andylancaster3000
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| posted on 15/11/10 at 03:32 PM |
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Food for thought - Dellorto 45s as throttle bodies.
On our mission to cut the cost of an EFI setup for a Duratec the idea passed my mind whilst dosing off last night that we'd been wasting our
time in trying to find a setup of bike throttle that can be re-spaced and have 45mm butterfly diameter or finding some 2nd hand Jenveys when we had a
set already in the garage in the form of some 45 DHLAs.
We've had these 45's knocking round in the box of carbs for years, they're in very good nick so I thought why not take the top plate
off and replace it with a flat piece of ally, block up any jets likely to cause an air leak, remove the aux' venturi and choke and bobs your
auntie, we have a set of 45mm DCOE style throttles for free. Can anyone see a problem with this?
Yes, they might be a little un-sightly and be a touch heavy but with the top plate replaced for a bit of ally I don't think they'd be too
tragic, certainly not when they free. You might argue that we should sell them and use that money to go towards a set of 2nd hand jenveys or similar
but they're slightly incomplete and missing some parts that I was quoted £130 to replace. I'm not wishing to change them beyond the point
of being able to revert to their original carb guise (as per the CCC magazine article a while ago) hence not machining them back to just the
throttles!
Anyway, thoughts would be welcome...
[Edited on 15/11/10 by andylancaster3000]
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James
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| posted on 15/11/10 at 03:45 PM |
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Only thought is:
hmmm, I have a set of (I think useless Dellortos) and a matching manifold.
Keep us updated with your progress... 
Cheers,
James
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atspeed racing
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| posted on 15/11/10 at 03:50 PM |
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I have seen this a few times i the past.
Someone also used a DGAV carb as his throttle body.
Seemed to work ok.
Good luck
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NOTE:This user is registered as a LocostBuilders trader and may offer commercial services to other users
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owelly
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| posted on 15/11/10 at 03:58 PM |
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Or just use the spindles and butterflies and make your own TB out of thick walled ally?
http://www.ppcmag.co.uk
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andylancaster3000
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| posted on 15/11/10 at 04:07 PM |
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Will keep progress posted. Only have very few pics so far but the block is in are done, clutch/flywheel done, sump job underway so just need to sort
the inlet and exhaust!
Owelly: We have been discussing that as the next step also!
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RazMan
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| posted on 15/11/10 at 04:10 PM |
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quote:
Originally posted by owelly
Or just use the spindles and butterflies and make your own TB out of thick walled ally?
That might be the best option - after you have finished blocking up all the jets and other unwanted holes you might as well start from scratch,
although the manifold is the hardest thing to make, and the butterflies are relatively easy,
That is why I decided to make ITBs from my V6 lower inlet manifold.
http://www.locostbuilders.co.uk/viewthread.php?tid=145114
[Edited on 15-11-10 by RazMan]
Cheers,
Raz
When thinking outside the box doesn't work any more, it's time to build a new box
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andylancaster3000
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| posted on 15/11/10 at 04:28 PM |
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We fortunately already have a DCOE style manifold so that gets rid of a fair chunk of work!
Due to where the butterflies are there aren't many, if any jets downstream of the butterfly. Maybe some idle related ones, so I was assuming
this wouldn't be an overly difficult task. (I haven't got them to hand so can't look at them more closely)
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Neville Jones
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| posted on 15/11/10 at 04:38 PM |
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PPC/Dave Walker did a series on this many years ago. Hardest part is getting some bosses welded on for the injectors. As I recall, though may be
inaccurate, but the carbs are not made from ali as we know it.
Cheers,
Nev.
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andylancaster3000
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| posted on 15/11/10 at 04:40 PM |
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I have seen this series, I think it was re-printed in PPC eventually.
The duratec has injectors in the head so I was hoping to use these.
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Werner Van Loock
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| posted on 15/11/10 at 06:00 PM |
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It has been done before, only difficulty is the location for injectors, but as you say the duratec has the injectors in the head, so does the Zetec SE
and the toyota 4age. Don't know about other engines.
Zetec (E) and ST170 duratec(=zetec) don't have them and then it gets difficult.
http://www.clubstylus.be
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r1_pete
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| posted on 15/11/10 at 06:11 PM |
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Just take out the chokes etc, and replace them with a suitable diameter / wall thickness ally tube, fill the progression holes and primary drillings
with with something like belzona - easily done from the top after removing the screws.
You can then leave the top covers on and looking like carbs.
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MikeR
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| posted on 16/11/10 at 09:34 PM |
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I've had similar thoughts - but i'll weld in the injector bosses onto a home made steel dcoe manifold.
(got lots of manifold ideas)
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