Cam Change!
Thread Starter
Racer
Joined: Oct 2010
Posts: 474
Likes: 0
From: Bishop CA
Cam Change!
I decided to put a bigger cam into my 75 L48. Just did a complete rebuild on it and I let the builder talk me into a Crower 241 cam Has a lift of 456. I also put on Brodix IK 180 alum. heads, performer intake, 650cfm edelbrock (Weber), shorty headers. Iv'e got a dyno at about 350 at the flywheel. With all this good stuff I want some better sound out of the cam and more HP at the same time. The cam thats in it now has zero lope to it. Contacted Comp cams and they suggested part # 12-246-3. Has a lift of 490. Well what do you guys think, will this make this motor sound alot better. I want a noticeable lope but don't want vacuum problems or idle problems. The Brodix heads will handle a cam up to a 525 lift. Any input? Thanks Guys.
Thread Starter
Racer
Joined: Oct 2010
Posts: 474
Likes: 0
From: Bishop CA
C'mon Guys, Help Me!
I decided to put a bigger cam into my 75 L48. Just did a complete rebuild on it and I let the builder talk me into a Crower 241 cam Has a lift of 456. I also put on Brodix IK 180 alum. heads, performer intake, 650cfm edelbrock (Weber), shorty headers. Iv'e got a dyno at about 350 at the flywheel. With all this good stuff I want some better sound out of the cam and more HP at the same time. The cam thats in it now has zero lope to it. Contacted Comp cams and they suggested part # 12-246-3. Has a lift of 490. Well what do you guys think, will this make this motor sound alot better. I want a noticeable lope but don't want vacuum problems or idle problems. The Brodix heads will handle a cam up to a 525 lift. Any input? Thanks Guys.
Drifting
Joined: Dec 2002
Posts: 1,946
Likes: 28
From: Long Beach CA
What do you use the car for? Any racing? Just cruising around town? To get that lope you're looking for takes more duration as well as more lift. And that moves your power band up the rpm scale. You can end up with very little power below 3,000 rpm or so. Which would be no fun around town, if you have to wind the engine to 6,000 rpm to enjoy the power.
It is also possible to over-cam an engine. What is your compression ratio? If you're running 9 or 9.5 to 1, a radical cam is going to make it run worse, not better.
It is also possible to over-cam an engine. What is your compression ratio? If you're running 9 or 9.5 to 1, a radical cam is going to make it run worse, not better.
Thread Starter
Racer
Joined: Oct 2010
Posts: 474
Likes: 0
From: Bishop CA
What do you use the car for? Any racing? Just cruising around town? To get that lope you're looking for takes more duration as well as more lift. And that moves your power band up the rpm scale. You can end up with very little power below 3,000 rpm or so. Which would be no fun around town, if you have to wind the engine to 6,000 rpm to enjoy the power.
It is also possible to over-cam an engine. What is your compression ratio? If you're running 9 or 9.5 to 1, a radical cam is going to make it run worse, not better.
It is also possible to over-cam an engine. What is your compression ratio? If you're running 9 or 9.5 to 1, a radical cam is going to make it run worse, not better.
Drifting
Joined: Jun 2010
Posts: 1,781
Likes: 15
From: Oxford Ohio
Find or have ground a mild solid roller cam. It will sound great and be very streetable. They are difficult to find is why I suggested having one ground with a mild profile.
If you are running an auto tranny and get to wild you'll run into stall speed converter issues.
If you are running an auto tranny and get to wild you'll run into stall speed converter issues.
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
Cam lift has almost nothing to do with how radical it is.
What creates an idle with a lope is duration and overlap.
Look for a cam without too much duration, but with a tight lobe separation angle, and you can get a nice lope without suffering too many "big cam" issues.
What creates an idle with a lope is duration and overlap.
Look for a cam without too much duration, but with a tight lobe separation angle, and you can get a nice lope without suffering too many "big cam" issues.
Le Mans Master
Joined: Oct 2010
Posts: 6,936
Likes: 848
From: melbourne florida
2023 C3 of the Year Finalist - Modified
another thing to consider is a bigger carburetor with those heads and a cam it has to be leaving power on the table. on a stock motor fine but not your motor
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Drifting
Joined: May 2005
Posts: 1,258
Likes: 38
From: springtown Texas
.490 lift is not radical. if you want a good sound with some lope, go for a cam with @ .500-.525 lift and @220-228 dur @.050 and a 108-110 sep. this is with a stock or 1500-1800 stall convertor.
good luck
good luck
Le Mans Master
Joined: Apr 2005
Posts: 6,355
Likes: 425
From: Seattle Area WA
The cam comp recommended XE274 would be a good match for your build 230/236 degrees and give you the sound you are after since its ground on a 110 LSA. Another good cam that will be good with your build would be the Comp 270 Magnum it doesn't have the extreme ramp rate on the lobes like the XE series and would be a little easier on the valve train wear. [IIt would have more low end torque than the XE274[/I]Duration @ .050'' Lift: 224° Intake / 224° Exhaust
Valve Lift w/1.5 Rockers: .470'' Intake / .470'' Exhaust
Lobe Separation Angle: 110°
The Crower specs are 214°/218° @0.050" which is pretty tame for an engine with 10:1 compression. The L82 cam is 224/224 to give you an example how small the Crower is.
Valve Lift w/1.5 Rockers: .470'' Intake / .470'' Exhaust
Lobe Separation Angle: 110°
The Crower specs are 214°/218° @0.050" which is pretty tame for an engine with 10:1 compression. The L82 cam is 224/224 to give you an example how small the Crower is.
