Camshaft for radix?

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Jun 26, 2006 | 02:44 PM

#11

TurboGibbs

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From: Decatur, AL

I ran a 216/224 .558 lift 114lsa cam on my Radix'd 4.8 5 speed and put down 445rwhp/489rwtq w/3.0 pulley(12.5lbs boost) and Pacesetter long tubes. I really liked it. Idle was very noticable with a small chop. I was running 100% meth injection as well. The cam above is basically the same as the famous "trucker" cam.

Last edited by mjhoward; Jun 26, 2006 at 07:43 PM. Reason: wrong cam lift

Jun 26, 2006 | 03:59 PM

#12

CamKing

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Quote:

Originally Posted by j.whitten

So after reading around a bit I found out lope is bad for a blower motor and I need a wide LSA.

I don't know what the stroke is it's just a stock 4.8. I just want to moves the torque up some so it's more useable, Somewhere around 2500- 3200 is what I would guess.

With the stock stroke(83mm), you won't need much of a cam to do what you want to do.

The one of mine I would recommend is a custom grind. If you want to look for someone elses cam in the same spec range, here's the numbers.

270/278 @ .006"
212/218 @ .050"
126/129 @ .200"
.312"/.312" Lobe Lift
.530"/.530" Valve Lift
116-deg lobe seperation.

Since the intake side is under pressure from the blower, you don't need a radical cam profile, or a high amount of valve lift. This cam would move the Trq-peak up about 1,000rpm and give you zero valvetrain problems.

Jul 16, 2006 | 11:27 AM

#13

1SlowHoe

Destroyer of Transmissions

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From: Orlando, FL

Quote:

Originally Posted by meatwad

Reverse split is one with more intake than exhaust.

See, shows what I know. I thought it was the other way around. So did you make a cam choice yet?

Jul 18, 2006 | 09:42 PM

#14

Brent C.

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Joined: Jul 2006

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Quote:

Originally Posted by CamKing

Do not put a reverse split cam in a blower motor.
You will have high-temp problems.
If you boost the engine with 7 pounds, you are filling the cylinder with 1.5 times the amount of air that the engine would see without the blower.
The blower helps air get into the cyl, but it doesn't help it get out. The piston is responsible for that, and if you cut down the degrees the exhaust valve is open, you will increase the pressure working against the piston and increase the temps in the cyl.

If you give me the stroke and RPM you want to make peak power at, I can tell you what cam you need.

Very true.
Boosted motors do not like long cam events...blowers and such do not like the overlap on "hot" cams, you lose pressure with overlap and cause more heat buildup.