Cam change with SC???
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Cam change with SC???
Should I even invest in a different cam if I plan on running about 8lbs of boost? Streetability being a prime concern (and smog test). Thinking about the Carroll kit.....
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
Re: Cam change with SC??? (GRX)
Should I even invest in a different cam if I plan on running about 8lbs of boost? Streetability being a prime concern (and smog test). Thinking about the Carroll kit.....
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
Re: Cam change with SC??? (GRX)
Smog is not an issue. For testing I'll 'bypass' the blower....
I know shalin used a ZZ9 cam on his LT1, it ran a 10.8 I think. I know it was a high 10's car. It was auto too.
LPE also sells a blower cam.
I dont have any idea what cam to run, I am looking too.
Melting Slicks
Joined: May 2000
Posts: 2,148
Likes: 1
From: Chandler AZ
Re: Cam change with SC??? (GRX)
The good news is blower motors don't need high overlap or outrageous lift / duration; both enemies of streetability and emissions. That being said, blower cams have very similar characteristics to stock:
Low overlap: with a blower you want 114-116 LSA so the pressurized intake doesn't blow right thru to the exhaust.
Intake: Don't go crazy on duration/lift; this keeps it streetable with decent emissions. And at higher rpm the blower will kick in and force feed it anyway.
Exhaust: This is where the blower motor needs the most help- getting everything out; think 12-20 degrees longer and .020-.040 higher lift than the intake. (And 1.625" exhaust valves don't hurt either.)
With low boost on a stock 350, your existing cam isn't bad. If your looking for more (especially with higher flowing intake and headers, etc), I'd try one of CompCams hyd-roller blower cams, 212/224. They also have 218/230, 224/236 profiles (good for larger displacement); but understand these will sacrifice some low end and produce more emissions on your 350.
FWIW, I run 215/234 @114LSA with .480/.510 lift on my 383 blower motor; see info in sig...
[Modified by gcrouse, 2:13 AM 6/11/2002]
Low overlap: with a blower you want 114-116 LSA so the pressurized intake doesn't blow right thru to the exhaust.
Intake: Don't go crazy on duration/lift; this keeps it streetable with decent emissions. And at higher rpm the blower will kick in and force feed it anyway.
Exhaust: This is where the blower motor needs the most help- getting everything out; think 12-20 degrees longer and .020-.040 higher lift than the intake. (And 1.625" exhaust valves don't hurt either.)
With low boost on a stock 350, your existing cam isn't bad. If your looking for more (especially with higher flowing intake and headers, etc), I'd try one of CompCams hyd-roller blower cams, 212/224. They also have 218/230, 224/236 profiles (good for larger displacement); but understand these will sacrifice some low end and produce more emissions on your 350.
FWIW, I run 215/234 @114LSA with .480/.510 lift on my 383 blower motor; see info in sig...
[Modified by gcrouse, 2:13 AM 6/11/2002]
Thread Starter
Le Mans Master
Joined: Jul 2001
Posts: 6,252
Likes: 2
From: Silicon Valley Kalifornia
Re: Cam change with SC??? (gcrouse)
... .200-.400 higher lift than the intake...
What kind of times are you getting with your setup?
[Modified by GRX, 4:31 PM 6/10/2002]
Melting Slicks
Joined: May 2000
Posts: 2,148
Likes: 1
From: Chandler AZ
Re: Cam change with SC??? (GRX)
Did you mean to say : .020-.040 higher lift?
What kind of times are you getting with your setup?
[Modified by gcrouse, 2:22 AM 6/11/2002]
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Safety Car
Joined: Apr 2001
Posts: 3,525
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From: Houston TX
Re: Cam change with SC??? (gcrouse)
On my previous 350, I ran a TPIS HR (114LSA, 224/224 @ 0.050 with 0.566/0.566 I/E). The full street weight '87 roadster never got into the 10's, but ran very high 120s in the quarter. Basically the combo was a stock short block, 8 psi (smallest pulley made delivered 1300 cfm @ 5800 RPM), heavily worked Superram, 58MM, long tubes, massive heads (had used AFR190RRs prior), ZF6, 3.45D44, running slicks. My big problem was with traction (60 ft5 was consistantly above 2.30 sec and went as high as 3.30 sec on slicks).
With more cubes, D-1 equiped 408 uses a CC SR (114LSA, 242/244 @ 0.050 with 0.628/0.644 I/E). With a MRII, AFR215CP (2.08" I / 1.625" E valve) the new unit should run to 6700 RPM, if I ever get a decent engine management system.
GCrouse has the right idea as far as specs are concerned in SC vs NA applications.
Aaron
With more cubes, D-1 equiped 408 uses a CC SR (114LSA, 242/244 @ 0.050 with 0.628/0.644 I/E). With a MRII, AFR215CP (2.08" I / 1.625" E valve) the new unit should run to 6700 RPM, if I ever get a decent engine management system.
GCrouse has the right idea as far as specs are concerned in SC vs NA applications.
Aaron
Melting Slicks
Joined: Mar 1999
Posts: 2,535
Likes: 2
From: Rochester NY
Re: Cam change with SC??? (GRX)
I run custom ground CC Extreme Energy 222/230 @.05 .560/.600 114 LSA w/ my 1.6rr on my 383ciLT1.
Bruce
93LT1 Conv w/ZF6
Blown D1-SC/N2O
Agostino Built 383ci
[Modified by Bruce, 6:50 PM 6/22/2002]
Bruce
93LT1 Conv w/ZF6
Blown D1-SC/N2O
Agostino Built 383ci
[Modified by Bruce, 6:50 PM 6/22/2002]