C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

what's holding me back?

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Old May 21, 2014 | 07:26 AM
  #61  
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What cam specs do you have?
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Old May 21, 2014 | 07:32 AM
  #62  
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Originally Posted by 383vett
I think the dyno thing has been discussed a few times. Have you done a leakdown and compression test?
I have done a compression test before I started the motor after installing the heads. I did that to check for a head gasket leak, because the first time around the gaskets leaked.

I'm going to pull the timing chain cover off today and see if maybe the timing marks are off and also I'll do a compression and leak down test.
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Old May 21, 2014 | 07:33 AM
  #63  
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Originally Posted by LD85
What cam specs do you have?
224/224 duration @ 0.050", 0.528" lift with 1.6 Roller rockers, 112 LSA

It is a flat tappet cam
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Old May 21, 2014 | 09:00 AM
  #64  
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Why bother with all the extra work? If the car runs and you can drive it, go to the dyno guys and get a baseline to see what the motor is putting out. Then you can start backtracking to see if something is not right.

Right now you are just wasting your time and energy. Especially if you have no idea of the HP and torque the engine is putting out.
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Old May 21, 2014 | 09:20 AM
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Originally Posted by c4cruiser
Why bother with all the extra work? If the car runs and you can drive it, go to the dyno guys and get a baseline to see what the motor is putting out. Then you can start backtracking to see if something is not right.

Right now you are just wasting your time and energy. Especially if you have no idea of the HP and torque the engine is putting out.
Because when I go to the dyno I am going to tune it to the correct AFR, if something mechanically is off, I want to make sure I correct it so I don't have to pay twice for the dyno.
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Old May 21, 2014 | 10:52 AM
  #66  
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Daniel I will try to be as clear as I can. If I were you I would be doing this.

1. stop using butt dyno and getting your engine "repaired" over the phone call
2. do nothing until you get to dyno.
3. while in there, tune for most hp and torq you can. Dont aim for "magical" 12.8 afr, tune for what ever gives you most power.
4. post your results here, not the numbers but the picture of dyno sheet.

Until that, this all is useless
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Old May 21, 2014 | 11:13 AM
  #67  
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.....and to make this 3 for 3....
Originally Posted by DanielRicany
I'm going to pull the timing chain cover off today and see if maybe the timing marks are off and also I'll do a compression and leak down test.
Originally Posted by c4cruiser
Why bother with all the extra work? If the car runs and you can drive it, go to the dyno guys and get a baseline to see what the motor is putting out. Then you can start backtracking to see if something is not right.

Right now you are just wasting your time and energy. Especially if you have no idea of the HP and torque the engine is putting out.
Please listen to this^ man.

Ya don't even know if you have a problem or not! Yet you're going to tear into the motor again? Ya have a dyno day scheduled...right?
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Old May 21, 2014 | 12:05 PM
  #68  
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Originally Posted by Tom400CFI
.....and to make this 3 for 3....



Please listen to this^ man.

Ya don't even know if you have a problem or not! Yet you're going to tear into the motor again? Ya have a dyno day scheduled...right?
Not yet, I'm going to set up an appointment probably tomorrow.

I took the timing chain cover off and the marks were perfect.

Now I'm going to do a compression and leak down test. At least I'll have everything ruled out.
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Old May 21, 2014 | 01:06 PM
  #69  
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HOLY CRAP! I think I found something! I was looking at my harmonic balancer when it was off, and I was thinking to myself, what if it spun? I went over to look at my D.U.I. distributor with a clear cap, and looked around for the rotor. I'm thinking this should be about 10* before the number 1 cylinder post on the cap. Well It wasn't. It was all the way on the other side of the cap! 180* out! How the hell is this engine running 180* out???

I have an MSD ignition box with multiple spark, would that multiple spark keep it running?

The timing marks are lined up still on the timing gears, crank at 12 o'clock, cam at 6 o'clock.

Any ideas???
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Old May 21, 2014 | 01:15 PM
  #70  
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You can install it 180 out. How the hell is it running? you better double ck that. Is the engine at TDC?

Last edited by ch@0s; May 21, 2014 at 01:17 PM.
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Old May 21, 2014 | 01:15 PM
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Yes, I have some ideas, but for the most part, I'll bite my tongue.

One thing I'll share however, is that the car WON'T run w/the distributor 180* out, so you're either misunderstanding something, or many things. It's not 180 out (since it runs/drives, as you claim).

Why don't your confirm #1 TDC?
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Old May 21, 2014 | 01:20 PM
  #72  
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I'll post a video. Give me a few minutes.
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Old May 21, 2014 | 01:26 PM
  #73  
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With dot-to-dot cam/crank gear orientation...#6 is in firing position.
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Old May 21, 2014 | 01:55 PM
  #74  
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Here's the video. If you watch it in 720p HD its easier to see.

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Old May 21, 2014 | 02:05 PM
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So whos going to say it first? I already said leave it alone.

edit: oh tequilaboy said it already
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Old May 21, 2014 | 02:36 PM
  #76  
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Another thing to check is the lift on each cam lobe. It is.not too hard to flatten a lobe or twoif the cam wasn't broken in correctly.
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Old May 21, 2014 | 02:39 PM
  #77  
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Daniel here a pic from my rotor/cap/ignition module tune up,it seems to me your cap is in a different position,specially looking at BATT TACH connector
[IMG][/IMG]

this is the correct orientation of the cap in relation to a fine positioned distributor assy

look at the distributor base,the ECM/ignition module connector is pointed to the rear agaist the windshield,while your cable is coming out from distributor base in a different position see video 1:12,it comes out lined with distributor clamp ...
[IMG][/IMG]
[IMG][/IMG]
[IMG][/IMG]

Last edited by tunedport85inject; May 21, 2014 at 02:51 PM.
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Old May 21, 2014 | 02:55 PM
  #78  
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Originally Posted by DanielRicany
HOLY CRAP! I think I found something! I was looking at my harmonic balancer when it was off, and I was thinking to myself, what if it spun? I went over to look at my D.U.I. distributor with a clear cap, and looked around for the rotor. I'm thinking this should be about 10* before the number 1 cylinder post on the cap. Well It wasn't. It was all the way on the other side of the cap! 180* out! How the hell is this engine running 180* out???

I have an MSD ignition box with multiple spark, would that multiple spark keep it running?

The timing marks are lined up still on the timing gears, crank at 12 o'clock, cam at 6 o'clock.

Any ideas???
With your level of knowledge, how did you assemble this engine?

You are way over your head here... take the car to the shop and let the professionals fix it.
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Old May 21, 2014 | 03:04 PM
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Originally Posted by bogus
With your level of knowledge, how did you assemble this engine?

You are way over your head here... take the car to the shop and let the professionals fix it.
Been there, done that, they couldn't fix it. I have a lot of knowledge about cars. The only reason why I ask it to confirm. You guys make me think I'm crazy, and in the end the things that I was talking about are persistent problems.

It doesn't benefit me if someone else does my work for me. That's what I do for a living, fix cars.
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Old May 21, 2014 | 03:08 PM
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Originally Posted by DanielRicany
Been there, done that, they couldn't fix it. I have a lot of knowledge about cars. The only reason why I ask it to confirm. You guys make me think I'm crazy, and in the end the things that I was talking about are persistent problems.

It doesn't benefit me if someone else does my work for me. That's what I do for a living, fix cars.
Maybe its just not broken bud. we keep trying to tell you that.
What did the shop that built it say was wrong/not wrong?
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