Barksavon
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| posted on 4/7/17 at 10:48 AM |
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Individual Throttle Bodies and Bike Carburetors
Am I right in thinking ITB's are basically butterfly valves that feed air into each cylinder individually rather than them all being fed from a
single plenum and that a set of bike carbs mounted on a suitable intake manifold does the same but with fuel added to the mix? My reason for asking is
cos I hope to swap to a ST170 engine and I have some bike carbs I want to use, do I disable the injectors, I will be using an ecu , hopefully my
megajolt with TPS...thanks
Ian
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Jenko
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| posted on 4/7/17 at 12:02 PM |
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ITB's (individual throttle bodies) are used with fuel injection, they will have injectors, throttle position sensor.
Bike carbs will of course do the job, but in general going fuel injection is a much better all round.
For the St170 engine, it has a variable valve control which will require an ECU ( separate controller), megajolt will not do this. The engine is
designed with injection in mind.
Honestly, I would either go with ITB's or stick with the standard injection system...almost everything you need is already on the engine (VR
Sensor, coolant sensor, TPS, air temp sensor). Only additional item needed is a high pressure fuel pump and return line.
MY BLOG - http://westfieldv8.blogspot.co.uk/
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Barksavon
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| posted on 5/7/17 at 07:22 AM |
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Thanks for the reply. I might have to go with my bike carbs initially, if I do what do i do about the original injectors as the fuel will go in via
the carbs? I have had great advice from others on the forum and I'm looking at running with bike carbs a vvt controller and megajolt. I've
also read on another forum that retarding the exhaust cam by 8 deg can give decent power gain.... thanks again all for the great advice it is very
much appreciated
Ian
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Jenko
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| posted on 5/7/17 at 10:33 AM |
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Im probably missing something....is your car currently running on fuel injection?....If it is, then you will be using an ECU to control them and your
ignition, why change?
Again, probably not understanding the full picture I may be giving duff advice.....But, I would also question the extra power quote from another
forum....It is possible different cam timing will give extra power, but you will of course sacrifice the low end running and power. Hence the control
of the VVT which will alter the cam timing based on rpm and throttle load.
To answer the OP direct...you can simply disconnect the injectors and they won't do anything, but you will also not be able to use the same fuel
pump for carbs (there will be way too much pressure).
I think we need to understand your current set up and what you want to do with the vvt engine.
MY BLOG - http://westfieldv8.blogspot.co.uk/
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40inches
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| posted on 5/7/17 at 01:20 PM |
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quote:
Originally posted by Jenko
Im probably missing something....is your car currently running on fuel injection?....If it is, then you will be using an ECU to control them and your
ignition, why change?
Again, probably not understanding the full picture I may be giving duff advice.....But, I would also question the extra power quote from another
forum....It is possible different cam timing will give extra power, but you will of course sacrifice the low end running and power. Hence the control
of the VVT which will alter the cam timing based on rpm and throttle load.
To answer the OP direct...you can simply disconnect the injectors and they won't do anything, but you will also not be able to use the same fuel
pump for carbs (there will be way too much pressure).
I think we need to understand your current set up and what you want to do with the vvt engine.
My thoughts exactly. Carbs to injection.... OK. Injection to carbs....Why?
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Barksavon
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| posted on 5/7/17 at 08:29 PM |
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Sorry if I'm confusing you guys, what I'm doing is fitting a ST170 engine into my car after my pinto went bang. I've bought a ST170
and have a set of bike carbs and a megajolt which I'm told I could use on the ST together with a vvt controller.
Fuel injection is a new area for me so bear with me if some of my questions seem a bit dumb😀
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davidimurray
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| posted on 6/7/17 at 07:41 AM |
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Yes no problem running carbs. I am running ZX6R carbs on my Duratec. Simply made some little plugs and blanked off the injector holes. You could leave
the injectors in with the fuel rail just clamping them there - you can see my installation here
https://www.locostbuilders.co.uk/viewthread.php?tid=192871
Gallery 1 http://www.facebook.com/media/set/?set=a.116893465324.130778.601005324
Gallery 2 http://www.facebook.com/media/set/?set=a.245243755324.181913.601005324&l=a9831a9319
Gallery 3 http://www.facebook.com/media/set/?set=a.440671625324.232627.601005324&l=3f0d42c523
Gallery 4 http://www.facebook.com/media/set/?set=a.490098255324.297598.601005324&l=efb083b7df
Gallery 5 http://www.facebook.com/media/set/?set=a.10150244028550325.366987.601005324&l=583fd5cd3a
Gallery 6 http://www.facebook.com/media/set/?set=a.10150550640070325.430417.601005324&type=3&l=fe779b358c
Duratec Engine Swap https://www.facebook.com/media/set/?set=a.10152527759580325.1073741828.601005324&type=1&l=40aae5e72f " target="_blank"> https://www.facebook.com/media/set/?set=a.10152527759580325.1073741828.601005324&type=1&l=40aae5e72f
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