[DeTomaso] NPC: DOHC or Pushrod holy war.....Was: New CorvetteEngine

[Will Kooiman]

I think it really boils down to this...

DOHC has many advantages - rev higher, more hp per cubic inch, etc. - but it
comes at the cost of more complexity.

The biggest problem with DOHC engines is they tend to be smaller
displacement.

The other problem is the complexity doesn't seem to be worth it.  DOHC has
lots of small improvements over pushrod.  The only one I consider a big
improvement is the ability to rev 8,000 without mongo springs.

-----Original Message-----
From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
Behalf Of Sean Korb
Sent: Saturday, June 04, 2011 8:39 AM
To: List Pantera
Subject: Re: [DeTomaso] NPC: DOHC or Pushrod holy war.....Was: New
CorvetteEngine

I would very much like a pushrod engine with two camshafts.  The lower
for exhaust and the upper camshaft for intakes.  Then you could have
independent and variable movement of intake and exhaust in the same
small lightweight package.

Not a new idea.  Ford was going to try this on their big block can-am
cars, but they quickly changed the rules.

sean

On Sat, Jun 4, 2011 at 8:58 AM, corey price <coreyjprice at gmail.com> wrote:
> Okay, I just have one comment:
>
> DOHC makes it much easier and cheaper to implement independent
intake/exhaust variable valve timing.
>
> Just my two cents.
>
>
>
>
> On Jun 3, 2011, at 1:43 PM, Dave Londry wrote:
>
>> Now if you said:
>> "There is no reason to build a DOHC engine instead of a SOHC engine"
>>  - I could get that. Twin cams are just more shit to keep spinning and
>> the width is ugly,
>>     So long as you manage to place big valves, across a hemi chamber, a
>> single cam is fine.
>>
>> But a pushrod with in-line valves - that's just still more heavy shit to
>> keep moving and to no benefit.
>>
>> Now the direct injection system in the new LS is very fine - keep that
part.
>> dave
>>
>> (duckin' and weavin')
>>
>>
>>
>> On 6/3/2011 12:28 PM, michael frazier wrote:
>>> Weak...very weak.  If you want to start a holy war, well then:
>>>
>>> I hope the new Vette doesn't go to a OHC engine more like the high-end
Euro competition.  That would be a step
>>> backwards in performance if it ran like a F-car or Lambo.  Ford now
builds engines bigger on the outside that an old Hemi,
>>> smaller on the inside than a 289, and just overly complicated.  I think
you're now required to put your testicles in your
>>> purse when you buy a new (plastic magnet) Mustang.
>>>
>>> On an only slightly more serious note...I don't think they would gain
anything over the LS engines.  Those are beautiful
>>> engines capable of much much more than they than come off the assembly
line with.  Pushrods, overhead cams,
>>> in the real world one's not "better", they're just different.
>>>
>>> Michael Frazier
>>> Gruppo Rompiculi Corsa
>>> Pushrods are better.
>>>
>>>
>>>
>>>> Date: Fri, 3 Jun 2011 15:07:01 -0400
>>>> From: rob at dumoulins.net
>>>> To: detomaso at realbig.com
>>>> Subject: [DeTomaso] NPC: DOHC or Pushrod holy war.....Was: New Corvette
Engine
>>>>
>>>> Personally, I believe a Dual Overhead Cam design is superior and
wondered
>>>> why it took so long for US manufacturers to adopt it in their high-end
>>>> motors.
>>>>
>>>> Flame On
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-- 
Sean Korb spkorb at spkorb.org http://www.spkorb.org
'65,'68 Mustangs,'68 Cougar,'78 R100/7,'60 Metro,'59 A35,'71 Pantera #1382
"The more you drive, the less intelligent you get" --Miller
"Computers are useless.  They can only give you answers." -P. Picasso
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