Serious Investors only 1992 ZR-1 for sale
12-08-2007, 03:39 AM
#21
A hemispherical head has a combustion chamber that looks like half of a sphere resulting in the valves being unshrouded for best flow and there are no squish zones. The great flow characteristics give great HP/performance but a sphere has the highest ratio of combustion chamber surface area to cylinder bore diameter...this makes it thermodynamically inefficient resulting in poor BSFC numbers. A hemispherical combustion chamber also has poor detonation resistance (a flat head design is the only combustion chamber that is worse) due to the large combustion chamber volume and no squish zones.
The LT5 head is a pent roof (or cloverleaf) design with very low surface area to cylinder bore ratio and a perimeter squish zone making for a very efficient design with excellent resistance to knock.
PS The new "Hemi" engines from Chrysler actually are not hemispherical heads either as the combustion chamber has "squish" zones...they do have the valves across from each other, but that is the only thing they have in common with the old (real) Hemis and the valve placement does not define the type of the combustion chamber.
The LT5 head is a pent roof (or cloverleaf) design with very low surface area to cylinder bore ratio and a perimeter squish zone making for a very efficient design with excellent resistance to knock.
PS The new "Hemi" engines from Chrysler actually are not hemispherical heads either as the combustion chamber has "squish" zones...they do have the valves across from each other, but that is the only thing they have in common with the old (real) Hemis and the valve placement does not define the type of the combustion chamber.
Last edited by glass slipper; 12-08-2007 at 03:41 AM.
12-08-2007, 08:49 AM
#22
Race Director
Great discription, but I guess "semi-hemi" or "sorta hemi" just doesn't convey the right zing!
On a somewhat different note (and I'm guilty of this) it's kinda funny all the posts lamenting the ridiculously low prices of vettes, and when someone actually asks the price for one that we wish and believe they should be, we make fun of him.
On a somewhat different note (and I'm guilty of this) it's kinda funny all the posts lamenting the ridiculously low prices of vettes, and when someone actually asks the price for one that we wish and believe they should be, we make fun of him.
12-08-2007, 09:31 AM
#23
Racer
Member Since: Jul 2002
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I think that we all know that if, and when, prices do start going up on z's, they won't just double overnight-though that would be great for us owners.
Oh thanks for the description of the Hemi, I just realized how very little I know and understand about cars.
Oh thanks for the description of the Hemi, I just realized how very little I know and understand about cars.
12-08-2007, 10:12 AM
#24
Le Mans Master
Member Since: Aug 2005
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St. Jude Donor '06
I dont understand all the bashing of this guy
Does it make people feel morally superior
I believe this thread is what gives Corvette people a bad image Not that guy
I hope he gets it and more
"We have met the enemy and it is us"
Does it make people feel morally superior
I believe this thread is what gives Corvette people a bad image Not that guy
I hope he gets it and more
"We have met the enemy and it is us"
12-08-2007, 11:51 AM
#25
Melting Slicks
Education and reality are both wonderful things.
When some "expert" states that the car " will now appreciate $ 5,000.00 to $10,000.00 per year, with no basis in fact, they require either enlightenment if they are open-minded, or help if they remain steadfast in their poorly thought-out belief.
When ZR-1 owners fail to take them to task, they help perpetuate the myth that we are all elitist boneheads, that think our cars superior to all others, and that the cars themselves somehow transcend established market values.
There are a number of ZR-1's that are indeed worth 41k or more, however that combination of year, condition and mileage is not one of them as of December 2007. To say that it is so, when it is not, is simply foolish.
To subscribe to a belief that the same car will be worth 51k in two years is also a flight of fancy.
To state this truth makes no one superior, it simply states facts.
I have no problem being known as a factual Corvette owner, who has no misconceptions about what his car is worth in today's marketplace.
Th ZR-1 owners on this forum know this better than most, and simply find it silly that someone would be so far away from reality, even though we wish our cars were going to increase in value like that.
My advice to the seller would simply be as follows:
If one person tells you that you are dead, then ignore him. If twenty tell you the same thing, then you should perhaps lie down.
When some "expert" states that the car " will now appreciate $ 5,000.00 to $10,000.00 per year, with no basis in fact, they require either enlightenment if they are open-minded, or help if they remain steadfast in their poorly thought-out belief.
When ZR-1 owners fail to take them to task, they help perpetuate the myth that we are all elitist boneheads, that think our cars superior to all others, and that the cars themselves somehow transcend established market values.
There are a number of ZR-1's that are indeed worth 41k or more, however that combination of year, condition and mileage is not one of them as of December 2007. To say that it is so, when it is not, is simply foolish.
To subscribe to a belief that the same car will be worth 51k in two years is also a flight of fancy.
To state this truth makes no one superior, it simply states facts.
I have no problem being known as a factual Corvette owner, who has no misconceptions about what his car is worth in today's marketplace.
Th ZR-1 owners on this forum know this better than most, and simply find it silly that someone would be so far away from reality, even though we wish our cars were going to increase in value like that.
My advice to the seller would simply be as follows:
If one person tells you that you are dead, then ignore him. If twenty tell you the same thing, then you should perhaps lie down.
