T&D shaft rocker arms

[V10 MOJO]

what is the right size upgrade? Roe offers several different sizes.

 

[Sean Roe]

The ratio everybody goes with is 1.7:1. (that's about as far as you can go with stock valve springs before coil bind becomes a concern).
It gives you an increase of about .032" valve lift.
The gain on a stock engine is kind of minimal for the $. But with mods, it can increase quite a bit. With the SC, we picked up a surprising 26 RWHP by changing to 1.7's intake and exhaust.
Hope that helps.

Sean

<FONT COLOR="#ff0000" SIZE="1" FACE="Verdana, Arial">This message has been edited by Sean Roe on 08-31-2002 at 10:38 AM</font>

 

[LTHL VPR]

Sean-
Was this on your 96-97 with the more aggressive camshaft? Depending on the year, your Viper may see different gains due to camshaft changes... Also keep in mind that different year Vipers come with slightly different computer programs that change A/F ratio which, in turn, effects power.

 

[varanus]

Sean, what are the possibilites with different valve springs?
If they are available I was planning on putting those on too as well as the T & D's. Once this is done is there a camshaft that will be better for the sc on my 97gts?

 

[LTHL VPR]

Sean-
Thanks for your confirmation...

We have experimented with MANY camshafts and different part combinations. The heads will dictate the camshaft profile, as well as other concerns such as smog, etc... In addition, the camshaft may likely need custom computer tuning in order to optomize A/F ratio and make strong, safe power. The wrong cam can not only minimize power, but greatly alter drivability and tuning. And yes, if you are planning to do a cam with a supercharger vs. naturally aspirated chances are your cam will be different too. On other motors that we do stroker kits with superchargers, this is one of the first questions we ask.
Hope this helps!
-Wayne

 

[Sean Roe]

Wayne,
Yes, I'm referring to the .510" lift stock cam.

Kevin,
Yes, there are different springs available. But, you need to look at the valvetrain assembly as a whole. The stock valves are two piece (that's not so great), the valve spring pressure is light (relative to the valvetrain weight) and these engines have no cam bearings (not so great either). You don't really want to just put on stiffer springs for example. The valves might not take it and you could score the cam bore (or stick the cam) in the block.

Before considering the cam / valve / valve spring upgrade route further, I suggest talking with some of the shops doing this work. There are plenty around to talk to (I'm not going to say any names as I don't want to tick somebody off by accidentally leaving them out). Do some research into it. We learned a lot about the Viper engines when we had one done by Caldwell and another by a Sprint Car engine shop four or five years ago. But, we don't offer any internal parts, only advice at this time.

There are substantial gains to be made in these areas.

Sean

 

[8AVETTE]

So what would be the best T&D for a creampuff 2002? I have headers and 3" cat back. S/C ordered.