What causes that lopey sound?
11-25-2003, 10:50 PM
#2
usually it's valve overlap....when both the intake and exhaust valves are open at the same time....it has to do with longer duration camshafts...
typically you give up idle quality and low rpm quality for the engine to make power more efficiently somewhere else in the RPM band...ie....usually higher up.
typically you give up idle quality and low rpm quality for the engine to make power more efficiently somewhere else in the RPM band...ie....usually higher up.
11-26-2003, 06:01 AM
#4
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Car: 1988 Trans Am GTA Notchback
Engine: 305ci, 5.0L, TPI, HO
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Originally posted by tbfirebird
i would take that sound over any 4cyl with a blow off valve any day.
i would take that sound over any 4cyl with a blow off valve any day.
11-26-2003, 09:09 AM
#5
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Car: 91 Camaro Vert
Engine: 02 LS1, HX40
Transmission: 2002 LS1 M6
you could make a honda lope.
just rig the VTEC silinoid so that its running off the big cam at low RPM...
just rig the VTEC silinoid so that its running off the big cam at low RPM...
11-28-2003, 08:21 PM
#6
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Car: 05' GTO
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this guy i used to work with at pepboys has a 1990 or 91 eagel (sp) talon tsi awd and he's pushin about 500+ hp and the cams he has in it , it lopes like a ****, im sorry to say but it actually sounds good for a 4 banger but he's also pushin like 25-30 lbs of boost on pump gas and about 42-44 lbs on race gas.
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11-29-2003, 02:28 PM
#8
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Car: 05' GTO
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actually yeah he runs 44 lbs of boost. there isnt anything stock in the motor, the turbo is bigger then youyr head
11-29-2003, 04:28 PM
#9
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Car: '83 Z28, '07 Charger SRT8
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Originally posted by Stokdd
Whoa now....44lbs of boost? I think not.
Whoa now....44lbs of boost? I think not.
And yea, its overlap that causes that sound, but solid lifters add a nice sound to that lope too
11-29-2003, 09:27 PM
#10
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Originally posted by Timz2882
actually yeah he runs 44 lbs of boost. there isnt anything stock in the motor, the turbo is bigger then youyr head
actually yeah he runs 44 lbs of boost. there isnt anything stock in the motor, the turbo is bigger then youyr head
the 1500hp blown alcohol big block in our race truck has about 25lbs at maximum boost, granted its waaaaay more volume...just to put things in perspective though
11-30-2003, 07:50 PM
#11
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Whoa now....44lbs of boost? I think not.
-- Joe
11-30-2003, 07:55 PM
#12
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Car: 1988 IROC
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ever been to a local circle track? they sometimes have 4 cylinder series and they have really lopey sounding exhaust notes, you ought to check it out its actually pretty cool granted its got just 4 cylinders
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