sbc balance

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sbc balance

Postby v8blazer94 » Sun Sep 30, 2012 8:17 am

Ok when i have my truck in 2nd gear and ride at about 2300 rpm i can feel a viberation for a second on and off. Feels like my motor isnt balanced properly could this be from using the wrong balancer i just used a old one off another motor. That was in good shape
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Re: sbc balance

Postby FirstGenThree » Sun Sep 30, 2012 8:27 pm

If it was wrong, as in using a weighted balancer on a neutral balance crank, it would be very obvious and worsening with rpm. Can you feel it in neutral at 2300? or at that speed in a different gear? Were your engine components balanced before you assembled it?
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Re: sbc balance

Postby v8blazer94 » Mon Oct 01, 2012 10:30 am

Yea i can feel it around 2300 rpm in any gear even park i just feel it most in 2nd
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Re: sbc balance

Postby FirstGenThree » Mon Oct 01, 2012 11:03 am

It could be a balance issue with anything bolted to the crank, including the flexplate, converter or flywheel. It may also be a cylinder balance issue. What is your setup/engine? carb or efi? Is the engine stock or did you assemble it?
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Re: sbc balance

Postby Telco » Mon Oct 01, 2012 1:07 pm

Since it happens in park, have you looked under the hood while hand revving the engine to see if you can find it? If you decide to do this, hand check the fan blades very carefully before starting in case the problem is a loose blade that's getting ready to come loose. A fan blade will punch a fist sized hole through a solid steel hood and still fly several hundred feet in the air, your sternum won't even slow it down.
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Re: sbc balance

Postby v8blazer94 » Mon Oct 01, 2012 5:49 pm

No i havent Looked to much but it Isnt That bad U can only barly feel it. And i have an electric fan. Could it be something in my transmission i have a 700r4. And. Can hear A slight ticking sound From around the torque converter and can rilly hear it around the same rpm when there is the less strain on motor b4. It shifts
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Re: sbc balance

Postby v8blazer94 » Mon Oct 01, 2012 5:51 pm

And its a carbed 355 with voodoo cam
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Re: sbc balance

Postby Telco » Mon Oct 01, 2012 8:38 pm

If you are feeling it in park, the only thing in the trans it could be is the torque converter. Come to think of it, I've replaced an engine because I thought I had a knock that turned out to be a bad TC. Unfortunately my hearing is pretty bad, and I have a really hard time isolating sound.
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Re: sbc balance

Postby v8blazer94 » Tue Oct 02, 2012 7:57 am

I was thinking maby a weight Fell off My flex plate or torque converter. I'm going to pull them and see if i see any missing. Or an crack in flex plate or something
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Re: sbc balance

Postby mycamaros » Mon Oct 08, 2012 9:16 am

Cracked flexplate ?
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Re: sbc balance

Postby v8blazer94 » Mon Oct 08, 2012 9:34 am

No i didnt see no missing weights Or cracks i rilly wish i could find this noise. It gets on my nerves when its at its worse it sounds like change rattling in the bottom of my motor or tranny. But that is only at mid rpms right before it shifts.
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Re: sbc balance

Postby Telco » Mon Oct 08, 2012 10:04 am

Pull the torque converter to flexplate bolts out, then slowly rev the engine to the problem RPM. Remember that without the load of the trans the engine's going to rev a lot faster. If you don't hear the noise, then it might be a failing torque converter. If you do still hear the noise then look for any point where there's metal close to the engine and look for signs of rubbing. In fact, I'd do that anyway as without the trans to push against, the engine won't be twisting against the engine mounts.
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Re: sbc balance

Postby tk94s10ss » Wed Oct 10, 2012 8:56 am

v8blazer94 wrote:when its at its worse it sounds like change rattling in the bottom of my motor or tranny. But that is only at mid rpms right before it shifts.



My x gf's transmission was making a similar sound and it was the transmission going. How does your fluid look and smell?
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Re: sbc balance

Postby v8blazer94 » Wed Oct 10, 2012 3:26 pm

Fluid. Is clean and smells fine i thougt about That and checked it i t was rebuilt about 25,000 miles ago and i have. Done 2 filter and fluid changes
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Re: sbc balance

Postby douche_mcgee » Wed Oct 10, 2012 5:17 pm

Bigger cams with inadequate timing will cause surging and vibrations at lower rpms.
Lots of guys run into this problem when using a vac advance distributor and after market cam.

You sure the rocks in a can sound isn't the motor pinging/detonating???

I had a similar problem but solved it with a different ignition system that allowed me to precisely
control the timing at that rpm.
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Re: sbc balance

Postby FirstGenThree » Wed Oct 10, 2012 9:51 pm

^^^ what he said. As soon as you described the sound as loose change rattling around that's what came to mind. I was thinking this was a vibration also, not a noise. I think pinging almost sounds like a chirping noise sometimes. Back your timing off or try some premium fuel and see if its still there, or try to duplicate it with the engine completely cold.
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Re: sbc balance

Postby v8blazer94 » Wed Oct 10, 2012 9:56 pm

I run premium i will try timing tomarrow. And see how it works out
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Re: sbc balance

Postby v8blazer94 » Fri Oct 12, 2012 9:38 am

I tried Timing but no luck still has that annoying noise. Would this be that voodoo cams are loud. I can hear it but others cant. It is a faint sound but its all i hear
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Re: sbc balance

Postby Telco » Fri Oct 12, 2012 1:23 pm

Have you checked to make sure the distributor weights aren't hanging up, or that the advance springs aren't broken? And, have you verified that the vacuum advance is working smoothly?
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Re: sbc balance

Postby v8blazer94 » Fri Oct 12, 2012 2:21 pm

Its getting worse i can hear it at idle i tried moving timing around wile at idle and it didnt change the noise at all. So i cut a valve cover and adjusted valves wile it was running and no difrence it sounds like its mostly comeing from the rear of the motor i also un hooked the transmission and no change when I'm driving It sounds like change is in my motor
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