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-   -   1989-90 Corvette's L98 TPI HP-CR doubts (http://www.hotrodders.com/forum/1989-90-corvettes-l98-tpi-hp-cr-doubts-133864.html)

Calderone 02-22-2008 08:36 AM

1989-90 Corvette's L98 TPI HP-CR doubts
 
Let's see this 89 v/s 90 Corvette specs both TPI :

1989 :

Compression Ratio 9.5:1
Horsepower 245 hp @ 4,300 rpm (coupe w/ 3.07:1 axle)
240 hp (convert.)
Torque 340 lb-ft @ 3,200 rpm


1990 :

Compression Ratio 10.25:1
Horsepower 250 hp @ 4,400 rpm (coupe)
245 hp @ 4,000 rpm (convert.)
Torque 350 lb-ft @ 3,200 rpm (coupe)
345 lb-ft @ 3,200 rpm (convert.)

On 1990 the L98 got flat top pistons and the compression ratio increased from 9.5 :1 to 10.25:1

How come the extra compression added only 5 HP ??????
i read that they "pussified" the cam to give the engines
not too much power ....and that's why the 5 HP increase only....

Is this true ?
i cant believe that !! Did GM follow certain standards ?
thanks

DoubleVision 02-22-2008 11:25 AM

From the specs I gather the earlier L98s had 9.5:1 compression and the 1991 recieved 10:1. only a half point in compression is worth very little in means of power, a half point raise would give it about five more horses.
You can look at the year specs here:
http://www.100megsfree4.com/corvette/1990/vet91.htm

curtis73 02-22-2008 01:23 PM

A full point of compression is only worth about 3-4% power, so I think 5 hp is actually a nice gain from such a little increase in compression


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