[Go Fast For Life]

I am building a 542 stroker motor for my car. Here are the engine specs.
4.031 bore,
4.25 stroke,
10.5 CR,
GTS-R heads cnc ported,

I need to select a hydraulic roller cam and want a peak HP at about 5600rpm and still good drivability characteristics . I am shooting for 700-725HP (crank) or about 625-650RWHP.

I am thinking about a cam with 243 intake and 246 exhaust duration at .050 and a total lift of .560.

Can any of you builders/tuners tell me if this will give me the HP and driveability I want?

 

[John Hennessey]

Your engine builder should be the one picking the cam. FYI, you will not be able to safely support 625 rw hp with the stock fuel system.

 

[Go Fast For Life]

Thanks John,

I am the one building the motor. Do you have any recommendataions? PM me if you want to keep it quiet. Thanks in advance.

Go Fast

PS. I have a return line system on the car now.

 

[Mister Bone]

From the Comp Cams site

http://www.compcams.com/Technical/CamSelection/

Can't give a correct answer without know these things. Otherwise it is a guess at best.

 

[Go Fast For Life]

Jerome,

Thanks. I'll see what CompCams says.

Go Fast

 

[Mister Bone]

Glad to help how ever I can.

You can get the cam from where ever you choose, but I just wanted to give you an example of what is involved in picking the proper cam. I have an old spec sheet from my SB Charger that is longer than that one yet. :nod:

Not a sales pitch
From my research I know that John H. knows his cams. Talk to him and see what he has to say.

 

[Torquemonster]

Those specs sound ballpark, maybe a tad small - but LCA & cam timing affects output too and you have to balance power with valve overlap you are willing to put up with.

Buy one from a Viper tuner that makes the power level you want - they got it via trial and error so won't likely give you the spec as it is their IP.

A cam grinder will - if you fill in all their data spec sheet they'll work out a custom one. Hopefully they'll get it right - if not - you could spend a bit trying different ones out.

The tuner has been there done that - I think I'd go there first.

 

[Go Fast For Life]

Torquemonster,

Thanks. Do you have a 542 also?

Go Fast

 

[JGK95]

Go Fast,

Torque is the local Engineer of the site who is always willing to help out with a computation or two. Your project is Awesome!! When I get my car, I'd like to do the exact same thing that you are currently working on. Thanks for posting.

Jay K.

 

[Torquemonster]

Torquemonster,

Thanks. Do you have a 542 also?

Go Fast

Go Fast - you are welcome.

No I don't have a 542, but your project should produce a really nice beast!!!

My own plans are for a stock bore and stroke as I plan to run a fairly serious TT with solid roller and trick heads, rods and crank so the extra cubes will weaken it's dynamics for me. If things go really well for me and I can get 2 - then I may stroke one and do something similar to what you are doing with that - it'd be nice to have both a boosted monster and a crisp high comp n/a engine.

Good luck with your project! /images/graemlins/thumb1

 

[Torquemonster]

Go Fast,

Torque is the local Engineer of the site who is always willing to help out with a computation or two. Your project is Awesome!! When I get my car, I'd like to do the exact same thing that you are currently working on. Thanks for posting.

Jay K.

Thanks for the compliment Jay K but I'm not an engineer. The tuners on this site are way more qualified than me. I'm just an enthusiast like you. Hope you can get your Viper soon!!

 

[Go Fast For Life]

Jerome, Torquemonster, and JGK95 thanks for the help.

And a BIG THANK YOU to JOHN HENNESSEY for some valuable information on the project. I look forward to putting the car on the dyno this spring. I will keep everyone updated.

Go Fast