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May 8th, 2008, 10:07 AM
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Tapping Noise
I have a T&D Rocker setup with my roller cam (212/212) on an 87 GN motor. Someone told me that I would hear a little rocker noise when I switched to a roller cam and these rockers. It isn't very loud.
Here is a video of it Turbobird Runs! - Video Fast forward to about 30 seconds in. I was just curious if this is normal with our motors when switching to roller rockers or if they need to be adjusted. Thanks.
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 '91 Firebird - LC2 3.8, 6776S Turbo, Alkycontrol, S60 Rear, ProBuilt 700 467rwhp / 464rwtq @ 19lbs 
    
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May 8th, 2008, 10:13 AM
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Slight tapping noise on mine too nothing load.
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84GN with RPE built 109 0.30" over Forged pistons BB6776HR, Comp 218/212 Roller Iron Champion ported heads TD 1.55 Rockers Ported Intake & Plenum 62mm TB,RJC plate,3"THDP,60lb injectors TT chip,Cotton's FMIC,Mark's Cold Air Kit, Protorque 2800 for the street ALKY, RJC boost controller,Electric Cutout,Translator, LS1 MAF
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May 8th, 2008, 11:48 AM
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Quote:
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1987 GN Astroroof Precision 6131BB, BGC 23 row stretch IC, 60lb inj., 212/212 Comp roller cam, T&D rollers, TT Akly chip, Razor's Alky kit, Billet main caps, Speed-Pro forged pistons, port & polished heads & intake, 70mm T/B, Edge 10" 3000 stall L/U, trans built by mikestertwo with PTS / CK parts, 3" THDP, Poston headers, PTS aluminum radiator, etc., etc.
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May 8th, 2008, 11:59 AM
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Can't really tell from the video. It's going to sound a bit like a sewing at idle machine, but proper adjustment of the rockers will help. You'll get used to it.
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218/212 Comp roller cam, Cat stroker, RJC gridle, CPT66BB, PTE Stock Location IC, Champion iron, T&D roller rockers, 60# Mototron injectors w/Turbotweak chip, Monroe-ported throttlebody, RJC Power Plate, Jimmy-built trans w/Precision Vigilante converter, ATR SS dual exhaust, ATR rear sway, BMI upper and lower control arms, Edelbrock Performance shocks, Razor alky, Tinman cold air intake, MT street radials.
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May 8th, 2008, 05:03 PM
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What preload did you use on the lifters?...when adjusting T&D's a full turn of the adjusting screw is .050...I always do 3/4 turn which is around .037...my motor with roller and T&D's is pretty quiet...
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Scott 87 GN - Street/Show Car (orig owner - 41K miles) 87 T - Street/Race Car(10.24 - 133.49 MPH)
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May 8th, 2008, 05:27 PM
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I do a half turn to .025
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218/212 Comp roller cam, Cat stroker, RJC gridle, CPT66BB, PTE Stock Location IC, Champion iron, T&D roller rockers, 60# Mototron injectors w/Turbotweak chip, Monroe-ported throttlebody, RJC Power Plate, Jimmy-built trans w/Precision Vigilante converter, ATR SS dual exhaust, ATR rear sway, BMI upper and lower control arms, Edelbrock Performance shocks, Razor alky, Tinman cold air intake, MT street radials.
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May 8th, 2008, 06:40 PM
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Put at least another 1/2 turn on your adjusters. Mine were pretty loud before I added more preload. It's down to a slight tick now and I'm at 1 full turn.
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1987 GN Astroroof Precision 6131BB, BGC 23 row stretch IC, 60lb inj., 212/212 Comp roller cam, T&D rollers, TT Akly chip, Razor's Alky kit, Billet main caps, Speed-Pro forged pistons, port & polished heads & intake, 70mm T/B, Edge 10" 3000 stall L/U, trans built by mikestertwo with PTS / CK parts, 3" THDP, Poston headers, PTS aluminum radiator, etc., etc.
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May 8th, 2008, 08:20 PM
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I think that .050 is too much preload. .025 to .035 is plenty.
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218/212 Comp roller cam, Cat stroker, RJC gridle, CPT66BB, PTE Stock Location IC, Champion iron, T&D roller rockers, 60# Mototron injectors w/Turbotweak chip, Monroe-ported throttlebody, RJC Power Plate, Jimmy-built trans w/Precision Vigilante converter, ATR SS dual exhaust, ATR rear sway, BMI upper and lower control arms, Edelbrock Performance shocks, Razor alky, Tinman cold air intake, MT street radials.
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May 9th, 2008, 07:27 PM
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I had a similar noise with my flat tappet cam using T&D's. In my case, it was too long of a set of pushrods. It caused my my adjusters to ride up high on the rockers, and that allowed the adjusters to contact the valve covers slightly, causing a noticeable tapping as you might imagine. Getting the correct pushrod length dialed in eliminated the problem. Counterman.
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May 9th, 2008, 08:10 PM
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I'm at 1/2 turn rather have the slight noise than other issues
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84GN with RPE built 109 0.30" over Forged pistons BB6776HR, Comp 218/212 Roller Iron Champion ported heads TD 1.55 Rockers Ported Intake & Plenum 62mm TB,RJC plate,3"THDP,60lb injectors TT chip,Cotton's FMIC,Mark's Cold Air Kit, Protorque 2800 for the street ALKY, RJC boost controller,Electric Cutout,Translator, LS1 MAF
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