The sound of the 1982 LU-5

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Oct 1, 2017 | 04:32 PM

CPC Norwood

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From: Ohio

The sound of the 1982 LU-5

Got my original 42,000 mile LU-5 out today and went for a spin for the first time this year. After growing accustomed to the LG-4 and LB-9 over the bulk of the summer by comparison there is a very distinctive sound from the LU-5 motor. It sounds great lopes at idle very much like an old school muscle car- yet when it is go time you find out quick it only has 165HP under the hood.

Anyone do any camshaft research on these engines?.

Last edited by CPC Norwood; Oct 1, 2017 at 04:36 PM.

Oct 1, 2017 | 04:44 PM

82tarecaro

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From: NYC

Car: 1982 Recaro TA, 1989 TTA#948

Re: The sound of the 1982 LU-5

I thought the cam was the same as the L69.

Oct 1, 2017 | 05:22 PM

chazman

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From: Chicagoland

Car: 1989 IROC-Z. Original owner

Engine: LB9. Dual Cats. Big Cam

Transmission: World Class T-5

Axle/Gears: BW 3.45

Re: The sound of the 1982 LU-5

The LU5 has the L83/LM1 cam.

Oct 1, 2017 | 06:32 PM

82tarecaro

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From: NYC

Car: 1982 Recaro TA, 1989 TTA#948

Re: The sound of the 1982 LU-5

Could be a vacuum leak lol

Oct 1, 2017 | 07:51 PM

CPC Norwood

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From: Ohio

Re: The sound of the 1982 LU-5

if it is a Vacuum leak it has had it since 1986 LOL. I like it.

As a cruiser LU-5 is perhaps the most underappreciated of the early 305's.

Oct 2, 2017 | 01:16 AM

chazman

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From: Chicagoland

Car: 1989 IROC-Z. Original owner

Engine: LB9. Dual Cats. Big Cam

Transmission: World Class T-5

Axle/Gears: BW 3.45

Re: The sound of the 1982 LU-5

Quote:

Originally Posted by CPC Norwood

if it is a Vacuum leak it has had it since 1986 LOL. I like it.

As a cruiser LU-5 is perhaps the most underappreciated of the early 305's.

A good running LU5 is a nice cruiser and the exhaust has a nice sound to it, too. The hood flaps are pretty cool as well.

Oct 2, 2017 | 08:59 AM

dmccain

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From: South Ms

Car: 89 Firebird

Engine: 355 TBI

Transmission: 700R4

Axle/Gears: 10 Bolt.Posi-3.73s

Re: The sound of the 1982 LU-5

My old 82 Pace Car LU5 had a double muffler setup on it and sounded great. I had issues with the CFI and being underwhelmed with the power I pulled it and dropped in a 350 with 882 heads and 276 cam IIRC along with a built TH350. Sure it was faster but the CFI setup was neat and today now I'm older and appreciate well kept stock cars I would leave it alone if I had another.

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Oct 2, 2017 | 09:22 AM

Twin_Turbo

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From: Enschede, Netherlands

Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98

Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI

Transmission: T5, 700R4, T5, 700R4

Axle/Gears: 3.08, 3.27, 3.45, 3.27

Re: The sound of the 1982 LU-5

As crappy performance wise as cfi is... it sounds great... and it's because of mixture imbalance between cylinders.

Oct 2, 2017 | 09:37 AM

CPC Norwood

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Re: The sound of the 1982 LU-5

Quote:

Originally Posted by Twin_Turbo

As crappy performance wise as cfi is... it sounds great... and it's because of mixture imbalance between cylinders.

Exactly! That makes perfect sense.

Oct 2, 2017 | 09:47 AM

#10

8t2 z-chev

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From: belle fourche,s.d.

Car: '82 z28

Engine: L83 5.7

Transmission: 700r4-1985

Axle/Gears: 3.42 posi

Re: The sound of the 1982 LU-5

CFI has that distinctive whistle at low RPM,small throttle opening cruise also

As I recall,LU5 does not use the L83,L69,85 LB9, ETC.cam-it used the same cam as the lower power '86 LB9.

Oct 2, 2017 | 10:04 AM

#11

chazman

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From: Chicagoland

Car: 1989 IROC-Z. Original owner

Engine: LB9. Dual Cats. Big Cam

Transmission: World Class T-5

Axle/Gears: BW 3.45

Re: The sound of the 1982 LU-5

1982 -'83 F-Body LU5: GM PN: 14088839 Hyd. Flat Tappet - Duration @ .050": 194/202 - Max Lift .383/.401 - 112 - Idle: 650 rpm
1982 -'86 F-Body LG4: GM PN: 14088841 Hyd. Flat Tappet - Duration @ .050": 178/194 - Max Lift .350/.385 - 108 - Idle: 650 rpm "Peanut Cam"
1983 -'86 F-Body L69: GM PN: 14088843 Hyd. Flat Tappet - Duration @ .050": 202/206 - Max Lift: .403/.415 - 115 - Idle: 650 rpm

As we can see, it is neither the LG4 "Peanut Cam" nor the L69 cam.

Last edited by chazman; Oct 2, 2017 at 10:24 AM.

Oct 2, 2017 | 01:27 PM

#12

Twin_Turbo

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From: Enschede, Netherlands

Car: 82 TA 87 IZ L98 88 IZ LB9 88 IZ L98

Engine: 5.7TBI 5,7TPI 5.0TPI, 5,7TPI

Transmission: T5, 700R4, T5, 700R4

Axle/Gears: 3.08, 3.27, 3.45, 3.27

Re: The sound of the 1982 LU-5

GM PN: 14088839 Hyd. Flat Tappet - Duration @ .050": 194/202 - Max Lift .383/.401 - 112 - Idle: 650 rpm

Oh beat me to it

Oct 2, 2017 | 01:34 PM

#13

dmccain

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From: South Ms

Car: 89 Firebird

Engine: 355 TBI

Transmission: 700R4

Axle/Gears: 10 Bolt.Posi-3.73s

Re: The sound of the 1982 LU-5

Bout as bad as the "peanut cam" I fought it and scratched my head over my CFI car for one whole month before yanking it and the TH200 and in with the 350/TH350 combo. The CFI setup did look cool though.