C7 engine?
Drifting
Joined: Feb 2008
Posts: 1,682
Likes: 3
From: Coatesville PA
Compare the super advanced and twice as expensive GT to the Z06. Skidpad, braking, speed, "claimed" top speed, lap times, and quarter mile. Having 45 less hp and weighing almost 200 lbs less, the Z06 will run with, if not surpass the GT. Then the Zr1 came out...
Only thing that either a DOHC engine or mid engine design could enable is better launching traction. Engine in the back enables more pressure on rear tires for launching, or a DOHC engine would help it achieve the huge hp numbers GM needs to achieve but lack some of the low end torque that helps the zr1 be a monster... but also is its biggest limiting factor right now. Other then initial launching thats about it. One thing that would be nice is to see more gm engines made as tough as the stuff SVT makes(ls9 excluded).
Only thing that either a DOHC engine or mid engine design could enable is better launching traction. Engine in the back enables more pressure on rear tires for launching, or a DOHC engine would help it achieve the huge hp numbers GM needs to achieve but lack some of the low end torque that helps the zr1 be a monster... but also is its biggest limiting factor right now. Other then initial launching thats about it. One thing that would be nice is to see more gm engines made as tough as the stuff SVT makes(ls9 excluded).
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
For a ohv engine you need 1 camshaft, 16 valves, 16 rockers, 16 springs, and 16 pushrods. That's 65 moving parts not counting the pistons and crank etc. With a sohc engine you only need 2 camsI think that you meant "1" here, not two, 16 springs, and 16 valves. Thats 34 moving parts. If so desired, a ohc engine can directly actuate the valve. ... no need to quote me just to point that out.
For a one cylinder OHV engine you NEED:
2 timing gears
1 cam
2 cam bearings (w/in the block)
2 lifters
2 pushrods
2 rockers
2 rocker bolts
2 rocker pivots
2 rocker arms
2 valves
2 springs
2 retainers
4 Keepers
27
For a one cylinder OHC engine (that you want to stay running) you NEED:
2 timing sprockets
1 belt or chain (how many parts in a chain?)
1 tensioner arm (with chain)
1 tensioner spring
1 tensioner bolt
OR
1 tensioner pulley
1 tensioner pulley bearing
1 tensioner spring
1 tensioner bolt
1 tensioner pulley pivot arm
1 cam
2 cam bearings
2 cam caps
4 cap screws
2 lifters
2 valves
2 springs
2 retainers
4 Keepers
27
or
28
Using Briggs & Stratton Tech, they look pretty similar to me. However, using this "tech" won't a 200k mileage engine, make.
Pro
Joined: Jun 2007
Posts: 525
Likes: 0
From: Sometimes Miami Sometimes Orlando Florida
I'll quote you to point this out though. If you actually want the engine to RUN, and stay running, then you'll need a few more parts than that. You'll also need lifters, cam caps, and some kind of belt/chain tensioning mechanism as well. Add up those parts and lets re-count.
For a one cylinder OHV engine you NEED:
2 timing gears
1 cam
2 cam bearings (w/in the block)
2 lifters
2 pushrods
2 rockers
2 rocker bolts
2 rocker pivots
2 rocker arms
2 valves
2 springs
2 retainers
4 Keepers
27
For a one cylinder OHC engine (that you want to stay running) you NEED:
2 timing sprockets
1 belt or chain (how many parts in a chain?)
1 tensioner arm (with chain)
1 tensioner spring
1 tensioner bolt
OR
1 tensioner pulley
1 tensioner pulley bearing
1 tensioner spring
1 tensioner bolt
1 tensioner pulley pivot arm
1 cam
2 cam bearings
2 cam caps
4 cap screws
2 lifters
2 valves
2 springs
2 retainers
4 Keepers
27
or
28
Using Briggs & Stratton Tech, they look pretty similar to me. However, using this "tech" won't a 200k mileage engine, make.
For a one cylinder OHV engine you NEED:
2 timing gears
1 cam
2 cam bearings (w/in the block)
2 lifters
2 pushrods
2 rockers
2 rocker bolts
2 rocker pivots
2 rocker arms
2 valves
2 springs
2 retainers
4 Keepers
27
For a one cylinder OHC engine (that you want to stay running) you NEED:
2 timing sprockets
1 belt or chain (how many parts in a chain?)
1 tensioner arm (with chain)
1 tensioner spring
1 tensioner bolt
OR
1 tensioner pulley
1 tensioner pulley bearing
1 tensioner spring
1 tensioner bolt
1 tensioner pulley pivot arm
1 cam
2 cam bearings
2 cam caps
4 cap screws
2 lifters
2 valves
2 springs
2 retainers
4 Keepers
27
or
28
Using Briggs & Stratton Tech, they look pretty similar to me. However, using this "tech" won't a 200k mileage engine, make.
Pro
Joined: Jun 2007
Posts: 525
Likes: 0
From: Sometimes Miami Sometimes Orlando Florida
I think we have enough aftermarket companies in our vette community to overcome these issues, but there are examples of those who haven't. The BMW n54 engine is a tough nut to crack as well as the new vvt Viper engine. Some people with automatic Camaros, the ones with l99s, have been doing "ls3 conversions". My hope is that with the corvette the car is delivered in such a way as to offer aftermarket guys a step into the future instead of a challenge to get back into the past.
Last edited by PaintballaXX; Jul 26, 2010 at 10:47 PM.
Team Owner
Joined: Jan 2007
Posts: 40,718
Likes: 6
St. Jude Donor '08-'09
So basically what people are expecting is a 5.5 liter with around 450 HP and getting 30+ mpg? Do that and then get rid of Bose and put in a real audio system, upgrade the door panels, dash, console and seats. 
Instructor
Joined: Mar 2003
Posts: 153
Likes: 1
From: Prague Czech Republic
450hp (i.e. LS3 + 14 hp) is IMHO a little low, nevermind how big the engine is. We need to evolve a bit, the new Mustangs are pushing 412 hp. I'd say 500hp for base and 580-600 for Z would hit the spot.
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Drifting
Joined: Feb 2008
Posts: 1,682
Likes: 3
From: Coatesville PA
And half of the typical 54 y.o. white male that is the main consumer currently, that decided a base vette is plenty for their driving ability, will now have no choice but to get a 500+hp car and wreck them in the first month. GM (or maybe another source) has already said the 5.5liter's target is 440hp and curb weight less then 3100lbs. That means with only 28hp more then the mustang, itll still run close to a full second faster then it. HP is far from the only number you need to look at. And the GT is only as fast as it is because of super short gearing.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
They're also 'pushing' 4000 lbs. 400 hp ins a BASE 'Vette is plenty, IMO. Anyone who thinks otherwise has never put their own 'Vette on a track. -They want "the number" to brag about. And that is fine...but not practical or necessarily safe for the LCD 'Vette owner.
