turbo cam

[xrcuta]

ive been grinded a cam of recently and would like some feedback if possible. i left it up to the machine shop to come up with something for my needs.

Firstly just a little info on my setup

3800 Series II stroked to 4.2
E85/E98 Fuel
Garrett GTX3582
desired boost 20-30psi

these are the specs on the card LSA is 114

Will mainly be a weekender and see a few track days and strip.

Is this cam going to suit my needs ? Sorry my knowledge on camshafts is very limited


Thankyou

 

[SHADOWII]

What is an ecotec 4.2 engine? Is this a mod'd buick engine? It appears to be able to make good power, but not a good street application. Hi-flowing heads and hi stall converter will be needed to take advantage of the cam. This is just my humble opinion of the specs.

 

[charlief1]

I'm guessing here but are you from across the pond?

 

[xrcuta]

What is an ecotec 4.2 engine? Is this a mod'd buick engine? It appears to be able to make good power, but not a good street application. Hi-flowing heads and hi stall converter will be needed to take advantage of the cam. This is just my humble opinion of the specs.

sorry, should have made myself more clear. its a 3800 GTP engine stroked to 4.2. Heads have been heavily worked and is manual... not auto

 

[xrcuta]

I'm guessing here but are you from across the pond?

haha you could say that... im from down under australia.

 

[charlief1]

So would this be the same as our 3800 Seires I or Series II engines. If it's a Series II engine you need to look at the Stage II design cams since it's basically a Stage II engine made for production use.

 

[xrcuta]

So would this be the same as our 3800 Seires I or Series II engines. If it's a Series II engine you need to look at the Stage II design cams since it's basically a Stage II engine made for production use.

yes is a series II and the same

 

[bison]

That cam wont work to well in a small turbocharged engine like this and running hyd lifters that much duration is a limiting factor itself. Looks like your compressor is good to about 76lbs/min@2.8:1 PR. Id be looking for something that will peak power around 5300-5400 tops if you are going to use that compressor for all its worth. 210-218@.050 if you want a hyd profile. There are a few decent lobes out there that will fill the cylinder really well in that rpm range and you will still have a decent spring selection and be able to run a hyd cam. Ive got a 218/218 in my 233ci and it makes peak power at 5500. I used a 6265 which likely has a very similar compressor map to the gtx3582 as far as mass flow potential@PR. The 62cea peaked around 78 lbs/min in my application at 2.8:1 PR. A slightly smaller cam may have been of benefit in my application but i didnt intend on running the 62 compressor with what i installed. If you run the duration you are planning the power band will be nipped pretty hard down low where that compressor should be working very well and the heavy valvetrain wont allow enough rpm to get the engine to peak power where it would if the valvetrain would let it. Even if you ran the compressor at 2.2:1 you would be done at 70lbs/min. Id expect the engine to be looking for a lot more than that with that much duration.

 

[bison]

So would this be the same as our 3800 Seires I or Series II engines. If it's a Series II engine you need to look at the Stage II design cams since it's basically a Stage II engine made for production use.

Its still a 90* ohv V engine. Stage block or production block the lobes will do roughly the same thing if the engine size and head flow is the same as long as the rest of the valve train is up to par.

 

[charlief1]

Its still a 90* ohv V engine. Stage block or production block the lobes will do roughly the same thing if the engine size and head flow is the same as long as the rest of the valve train is up to par.

My point was that the Series II head is configured like the Stage II heads Brian. One for a normal RWD block won't works since the intake and exhaust ports are in a different location.

 

[bison]

My point was that the Series II head is configured like the Stage II heads Brian. One for a normal RWD block won't works since the intake and exhaust ports are in a different location.

I figured he already had the cam.