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Using vacuum leak for performance 

 

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 Post subject: Re: Using vacuum leak for performance
Posted: Fri Dec 19, 2014 12:52 pm 
Getting Side Ways
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Ride: EF XR6 Wagon, AU2 XR6 VCT

Power: 148 rwkw

Location: Auckland
New Zealand

I'm sure some of the principles used on EFI throttle bodies can be used on carbs as well:
- cut away one side of the throttle shaft (the side with the head of the screws, not the threads)
- shave about 30-40% of the remaining side of the shaft and round it off a bit
- knife-edge the throttle butterflies (especially the leading edge); leave the edge that contacts the carb bore where it is, but file down the other side to create a knife-edge - flat on one side, angled on the other.
- if you are looking for every poofteenth of gain, shorten the screws that now protrude into the airflow.

A throttle body can gain about 8% airflow this way; a carb should be similar.

 

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95 EF XR6 wagon, 17" FTRs, DBA rotors, KYB/Koni, AU bottom end, ported EF head, backcut valves, SS Inductions, Territory intake, 10.2 CR, Auckland 1258 cam, vernier gear, PH4480 headers, no cat, Tickford 2.5", 2800rpm stall, J3 chip

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 Post subject: Re: Using vacuum leak for performance
Posted: Sun Dec 21, 2014 6:20 pm 
Fordmods Newbie
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Joined: 15th Dec 2014

Location: sydney
NSW, Australia

more posibilities:

the vacumn brake booster doesn't work, and you might get check engine light on because long term fuel trim exceeds max value
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 Post subject: Re: Using vacuum leak for performance
Posted: Sun Dec 21, 2014 6:54 pm 
Technical Contributor
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Location: Campbelltown
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fbaxt05 wrote:
more posibilities:

the vacumn brake booster doesn't work, and you might get check engine light on because long term fuel trim exceeds max value


What engine light?

It's an EA witha 350 Holley fitted..............
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