N/A cams & Blown cams

[Tiger Blood]

I'm wondering can you use big N/A style cams on blown cars, why/why not?

Current cam is: Intake/exhaust lift: 0.675”
Duration at 0.050: 250 degrees intake, 270 degrees exhaust
Lobe separation angle: 114+3

Sorry if its a dumb question just no one has ever explained it to me.

[peter b]

What size engine is it going into??
Compression?
Transmission?
How you want it to drive?
What are you wanting out of it??
That a fairly large cam is it still hydraulic?

[Tiger Blood]

What size engine is it going into??
Compression?
Transmission?
How you want it to drive?
What are you wanting out of it??
That a fairly large cam is it still hydraulic?

current engine is a 440ci compression at the moment is 13.5:1 turbo 400 and no its a solid roller. drag use only

Just thinking about blowing the engine dropping comp down to boost friendly.
But i have no idea about blower cams.
I've built tough as nuts N/A engines for years but when it comes to cams for a blower or turbo I'm lost.

[ADAM 26]

you cam would be good for a blower, but for a turbo, there might be a bit too much duration on the exhaust.

[jws]

That cam will work really well on a blower setup, I would be dropping the compression down to your boost friendly ratio or use a fuel like vp c16. You may find the camshaft may even be a bit small for a 440ci depending on blower selection, desired rpm, head flow, and target hp. I also agree with adam 26 that this cam has a little bit to much exhaust duration for a turbo setup, you would find it would most probably make good power depending on turbo selection but also generate high engine temps.

[peter b]

With that cam 1 would hope your planning on running some decent lifters. If your use for the car is drag use only go to a solid cam be better and easier to rev. That cam will work it isn't that it wont is just some changes will be better to suit your application.
Have you had the engine running in NA??
Which direction are you thinking of heading supercharged or turbocharged?
Supercharger cams are not too bad to spec up but a determining factor is type of blower and how much boost
Turbo cams are a lot harder as you have to consider compressor size, location of turbos, length of exhaust runners, boost etc
Most Forced induction cams will be on a 114 115 lobe separation but going but what you have said to give the best choice for you I can't at this stage.
But 1 thing I will recommend off the bat of ditch hydraulic and go solid it is for drag racing only so you want to rev the thing hard and hydraulic lifters do have their downside they won't cop huge cams at high rpm

[Tiger Blood]

Ok great,

Thanks for the advice im planning .....well thinking of planning a 2.3L whipple supercharger. The cam at the moment is a solid.

Based on what you have said i have found a cam with similar specs its a hydraulic off the shelf cam here is the specs

248/256 .660"/.660" 114+3
this would be better suited right?
We have a friend who has this cam at the moment in his torana N/A making over 650rwhp it idles under 1000rpm and redlines at 7400rpm. peak power is made at 6600rpm.

[dogsballs]

with the big whipple as long as you're cooling it i would say that came should be ok. will be a monster!

peter b, means stay solid.

[peter b]

Yeah sorry i read it wrong stay solid dude. Less issues and able to rev more.

[Hqcoupe350]

Ok great,

Thanks for the advice im planning .....well thinking of planning a 2.3L whipple supercharger. The cam at the moment is a solid.

Way too small a supercharger for a 440ci. Go the 3.4 litre, 4.0 litre even.

Leave the camshaft you have in there.

[peter b]

Ok great,

Thanks for the advice im planning .....well thinking of planning a 2.3L whipple supercharger. The cam at the moment is a solid.

Based on what you have said i have found a cam with similar specs its a hydraulic off the shelf cam here is the specs

248/256 .660"/.660" 114+3
this would be better suited right?
We have a friend who has this cam at the moment in his torana N/A making over 650rwhp it idles under 1000rpm and redlines at 7400rpm. peak power is made at 6600rpm.


What heads does the engine have??
That cam is ok but for drag racing id want to see peak at a higher rpm you want the thing to spin. RPM is your friend and want to be still making power right up into 7000rpm so that when you shift you arent falling too low and go smack straight into the power band of the cam.
For what your application I highly doubt it will be off the shelf more like a custom camshaft

[jws]

A 2.3L Whipple is to small for 440ci. Definitely go with a Whipple but more like a 4.0L. E85, your current cam and less compression would put a horn on a jellyfish. I would stay solid also. Lastly is this a LSX motor and what heads?

[Tiger Blood]

The heads are C5R on an RHS block.

Why would a 2.3L whipple be too small? are we not talking about pushing in another 2.3L sure 4is better than 2.3 and 10 is probably better than 4.
I hate the unknown i need a book to read on this stuff...lol

I read an article by LSXTV a few weeks back which had a comparison of solid vs hydraulic both cams were the same except the solid had about 10-15thou more lift both made near identical power and torque on an engine dyno.

found the link here, interesting read.
.lsxtv.com/tech-stories/engine/dyno-shootout-solid-roller-vs-hydraulic-roller/

add the www please

[jws]

Tiger blood the reason a 4L whipple is better suited is because it can supply about 1200hp worth or air where as the 2.3L can only supply about 700hp worth of air. Why put a blower on that can only supply what your current cubes and heads could do NA.

[Tiger Blood]

Tiger blood the reason a 4L whipple is better suited is because it can supply about 1200hp worth or air where as the 2.3L can only supply about 700hp worth of air. Why put a blower on that can only supply what your current cubes and heads could do NA.

Nice so how do you work this out to convert cfm intake flow from the heads to what the supercharger can push into the heads?

[jws]

Just as a rough guide you divide the supercharger hp capability by you head flow which will give you a rough estimate on what boost you will require and as long as you dont exceed the boost capacity of the blower it will be fine. This is not an exact science as other factors are not taken into consideration like fuel type, compression, exhaust, camshaft, intercooler etc. But for yours:- 1200hp supercharger / 750 head flow equals 1.6bar or approx 24 psi. Of coarse if you want less power change the 1200hp figure to desired hp figure that doesn't exceed supercharges ability.

[VYSHSV8]

You can always go the 3.4ltr whipple and with a small amount of mods they fit under the bonnet as well

[jws]

You can always go the 3.4ltr whipple and with a small amount of mods they fit under the bonnet as well

3.4L can supply near the 1000hp mark, would be pretty cool to have a blown 440 underbonnet making stout numbers

[VYSHSV8]

3.4L can supply near the 1000hp mark, would be pretty cool to have a blown 440 underbonnet making stout numbers

Yep would be sufficient and you can O/drive them a bit to :)

[OUTAtheBloo]

Are you running this car in Super Sedan ?

Dan