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infow(at)shaw.ca
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 Posted: Mon Mar 18, 2013 1:32 pm Post subject: Rotec TBI-40 injection (sleeved to 36mm) |
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G'Day Lynn...
I have a question in regards to the Rotec TBI-40 injection! How has it worked out? What do
you mean - sleeved to 36mm? Was the TBI-40 to big? I was thinking about the TBI-40... but
Rotec recommended a TBI-32-2 instead!
Ron
:--)> Rotec TBI-40 injection (sleeved to 36mm)
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Lynn Matteson
Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan
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| Posted: Mon Mar 18, 2013 5:27 pm Post subject: Rotec TBI-40 injection (sleeved to 36mm) |
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Hi Ron-
Yes, it has worked out well for me. When I first looked at the TBI-40
at Oshkosh in 2009, Paul (from Rotec) told me that the -40 would
probably be a bit too much throat area for my 2200 cc Jabiru engine,
and that I might have to restrain the throttle opening by 1/4" or so.
This is because the TBI-40 was originally designed for their 2800 cc
engine, and therefore the throttle opening needed to be larger for
that size engine. I did this for a while, but later on, I made a
sleeve that is a push fit into the air inlet...before the slide
throttle. Because that area of the TBI is slightly tapered, it was
fairly simple to turn out a sleeve on my lathe that would push into
the air inlet, and could not be sucked further into the
airstream...works great, and I also have a sleeve that is 35 mm
inside diameter that I made at the same time, for testing purposes.
When I got the TBI, I got the round rear housing, to slide right into
where my Bing was, but in building various intake manifolds, I
decided to get the -3 rear housing, the one with 4 bolts, so I could
more easily adapt to the manifolds I was designing.
I noticed that Rotec was selling the 32 mm's for VW, etc. If you get
too large a carb/TBI, the air speed through the device will not allow
proper fuel atomization, thus the reason for making the smaller units.
Here is a shot of the sleeve in place, as viewed from the air inlet end:
Lynn Matteson
Kitfox IV Speedster, taildragger
Jabiru 2200, #2062
Prince prop 64 x 30, P-tip
Electroair direct-fire ignition system
Rotec TBI-40 injection (sleeved to 36mm)
Status: flying with 1417 hrs... (since 3-27-2006)
On Mar 18, 2013, at 5:32 PM, infow wrote:
| Quote: |
G'Day Lynn...
I have a question in regards to the Rotec TBI-40 injection! How
has it worked out? What do
you mean - sleeved to 36mm? Was the TBI-40 to big? I was
thinking about the TBI-40... but
Rotec recommended a TBI-32-2 instead!
Ron
:--)> Rotec TBI-40 injection (sleeved to 36mm)
|
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_________________
Lynn
Kitfox IV-Jabiru 2200
N369LM |
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infow(at)shaw.ca
Guest
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| Posted: Mon Mar 18, 2013 7:24 pm Post subject: Rotec TBI-40 injection (sleeved to 36mm) |
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Hey Thanks Lynn!
:--)> Hi Ron-
:--)> Yes, it has worked out well for me. When I first looked at the TBI-40 at Oshkosh in
:--)> 2009, Paul (from Rotec) told me that the -40 would probably be a bit too much
:--)> throat area for my 2200 cc Jabiru engine, and that I might have to restrain the
:--)> throttle opening by 1/4" or so. This is because the TBI-40 was originally designed
:--)> for their 2800 cc engine, and therefore the throttle opening needed to be larger
:--)> for that size engine. I did this for a while, but later on, I made a sleeve that is
:--)> a push fit into the air inlet...before the slide throttle. Because that area of the
:--)> TBI is slightly tapered, it was fairly simple to turn out a sleeve on my lathe that
:--)> would push into the air inlet, and could not be sucked further into the
:--)> airstream...works great, and I also have a sleeve that is 35 mm inside diameter
:--)> that I made at the same time, for testing purposes. When I got the TBI, I got the
:--)> round rear housing, to slide right into where my Bing was, but in building various
:--)> intake manifolds, I decided to get the -3 rear housing, the one with 4 bolts, so I
:--)> could more easily adapt to the manifolds I was designing.
:--)>
:--)> I noticed that Rotec was selling the 32 mm's for VW, etc. If you get too large a
:--)> carb/TBI, the air speed through the device will not allow proper fuel atomization,
:--)> thus the reason for making the smaller units.
:--)>
:--)> Here is a shot of the sleeve in place, as viewed from the air inlet end:
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