Cam ideas for 3.2-3.4L conversion?

[efhughes3]

Anyone had any experience with cam profiles with a 3.4L DME setup on a 3.2L engine. I'm going to keep it fairly stock with ARP hardware, some machining in the intake, exhaust porting, knife edge crank, bored throttle body and B&B headers (modified Steve W chip of course)

Along with Cam recommendations, a machine shop for the stuff
I'll be farming out. If I don't go with someone in Dallas, perhaps EBS would be feasible to ship to.

[camgrinder]

http://www.jonesautowerks.com/ is in San Antonio TX. I am not sure how far he is from DFW. EBS is good too.

What compression will you be running?
What RPM band do you want to have?

[efhughes3]

John:

CR will be 9.5:1. I'm really looking for enhance mid-range torque, and not sacrifice too much on topend. I'll be stock DME with re-chip.

[camgrinder]

The 964 cam is the best choice.

[efhughes3]

Thanks John

[garibaldi]

I would recommend running the compression at least 1 point higher, get some more snot out of it over 9.5., 10.5 can still be safe to run pump gas on it. The compression is what makes the power, the cam gives the motor its personality. I can do your macine work for you if you dont find anyone closer to you.

[efhughes3]

Christian: Thanks for your input. I want to basically build a "mild" & healthy hot rod. I'd looked at both the 3.2 Euro setup, and the 3.4 lower compression setup. I truly want to stay away from twin plugs at this time, although I may machine the heads while they're off to give me the option down the road.

Does 3.2 Euro 10:3-1 do anything for me on HP/torque? I'm still going to have the proper machining done for flow, cam, headers, etc.

[garibaldi]

The higher the compression, the more power and torque you can make, the explosion is more violent. Why not do a high compression 3.4?

[efhughes3]

I guess I was/am concerned about trying that on single plugs and 93 octane. I've got a line on a set of Mahle 3.4 p's and c's, 9:5-1. I can get the CR bump via head work, no?

[garibaldi]

You can get the compression up that way, but why take all that off the heads, then you have to worry about piston to valve, chains, piston to deck, etc. You could just get a set of barrels and have a set of pistons made to the compression you want, that woudl be easier and more efficient. I have a post up here on a set of Wisecos I just had made for a 930, where the guy wanted the same thing to get the comp up, but when I figured how much was needed to remove, it was better just to get better pistons.

Besides, as a side note, most of the stuff I have found to be advertised as something, turns out to be lower than claimed. So you have to check anything you get. The last set of Mahle 7.5:1 p/cs I had in here, turned out to be 6.9:1 when I poured the motor, and that was with the heads milled, and a smaller gasket. Thats when I had the pistons made and now when I pured the motor, the numbers work out to 8.05:1- we were shooting for 8:1

[camgrinder]

I agree with Christian on the CR bump. Use a set of super cup cams (Slightly hotter than 964's) and the 10.5CR will work with pump gas.

[Jeff Alton]

With single plug???

Jeff

[camgrinder]

With a larger cam the intake closes a little later on the compression stroke. This traps less of the swept volume reducing the dynamic compression.
Play with this calculator and you will get the idea
http://kb-silvolite.com/calc.php?action=comp

[efhughes3]

OK- I've got the message here CR and displacement together will "do it". But, which would be better if you only chose one? 3.2 high CR, or 3.4 lower CR? I've read a lot of scary stuff about the high CR and detonation, but it makes sense that the cam would act as a pressure relief valve of sorts with the right overlap.

Camgrinder: Do you have a cam grinding business? Or work for one? Website?

Christian: I'm probably going to need to ship stuff off one way or another, so we'll talk at some point. Do you have a website?

[camgrinder]

Yes, Yes

[Jeff Alton]

Very cool link John, thanks. Hmmm, I have been holding off on a high C/R 3.4 because I did not want to spend the dough on twin plugs.


Thanks, Jeff

[garibaldi]

Yes, No No website