• Got the Contributing Memberships stuff finally worked out and made up a thread as a sort of "How-To" to help people figure out how to participate. So if you need help figuring it out, here's the thread you need to take a look at -> http://www.corvetteflorida.com/forums/showthread.php?t=3581 Thank you, everyone! Rich Z.

1998 427 Vette

Lou G

Lou G

New member
This past weekend I watched "Pinks All Out" from Atlanta.
The winner was a 1998 Vette. The owner said that he had a boar out 427 engine.

Does that mean that he increased the cylinder displacement to 427 cubic inches? If that is the case, I assume he had to install bigger pistons and rings, right? Would he have to change the cam and lifters also?

I also wonder what the increase in horse power was.

Just curious. :shrug01:
 
Most likely he was refering to the infamous 427 "big block" engine from the 60's. I had a 427 block with a 454 crank that was bored to 462 cubic inches in a 1978 Z28. It was making 500+ HP back in 1982 with a few speed parts.
 
I saw that show. He was nailing the tree (actually Rich's arm drop) all night long. I'm sure he won more than 1 round on a hole shot.:thumbsup:
 
Lou G said:
This past weekend I watched "Pinks All Out" from Atlanta.
The winner was a 1998 Vette. The owner said that he had a boar out 427 engine.

Does that mean that he increased the cylinder displacement to 427 cubic inches? If that is the case, I assume he had to install bigger pistons and rings, right? Would he have to change the cam and lifters also?

I also wonder what the increase in horse power was.

Just curious. :shrug01:
Click to expand...

ok basics
if its a C5 or C6 chances are excellent the engines a LS1-LS7 family

usually built from one of these on a stroker build

http://www.worldcastings.com/prods_pages/blocks/warhawk.htm

example

http://airflowresearch.com/articles/article108/A-P1.htm

http://airflowresearch.com/articles/article109/A-P1.htm
 
grumpyvette said:
ok basics
if its a C5 or C6 chances are excellent the engines a LS1-LS7 family
Click to expand...

Wow, great articles. I learned quite a bit by reading both. It answered all my questions plus a lot more.

One thing I didn't understand was why peak torque (600) was reached at 4,600 RPM with HP at 526 and then decreased to 534 as RPM and HP increased to 6,400 and 650 respectively.

Thanks Grumpy. :thumbsup:
 
Sounds like a REAL nice engine to be connected to my right foot. :thumbsup: But I do wish such articles would mention the COST of such an animal. When my LS6 gets old and tired, I would really like to drop a 427 in to my C5Z. Sure do wish I knew how much that would cost so I could start saving up my pennies....
 
IIRC (it's been a while) most of these "packages" are in the 10-20k range.

What do you think Grumpy?
 
Lou G said:
Wow, great articles. I learned quite a bit by reading both. It answered all my questions plus a lot more.

One thing I didn't understand was why peak torque (600) was reached at 4,600 RPM with HP at 526 and then decreased to 534 as RPM and HP increased to 6,400 and 650 respectively.

Thanks Grumpy. :thumbsup:
Click to expand...


ok basics
horsepower (in our context)is a term used to describe the RATE at which rotational torque can be applied, as force from the engine to the drive train

http://forum.grumpysperformance.com/viewtopic.php?f=50&t=558

as the RPMS increase the amount of TIME AVAILABLE PER INTAKE STROKE DECREASES, up to some point, thats determined by the ports,runners and cam lift and the engines displacement,as the rpms increase the number of power strokes per second increase and power goes up,but at some point the time necessary to fully fill the cylinders starts to limit the flow into the cylinders and the volumetric efficiency falls off in relation to the rpm increase, this decrease in the amount of fuel air mix burning per power stroke tends to lower the torque produced PER POWER STROKE, but as the rpms increase its a trade off , of more power strokes, but less effective ones, so the power tends to increase for a bit higher in the rpm range than the torque peak, (WHICH TENDS TO FOLLOW THE VOLUMETRIC EFFIENCY CURVE VERY CLOSELY)
 
grumpyvette said:
as the rpms increase the number of power strokes per second increase and power goes up,but at some point the time necessary to fully fill the cylinders starts to limit the flow into the cylinders and the volumetric efficiency falls off in relation to the rpm increase, this decrease in the amount of fuel air mix burning per power stroke tends to lower the torque produced PER POWER STROKE, but as the rpms increase its a trade off , of more power strokes, but less effective ones, so the power tends to increase for a bit higher in the rpm range than the torque peak, (WHICH TENDS TO FOLLOW THE VOLUMETRIC EFFIENCY CURVE VERY CLOSELY)
Click to expand...

I think I got it. Same torque at higher rpms means increased hp. Torque decreases in tandem with decreased fuel/air mix burn per stroke.
:yesnod:
 
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