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post #1 of 25 (permalink) Old Mar 18th, 10, 03:01 AM Thread Starter
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Engine vibrating

Hey guys , I just got my engine diald in . I am just wondering my engine is a GM crate 350 with a comp cam 270, a edlbrock performer intake and a 670 cfm holly street avenger carb, I used a vaccume gauge to tune the idle scews in, Now my engine at idle has a bit of a viberation, i tried turning in a half turn and out a half turn on the fuel mixture screws but nothing seems to make a difference on the viberation, the engine runs strong and has lots of response just worried about the viberation any input would be apreciated thanks
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post #2 of 25 (permalink) Old Mar 18th, 10, 04:36 AM
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Re: engine viberating

Did it vibrate before? Small shake or large shake?
Is the curb idle adjustment set for low idle? Allows idle circuit to come more into play.
If one mixture screw is turned in and lightly seated, any change? RPM should be affected by one screw, either one.
Are secondary plates open just a bit? Allows air to bypass, sometimes used to tune an engine with an aftermarket camshaft, and makes idle circuit useless if curb idle is not set lower.

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post #3 of 25 (permalink) Old Mar 18th, 10, 04:40 AM
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Re: engine viberating

sounds like the cam has a lil bump to it, thats normal, thats a hot rod motor, your good to go!!
check and make sure all plug wires are snapped on tight on both ends
make sure you dont have a pinched vac line
check carb base gasket and intake gaskets for leaks too

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post #4 of 25 (permalink) Old Mar 18th, 10, 12:37 PM Thread Starter
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Re: Engine vibrating

ok I will check all of that sorry for all the questions , this is really my first v8 hot rod lol, at least its a chevy right. and ya its only a little sake , the curb idle screw were is that ?
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post #5 of 25 (permalink) Old Mar 18th, 10, 01:09 PM
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Re: Engine vibrating

Just curious - what RPM are you setting to idle at?
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post #6 of 25 (permalink) Old Mar 19th, 10, 02:35 AM Thread Starter
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Re: Engine vibrating

the idle is around 700
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post #7 of 25 (permalink) Old Mar 19th, 10, 04:34 AM
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Re: Engine vibrating

what trans are you running and do you have a stall convertor?

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post #8 of 25 (permalink) Old Mar 19th, 10, 11:27 AM Thread Starter
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Re: Engine vibrating

I have a turbo 250 with a shift kit and no stall
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post #9 of 25 (permalink) Old Mar 19th, 10, 02:49 PM
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Re: Engine vibrating

I wonder if raised idle another 50 or so RPM if would steady out. Someone correct me if wrong but 700 may be a little on the low side for an auto tranny with your cam.

Also - are you sure you have those carb screws adjusted properly? Another technique is to adjust them where you get max vacuum reading. I turn mine while listening for max RPM (don't expect too much diff) then keep going till begins to get rough and then back out 1/2. Once at that point I would definitely notice a diff. if I cranked another 1/2 turn in. Not as noticeable on 1/2 turn out though. A little concerned may not be in the sweet spot. Timing - what did you set at?
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post #10 of 25 (permalink) Old Mar 19th, 10, 04:01 PM Thread Starter
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Re: Engine vibrating

ok I will re adjust the idle screws and turn up the idle another 50 or so , and my timimg is around 12 BTDC
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post #11 of 25 (permalink) Old Mar 19th, 10, 04:20 PM
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Re: Engine vibrating

Yeah, that cam in a 350 will have a small bit of a lump to it. (Good street cam BTW). As suggested, up the idle speed a 100 RPM,..see if she smooths out.

If not, get back to us and we'll diagnose actual engine balance problems.
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post #12 of 25 (permalink) Old Mar 19th, 10, 05:09 PM Thread Starter
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Re: Engine vibrating

hey guys i re adjusted those idle screws and turned the idle up it smoothed out alot but as I was checking things over I noticed that my hermonic balencer has a little bend to it that could couse some viberation?
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post #13 of 25 (permalink) Old Mar 19th, 10, 09:39 PM
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Re: Engine vibrating

"Bend"?...please describe.
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post #14 of 25 (permalink) Old Mar 19th, 10, 10:23 PM Thread Starter
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Re: Engine vibrating

like on the out side rim it is notched in , in one area
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post #15 of 25 (permalink) Old Mar 20th, 10, 01:59 AM Thread Starter
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Re: Engine vibrating

ok guys I got her a little more dialed in it idles at 800 and now at idle and just alittle off idle has a small miss. I put new wires and plugs in, still the same
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