[DeTomaso] Valve train

[Julian Kift]

One area often overlooked with custom cam & valvetrain is pushrod length. Did your builder go through the geometry and determine pushrod length or use generic?
 
Wasn't there also a prior discussion and suggestion to use a 1.6 rocker ratio on the exhaust side, obviously you would want to make that decision at camshaft selection time to get the overall desired lift.
 
Julian
 
> From: wkooiman at earthlink.net
> To: asajay at asajay.com; detomaso at realbig.com
> Date: Sun, 20 Mar 2011 21:20:39 -0500
> Subject: Re: [DeTomaso] Valve train
> 
> If you can hear the valve train working, something is wrong.
> 
> My guess is you ran the pan try and collapsed a lifter.
> 
> You need to check all of your pushrods to make sure you don't have any more
> bent.
> 
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
> Behalf Of Asa Jay Laughton
> Sent: Sunday, March 20, 2011 8:50 PM
> To: detomaso at realbig.com
> Subject: Re: [DeTomaso] Valve train
> 
> Best guess...
> Since it's a hydraulic system, the rocker needs to be adjusted 
> "just-right" with the proper pre-load. If it's not, it may be too 
> loose. The only other thing I can think of is that the lifter lost 
> enough pressure to -not- hold up and created slack on the pushrod.
> 
> If no damage was done, you got very lucky.
> 
> Asa Jay
> 
> Asa Jay Laughton, MSgt, USAFR, Retired
> & Shelley Marie
> Spokane, WA
> ******************************
> http://www.racingagainstautism.com
> http://www.teampanteraracing.com
> http://facebook.com/racingagainstautism
> 
> 
> On 3/20/2011 17:43, bill gaino wrote:
> > I just installed my new 408 Cleveland. Hyd rollercam. Guide plates girdle
> 7/16 studs, 3/8 push rods best parts. I specified a bullet proof valve
> train. Motor really comes on strong at 4 g rpm. Got on it hard for my
> spectators, it will break the tires at 4500 in 1 and 2nd. Then a push rod
> came out from under a rocker, or off a lifter. No damage, I put it back...
> what gives... ? not enough spring pressure? I have a 6000 rpm limit,, never
> hit it.. Ideas. should I be able to hear the valve train workin? Bill 1362
> >
> > If you want it SLICK.. bring it to SLICKUM Paint Shop www.slickpaint.com
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