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Middy
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PostPosted: Tue Nov 04, 2003 8:19 pm 
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I'm starting to kick myself for even asking this question. :? :x
You've got to be kidding me I love this kind of discussion it's a nice change from some of the usual trafic on the web boards I frequent. Granted a lot of it is going over my head but some of it is getting caught.

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welly225
 Post subject: Busted
PostPosted: Wed Nov 05, 2003 5:42 am 
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Middy you're right, I like the disccussion too. :) Not as fun as wrenching but fun.

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kesteb
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PostPosted: Wed Nov 05, 2003 12:58 pm 
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The pictures that I have seen of manifolds used with forced induction have short stubby runners and generous plenums. You should search some of the Datsun 510/Z car sites. They have several pictures of log manifolds made by "Turbo Tom" that fit the above description. They are supposed to be very good manifolds.
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mpgFanatic
 Post subject: "long ram" tuning?
PostPosted: Wed Nov 05, 2003 5:31 pm 
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In simplest terms: long runners for torque and short runners for top-end horsepower. Long runners reach resonance at low rpm and will therefore boost power at low rpms where torque is dominant. Short runners won't reach resonance until higher rpm;
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The factory H-Pak has 17-18 inches of runner [...add cylinder head and carb...] gives you a total of appx. 25 inches. These manifolds tend to "tune" in the 4500 to 5500 RPM range.
Holy cow, that seems like a high RPM range for a manifold a lot of people consider to be a "long runner" design. How much longer would you have to go to tune for, let's say, 2500 rpm? Maybe each intake tube could resemble the Super Duper Looper roller coaster at Hersheypark? :wink: After all, that's sort of the idea behind the Magnum V8 "barrel" shaped manifold, isn't it?

Here's a dumb question: I assume all of this tuning is as important in a port injection system as with a carburetor, the exception being we don't need to worry about keeping fuel droplets in suspension in the mixture?

- Erik

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Doctor Dodge
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PostPosted: Wed Nov 05, 2003 6:49 pm 
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Holy cow, that seems like a high RPM range for a manifold a lot of people consider to be a "long runner" design. How much longer would you have to go to tune for, let's say, 2500 rpm?
The 4500-5500 "tuned" power band of a factory Hyper-Pak was based on a 170 engine with a pretty good cam. (276 / .440 lift)
I would think that a longer stroke 225 with a milder cam could be made to "tune" at lower RPMs.

The trouble is that the smaller displacement tends to need some RPM to make horsepower, you need to burn some fuel and the cubes alone at 2500 RPM does not give you a lot to burn.
DD
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Slanted73
PostPosted: Wed Nov 05, 2003 7:52 pm 
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Did you send it to my hotmail account? i haven't seen it there yet if you did. I didn't need anything fancy anyways. I'm just curious naturally. it's been a good discussion.

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welly225
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PostPosted: Thu Nov 06, 2003 6:25 am 
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The email address I used is this one from your other post. polara1964@hotmail.com

Maybe I goofed :oops: Is this the right address? Let me know and I'll send it again.

Welly

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welly225
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PostPosted: Thu Nov 06, 2003 9:11 am 
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http://snow.prohosting.com/~johngift/intakefab.html

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Slanted73
 Post subject: email right - cool site
PostPosted: Thu Nov 06, 2003 3:35 pm 
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Yup - that's the right email. That site is pretty cool. i love that home crafted stuff.

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