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Old 10-12-2003, 10:31 PM   #1
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Default manifold rule of thumb

confused on this, what's the performance if you use longer manifold vs shorter manifold?
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Old 10-12-2003, 10:42 PM   #2
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If you increase the length in between the manifold and pipe, the engine will get better low rpm power(more torque) but you will loose high rpm power(less rpm at full speed).

If you decrease the length in between the manifold and pipe, the engine will get better high rpm power(more rpm at full speed) but you will loose low rpm power(less torque).

Hence ... size does matter!!!
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Old 10-12-2003, 10:51 PM   #3
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Quote:
Originally posted by tIANcI
If you increase the length in between the manifold and pipe, the engine will get better low rpm power(more torque) but you will loose high rpm power(less rpm at full speed).

If you decrease the length in between the manifold and pipe, the engine will get better high rpm power(more rpm at full speed) but you will loose low rpm power(less torque).

Hence ... size does matter!!!
interesting. thanks for the reply bro.
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Old 10-12-2003, 11:07 PM   #4
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-edited- yep i'm wrong, cuz my memory is vague after coming back from a japanese buffet (with a good heineken, some plum wine, and a good amount of sake ).

<<hope i'm typing this correctly.>>

manifold length and space between the manifold and the pipe are two different things. pretty sure the info before me is correct so kudos to you :-).

Last edited by icon; 10-12-2003 at 11:37 PM.
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Old 10-12-2003, 11:32 PM   #5
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Icon, I believe you have that backwards,,

short manifolds = higher rpms
long manifolds = more torgue

You can increase your top speed by shortening your manifold. You do this by cutting a small section off the end of the manifold. Don't cut more than 1/8 inch at a time and check for any performance gain after each cut. Use a stopwatch to see how long it takes your car to go at least 100 feet at wide open throttle (make sure your engine temp isn't too high). If you see a increase in speed then you can cut another 1/8 inch off the manifold and test again. Continue cutting the manifold until there is no increase in speed.
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Old 10-12-2003, 11:36 PM   #6
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ah, thank you .
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Old 10-12-2003, 11:51 PM   #7
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Of course, in-line exhaust systems would be a right bitch to perform these mods on, lol.
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Old 10-12-2003, 11:56 PM   #8
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LMAO. hehe, thats what my last car used so my manifold knowledge is sketchy.
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Old 10-13-2003, 12:08 AM   #9
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i know this is not the ntc3 thread but just to share the pipe i'm using is dynamite inline pipe with a long manilfold design, my engine is novarossi s5 and this is bolted in my ntc3. i'm not sure if
the manifold length has a great effect on its torque or i have to change my pinion gears combo.
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Old 10-13-2003, 01:06 AM   #10
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Quote:
Originally posted by Old Skool
Of course, in-line exhaust systems would be a right bitch to perform these mods on, lol.
I was going to say that but just got tired of typing such a long post
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Old 10-16-2003, 10:36 AM   #11
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i love short manifolds because of the amount of top end rev. The low end doens't hurt that much if you run a centax, just tighten it down. (engage later)
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Old 10-16-2003, 11:10 AM   #12
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Quote:
Originally posted by mtx3racer
i love short manifolds because of the amount of top end rev. The low end doens't hurt that much if you run a centax, just tighten it down. (engage later)
Shhhhhhhh!!!!!!! You're giving away one of the best kept secrets...
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Old 10-16-2003, 11:36 AM   #13
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Quote:
Originally posted by Old Skool
Of course, in-line exhaust systems would be a right bitch to perform these mods on, lol.
Nothing more hassling that asking in your machine shop to do do some aluminium collars for sliding between the pipe and the manifold. More clean, more crash resistant and more 'repeatable'.
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Old 10-16-2003, 12:47 PM   #14
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Your right, i'll hush down
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