[DeTomaso] Rocker installation

Mon May 17 12:03:59 EDT 2010

That doesn't see right, but maybe it's common?  I had thought that the more common problem was the roller getting to close to the inside edge when the rocker arm tilted away from being perpendicular to the valve stem, but I don't have much experience.  It might be a good idea to talk to someone who has built a few Clevelands with roller rocker arms and see what they say.  But I think a lot of people don't look at this, and maybe some have failures?

The Comp Cams tech people are pretty good, maybe you should call them?

Ken

--- On Mon, 5/17/10, Henrik Svensson <hsv at traen.se> wrote:

From: Henrik Svensson <hsv at traen.se>
Subject: Re: [DeTomaso] Rocker installation
To: "Ken Green" <kenn_green at yahoo.com>, "Tomas Gunnarsson" <guson at home.se>, detomaso at realbig.com
Date: Monday, May 17, 2010, 7:25 AM

Hi Ken

Yes you are right, the roller is almost over the edge at some parts of the revolution on the intake valves but not on the exhaust. That's what makes me worried.

The heads are AFD 4V 64cc and the rockers are Comp cams (http://performanceparts.com/part.php?partID=246836)

/Henrik

Från: Ken Green [mailto:kenn_green at yahoo.com] 
Skickat: den 17 maj 2010 15:57
Till: Tomas Gunnarsson; detomaso at realbig.com; Henrik Svensson
Ämne: Re: [DeTomaso] Rocker installation

Which brand of heads and rocker arms are these?  

What looks bad to me is that as the valve opens, the roller may go over the edge?  Did you rotate the cam through 360 degrees to see the range of movement of the roller on the top of the valve stem?  The roller will be the farthest towards the outside edge of the valve when the rocker is perpendicular to the valve stem, but should still be on the flat top surface of the valve stem.

Ken

--- On Mon, 5/17/10, Henrik Svensson <hsv at traen.se> wrote:

    From: Henrik Svensson <hsv at traen.se>
    Subject: Re: [DeTomaso] Rocker installation
    To: "Tomas Gunnarsson" <guson at home.se>, detomaso at realbig.com
    Date: Monday, May 17, 2010, 4:29 AM

    Hi Tomas

    The heads are purchased complete with springs and valves. I can't find any information from the supplier that mention anything special.

    I plan to make an adjustable rush rod to see how much a shorter rod will do. But it seems strange to need different length on intake and exhaust rods?

    Henrik

    -----Ursprungligt meddelande-----
    Från: detomaso-bounces at realbig.com <http://us.mc308.mail.yahoo.com/mc/compose?to=detomaso-bounces@realbig.com>  [mailto:detomaso-bounces at realbig.com <http://us.mc308.mail.yahoo.com/mc/compose?to=detomaso-bounces@realbig.com> ] För Tomas Gunnarsson
    Skickat: den 17 maj 2010 13:21
    Till: detomaso at realbig.com <http://us.mc308.mail.yahoo.com/mc/compose?to=detomaso@realbig.com> 
    Ämne: Re: [DeTomaso] Rocker installation

    Henrik,

    Incorrect valve stem/pushrod length would cause this. Are your intake
    valves special in any way?

    Tomas

    <-----Ursprungligt Meddelande----->
    From: Henrik Svensson [hsv at traen.se <http://us.mc308.mail.yahoo.com/mc/compose?to=hsv@traen.se> ]
    Sent: 17/5/2010 1:03:03 PM
    To: detomaso at realbig.com <http://us.mc308.mail.yahoo.com/mc/compose?to=detomaso@realbig.com> 
    Subject: [DeTomaso] Rocker installation

    Hi Guys

    Take a look at my roller rockers

    http://www.garaget.org/?car=163523&image=1903688
    <http://www.garaget.org/?car=163523&image=1903688> 

    For some reason the tip of the rocker almost goes over the edge of the
    valve. Look at the intake valve of cylinder 4 for example. The strange
    thing is that on the exhaust valves they are centered but on all intake
    they are off.

    Any ideas why and what I can do? 

    /Henrik

    #1477

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