Crower's Summary Of Cam Profiles
11-11-2008, 01:21 PM
#1
Super Moderator
Thread Starter
This is from Crower's regrind flyer.
For those who were wondering what difference you might expect with longer-than-stock camshaft durations. This is NOT Beta-specific, but a general guide for naturally-aspirated bolt-on types who are wondering if they should get some 270s for their driver (hint: probably not).
Anything longer than 264 typically will do MUCH better on our cars if you are running aftermarket engine management.
Here you go, copy/pasted:
1 TOURING PROFILE (250ﾃつｰ)
(Solid Lifter) Improves entire rpm range from 1000 to 6000.
Smooth idle. Stock applications with no more than 10.5:1 compression.
2 RALLY SPORT PROFILE (264ﾃつｰ)
(Solid Lifter) Slight lope at idle. Improves rpm range from 1500 to 6500.
Greatly improves high gear acceleration for passing and hills.
3 SLALOM/AUTOCROSS PROFILE (270ﾃつｰ)
(Solid Lifter) Slight lope at idle, but smooth into the throttle. Improves rpm range from 2000 to 6700 plus.
More power for passing and hills.
4 CLUB RACER PROFILE (284ﾃつｰ)
(Solid Lifter) Racy lope at idle. Extends rpm range from 2500 to 6500 with redline at 7100 plus.
Increased compression, valve pocketing in combustion chamber and added carburetion will enhance total power.
5 COMPETITION PROFILE (290ﾃつｰ)
(Solid Lifter) Race only. Very rough idle, especially with added carburetion.
Higher compression pistons or head milling advised as peak horsepower develops in 5500 to 6500 rpm range.
6 ROAD RACING PROFILE (304ﾃつｰ)
(Solid Lifter) Race only.
Requires extensive modifications like 13:1 compression, grouped exhaust system, individual carburetion, inlet valve pocketing and engine balance. Rpm range from 4500 to 8000.
For those who were wondering what difference you might expect with longer-than-stock camshaft durations. This is NOT Beta-specific, but a general guide for naturally-aspirated bolt-on types who are wondering if they should get some 270s for their driver (hint: probably not).
Anything longer than 264 typically will do MUCH better on our cars if you are running aftermarket engine management.
Here you go, copy/pasted:
1 TOURING PROFILE (250ﾃつｰ)
(Solid Lifter) Improves entire rpm range from 1000 to 6000.
Smooth idle. Stock applications with no more than 10.5:1 compression.
2 RALLY SPORT PROFILE (264ﾃつｰ)
(Solid Lifter) Slight lope at idle. Improves rpm range from 1500 to 6500.
Greatly improves high gear acceleration for passing and hills.
3 SLALOM/AUTOCROSS PROFILE (270ﾃつｰ)
(Solid Lifter) Slight lope at idle, but smooth into the throttle. Improves rpm range from 2000 to 6700 plus.
More power for passing and hills.
4 CLUB RACER PROFILE (284ﾃつｰ)
(Solid Lifter) Racy lope at idle. Extends rpm range from 2500 to 6500 with redline at 7100 plus.
Increased compression, valve pocketing in combustion chamber and added carburetion will enhance total power.
5 COMPETITION PROFILE (290ﾃつｰ)
(Solid Lifter) Race only. Very rough idle, especially with added carburetion.
Higher compression pistons or head milling advised as peak horsepower develops in 5500 to 6500 rpm range.
6 ROAD RACING PROFILE (304ﾃつｰ)
(Solid Lifter) Race only.
Requires extensive modifications like 13:1 compression, grouped exhaust system, individual carburetion, inlet valve pocketing and engine balance. Rpm range from 4500 to 8000.
