that would be my guess.
Why ?
Thread Starter
Pro
Joined: Jan 2009
Posts: 686
Likes: 4
From: Austin Texas
Why ?
What is it about the engine in the link below, that enables it to put out about 100 HP more than the 1996 LT4 corvette engine ?
http://www.crateenginedepot.com/prod...Product_ID=764
Stroke and cam is all I can see.
http://www.crateenginedepot.com/prod...Product_ID=764
Stroke and cam is all I can see.
Last edited by ChrisWhewell; May 20, 2009 at 11:16 AM.
Instructor
Joined: Jul 2005
Posts: 232
Likes: 2
From: Bellevue NE
In addition to the cam and stroke (which I did not look at closely...), I am betting that the testing method was different. For the LT4 in the '96, that is measured with all of the accessories attached and being driven. For the crate motor, that is probably just a bare engine on a dyno.
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
The heads are GM's Fast Burns, which flow relatively well. One site shows them at 254 cfm; another site has them at 266 cfm.
The cam is 222/230 @ .050 with .543/.563 with 1.6s, so it's right around 3+ sizes up from the stock LT4 cam and even more duration and lift than the HotCam.
I couldn't verify the CR since there isn't enough info posted. I'd say, with those parts, the advertised numbers should be on target.
Jake
West Point ROCKS!
The cam is 222/230 @ .050 with .543/.563 with 1.6s, so it's right around 3+ sizes up from the stock LT4 cam and even more duration and lift than the HotCam.
I couldn't verify the CR since there isn't enough info posted. I'd say, with those parts, the advertised numbers should be on target.
Jake
West Point ROCKS!
Thread Starter
Pro
Joined: Jan 2009
Posts: 686
Likes: 4
From: Austin Texas
The heads are GM's Fast Burns, which flow relatively well. One site shows them at 254 cfm; another site has them at 266 cfm.
The cam is 222/230 @ .050 with .543/.563 with 1.6s, so it's right around 3+ sizes up from the stock LT4 cam and even more duration and lift than the HotCam.
I couldn't verify the CR since there isn't enough info posted. I'd say, with those parts, the advertised numbers should be on target.
Jake
West Point ROCKS!
The cam is 222/230 @ .050 with .543/.563 with 1.6s, so it's right around 3+ sizes up from the stock LT4 cam and even more duration and lift than the HotCam.
I couldn't verify the CR since there isn't enough info posted. I'd say, with those parts, the advertised numbers should be on target.
Jake
West Point ROCKS!
edit: @ 6000 rpm, 76 cfm is the max a single cylinder on a 350 can use at 100% VE.
Last edited by ChrisWhewell; May 20, 2009 at 12:51 PM.
Melting Slicks
Joined: Jan 2009
Posts: 3,482
Likes: 195
From: folsom california
425 hp LT4 with HOT CAM
in regards to comparing a GM 383 crate engine rated at 450 hp with an
LT series engine, please be advised that YEAR ONE markets an LT1 upgrade kit referred to as the "LT4 Conversion Kit" which includes an
LT4 "HOT CAM"; this combination is rated at (no surprise) 425 hp;
see http://www.yearone.com/pco/G_0907/full.asp?page=76
LT series engine, please be advised that YEAR ONE markets an LT1 upgrade kit referred to as the "LT4 Conversion Kit" which includes an
LT4 "HOT CAM"; this combination is rated at (no surprise) 425 hp;
see http://www.yearone.com/pco/G_0907/full.asp?page=76
Drifting
Joined: Oct 2004
Posts: 1,476
Likes: 80
From: Hawaii
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Thread Starter
Pro
Joined: Jan 2009
Posts: 686
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From: Austin Texas
It seems that LT4 was the ultimate refinement of the sbc.
Melting Slicks
Joined: Dec 2008
Posts: 2,772
Likes: 64
From: Mystic CT
I would doubt the LT4 being the ultimate SBC to be honest. And the loss from accessories is really minmal the water pump has to be used in both cases, power steering minimal unless you are truning the steering wheel same for altenator unless it is charging the battery... Look at the size of the drive belt then make your decisions about losses..
Dave
Dave