You're clearly a novice and we don't need the blind leading the blind off a cliff here [parking brake and 1.5 rockers].




Well that's no fun. Keep the heads, get Lloyd to spec you a bigger cam,and enjoy the new stroker.
What worked in 1974 works today also, and it will work as long as combustion engines exist. When did they start stroking engines, I bet way before 1974 and people are still doing that today? Believe it or not some people stager rockers today in search of power, but I shouldn’t have to point this out to an expert like your self.
The OP claimed he wasn’t making the power he hoped for or at least on the dyno, there was nothing about engine troubles till latter. He indicated nothing other then his mechanic hearing a chirp noise. I’m not here to participate in your sausage-wagging contest, and yes, my parking/break pad was stuck on one side where it wore down to the point that it could have been used as a door wedge.



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