[DeTomaso] Vibration Help / Buttonwillow

[Dan Courtney]

The vibration on The WInged Warrior starts around 1,200 rpm and probably gets worse at higher rpm, although I guess harmonics may make it harder to tell.
I've finally given up on tracing this and and am headed to Buttonwillow to catch day 2 of Saxton's track event.
So far I've changed plugs, re-set timing to 34 total advance, and tried my back-up carb.
The vibration is from the engine, you can feel it while revving in neutral or when driving.
This was a new install but I don't think it shook this bad on the way to Vegas, so I don't think the installer used an externally balanced flywheel on an internally balanced engine, as I've been told to fear. (Flywheel is off my Centerforce set-up from the previous 351c, this engine was bought used and refreshed with new bearings and rings). Flywheel was put on by the installer, not the machine shop.
I'll back off the mounts at the track, but I don't see how they could have gotten tighter during the Vegas trip.
I'll look for other sources of engine problems (I checked and the harnonic balancer TDC mark is correctly lined up, it has new MSD wires and a new MSD cap).
I'd appreciate any suggestions because I don't want to hurt something at the track.
Almost every bolt was finger loose from the install and I no longer have confidence in the machine shop either, so I'm fearing the worst, which would be a crank vibration due to mis-matched flywheel or loose flywheel bolts, but I'd hate to pull the ZF if not necessary. I've been told a crank vibration will trash my main bearings...

Dan Courtney 


 ORIGINAL MESSAGE----------------------------------------------


I backed off on the motor mount bolts and that seemed to solve the vibration 
problem.
Is an externally balanced motor vibrate much more than an internally 
balanced motor? I guess I'm asking if I get the motor internally balanced, 
will the car drive smoother?
Will (lumpy) D.

----- Original Message ----- 
From: "bill gaino" <gaino at earthlink.net>
To: "Will Demelo" <wdemelo at cogeco.ca>
Sent: Friday, May 04, 2007 4:50 PM
Subject: Re: [DeTomaso] Fw: Vibration Help


> Uh Oh!   You may have a problem with the flywheel install. I ordered a 
> clutch for 1362..had to send back... bought flywheel and centerforce from 
> Hall.. 800 bucks. teh flywheel will only bolt up one way. See if you can 
> look or use a dial indicator on the flywheel through to access hole. See if 
> you can slowly turn the motor and make sure that there is not execceve run 
> out on the cluthe house too. You can use a peice of stick or somthing to 
> just touch the rotating part...then rotate the crank 90 degrees or so..
> .....Bill
>
> -----Original Message-----
>>From: Will Demelo <wdemelo at cogeco.ca>
>>Sent: May 4, 2007 2:42 PM
>>To: bill gaino <gaino at earthlink.net>
>>Subject: Re: [DeTomaso] Fw:  Vibration Help
>>
>>My car was running fine last year before winter. I removed the ZF and sent
>>the car in for paint. I then installed a new clych and flywheel, and
>>reinstalled the ZF.
>>I also felt the motor mount nuts were tightened against the shoulder of 
>>the
>>bolts and were not tightened against the rubber donuts. So I installed a
>>couple more washers and retightened the motor mounts ( real tight).
>>Those are the onlt 2 things I did.
>>It shakes alot above 2500 rpm. It shakes just revving it in neutral. So 
>>bad
>>that I can barely see out the rear view mirror.
>>Will
>>
>>----- Original Message ----- 
>>From: "bill gaino" <gaino at earthlink.net>
>>To: "Will Demelo" <wdemelo at cogeco.ca>
>>Sent: Friday, May 04, 2007 11:22 AM
>>Subject: Re: [DeTomaso] Fw: Vibration Help
>>
>>
>>> Will, when did this vibration start? Sorry I missed some or your early
>>> posts.  Bill
>>>
>>> -----Original Message-----
>>>>From: Will Demelo <wdemelo at cogeco.ca>
>>>>Sent: May 3, 2007 3:33 PM
>>>>To: detomaso at realbig.com
>>>>Subject: [DeTomaso] Fw:  Vibration Help
>>>>
>>>>Well, it's not the fouled plugs. Changed them and it's still shaking.
>>>>Going to check the engine mounts and restore to the way it was last 
>>>>year.
>>>>Next, I'll remove the ZF again and check the flywheel.
>>>>Will
>>>>----- Original Message ----- 
>>>>From: JDeRyke at aol.com
>>>>To: wdemelo at cogeco.ca ; detomaso at realbig.com
>>>>Sent: Thursday, May 03, 2007 3:05 PM
>>>>Subject: Re: [DeTomaso] Vibration Help
>>>>
>>>>
>>>>In a message dated 4/30/07 2:50:26 PM, wdemelo at cogeco.ca writes:
>>>>
>>>><< I've got a burnt ignition wire (from the header) and perhaps a fouled
>>>>plug. Could this cause a vibration? >>
>>>>
>>>>Yes- the engine will 'miss'. Running on 7 cylinders even intermittently,
>>>>any
>>>>V-8 will shake. Over- or under-tightened engine mounts will also likely
>>>>cause
>>>>a shake, as will plugged carb jets, excess ignition advance, etc. Garage
>>>>work
>>>>for you this weekend, Will! Good luck- J Deyke
>>>>************************************** See what's free at
>>>>http://www.aol.com.
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>>

Dan F. Courtney


Excalibur Commercial Real Estate Services
La Jolla, CA

Phone (858) 551-5455
Fax (858) 551-5456