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extractors/exhaust system
Posted: Mon Mar 27, 2006 1:46 pm
by jono
hey guys,
just wondering, i got a qoute for extractors the other day. two different ones. 400 odd for extractors done on the press and 500 od for ones with mandrel bends. also, he said he was going to get a completely new exhaust header/gaskets and build the extractors off that or something.
is it necessary to get that new stuff??
getting a system put in on wedensay, minus the extractors (cant afford them yet
... he thought 2 inch would be good, but i've heard that 1.75"is the biggest u should go. i've got stock F8B with a weber going on in a few weeks......
anyway, any thoughts??
thanks,
jono
Posted: Mon Mar 27, 2006 7:20 pm
by Brayden
You're correct about the size, 1.75" is the largest you should go.
If you want to save $100 on the extractors then get them press bent, chances are that mandrels won't make much difference anyway.
Posted: Mon Mar 26, 2007 12:56 pm
by jono
Hey Brayden, what size do you think I should go in the extractors with this manifold?? Plus there is possibility of a supercharger in the future. 2inch perhaps?
Posted: Mon Mar 26, 2007 1:15 pm
by Brayden
1¼" runners, 2"ish collector into a 1¾" system.
Posted: Mon Mar 26, 2007 1:57 pm
by jono
okay, i will tell the exhaust dudes that. aslready have a 1.75 inch system.. hopefully will make a bit of difference...
thanks mate
Posted: Mon Mar 26, 2007 2:47 pm
by Brayden
Seat of the pants you'll notice a difference in mid to high range performance, but the real power comes with mods to the intake side. (Carby, more air/fuel.)
Posted: Mon Mar 26, 2007 4:36 pm
by jono
Yeah, well I was hoping extractors should help my engine out a bit with this EFI manifold, needs to breathe a bit better.
Posted: Mon Mar 26, 2007 6:39 pm
by me217
sorry to steal the thread but i just got a quick question.
would 2" all the way through no tip on the end. be alright for supercharged f8b. and a standard f5a (as a mate is thinking of a new exhaust.).
me217
Posted: Mon Mar 26, 2007 6:43 pm
by jono
2 inch too big, esp for F5A... i have 1.75 inch, and that should be fine for s supercharged setup
Posted: Mon Mar 26, 2007 6:47 pm
by me217
what damage can be caused by runnin 2". or is there just a lose of power.
me217
Posted: Mon Mar 26, 2007 6:49 pm
by Jermaine
loss of power
Posted: Mon Mar 26, 2007 6:51 pm
by me217
ok thanks.
me217
Posted: Mon Mar 26, 2007 7:37 pm
by Brayden
Back to the original topic:
Jono, I had a mental blank and forgot you have EFI. In that case all you'd probably need is a bigger TB and some tweaks to the fueling.
Posted: Mon Mar 26, 2007 7:53 pm
by jono
LOL, that's okay, though you must have forgotten!
so those sizes for extractors will still be good then?
Posted: Mon Mar 26, 2007 8:14 pm
by Jermaine
hey im interested in extractors...