Harmonic Balance Question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

bpmcgee · 08-16-2003, 11:39 PM

Hey there,

Why did trucks get bigger harmonic balancers than cars? I'm rebuilding a 350 that was originally from a car to go into my Blazer. I figured I'd get a larger harmonic balancer for it, but I was curious if I would run into any problems. I can't imagine what they'd be.

Thanks,

Brian

jimfulco · 08-16-2003, 11:47 PM

The larger one does a better job of suppressing torsional vibration. High-performance versions of car engines (Z-28, etc.) used the larger dampers.

phantom dually · 08-16-2003, 11:50 PM

I agree

Mike76251 · 08-17-2003, 12:13 AM

Yep.......that's why

cableguy0 · 08-17-2003, 12:21 AM

actually the big ones keep the rpms up once they are up in a heavy vehicle. in a quick revving lighter vehicle you want the small one but in heavy truck you want the big one

bpmcgee · 08-17-2003, 08:29 AM

Thanks again, guys! You always come through!

Brian

08-16-2003, 11:39 PM	#1
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Harmonic Balance Question Hey there, Why did trucks get bigger harmonic balancers than cars? I'm rebuilding a 350 that was originally from a car to go into my Blazer. I figured I'd get a larger harmonic balancer for it, but I was curious if I would run into any problems. I can't imagine what they'd be. Thanks, Brian

08-16-2003, 11:50 PM	#3
phantom dually Project92 SWB stepside Join Date: Feb 2003 Location: Louisville KY Posts: 4,793	I agree __________________ 92 C1500 stepside 496 Stroker Competiton Engineering Ladder bars/QA1 coilovers. Dana 60 rear with 4.10 gear and posi. Bonspeed Palisade 20x12 in rear w/335/30/20 and 20x8.5 front w/245/40/20. 5/8 drop with Belltech springs/DJM spindles/drop shocks. WWS Progress thread http://67-72chevytrucks.com/vboard/s...d.php?t=140448

08-17-2003, 12:21 AM	#5
cableguy0 Senior Member Join Date: Apr 2000 Location: Delta,Pa Posts: 14,950	actually the big ones keep the rpms up once they are up in a heavy vehicle. in a quick revving lighter vehicle you want the small one but in heavy truck you want the big one __________________ Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member.

08-16-2003, 11:47 PM	#2
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	The larger one does a better job of suppressing torsional vibration. High-performance versions of car engines (Z-28, etc.) used the larger dampers.

08-17-2003, 12:13 AM	#4
Mike76251 Senior Member Join Date: Mar 2003 Posts: 2,500	Yep.......that's why

08-17-2003, 08:29 AM	#6
bpmcgee Registered User Join Date: Mar 2003 Location: Northern Illinois Posts: 2,181	Thanks again, guys! You always come through! Brian



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