Sideways 2 Victory
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| posted on 23/10/02 at 06:45 PM |
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Twin 40 Dellortos vs SVA inspector?
Hi folks,
My build is progressing nicely now, time to reassemble my engine... many questions.
I've just sourced a set of twin 40 dellortos but am dubious as to how these fuel guzzling things will effect the emissions part of the SVA test.
Also book built cars with twin carbs all seem to have them protruding through the side of the bonnet this doesnt sound very SVA friendly either. Are
filters obligatory or would some kind of alu. airbox and ducting tube work?
How have you others dealt with these two issues?
Is it best to just use a standard downdraft webber at SVA time?
If that's so which carb should I set the basic timing for and perform running in process with ?(on a newly rebuilt 1660 X/F, BVH, BCF2 cam.)
Will a standard carb lean out a tweaked crossflow to the point of damaging it if I set the car up for the 40's then just take em off and put the
standard carb/manifold on for test day?
Hehe then I'm into the carb/bonnet clearance issue - ho hum
What to do, please help.
Many thanks
Dave
[img]a15435-lc3.jpg[/img]
www.nurburgring.org
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locodude
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| posted on 23/10/02 at 07:27 PM |
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First we need to know which engine you're using. If it's a x-flow then you can get the carbs inside the bonnet but you'll have to get a short inet
manifold and shorten the sump to get the engine lower. As for emmissions if it is a x-flow then you should be fine providing the carbs are tuned
correctly. Check out my website for pics (build story and mods page).
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Sideways 2 Victory
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| posted on 23/10/02 at 07:33 PM |
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Hi locodude,
Yep seen your site but not read it in detail.
I do state in my post 1660 X/F, BVH, BCF2 etc,
Hoping to get 120bhp at a push but want bulletproof rather than top end.
40's are ok, hmm would never have thought it.
Cheers
Dave
www.nurburgring.org
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locodude
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| posted on 23/10/02 at 07:56 PM |
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If you've seen 'A Race car is born' they tune the twin 40's on that car (1.8 Zetec) to get the emmissions down for SVA and two friends of mine
have also done it, one with a Pinto and the other with a Toyota 4AGE. So it can be done! Both SVA'd at Derby by the way.
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chrisg
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| posted on 23/10/02 at 08:13 PM |
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Surely the way to go is to stick the original carb on for the SVA and then bin it on the way home?
Cheers
Chris
Note to all: I really don't know when to leave well alone. I tried to get clever with the mods, then when they gave me a lifeline to see the
error of my ways, I tried to incite more trouble via u2u. So now I'm banned, never to return again. They should have done it years ago!
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Sideways 2 Victory
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| posted on 23/10/02 at 08:16 PM |
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ChrisG
thats what i thought but am worried about damaging the engine by running it too lean.
And by the bonnet clearance of a downdraught.
Cheers
Dave
www.nurburgring.org
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david walker
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| posted on 23/10/02 at 09:23 PM |
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I went through the SVA with 1700 X'Flow on twin 40's without a problem. I found a pre 75 (1973) engine (maybe should say engine number!) and as such
is not subject to any emmission test. Even after 75 the test is so lax you'll get through anyway.
The BCF2 cam is pretty mild so I don't think you'll have a problem running the std carb. For the same reason you will be struggling to realistically
achieve 120bhp.
On the carb though the side you'll have no problem assuming you are going to fit K&N filters or similar. The edge radius passes OK.
You will have to watch bonnet height though. Keep the engine as low as possible and the filters will just come nicely over the top chassis rail. I
didn't and have a bit of an usightly bonnet bulge, or at least have until I change the manifold - which I can do because I don't use a distributor.
Dave Walker, Race Engine Services - 07957 454659 or 01636 671277
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david walker
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| posted on 23/10/02 at 09:26 PM |
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By the way your car is looking very nice but beware of the indicator position. I suspect they will be too far back to pass the SVA visibilty test.
Dave Walker, Race Engine Services - 07957 454659 or 01636 671277
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Sideways 2 Victory
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| posted on 23/10/02 at 09:51 PM |
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David Thx,
I do have a lot of Mods to get the SVA done, the car was built to as shown in the photo by a guy who was gonna do the race series but had to change
his plans.
I want to build a road legal track day car out of it. Got the donor as well so should be ok.
I've got engine/box/carbs/ancilliaries, need Prop, seats, belts, bonnet, exhaust and a load of SVA tweaks to finish.
Especially the electrics!!
So you say go with the 40's but make sure there set up properly? I take it that means they need a full rebuild??
Cheers
Dave
www.nurburgring.org
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B@man
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| posted on 24/10/02 at 08:31 AM |
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The Stylus passed the SVA no probs with twin 40's on a 1800 Zetec. The engine had not even been set up and was running very rich. at idle the CO was
less than 1% but the HC was something like 3000ppm, increasing the idle to 2500 rpm had the HC dropping to 800 ppm so it passed. as long as you have
the idle jets somewhere near you should be OK. after the engine had been set up on a dyno the idle CO is now around 0.6 and the HC under 500 ppm.
which is pretty close to an injected car !.
All I did was balance the carbs and then adjusted the idle mixture screws for a nice smooth idle.
Shame the car failed on 9 other issues really 
Projects :
Robin Hood S7 - Deceased !
SSC Stylus 16v - Sold
Spartan Zetec conversion
Rickman 2.0 Petrol (New Engine) - Sold
Rickman 1800 TD (ongoing)
TVR 400SE (Nearly a kit ?)
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