biketopia

iTrader: (5)

So I'm helping my brother out again with his 70 Camaro build and we're trying to get an idea on what cam we should run in this car. Cam spec's are not my strong suit by any means so I'm looking to learn a little and hear what some of you much more knowledgeable folks have to say. If he gets time during the day he's going to call a few different cam companies but I figured I'd ask here as well.
Car and engine specs;
70 Camaro with Detroit Speed front sub frame, mini tubs, quadra link rear, full floater 9" yada yada
2013 ZL1 6.2L with the eaton 1.9L positive displacement supercharger blower has been ported and polishedWith the current pulley set up blower will produce close to 19 PSI @7000 engine RPM

blower snout has been ported for use with a 90MM throttle body

tr6060 manual transmission

3.50 rear axle ratio

335/30/r18 tires

Tire diameter: 26"

stock heads ported by texas speed, 660 valve springs, titanium retainers

stock valves

will run on 93 octane

bored 0.005" over

6.125" rods

aiming for a 9.0-9.5 compression ratio (pistons have not been picked out yet.)

intended use is street/autocross/ road race.

Not looking for max effort, looking for a happy medium that will make good power from say 2200-6800RPM

needs to have good street manners.

Manual brakes so vacuum is not an issue.

3250 pounds..just a guess.

Thanks again for any help or light you all can shed on the topic!

old motorhead

iTrader: (10)

How much power are you looking for? A 1.9L TVS blower spinning fast enough to see that much boost is going to be a heat pump. I don't think you'd even have a chance at controlling intake air temps if you stayed in the throttle very long.

Brian Tooly has a really good lineup of PD blower cams if you want something off the shelf.

biketopia

iTrader: (5)

Forgot to add he'll be using meth injection.

Brad de Munck

BTR PDS Stage 3 Torque 223/246 117 makes good power and torque in low/mid range and still climbs hard on the top end
I’m getting this fitted to my LSA

old motorhead

iTrader: (10)

Needs to run flex fuel. On a PD blower, meth does little to nothing for intake air temps. It does add octane, but there's really no good fail safe options for when the meth quits. On centri and turbo rigs, timing can be pulled when IAT's get too high if the meth system takes a dump. Not so on a PD blower. Meth makes little to no measurable difference in IAT's.

If you run E85, you can make 700 rwhp on an 18,000 rpm blower speed. With ported heads and a cam like Tooley's stage 3 PD cam (231/248 120+5), you can get the boost down to 10-12psi and still make excellent power.

Also, if you can swing E85 for fueling, you can up your static CR to around 11:1. That's free power without adding boost (and heat).

biketopia

iTrader: (5)

We don't really wanna run E85 as it's not super readily available by us, and not having to track down a station every time you want to take the car out for a weekend trip would be nice as well. The pulley can always be changed to better match a set up. Were not looking for max effort 1k RWHP (might of been the mind set originally but not so much now), looking for a great wide power curve for auto x and road racing, maybe in the 700ish range.

old motorhead

iTrader: (10)

I should have been more clear. By e85, I was more referring to a flex fuel system. If tuned correctly, you can run e85 or 91octane pump fuel, and anything in between. The 18,000 rpm blower speed should get you 650ish on pump 93 and 700+ on e85. The cam Brad de mentioned might be a better fit if you're not after every last HP. The final cam choice should be made when you decide on compression ratio. I'd keep static a lot closer to 11:1 vs 9.5:1. If you're limited by blower size and capability (and you are with the 1.9L TVS), lowering static compression costs you power, manners, and mpg. Pat G can get you into a custom cam that fits your goals, your hardware, and you.

You don't have the luxury of adding an infinite amount of boost. Once you get past 11 or 12 psi (assuming nice blower cam, ported heads, and a really free flowing exhaust), you're fighting a losing battle with intake air temps.

Sounds like a fun project. I've put together 4 TVS2300 rigs and a few MP122 and 112's. Every one of them was a blast to run.

biketopia

iTrader: (5)

Ahh I got you! Yea I told my brother with what it cost's vs what he's already in this build we should set it up for flex, I'll work on persuading him more. I'll forward on this info to him and see what he decides and comes up with. Open to other ideas still too, the block and crank are still at the machine shop until he picks a piston and orders rods.