Reverse split cam with a supercharger ?
Reverse split cam with a supercharger ? I've used this cam on a couple turbo builds and I was wondering if I could use it with a supercharger.
It's already installed in my shortblock and I dont really want to buy another cam.
I know most people don't like reverse split cams but Id like some opinions on this cam with a blower.
It's already installed in my shortblock and I dont really want to buy another cam.
I know most people don't like reverse split cams but Id like some opinions on this cam with a blower.
Here's the thing with forced induction, and I'm not a cam expert, but the key to making power is getting as much air into and out of the cylinder. The blower/turbo helps get it in, but there is nothing but the piston to push it out, so you need as much help as possible getting spent gasses out of the chamber.
Chances are, you're going to see less horsepower, but more boost pressure with that cam. Say you are making 15psi, you might only see 575rwhp. Put in a blower friendly cam, and your boost pressure might drop to 11-12psi, but power would increase to 650 (just random numbers here).
I'd rather make more hp with less boost, than the opposite. If I could make 1000rwhp on 10psi, I'd chose that all day long vs. 1000hp at 30psi of boost.
So in the end, a cam events are even more critical in a forced induction setup, especially considering the flow characteristics of the cylinder heads.
Chances are, you're going to see less horsepower, but more boost pressure with that cam. Say you are making 15psi, you might only see 575rwhp. Put in a blower friendly cam, and your boost pressure might drop to 11-12psi, but power would increase to 650 (just random numbers here).
I'd rather make more hp with less boost, than the opposite. If I could make 1000rwhp on 10psi, I'd chose that all day long vs. 1000hp at 30psi of boost.
So in the end, a cam events are even more critical in a forced induction setup, especially considering the flow characteristics of the cylinder heads.
Here's the thing with forced induction, and I'm not a cam expert, but the key to making power is getting as much air into and out of the cylinder. The blower/turbo helps get it in, but there is nothing but the piston to push it out, so you need as much help as possible getting spent gasses out of the chamber.
Chances are, you're going to see less horsepower, but more boost pressure with that cam. Say you are making 15psi, you might only see 575rwhp. Put in a blower friendly cam, and your boost pressure might drop to 11-12psi, but power would increase to 650 (just random numbers here).
I'd rather make more hp with less boost, than the opposite. If I could make 1000rwhp on 10psi, I'd chose that all day long vs. 1000hp at 30psi of boost.
So in the end, a cam events are even more critical in a forced induction setup, especially considering the flow characteristics of the cylinder heads.
Chances are, you're going to see less horsepower, but more boost pressure with that cam. Say you are making 15psi, you might only see 575rwhp. Put in a blower friendly cam, and your boost pressure might drop to 11-12psi, but power would increase to 650 (just random numbers here).
I'd rather make more hp with less boost, than the opposite. If I could make 1000rwhp on 10psi, I'd chose that all day long vs. 1000hp at 30psi of boost.
So in the end, a cam events are even more critical in a forced induction setup, especially considering the flow characteristics of the cylinder heads.
If your going through the trouble of installing FI you may as well not leave all that on the table. Relatively speaking a Cam swap isn't too intrusive when you consider all the other supporting mods that we go through.
My. $0.02
Teching In
Joined: Oct 2007
Posts: 21
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Generally speaking the idea behind a turbo cam is to prevent exhaust gas from re-entering the cylinder since it is under significant pressure due to the turbo. As such the exhaust tends to close earlier with turbo cams.
With a blower you have a far more open flowing exhaust with significantly less back pressure so the blower cams leave the exhaust open longer and take advantage of the fact that the intake air in pressurized to help push exhaust out. So there is more overlap than a turbo cam.
Will your cam work? Yes. The engine will run and make more power than without a blower. Will your engine make more power with a blower cam? Probably significantly more.
Beyond these general rules I'm not qualified to speak. Maybe the cam gurus will come add detail.
With a blower you have a far more open flowing exhaust with significantly less back pressure so the blower cams leave the exhaust open longer and take advantage of the fact that the intake air in pressurized to help push exhaust out. So there is more overlap than a turbo cam.
Will your cam work? Yes. The engine will run and make more power than without a blower. Will your engine make more power with a blower cam? Probably significantly more.
Beyond these general rules I'm not qualified to speak. Maybe the cam gurus will come add detail.
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You need a 6~12 deg forward split IMO. I have had guys use my single pattern turbo cams with blowers and they have worked ok but a little extra exh duration works better. I would not run a reverse for that application.
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PM's disabled, please e-mail me
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