Engine Dyno info from Mercruiser

[zr1nsxgto]

What if any info has anyone received from the museum regarding the dyno sheets for our cars? I know this has been beat to death here, but I have a opportunity to chat with Jim Campbell from Chevrolet today and was curious if there have been any developments regarding the owners getting the dyno info for their cars?

[Kevin]

never going to happen. we've been trying to get them released for years and GM won't let it happen. Best advice is to forget they exist

[carter200]

Forget what exists..........;)

[Fully Vetted]

never going to happen. we've been trying to get them released for years and GM won't let it happen. Best advice is to forget they exist

Ok, I'll bite. So, what's the big secret?

[tomtom72]

Ok, I'll bite. So, what's the big secret?

When our motors were finished with the assembly work they were tested in a test cell at the Merc plant. If they passed muster they were packaged up and shipped to the BG plant to wait to be put in our cars.

The data sheet from each engine was printed out and attached to that specific motor's documentation from the assembly process. There are dyno sheets for each LT5 Merc built and GM stored them at the NCM with the rest of all the corvette documentation that the NCM stores and preserves for GM. The kink in the works is that GM gave specific instructions to the NCM that the LT5 dyno sheets, (and I assume the Q/C reports for each LT5), are not for public consumption like the build and window stickers that they let us vette owners get copies of.

:cheers:
Tom

[Fully Vetted]

Holy crap. I had no idea. Now I wish I didn't know they existed.

[tomtom72]

Yea, it's kind of like the hospital where you're born having your birth certificate and telling you you can't have it after your 18th b-day! LOL

I just wonder if it is an actual graph or is it more a spread sheet of power vs rpm? Either way I'd like to add it to my car's pizza box just for the sake of "having all my car's documents". I'm wondering what other assembly documentation may have been preserved. I know there were great pains taken in the assembly process at different stages to check dimensional accuracy after major parts were done being machined. I'd even like to have that stuff, if it was saved. I know I'm rambling, sorry!:o

It's just if you think about it, we own one of the few American production cars ever assembled that came standard with a hand built motor! I mean that is a bit of a rarity, no? Oh, and I point that out to all my C6 ZO6 buddies just as a matter of distinction between a hand assembled motor vs a hand built motor. :mrgreen:

:cheers:
Tom

[scottfab]

I seem to recall that all this info was given to the NCM.
However, they may have been issued instructions about
how the information could be dealt with?
Anyone else remember anything on this?

[Hammer]

Here's a few previous conversations regarding the information.

http://www.zr1.net/forum/showthread.php?t=12340&highlight=dyno+sheet

http://www.zr1.net/forum/showthread.php?t=7428&highlight=dyno+sheet

[scottfab]

Here's a few previous conversations regarding the information.

http://www.zr1.net/forum/showthread.php?t=12340&highlight=dyno+sheet

http://www.zr1.net/forum/showthread.php?t=7428&highlight=dyno+sheet

Yah, That's the ticket.
You have a mind like a steel trap.
Thanks,

[Blue Flame Restorations]

This is about as close as anyone will ever get to seeing actual Dyno numbers during the "development" of the LT5. This data is from Jan 88. This booklet was prepared for all meeting attendees for the "go ahead" to produce the production model of the LT5. This meeting was held at Lotus, in the UK, between GM and Lotus engineers.

This is the Holy Grail for us.

http://i56.tinypic.com/11rpyeo.jpg
http://i55.tinypic.com/2dt50fq.jpg
http://i52.tinypic.com/23t3tig.jpg

[Blue Flame Restorations]

This is an actual LT5 Engine Build Booklet. This documents the entire build of the engine and is all hand written by the assembly technician. LT5 Engine 046. Look at the engine closely. There are several characteristics that differ from typical production LT5 motors.

http://i46.tinypic.com/1g6vma.jpg
http://i45.tinypic.com/35a7o60.jpg
http://i45.tinypic.com/2eprrih.jpg

[LGAFF]

Brett is this the stuff I scanned or more?

[Blue Flame Restorations]

Brett is this the stuff I scanned or more?


The Engine Build Booklet was not scanned.

[Kevin]

http://i.imgur.com/h0MOM.jpg

[Blue Flame Restorations]

http://i.imgur.com/h0MOM.jpg


Neat piece, Kevin. Do you have a full page pic you can post?

