Prototype Engines - ZR-1 Net Registry Forums

USAFPILOT · 02-04-2011

Didn't GM build some 450HP LT5's that were gong to be installed on the 96 and up ZR-1s before the canceled the LT5? Did any ever find their way out of GM to a private parties hands?

Kevin · 02-04-2011

grahm at lpe had several next gen lt5's, not sure where they went

tccrab · 02-04-2011

I'd heard that a few of these engines exist but I've never seen a picture of one.

TomC

USAFPILOT · 02-04-2011

Quote:

Originally Posted by tccrab

I'd heard that a few of these engines exist but I've never seen a picture of one.

TomC

me either...they probably look the same, but I'd like to see.

A1990 · 02-04-2011

There were going to be differences, one injector/cylinder, variable cam timing to name a couple. Looks different too. This picture is from the 2008 Gathering.

tomtom72 · 02-05-2011

At the 20th anni gathering over at JVD's BBQ I listened to Mr. Mclellan explain that they had a redesigned LT5 that was done to fit inside a C5. The motor was a clean sheet of paper because the C4 LT5 would not fit in a C5 as it was too tall and the C5 hood would hit our motors.

This next part I'm almost 100% positive of....Mr McLellan said that in 90/91 they had a C5 chassis, less the rear transmission as it wasn't ready yet, under cobbled together C4 body panels with a clam shell lowered to simulate the underhood clearance of the new C5. It was a test car to do testing on the C5 chassis & suspension, and it had one of these new LT5's in it and they were driving it around BG to test it! I swear I heard Mr. McLellan say that....I nearly fell off of my chair as he went on to list some of the improvements to the motor and that Lotus did this new motor specifically for the C5 program. It was rejected ofcourse due to costs?

It had the specific bore spacing that Lotus had wanted to use to suit the 4 valve head, it was to be a MAF system, one injector per cylinder, VVT, it met emissions for OBDII, it had no gas guzzler tax including the ZO6 version of the motor, and they even had a version to use in the C5 ZR-1. I think I remember that the ZO6 version was to have 600 hp, and the ZR-1 version was to be close to 700 hp w/ a gas guzzler tax ( I'm not 100% sure on that as I think I was crying by then! ) and that the regular corvette base LT5 was 450 hp! Oh, forgot this part, Mr. McLellan said that all these motors were N/A.....I think that's why I was crying or writhing in pain by then. Can you imagine what the reception would have been like for the C5 with 450 hp as the standard motor?!? I mean the car was a hit with the new chassis.

I know one thing....when I was looking to buy back into the corvette hobby back in 04 the only C5 that held my interest was the ZO6....the "standard" vette not so much. I chose my car to spend my cash on, my 90. If the C5 had used the new LT5 I would have taken a loan to buy a new ZO6 rather than buy a C4 ZR-1....I know you can have me turn in my power key, but the C5 chassis is ( IMHO ) just that little bit better than the C4 chassis.

Tom

xlr8nflorida · 02-12-2011

Would make a good Yacht Anchor! Looks kinda heavy

WB9MCW · 02-13-2011

bdw18_123 · 02-13-2011

Thanks for posting up those pics, WB9MCW!

cvette98pacecar · 06-23-2011

Now that engine would be a lot easier to keep clean.

02-04-2011	#1
USAFPILOT Join Date: Aug 2007 Location: Spring TX Posts: 1,348	Prototype Engines Didn't GM build some 450HP LT5's that were gong to be installed on the 96 and up ZR-1s before the canceled the LT5? Did any ever find their way out of GM to a private parties hands?

02-04-2011	#2
Kevin Join Date: Jun 2005 Location: pittsburgh Posts: 4,632	Re: Prototype Engines grahm at lpe had several next gen lt5's, not sure where they went __________________ It's not the car, it's the people - Doug Johnson 90 r/r "KEYS ON" nick named "T.L.B"

02-04-2011	#3
tccrab Join Date: Oct 2004 Location: Folsom CA Posts: 1,653	Re: Prototype Engines I'd heard that a few of these engines exist but I've never seen a picture of one. TomC __________________ TomC '90ZR1 #792 Honorary Pirate [B]If it ain't FUN, you're doing something terribly WRONG. [/B]

02-04-2011	#5
A1990 Join Date: Dec 2003 Location: Grand Island NE Posts: 1,512	Re: Prototype Engines There were going to be differences, one injector/cylinder, variable cam timing to name a couple. Looks different too. This picture is from the 2008 Gathering. __________________ Dennis Fierstein 90 ZR-1 #2562 Atomic-Z ZR-1 Net Registry Chairman of the Board ZR-1 Net Registry Treasurer Last edited by A1990; 02-12-2011 at 12:25 PM.

