Craigorypeck
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| posted on 18/12/12 at 10:52 PM |
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injector position
wheres best position to mount injector bosses on a custom manifold? will it make much difference if they are real close or say 2" from head?
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HowardB
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| posted on 18/12/12 at 11:20 PM |
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there is a lot written about this,..
on to the back of the valve - helps cold start - common on tin tops
further out (2" or so) gives the fuel a chance to mix
even further out (often a second row) better still at very high rpm - common on high performance bike engines
so it is worth having a look and seeing what others have done with the same TB/engine combo
hth
[Edited on 18/12/12 by HowardB]
Howard
Fisher Fury was 2000 Zetec - now a 1600 (it Lives again and goes zoom)
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Craigorypeck
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| posted on 18/12/12 at 11:55 PM |
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thanks! thinking of converting to efi from bike carbs and have tapped holes in my custom mani for vacuum ref so considering weld on bosses in their
position and a diy fuel rail.
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Craigorypeck
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| posted on 19/12/12 at 12:13 AM |
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regarding fuel rail- can you get a weld in boss that clamps the injector in place and then can be plumbed with flexible hose from regulator and not
need a rail?
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mark chandler
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| posted on 19/12/12 at 12:57 AM |
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Why not use the injectors in the TB's, there is nothing magic about car engined injectors.
Any big bikes will flow up to 200bhp these days.
The bike will have a MAP take off on the TB's as well
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matt_gsxr
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| posted on 19/12/12 at 09:39 AM |
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quote:
Originally posted by mark chandler
Why not use the injectors in the TB's, there is nothing magic about car engined injectors.
I guess because he is using bike carbs, so no injectors.
You might be better off selling the bike carbs and getting TB's though and doing as Mark suggests. Its a popular and well proven route.
gsxr1000 k1-3 throttle bodies are the best to use for several reasons and you can reuse the injectors, and such.
That is what I did although I was fuel injecting a bike engined car.
http://www.matt_phoenix.talktalk.net/GSXR1100_fuel_injection_hardware.html
Matt
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Craigorypeck
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| posted on 19/12/12 at 11:18 PM |
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my runners are well long and the injectors would be near 7" from the head if i replaced the carbs with throttle bodies. hence my first post. can
get welding done for nout by a mate so may go for weld on bosses,
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mark chandler
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| posted on 20/12/12 at 08:37 AM |
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My runners are long with a 30 degree bend in them, idle is spot on and makes good power, same applied before I stuck a turbo on.
OEM squirt at the back of the valves for idle emissions, 7" is not a problem.
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coyoteboy
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| posted on 20/12/12 at 01:30 PM |
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The difference in location will only have minimal effect until you get to 4+ inches IMO, you're best sticking with the sorts of distances the
bulk of tin-tops use unless you're planning to run high RPM a lot, then maybe move it out but accept you may get reduced idle quality.
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