engine vibration...how to define??

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Oct 17, 2003 | 10:13 AM

corvette90

Thread Starter

Burning Brakes

Joined: Nov 2000

Posts: 810

Likes: 4

From: Austria

engine vibration...how to define??

hi all

maybe sound a stupid question..but, here ist is

i have a lumpy idle, because i´ve a unknown cam in it...(a little car shaking)

when i spin the engine up to about 4000rpm, i can feel vibrations in the shift lever, you can feel the " rotation", but nothing car shaking, or something

is this considered normal? or should i have the crank balanced? ( i hope not)

thank you

Oct 17, 2003 | 03:09 PM

Ray383

Racer

Joined: Feb 2003

Posts: 491

Likes: 2

Re: engine vibration...how to define?? (corvette90)

I had the same problem in my Chevy truck. Turned out to be the sparkplugs weren't gap right.

Oct 17, 2003 | 03:39 PM

corvette90

Thread Starter

Burning Brakes

Joined: Nov 2000

Posts: 810

Likes: 4

From: Austria

Re: engine vibration...how to define?? (Ray383)

hi..

sounds interesting...

ok, will check plugs and spark tomorrow, and see if something change..

can i balance the crank with damper and flywheel installed??

must it be dynamic balanced, oder static??

i want to use mus stock piston and rod assemblys..can i??

thank you

Oct 18, 2003 | 04:02 AM

corvette90

Thread Starter

Burning Brakes

Joined: Nov 2000

Posts: 810

Likes: 4

From: Austria

Re: engine vibration...how to define?? (corvette90)

help me...please.. :cheers:

[Modified by corvette90, 10:19 AM 10/18/2003]

Oct 18, 2003 | 12:44 PM

Ray383

Racer

Joined: Feb 2003

Posts: 491

Likes: 2

Re: engine vibration...how to define?? (corvette90)

Why do you think its the crank? I would make sure its not the ignition system first. Check the plugs, wires, cap, and rotor. Do all the plugs look the same? Check fuel pressure and regulator. Any trouble codes? Also try spraying some WD-40 around the intake and runners to check for a vac. leak. If none of those work, try a compression test.

Oct 18, 2003 | 11:29 PM

87NassauBlue

Racer

Joined: Oct 2002

Posts: 293

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From: Newnan Ga

Re: engine vibration...how to define?? (corvette90)

Quote:

hi..

sounds interesting...

ok, will check plugs and spark tomorrow, and see if something change..

can i balance the crank with damper and flywheel installed??

Could be something stupid like plug wires.

must it be dynamic balanced, oder static??

i want to use mus stock piston and rod assemblys..can i??

thank you

Oct 18, 2003 | 11:39 PM

severe-1

Racer

Joined: Jun 2002

Posts: 411

Likes: 0

From: Palm City FL

Re: engine vibration...how to define?? (corvette90)

You may want to check the harmonic balancer. When they get old, they tend

to move around. When I discovered mine was bad, it was practically off and

rubbing on my timing chain cover. It looked like a rubber seal was coming

out of it.

Having your crank rebalanced is a TON of work for MOST of us on this forum.

Oct 19, 2003 | 11:15 AM

corvette90

Thread Starter

Burning Brakes

Joined: Nov 2000

Posts: 810

Likes: 4

From: Austria

Re: engine vibration...how to define?? (severe-1)

i checked the balancer and its in fine condition, doesnt rub at all, its tight and no rubber out of it...

i now, balancing is a ton of work, especially here in Austria, where V8-Engines are relatively rare..

but, what should i say..its more than a car for me, i always dreamt of own one, since i was ten years, it was my big dream....and im willing to spend the money and the time, i want it to run perfectly :rolleyes:

other opinions??

thank you