[DeTomaso] BBORR engine failure clues

Thu Apr 30 11:44:19 EDT 2009

Ok, now back to my problem.  This engine does NOT have roller lifters.  Everytime I open a post hoping someone has
great info about my failure or is willing to give me a new engine or parts I see...JUST KIDDING, JUST KIDDING!

I'm pretty sure it looks like a broken cam with 2 cylinder's lifters down and oil in the bell housing area.  I don't have any 

experience with this.  Are there any common causes for this.  I assume it's a result of torsional loads, but?  What kind of

collateral damage is likely?  I can imagine some block damage, bent valves etc.  Thanks for any info...and that was good info on roller lifters too.  :)

Michael

> Date: Thu, 30 Apr 2009 07:58:53 -0700
> From: asajay at asajay.com
> To: detomaso at realbig.com
> Subject: Re: [DeTomaso] BBORR engine failure clues
> 
> Very good point Gray, thank you for clarifying.
> 
> Asa Jay
> 
> Quoting Gray Gregory <rgg at gregorycook.com>:
> 
> > Asa,
> >
> > You can add me to that list too. I agree with John that solid roller 
> > lifters are a problem waiting to happen and are not worth the extra 
> > hp for a street driven car, of course that's just my opinion!
> >
> > It's important that we separate solid roller lifters and hydraulic! 
> > The modern engines you talk about all have hydro roller lifters and 
> > the shock absorption effect the hydro lifters give you eliminates 
> > the problem of the needle bearings failing from the shock as the 
> > lash is taken up.
> >
> > Gray
> >
> > -----Original Message-----
> > From: detomaso-bounces at realbig.com 
> > [mailto:detomaso-bounces at realbig.com] On Behalf Of Asa Jay Laughton
> > Sent: Wednesday, April 29, 2009 11:43 PM
> > To: detomaso at realbig.com
> > Subject: Re: [DeTomaso] BBORR engine failure clues
> >
> > I don't see them as a "frequent" source of engine failure. I've seen
> > more engine failures talked about due to broken valves, overbores that
> > "windowed" a cylinder wall, broken cams, worn mechanical lifters,
> > sheared distributor pins, and the list goes on. I've only heard of one
> > failure due to a roller lifter going out, and that was today from John
> > Taphorn. So I'm not really seeing any data that roller lifters are a
> > frequent source of failure.
> >
> > For what it's worth.... most modern engines only use roller lifters now,
> > which is why most cam grinders now have lower profile grinds for use
> > with roller lifters. It used to be if you wanted to use roller lifters,
> > your cam selection was very limited, usually to strip and track only
> > grinds. Nowdays you can get a good street grind for everyday driving.
> >
> > Is it worth it? Heck yea... reduced friction, reduced load, both of
> > which lead to better gains in HP. Modern components last a lot longer,
> > etc. What's not to like about them?
> >
> > Asa Jay
> >
> > Asa Jay Laughton, MSgt, USAFR, Retired
> >
> > & Shelley Marie
> > Spokane, WA
> >
> > 1971 Mach I Mustang [ASA JAY]
> > 1973 Pantera L 5533 [ASASCAT]
> >
> > ******************************
> > http://www.asajay.com
> > http://www.teampanteraracing.com
> >
> >
> >
> >
> > pantdino at aol.com wrote:
> >> To admit my ignorance:
> >> Seems like these roller cam followers are a frequent source of engine
> >> failure.
> >> Is it really worth it? Do you really gain that many HP?
> >>
> >> Jim
> >>
> >>
> >>
> >> -----Original Message-----
> >> From: John Taphorn <jtaphorn at kingwoodcable.com>
> >> To: michael frazier <red3644 at hotmail.com>; pantera list
> >> <detomaso at realbig.com>
> >> Sent: Wed, 29 Apr 2009 8:16 pm
> >> Subject: Re: [DeTomaso] BBORR engine failure clues
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> Michael
> >>
> >> I believe that you stated you were running a solid roller lifter cam.
> >> The
> >> excess lash occurs as the needle bearings in the roller's wheels turn
> >> to
> >> dust. The base of the roller then rides on the cam lobe and the wear
> >> rapidly against one another.
> >>
> >> Welcome to solid roller hell from one who has made the journey.
> >>
> >> JT
> >> ----- Original Message -----
> >> From: "michael frazier" <red3644 at hotmail.com>
> >> To: "pantera list" <detomaso at realbig.com>
> >> Sent: Wednesday, April 29, 2009 9:36 PM
> >> Subject: [DeTomaso] BBORR engine failure clues
> >>
> >>
> >>
> >>> I had a chance to pull the distributor, intake and valve covers
> >>>
> >> tonight.
> >>
> >>> The dist. gear is pinned tight where it should be. The rockers
> >>>
> >>> (intake and exhaust) for the back two cylinders, 4 & 8, are loose and
> >>> almost off the springs. Lifters are down. That's as far as I've
> >>> got...any new thoughts? I'll keep you posted.
> >>>
> >>> Michael
> >>>
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