Ive got a set of 38mm R6 TB's and am contemplating how difficult it would be to buy another set (though i only need 6, not 8), and put them on
BOB. Im wondering what the added advantage would be over a custom inlet plenum.
I am restricted for space, and the TB's wont really help the issue, but its not the end of the world.
Engine is a 2.9 Cosworth (BOB) V6.
Questions are:
As far as I can work out , I gained close to 30 bhp and moved peak power from 5600 to 7300 on a mechanically standard 1.8 V6 Mazda - that was with
41mm Triumph TB's .
I think I'm getting similar gains on the 2.5 - it pulls like a train right up to 8000 , and still managed 34.6 mpg cruising up from Detling at
the weekend .
The stock plenum/manifold on the Mazda V6 is pretty restrictive though - and enormously heavy .
A big plus is you get an engine that looks like this
[img][/img]
OK thanks. The more i sit here with the four barrels sitting on the table in front of me, the more im convincing myself that this is the way
forward!!
Does anyone know where to get fuel rail material from? I was planning on using six TB's -one for each cylinder - and utilising the existing
rails.
Three of the ports on each rail would feed fuel to opposite cylinder banks, so the rail would effectively be on its side. The remaining port on each
would be joined, with a Tee off for the fuel, though i would need to figure out a return to the tank this way. Perhaps a PRV which allows fuel back
to the tank over a certain pressure....?
Has anyone used braided fuel hose to connect to injectors before?
That sounds like a bad idea - without a through-flow of fuel any air would only be able to get out via the injectors , and the fuel sitting in the
rails would also pick up a lot of heat .
Far better to run the fuel in one end of one rail , and return from the other end of the other rail - like this ?
[img][/img]
OK, i see your point. So if i were to modify the existing R6 rails and either make up solid or flexible connections to the injectors, it should look
like this;
Fuel Rail Concept
These are my TB's by the way.
TB's
That would probably work - but how would you hold the injectors in place ? They are normally clamped in by the fuel rails .
Another problem is linking the two banks of TB's - it took me a long time to design my linkage......(picture in my photo archive , in throttle
bodies)
I reckon if its going to look similar to Claires set up then you should do it purely because it'll look fantastic !
Shiny & Carbon, niiiiiice :-)
Wow that looks very nice Claire.
To answer a question from the first posting:
http://www.rossmachineracing.com/
To answer a second. Balancing the TBI's wouldn't normally use a colortune. The normal way of doing it is to balance the flow and hence
pressure. This can either be with a carbalancer/Morgan carbtune/ or similar type of device. Some people claim to listen down a pipe for the hissing
and balance that way but that is too difficult for me.
Matt
If i put solid links between the rail (secured to the head) and the injectors, then this would hold them in place.
The linkage is the fun part, and i have a solution, but itll need some planning and development nearer the time. Ive even thought about joining the
butterfly shafts together so that they are one piece all the way through on each side, but again that needs some more thought.
quote:
Originally posted by matt_gsxr
To answer a second. Balancing the TBI's wouldn't normally use a colortune. The normal way of doing it is to balance the flow and hence pressure. This can either be with a carbalancer/Morgan carbtune/ or similar type of device. Some people claim to listen down a pipe for the hissing and balance that way but that is too difficult for me.
quote:
Originally posted by Andybarbet
I reckon if its going to look similar to Claires set up then you should do it purely because it'll look fantastic !
Shiny & Carbon, niiiiiice :-)
quote:
Originally posted by MakeEverything
Youll hear it when it starts up for the first time!!!!
Richard why do you want to cross supply the injectors, your BOB is the same as my BOA in as much as it runs batch fire, giving two or three squirts of fuel to each bank. So 123 and 456 both recieve fuel at the same time respectively. I think the old saying, "If it aint broke, don't fix it" applies here mate. You are just making a load of work for no gain. Cheers Ray
quote:
Originally posted by Chippy
Richard why do you want to cross supply the injectors, your BOB is the same as my BOA in as much as it runs batch fire, giving two or three squirts of fuel to each bank. So 123 and 456 both recieve fuel at the same time respectively. I think the old saying, "If it aint broke, don't fix it" applies here mate. You are just making a load of work for no gain. Cheers Ray
quote:
Originally posted by clairetoo
quote:
Originally posted by MakeEverything
Youll hear it when it starts up for the first time!!!!
I wonder if it will sound anything like this
Bought a second set of TB's today. exactly the same from an '04 bike, for £57!
All i need now is the standard manifold and one for the TB's and were good to go!
with regards to the fueling....
on a flat four the standard rail setup is in series.....on advanced tuning it is common practice to change to parrellell, via a manifold blockthen to
the regulator back to the tank....this stops the last cylinder to be on the line getting lower preasure than the others stopping it from leaning
off.....
this may be different on a v6 for some reason???
as to fitting the injectors, i have some alloy injector cups that take a side fed injector, you are welcome to them....you could fit them into a
flange adaptor???
quote:
Originally posted by boggle
with regards to the fueling....
on a flat four the standard rail setup is in series.....on advanced tuning it is common practice to change to parrellell, via a manifold blockthen to the regulator back to the tank....this stops the last cylinder to be on the line getting lower preasure than the others stopping it from leaning off.....
this may be different on a v6 for some reason???
as to fitting the injectors, i have some alloy injector cups that take a side fed injector, you are welcome to them....you could fit them into a flange adaptor???
quote:
I might be tapping you up for some help in plumbing the cooling system if thats ok please?