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Author Topic: Has an oversized header noticeable effect on HP?  (Read 4915 times)
Jordy/DVK
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« on: October 20, 2007, 20:19:18 pm »

 Hi Guys,

 I'm just wondering wether an oversized header has very much effect on the HP of your engine?
 Does a too large header really slow down the exhaust gas speed that much? How much does this affect the HP output?
 Any ideas?

 Cheers, Jordy

 
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Bewitched666
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« Reply #1 on: October 21, 2007, 12:27:42 pm »
It will depends what engine you are running.
It will hold back some Grin
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Jordy/DVK
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« Reply #2 on: October 22, 2007, 19:59:37 pm »

 Okay... is a 1-3/4 SS header with 2" collector too much for let's say a 1915cc, with 043 heads 42x37,5, engle FK-8 engine?
 Is that JayCee SS header any good?
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Jordy/DVK
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« Reply #3 on: October 22, 2007, 20:15:22 pm »

 
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John Rayburn
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« Reply #4 on: October 23, 2007, 00:21:12 am »
1 5/8 would suit that combo a little better. 1 3/4 might cost you a little bottom end.
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Shubee2 (DSK)
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« Reply #5 on: October 23, 2007, 00:30:40 am »
if you go to big  you loose bottom end power, with a smaller pipe you get more bottom end Power, Smaller Motors run better with a little Back Pressure On a Big Motor with Big Heads It Needs the Bigger Exhaust
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Bewitched666
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« Reply #6 on: October 23, 2007, 21:19:44 pm »
Ah the one from ZZPACKED Jordy.

I would go with a 1 5/8 inch header for the 1915cc,my 2 cents Grin
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Peter
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« Reply #7 on: October 24, 2007, 19:35:35 pm »
isnt that a 2 inch header?
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Jordy/DVK
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« Reply #8 on: October 25, 2007, 00:40:55 am »
Quote from: ruff on October 24, 2007, 19:35:35 pm
isnt that a 2 inch header?

 The pipes are 44mm (1-3/4) where they connect to the heads and I believe that at the collector it is 49mm or something like that.
 (see the webshop of http://www.KaagKevers.nl)

 € 125,- for an SS header like this is a bargain... (with a free stainless steel trumpet/vase... )
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Tobi/DFL
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« Reply #9 on: October 25, 2007, 08:56:06 am »
Hi Jordy,
I wouldn´t try a 1 3/4" header for your 1914cc as well. My 2176cc engine runs quite well with its tiny 1 5/8" Bugpack header (modified to a large flange) and modified (large flange) CB dual quiets. Anyway I guess I´m loosing some top end power with it so I will probably change it to a 1 3/4" header with larger, homemade dual quiets very soon.
Is the price you mentioned before for a new header? If so, where can I find it on their website (my dutch isn´t that good Wink)?
If you want to you could buy my 1 5/8" header (with O² bung) if I should buy a larger header...
Bye,
Tobi
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Bewitched666
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« Reply #10 on: October 25, 2007, 17:30:15 pm »
Trumpet/vase=other word for Stinger???
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Jordy/DVK
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« Reply #11 on: October 27, 2007, 16:36:03 pm »
 Hey Tobi,

 Here's you can find the header ( stinger included): http://www.kaagkevers.nl/shop.php?id=10068#K%20181
 Here another header (2nd hand but unused) for sale: http://www.keversite.nl/prikbord/adv.php?id=10763

 I don't know much about the finishing/fitting quality of the header. 

Quote from: Tobi/DFL on October 25, 2007, 08:56:06 am
If you want to you could buy my 1 5/8" header (with O² bung) if I should buy a larger header...

  If you're going to buy a bigger header & DQP please let me know, I might indeed be interested! Wink

 Cheers! Jordy Wink


 @Bewitched: yeah.. with vase/trumpet I referred to the stinger...
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JS
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« Reply #12 on: October 27, 2007, 18:12:44 pm »
"Chinese kwaliteit ". I´m a bit sceptic!  Cheesy
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