intake manifolds

[eramirez198121]

I would like to know why some manifold are high and other are low. Which style are better and which one give more horsepower?

[beastie_3]

Low manifolds are for stock and mild modified engines, and I think they are focused on more torque. High rise are focused for high RPM built up motors.

[eramirez198121]

Thanks, I appreciate the help. Now in that note when I am trying to built a high performing engine what should I concentrate on more is it torque or horsepower. The type of engine I am trying to built is for the track but I am not trying to get in to the NHRA just as a hobby. The other question I have is when people go 0.030 over in bore size does this really add more horsepower or torque?

[eventhorizon66]

I strongly recommend you read these two books:

http://www.amazon.com/David-Vizards-Build-Horsepower-Design/dp/1934709174/ref=sr_1_2?ie=UTF8&s=books&qid=1279388334&sr=8-2

http://www.amazon.com/Build-Chevy-Small-Blocks-Budget-Performance/dp/1932494847/ref=sr_1_1?ie=UTF8&s=books&qid=1279388370&sr=8-1

They are full of very useful information, especially for someone new to the engine building hobby.

Of course you didn't say if you're interested in small blocks or big blocks.  If you are interested in going fast, you are interested in as many cubic inches as you can afford.

The reason people overbore an engine is to reestablish a nice new bore surface.  The increase in power from a few more cubic inches is minimal.

You are always shooting for high torque.  The rpm you choose to make this torque and the shape of the torque "curve" will determine the horsepower.  Horsepower is mathematically derived from torque; they are not exclusive of one another.

(Torque X RPM) / 5252 = Horsepower

[eramirez198121]

Thanks for the information on that. I am a big small block fan myself and I do agree with you size does matter but for now I want to see how much power I can produce with a small block chevy.

[beastie_3]

Spend a few hours at a book store and go through some of the neat books they have on engines, modifications, performance etc. grab a cup of coffee/late whatever and go through the books to see which ones you might be interested in buying. Plus, hot chicks can be found at a book store.

[eramirez198121]

Yea that what i am going to check out. Thanks

[VileZambonie]

Some intake manifolds also need to be low rise for hood clearance. Do a search on here for dual plane and single plane intake manifolds also and you will find useful information.

[VileZambonie]

Check out the pic I posted in this thread too

http://forum.73-87chevytrucks.com/smforum/index.php?topic=2991.0

[frotosride]

The high rise intakes are usually single plain intakes and the low ones are dual planes. The single planes are the best for making horespower in the long run but their downfall is that it moves your torque and hp curve a lot higher up the rpm range. If you plan to make a dragster the this may be your best option. However, if you are looking for good low-end power like say for a 4x4 or just for hauling or economy and power then the dual plain is the best. Highly recommend edelbrock performer rpm intake. They will allow the best usable hp and torque... Keep in mind that hp is a by-product of torque so if you are putting it in a truck look for a good torque curve in a low rpm range.. unless you plan on racing the truck..then there are a lot more factors to calculate with a single plain intake.