02-05-2011	#6
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: Prototype Engines At the 20th anni gathering over at JVD's BBQ I listened to Mr. Mclellan explain that they had a redesigned LT5 that was done to fit inside a C5. The motor was a clean sheet of paper because the C4 LT5 would not fit in a C5 as it was too tall and the C5 hood would hit our motors. This next part I'm almost 100% positive of....Mr McLellan said that in 90/91 they had a C5 chassis, less the rear transmission as it wasn't ready yet, under cobbled together C4 body panels with a clam shell lowered to simulate the underhood clearance of the new C5. It was a test car to do testing on the C5 chassis & suspension, and it had one of these new LT5's in it and they were driving it around BG to test it! I swear I heard Mr. McLellan say that....I nearly fell off of my chair as he went on to list some of the improvements to the motor and that Lotus did this new motor specifically for the C5 program. It was rejected ofcourse due to costs? It had the specific bore spacing that Lotus had wanted to use to suit the 4 valve head, it was to be a MAF system, one injector per cylinder, VVT, it met emissions for OBDII, it had no gas guzzler tax including the ZO6 version of the motor, and they even had a version to use in the C5 ZR-1. I think I remember that the ZO6 version was to have 600 hp, and the ZR-1 version was to be close to 700 hp w/ a gas guzzler tax ( I'm not 100% sure on that as I think I was crying by then! ) and that the regular corvette base LT5 was 450 hp! Oh, forgot this part, Mr. McLellan said that all these motors were N/A.....I think that's why I was crying or writhing in pain by then. Can you imagine what the reception would have been like for the C5 with 450 hp as the standard motor?!? I mean the car was a hit with the new chassis. I know one thing....when I was looking to buy back into the corvette hobby back in 04 the only C5 that held my interest was the ZO6....the "standard" vette not so much. I chose my car to spend my cash on, my 90. If the C5 had used the new LT5 I would have taken a loan to buy a new ZO6 rather than buy a C4 ZR-1....I know you can have me turn in my power key, but the C5 chassis is ( IMHO ) just that little bit better than the C4 chassis. Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

02-12-2011	#7
xlr8nflorida Join Date: May 2008 Location: USA Posts: 1,096	Re: Prototype Engines Would make a good Yacht Anchor! Looks kinda heavy

02-13-2011	#8
WB9MCW Join Date: Dec 2003 Location: McHenry, Il. Posts: 6,607	Re: Prototype Engines __________________ http://i119.photobucket.com/albums/o...9mcw/SIG-2.jpg http://i119.photobucket.com/albums/o128/wb9mcw/vcm.gif "The Budget should be balanced, the Treasury should be refilled, public debt should be reduced, the arrogance of officialdom should be tempered and controlled, and the assistance to foreign lands should be curtailed, lest Rome will become bankrupt. People must again learn to work instead of living on public assistance." - Cicero, 55 BC " We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution." - Abraham Lincoln Last edited by WB9MCW; 02-13-2011 at 06:29 AM.

02-13-2011	#9
bdw18_123 Join Date: Apr 2009 Location: Prather, CA Posts: 809	Re: Prototype Engines Thanks for posting up those pics, WB9MCW! __________________ [IMG]http://i13.photobucket.com/albums/a292/bdw18_123/_zr1netforumsigphoto.jpg[/IMG][B] 1990 Corvette ZR-1 [/B][I] White/Flame Red, #2299, mostly stock, 144K miles.[/I] -Cams timed to the '93-'95 405HP LT5 stock timing. -IAT sensor relocated to below front bumper. -Haibeck hoops installed in airduct. -OBX cat-back exhaust. [COLOR=DarkRed][B](SOLD - December 2012 [/B][/COLOR][COLOR=DarkRed][B]:hello:)[/B][/COLOR] 1993 Corvette Coupe Black/Black, 6-speed (SOLD - October 2009 :hello:)

06-23-2011	#10
cvette98pacecar Join Date: May 2011 Location: Sydney, Australia Posts: 2,479	Re: Prototype Engines Now that engine would be a lot easier to keep clean.