What's the difference between blower cams and n/a cams?

[01mgvert]

I am having my engine rebuilt. I would like to trade out the cams. For the next year or two, I will probably run n/a and then add a supercharger. What kind of cam should I get?

 

[nickthegenius]

I am having my engine rebuilt. I would like to trade out the cams. For the next year or two, I will probably run n/a and then add a supercharger. What kind of cam should I get?

The Comp Cams XE270AH cams make good N/A power and are well-suited for service as blower cams.

 

[01mgvert]

The Comp Cams XE270AH cams make good N/A power and are well-suited for service as blower cams.

Thanks! Anyone else?

 

[ProCharger GT]

crower has some nice product as well. their stage 2 cam looks pretty nice for either n/a or blower.. i would give them a call for specifics.

 

[Back2Mustangs]

A couple days ago I was talking to the guy, I guess he's the owner of Modular Powerhouse, and he says they custom grind cams for use with the blowers they install. I'd probably call them and tell them what you plan to do and maybe they can make some suggestions. Never hurts to do as much homework as you can to get all the info. I'll probably wind up running N/A before the Blower-Install, just like you for a little while and I am wondering the same thing as you. I'm not ready for all the motor-work and heads to go on yet so I haven't bothered asking anyone about it. I would be very interested in knowing what answers you get to this question though.

 

[millatime]

A couple days ago I was talking to the guy, I guess he's the owner of Modular Powerhouse, and he says they custom grind cams for use with the blowers they install. I'd probably call them and tell them what you plan to do and maybe they can make some suggestions. Never hurts to do as much homework as you can to get all the info. I'll probably wind up running N/A before the Blower-Install, just like you for a little while and I am wondering the same thing as you. I'm not ready for all the motor-work and heads to go on yet so I haven't bothered asking anyone about it. I would be very interested in knowing what answers you get to this question though.

Tim got 25 rwhp out of these "blower" cams on a pretty much stock car...it had lowered compression to the tune of 8.5:1 I believe, so at the stock c.r. the results should be a little higher.

 

[Noble Steed]

Just a general note to answer the original question: Blower cams typically have lower overlap to reduce the amount of raw fuel mixture being pushed out through the open exhaust valve by the pressurized intake charge during the intake stroke. They usually compensate for the resulting lower duration by having higher overall lift and more aggressive profiles. They make measureable improvements in power, drivability, emissions, and fuel economy on blower cars. It's definitely a good thing to do if you have the money in your budget.

 

[WhiteDevil69]

Just a general note to answer the original question: Blower cams typically have lower overlap to reduce the unburnt fuel mixture being pushed out through the open exhaust valve by the pressurized intake charge. They usually compensate for the lower duration by having higher overall lift, and therefore must use more agressive profiles. They make a measureable improvement in power, drivability, emissions, and fuel economy on blower cars.

Exactly, a N/A cam is not going to be a "bad" part to have if you do get the blower down the road, it just will not make as much power as a "blower" cam would.

 

[twogts4us]

Just a general note to answer the original question: Blower cams typically have lower overlap to reduce the amount of raw fuel mixture being pushed out through the open exhaust valve by the pressurized intake charge during the intake stroke. They usually compensate for the resulting lower duration by having higher overall lift and more aggressive profiles. They make measureable improvements in power, drivability, emissions, and fuel economy on blower cars. It's definitely a good thing to do if you have the money in your budget.

Excellent post!
When I saw the original post, I thought to myself, in a word, the answer to this question of the difference between n/a cams and blower cams is 'duration'.

 

[blkhorse]

I'm not sure about ohc engines,but in pushrod engines the main difference between the two is cam overlap.generaly(always exceptions) n/a is 108 to 112 and blown is 112 to 114

 

[onesticker]

What do the blower cams cost?

 

[tangerine]

most cams will run you about 600. if it is custom it will probabl be about the same amount. also you have to add in about another 250 bucks for the tools and the valve springs.