Anyone here with an LT5?
TECH Fanatic
Joined: Feb 2002
Posts: 1,329
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From: Middleburg, FL
Re: Anyone here with an LT5? Got a Black/Red 92 in the garage, working on it/retoring it for a friend, doe that count!?!? Can't wait to get it running right to go and kill some rice on the highway! <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
Re: Anyone here with an LT5? I thought it was cool that the LT5 was included in this forum <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" /> Seems many have forgotten about it.
30th TA, I think having one in your garage counts! Mine is also a '92 - black/black. I've had it for about 5 years now, but unfortunately I haven't been able to do much to it in the mod department. So far, it's got a B&B exhaust, a DRM chip, and a Vette Doctors built Super D-44 with 4.10 gears. This year I'm planning on upgrading the shifter (stock one is crap) and some C-beam plates to stiffen up the chassis. Next year the plan calls for some headers and a custom X-pipe.
Seems like everything costs an arm and a leg for these things. The LS1 is certainly much cheaper to mod <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
30th TA, I think having one in your garage counts! Mine is also a '92 - black/black. I've had it for about 5 years now, but unfortunately I haven't been able to do much to it in the mod department. So far, it's got a B&B exhaust, a DRM chip, and a Vette Doctors built Super D-44 with 4.10 gears. This year I'm planning on upgrading the shifter (stock one is crap) and some C-beam plates to stiffen up the chassis. Next year the plan calls for some headers and a custom X-pipe.
Seems like everything costs an arm and a leg for these things. The LS1 is certainly much cheaper to mod <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Teching In
Joined: May 2002
Posts: 49
Likes: 0
From: western , Massachusetts
Re: Anyone here with an LT5? >Isn't the Cadillac Nothstar engine based on the LT5 ? I'm not sure ... just asking .
Later ... <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
stay safe
Later ... <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" />
stay safe
On The Tree
Joined: Aug 2002
Posts: 149
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From: NorCal
Re: Anyone here with an LT5? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif"> Isn't the Cadillac Nothstar engine based on the LT5 ?</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I kinda wanted to know that too. What is the difference between the northstar and an LS1/LS6. I have seen pics of both. They look similar, but have never seen them in person.
I do know that the ls1/6 is a push-rod v-8 and the northstar is a 32v dohc motor. I do know that much. Laters.
I do know that the ls1/6 is a push-rod v-8 and the northstar is a 32v dohc motor. I do know that much. Laters.
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Launching!
Joined: Dec 2001
Posts: 259
Likes: 1
From: Durham, NC
Re: Anyone here with an LT5? Completely different. Northstar, LS1 and LT5 are all totally unrelated with nothing in common (except for the G and the M cast on some of their parts <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> ).
Northstar is a an aluminum block, 32 valve DOHC motor. LS1 is an aluminum block, 16 valve OHV (pushrod) motor (unrelated to the SBC). LT5 is an iron block 350 SBC with Lotus designed aluminum DOHC heads assembled by Mercury Marine.
Northstar is a an aluminum block, 32 valve DOHC motor. LS1 is an aluminum block, 16 valve OHV (pushrod) motor (unrelated to the SBC). LT5 is an iron block 350 SBC with Lotus designed aluminum DOHC heads assembled by Mercury Marine.
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Verdad Gallardo Re: Anyone here with an LT5? </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by jeromio:
LT5 is an iron block 350 SBC with Lotus designed aluminum DOHC heads assembled by Mercury Marine. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">jeromio, the Lotus heads on a SBC idea was one of the initial concepts, but far from what the LT5 became. In production trim it used an aluminum block/heads and had no correlation to the SBC whatsoever beyond 4.40" bore centers. The engine design was a collaboration between GM and Lotus (mostly Lotus, but with GM durability testing, etc). Each engine was hand built at the MerCruiser division of Mercury Marine in Stillwater, OK due to their expertise with aluminum engine technology. Each engine was also dyno tested, then shipped to Bowling Green. The LT5 was a chain-driven DOHC motor with a 3.90" bore and 3.66" stroke, it also made use of the "deep-skirt" block design. Note the similarities to the LS1.
Also, to say that the LT5 and Northstar have nothing in common is false. Yes, they share no parts between them, but remember that GM had no experience with DOHC engines prior to the LT5 program. That's why they enlisted Lotus, having been inspired by the Lotus 4 liter DOHC V8 making 350hp at the time (~1984). So its safe to say that the database of knowledge gained from the LT5 project was a huge contribution to the design of both the Northstar and the Aurora engines. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
LT5 is an iron block 350 SBC with Lotus designed aluminum DOHC heads assembled by Mercury Marine. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">jeromio, the Lotus heads on a SBC idea was one of the initial concepts, but far from what the LT5 became. In production trim it used an aluminum block/heads and had no correlation to the SBC whatsoever beyond 4.40" bore centers. The engine design was a collaboration between GM and Lotus (mostly Lotus, but with GM durability testing, etc). Each engine was hand built at the MerCruiser division of Mercury Marine in Stillwater, OK due to their expertise with aluminum engine technology. Each engine was also dyno tested, then shipped to Bowling Green. The LT5 was a chain-driven DOHC motor with a 3.90" bore and 3.66" stroke, it also made use of the "deep-skirt" block design. Note the similarities to the LS1.
Also, to say that the LT5 and Northstar have nothing in common is false. Yes, they share no parts between them, but remember that GM had no experience with DOHC engines prior to the LT5 program. That's why they enlisted Lotus, having been inspired by the Lotus 4 liter DOHC V8 making 350hp at the time (~1984). So its safe to say that the database of knowledge gained from the LT5 project was a huge contribution to the design of both the Northstar and the Aurora engines. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
On The Tree
Joined: May 2002
Posts: 136
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From: Jax, FL
Re: Anyone here with an LT5? You mean experience with actually producing a DOHC V8. They experimented with a few different set ups in the 60s.
Don't forget the Quad 4 <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Don't forget the Quad 4 <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Re: Anyone here with an LT5? Apparently the stuff from the 60's didn't carry over. What was it that they were experimenting with? There was the aluminum block Vega too, but that was a disaster. Funny how these things come back around <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
The work on the Quad4 was going on in conjunction with LT5 development and was not related. I actually owned an '88 Oldsmobile Quad4 (the first year for the engine). It was a nice little engine, but had a propensity to crack cylinder heads and blow head gaskets on the early designs like mine (I went through three head gaskets and one head). I have an Oldsmobile book documenting development of the Quad 4 and apparently they had one test engine running on durability testing log the equivalent of 700,000 miles <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
The work on the Quad4 was going on in conjunction with LT5 development and was not related. I actually owned an '88 Oldsmobile Quad4 (the first year for the engine). It was a nice little engine, but had a propensity to crack cylinder heads and blow head gaskets on the early designs like mine (I went through three head gaskets and one head). I have an Oldsmobile book documenting development of the Quad 4 and apparently they had one test engine running on durability testing log the equivalent of 700,000 miles <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />
