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Title: Has an oversized header noticeable effect on HP? Post by: Jordy/DVK 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 Title: Re: Has an oversized header noticeable effect on HP? Post by: Bewitched666 on October 21, 2007, 12:27:42 pm It will depends what engine you are running.
It will hold back some ;D Title: Re: Has an oversized header noticeable effect on HP? Post by: Jordy/DVK 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? Title: Re: Has an oversized header noticeable effect on HP? Post by: Jordy/DVK on October 22, 2007, 20:15:22 pm (http://www.keversite.nl/fotoalbum/fotos/52471.jpg) Title: Re: Has an oversized header noticeable effect on HP? Post by: John Rayburn 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.
Title: Re: Has an oversized header noticeable effect on HP? Post by: Shubee2 (DSK) 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
Title: Re: Has an oversized header noticeable effect on HP? Post by: Bewitched666 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 ;D Title: Re: Has an oversized header noticeable effect on HP? Post by: Peter on October 24, 2007, 19:35:35 pm isnt that a 2 inch header?
Title: Re: Has an oversized header noticeable effect on HP? Post by: Jordy/DVK on October 25, 2007, 00:40:55 am 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... ) Title: Re: Has an oversized header noticeable effect on HP? Post by: Tobi/DFL 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 ;))? If you want to you could buy my 1 5/8" header (with O² bung) if I should buy a larger header... Bye, Tobi Title: Re: Has an oversized header noticeable effect on HP? Post by: Bewitched666 on October 25, 2007, 17:30:15 pm Trumpet/vase=other word for Stinger???
Title: Re: Has an oversized header noticeable effect on HP? Post by: Jordy/DVK 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. 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! ;) Cheers! Jordy ;) @Bewitched: yeah.. with vase/trumpet I referred to the stinger... Title: Re: Has an oversized header noticeable effect on HP? Post by: JS on October 27, 2007, 18:12:44 pm "Chinese kwaliteit ". I´m a bit sceptic! :D
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