[DeTomaso] BBORR engine failure clues

[asajay at asajay.com]

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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