What RPM do you run for the majority of the run. I know in years gone by
there was a lot of trouble running offshore boats at 5000-5400 continuously.
Cranks would flex and break along with main caps etc. If you dwell there a
long time it could be an issue. Have you checked for crankshaft end play
after the engine is installed? Did you run a dial indicator around the
register in the bell housing to make sure the transmission is centered
with the crankshaft. You need to do the same with the face of the bell
housing to make sure the trans is directly inline with the crank too. I
would definitely run a flex plate. The other applications run tires that are
much more compliant and dampen the shock loads considerably.
Ilk is that a term of endearment? My ex-wife used to refer to me at times
with that and she after all is my ex-wife so for her I would have to lean
towards maybe not..LOL..
----- Original Message -----
From: "23weldon" <23.weldon@comcast.net>
To: <sparky.2211@cox.net>
Cc: <land-speed@autox.team.net>
Sent: Wednesday, March 24, 2010 4:02 PM
Subject: Re: [Land-speed] Real Racing --no rant
> Sparky --
> It's hard for me to imagine how torsional vibration harmonics could create
> this problem although I'll quickly defer to the experienced wisdom of guys
> like Dave Dahlgren or his ilk. (I like that word, "ilk". Sort of fits
> Dave.)
> We usually don't worry about lateral vibrations although theoretically
> that could be an issue if the wrong kind of unbalances are present or
> clearances in the main bearings are two high.
> A few routine questions here.......
> Are you happy with all the possible misalignments and two plane balance of
> the flexplate-torque converter assembly and the transmission to block
> interface?
> How about all the oil flow passageways in the back half of the motor?
> End clearance on the crank thrust bearing?
> Anything out of the ordinary with your main bearing clearances?
> What oil temperatures do you reach at the end of a good run and what kind
> of oil do you use?
> Any possibility of weakness or out of the ordinary block distortion around
> the rear main structure under high power outputs or even from basic
> machining, checkable at assembly?
> Ed Weldon
>
> ----- Original Message -----
> From: <sparky.2211@cox.net>
> To: "AA list" <land-speed@autox.team.net>
> Sent: Wednesday, March 24, 2010 11:05 AM
> Subject: [Land-speed] Real Racing --no rant
>>I have a recuring problem---I am having issues with the back rod journals
>>and mains---We have lost these with and with out dry sump--I am begining
>>to suspect harmonics---
>> I run a flex plate with no converter and a circle track type auto pump
>> drive coupler--I am thinking of running clutch type flywheel instead of
>> the flexplate--
>> thoughts and comments thanks sparky
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