[XfireZ51]

Brett,

Yeah quite a few details that are different from production motor.

[Fully Vetted]

I think we should collectively make another push. Especially considering that the old GM no longer even exists.

[Mystic ZR-1]

Attached is what's in the NCRS archives for LT5 dyno sheets (also LT1). Many thanks to Bill Sangrey, the NCRS Archives Manager! OBTW, earlier this year Bill spoke with the NCM big wigs @ the NCRS Winter Regional in Florida and tried to "spring" the dyno sheets from the vaults of the NCM Library for us, unfortunately he wasn't successful :( If they won't give them to NCRS, they ain't giving them to anyone... It's easier to get "secrets" out of the Vatican...
The attached "Interim Test Report" from GM Powertrain, done @ Lotus in Hethul England is the results of the dyno runs they apparently used when determining the advertised horsepower for the 1993 LT5. The LT5 stuff is several pages into the attachment after the LT1 stuff.
Note: the LT5 put out 445.3 hp @ 6600 rpm!!! (pretty stout!!! I'm sure this is "at the crank" horsepower and who knows if any or all accesorries were installed?)
My computer skills could use some work so I hope the attachments "work". I've never tried to attach a pdf file to a Forum post. If I screwed it up, I'm open to suggestions.
Doug
aka: Mystic ZR-1

[Blue Flame Restorations]

Cool stuff!!!

[tpepmeie]

Really interesting stats on page 5. Test 1 is the net hp, as installed with fixed calibration. In researching this, test 3 has optimized spark timing ("mbt"), but standard fueling (12:1 or even richer). Conclusion - in stock trim, there is virtually no difference due to spark advance.

Test 4 has optimized spark and fuel (Leanest Best Torque). Here there is a small gain over the baseline of 4 lb-ft and 1 hp.

Test 20 is with synonymous headers and optimized calibration.

Great info. Thanks for sharing.

[boostedmaxPSI]

Interesting things... Fuel was race fuel 103 octane for the LT1 and 98 octane for the LT5.

Did you catch the Engineers names for the LT5 test. Both names appropriate...

Thanks for sharing.

[Kevin]

This is an actual LT5 Engine Build Booklet. This documents the entire build of the engine and is all hand written by the assembly technician. LT5 Engine 046. Look at the engine closely. There are several characteristics that differ from typical production LT5 motors.

http://i46.tinypic.com/1g6vma.jpg
http://i45.tinypic.com/35a7o60.jpg
http://i45.tinypic.com/2eprrih.jpg

any chance you could scan/copy that and send me a copy? would love to add it to my zr-1 stuff folder

[Ronstar]

shouldnt the HP and Torque curves cross at 5252? something seems amiss

[ZZZZZR1]

Dyno sheet's have been discussed for years....

http://www.zr1.net/forum/showthread.php?t=12340

[Blue Flame Restorations]

Dyno sheet's have been discussed for years....

http://www.zr1.net/forum/showthread.php?t=12340


And I'm guessing they probably will be for years to come. LOL

[ZZZZZR1]

I've spent hours talking to the NCM and GM lawyers....

They aren't even interested to hear a valid arguement about why it's worth releasing them. (even selling them)

:cheers:

David

[Fully Vetted]

any chance you could scan/copy that and send me a copy? would love to add it to my zr-1 stuff folder

I'd actually be interested in a copy as well if it's possible.

[mike100]

Ignorance is bliss... I don't really need to know what my particular engine put out, but it would be interesting to know what the variation from unit to unit would be (much of which would likely be cam timing variations).

Like I said, not really losing sleep over this one.

[LGAFF]

I kind of let it go, there was some talk that pushing it GM might just destory them to avoid the hassle....

[Blue Flame Restorations]

Maybe all of my data (1988 Program Status Report and actual LT5 #046 PhaseII Engine Build Booklet) could be scanned and offered for like $20 shipped or something, if anyone was interested?

[Fully Vetted]

That's worth $20 for the hassle. What's your PayPal acct?

[Blue Flame Restorations]

That's worth $20 for the hassle. What's your PayPal acct?


Give me about a week or so and I'll get them ready.

[Fully Vetted]

You still thinking about doing this, Brett?

[alwayscode390]

Awesome stuff posted in this thread, thanks for sharing guys :) ---

[Corbusa]

I'll take one .thanks