More boost for my Whipple
Oct 10, 2007 | 10:53 PM
#23
Thread Starter
Staging Lane
Joined: Oct 2005
Posts: 70
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From: Escondido, CA
The KB pully I saw looks much smaller and only had 2 screws. My Whipple has 4. The KB I was looking at was pretty old though.
Oct 11, 2007 | 02:26 AM
#24
The limitation on the single-belt 4.8/5.3 kit is that the pulley has to clear the billet front cover inside of it. There was a 2-belt 4.8/5.3/6.0 kit that used a standard-offset pulley. That kit allowed pulley sizes down to the smallest available. There are other factors limiting the smallest realistic pulley size: the redline input speed is 16,000 RPM. Also, a 6-rib belt just cannot grip a pulley any smaller than 2.5/8". These things take a LOT of power to spin up due to there being so much rapidly-rotating mass inside. (Keep in mind that at 16K input RPM the second rotor is doing over 26k RPM!)
I run a 2.5/8" pulley on a W140AX with A2W intercooler to a 383CID (6.3L) SBC. The crank pulley is 7.5" diameter, shift points set to 5600-5700RPM. It makes 8-9 psi depending on temperature. Every factor in this setup is maxed out. The 2.3L compressor really is too small and the 6-rib belt is too pathetic for what most of us want around here - especially with engine displacement larger than 6L. Anyone who can get a 3.3L unit with a huge A2W intercooler and 8 or even 10-rib drive running under a stock hood would be my hero.
Also, I used to pay $65 for pulleys. I guess that was the good ol' days.
I run a 2.5/8" pulley on a W140AX with A2W intercooler to a 383CID (6.3L) SBC. The crank pulley is 7.5" diameter, shift points set to 5600-5700RPM. It makes 8-9 psi depending on temperature. Every factor in this setup is maxed out. The 2.3L compressor really is too small and the 6-rib belt is too pathetic for what most of us want around here - especially with engine displacement larger than 6L. Anyone who can get a 3.3L unit with a huge A2W intercooler and 8 or even 10-rib drive running under a stock hood would be my hero.
Also, I used to pay $65 for pulleys. I guess that was the good ol' days.
Oct 11, 2007 | 02:24 PM
#25
On The Tree
Joined: May 2004
Posts: 161
Likes: 0
The limitation on the single-belt 4.8/5.3 kit is that the pulley has to clear the billet front cover inside of it. There was a 2-belt 4.8/5.3/6.0 kit that used a standard-offset pulley. That kit allowed pulley sizes down to the smallest available. There are other factors limiting the smallest realistic pulley size: the redline input speed is 16,000 RPM. Also, a 6-rib belt just cannot grip a pulley any smaller than 2.5/8". These things take a LOT of power to spin up due to there being so much rapidly-rotating mass inside. (Keep in mind that at 16K input RPM the second rotor is doing over 26k RPM!)
I run a 2.5/8" pulley on a W140AX with A2W intercooler to a 383CID (6.3L) SBC. The crank pulley is 7.5" diameter, shift points set to 5600-5700RPM. It makes 8-9 psi depending on temperature. Every factor in this setup is maxed out. The 2.3L compressor really is too small and the 6-rib belt is too pathetic for what most of us want around here - especially with engine displacement larger than 6L. Anyone who can get a 3.3L unit with a huge A2W intercooler and 8 or even 10-rib drive running under a stock hood would be my hero.
Also, I used to pay $65 for pulleys. I guess that was the good ol' days.
I run a 2.5/8" pulley on a W140AX with A2W intercooler to a 383CID (6.3L) SBC. The crank pulley is 7.5" diameter, shift points set to 5600-5700RPM. It makes 8-9 psi depending on temperature. Every factor in this setup is maxed out. The 2.3L compressor really is too small and the 6-rib belt is too pathetic for what most of us want around here - especially with engine displacement larger than 6L. Anyone who can get a 3.3L unit with a huge A2W intercooler and 8 or even 10-rib drive running under a stock hood would be my hero.
Also, I used to pay $65 for pulleys. I guess that was the good ol' days.
So what kind of heads and cam you got going?
Oct 11, 2007 | 10:04 PM
#26
Heads are Edelbrock E-Tec 200. They have 1.6" exhaust and 2.02" intake valves. Single spring plus dampeners setup. Supposedly they are good to 6500RPM but boost reduces that limit due to pressure against the back side of the intake valves somewhat. The cam is a Crower 00401LM (LM for late-model meaning stepped nose and smaller bolt circle compatibe with stock thrust plate.) Cam specs are 214/220 on a 114 LSA with 0.316" intake and 0.332 exhaust which works out to 0.506" intake and 0.531" exhaust with 1.6:1 rockers. It works great but this is not a "fuel economy" setup.
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