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| Home > Help Needed / General Tech Chat > carb question and butterfly question, help needed, sorry | |||||||
 530 Posts Member #: 1192 Post Whore In the garage......again!! |
7th Sep, 2008 at 04:16:54pm
done the search, but still can't find an answer, there seems to be a small hole on the carb near where one of the plenumn bolts go through, whats it for and should it be blanked off, when i put the plenumn on, the gasket did not have the gole in it for this so i punched a hole through, just wondering if itis contributing to the excessive air intake.
133.5 bhp 123 lb torque 116mph @6640rpm 9.5psi
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4314 Posts Member #: 700 Formerly British Open Classic The West Country |
7th Sep, 2008 at 04:23:48pm
This hole is vital do not blank it off! If there is not a hole in the gasket already made one.
Edited by Rob H on 7th Sep, 2008. Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer |
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Site Admin  15302 Posts Member #: 337 Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner & TM legend. |
7th Sep, 2008 at 04:40:31pm
Butterfly is correct, but you can usefully replace it with a solid type to get rid of the obstruction caused at full throttle.
On 29th Nov, 2016 madmk1 said:
On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else Like fuel 😂😂 |
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530 Posts Member #: 1192 Post Whore In the garage......again!! |
7th Sep, 2008 at 06:46:19pm
Rob, that thread you posted was great, easily explained the balancing of the carb. I'm a lot wiser for that, cheers. 133.5 bhp 123 lb torque 116mph @6640rpm 9.5psi
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4314 Posts Member #: 700 Formerly British Open Classic The West Country |
10th Sep, 2008 at 09:23:41pm
Don't thank me, thank TD for explaining the workings of a boosted SU in plain English. Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer |
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 2370 Posts Member #: 719 Post Whore Horndean - Near Portsmouth |
21st Sep, 2008 at 03:28:44pm
On 7th Sep, 2008 Tom Fenton said:
Butterfly is correct, but you can usefully replace it with a solid type to get rid of the obstruction caused at full throttle. Just rebuilding my turbo '44 at then moment and have had a read through this thread: http://www.turbominis.co.uk/forums/index.php?p=vt&tid=1675 I bought the carb service kit from Avonbar which didnt come with a solid butterfly. So, can I use this butterfly with the poppet valve then? Will it obstruct the flow that much? I cant see where else you can buy the solid butterfly's from apart from that rebuild kit!! |
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 4641 Posts Member #: 20 My sister is so fit I won't show anyone her picture Lake District |
21st Sep, 2008 at 03:55:44pm
You can use the butterfly with the poppet valve, yes. Obviously removing it will help flow a little, every little helps.
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2370 Posts Member #: 719 Post Whore Horndean - Near Portsmouth |
21st Sep, 2008 at 06:26:01pm
Nah it doesnt which is a pain, i only bought the service kit and it seems to be the only thing that isnt in it!!
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 2500 Posts Member #: 648 Post Whore Northern Ireland (ex AUS) |
21st Sep, 2008 at 11:02:59pm
You can cut out the valve and braze the hole over. I don't really get why there is a poppet valve in turbo SUs, it must allow a lot of air through when your on boost and you snap the throttle shut! On 7th Nov, 2008 Nic said:
naeJ m !!!!!!sdrawkcab si gnihtyreve ?droabyekym ot deneppah sah tahw ayhwdd |
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2370 Posts Member #: 719 Post Whore Horndean - Near Portsmouth |
21st Sep, 2008 at 11:14:25pm
On 21st Sep, 2008 Jay#2 said:
You can cut out the valve and braze the hole over. I don't really get why there is a poppet valve in turbo SUs, it must allow a lot of air through when your on boost and you snap the throttle shut! Hmm got now access to braising!! Will a nut an bolt do? 
Pain in the arse! Should have just got the full rebuild kit instead of the service one, typical tight bastard. |
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 1060 Posts Member #: 588 Post Whore Delaware, USA |
22nd Sep, 2008 at 01:40:57am
On 21st Sep, 2008 richminiturbo. said:
Pain in the arse! Should have just got the full rebuild kit instead of the service one, typical tight bastard. You can buy just the butterfly disc at minispares, comes with a couple of extra gaskets.. 6 quid or so??.... Terry website:- http://www.terryhunt.co.uk
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2370 Posts Member #: 719 Post Whore Horndean - Near Portsmouth |
22nd Sep, 2008 at 08:18:57am
Thanks terry!
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2500 Posts Member #: 648 Post Whore Northern Ireland (ex AUS) |
22nd Sep, 2008 at 09:05:18am
The HIF44 is a 1.75" carb though.
Edited by Jay#2 on 22nd Sep, 2008. On 7th Nov, 2008 Nic said:
naeJ m !!!!!!sdrawkcab si gnihtyreve ?droabyekym ot deneppah sah tahw ayhwdd |
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2370 Posts Member #: 719 Post Whore Horndean - Near Portsmouth |
22nd Sep, 2008 at 10:03:28am
On 22nd Sep, 2008 Jay#2 said:
The HIF44 is a 1.75" carb though. Found this: http://www.minispares.com/Product.aspx?pid=42387 http://www.minispares.com/Product.aspx?pid=38162 I think the difference in the turbo and non-turbo kits is the gaskets not the disk. brilliant thanks buddy! "Throttle Disc" for fuck sake! I was looking for the obvious "butterfly", of course it wouldn't be that simple |
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Site Admin  8506 Posts Member #: 16 Sold the turbo and seeing what the C20XE can do! Near Lincoln |
22nd Sep, 2008 at 11:57:56am
Yeah Phil, the kits i order i spec with a plain disc so they will have carried that on.
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4314 Posts Member #: 700 Formerly British Open Classic The West Country |
22nd Sep, 2008 at 12:40:30pm
On 21st Sep, 2008 richminiturbo. said:
Will a nut an bolt do? Might restrict the airflow a bit, lol. Isambard Kingdom Brunel said:
Nothing is impossible if you are an Engineer |
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Site Admin 8506 Posts Member #: 16 Sold the turbo and seeing what the C20XE can do! Near Lincoln |
22nd Sep, 2008 at 01:38:30pm
best thing to do is solder it up to make the neatest job without buying a new plate. |
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