OOOhh that's natty....

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OOOhh that's natty....

Postby turbell » Mon Jan 16, 2017 6:00 pm

Spotted this searching for a Weber carb for another project and thought " OOohh that's natty....."

http://www.ebay.co.uk/itm/Weber-Downdra ... SwwpdW6Uwm
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Re: OOOhh that's natty....

Postby mettersl » Mon Jan 16, 2017 8:58 pm

I saw something like this last year and asked Martin about its suitability for an Atmo, as an alternative to the Holley.
I think we'd need to ask some questions about whether it will work on such a low profile manifold, and if the injector sizing is right for our (relatively large) engines, but otherwise, it looks like a simpler route into fuel injection than other routes.
You'd still need quite a few other bits....but if someone on here has knowledge or even better has used on...I'm definitely all ears.
Last edited by mettersl on Tue Jan 17, 2017 7:45 pm, edited 1 time in total.
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Re: OOOhh that's natty....

Postby ImprobableAction » Tue Jan 17, 2017 3:35 pm

You could use one of FiTech's 400HP injection set-ups, if you could machine a four-barrel adaptor (or modify the existing manifold).

https://www.summitracing.com/int/parts/ ... /overview/

Would likely work quite well, but on the flip side I think they're really designed for engines producing upwards of 200bhp – but I've seen 150bhp quoted elsewhere.

Great systems – and an all-in-one solution, too. They support blow-through installations in some configuration, so could make for a great swap on a Turbo...

https://www.summitracing.com/int/parts/ ... /overview/
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Re: OOOhh that's natty....

Postby turbell » Tue Jan 17, 2017 6:11 pm

" OOOhh..........that's natty....er."
:up
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Re: OOOhh that's natty....

Postby AreTee » Thu Jan 26, 2017 10:32 pm

Also look at jenvey.co.uk and type Renault v6 into the search box for manifolds and throttle body injection.
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Re: OOOhh that's natty....

Postby mettersl » Sun Jan 29, 2017 11:32 am

Do you think that is PRV or L series engines? Looks like they are for a 24 v engine, which is a shame...
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Re: OOOhh that's natty....

Postby AreTee » Wed Feb 08, 2017 7:23 pm

I would think they are for the 24v engine, which as you say is a shame.
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Re: OOOhh that's natty....

Postby purches graeme » Wed Feb 08, 2017 9:10 pm

I saw there two - interesting!
I am in the middle of converting my '86 Atmo to a Quick Fuel 4-barrel carb. The Quick Fuel is basically a Chinese manufactured (beautifully made) but US designed copy of a Holley, but easier to set up. Google Quick Fuel BD-450-VS 450 CFM Carburetor Black Diamond 450 CFM Vacuum Secondary for a look. Lots of great feedback on-line about these carbs, and some good videos on U-Tube.
All easily adjustable, including the vacuum secondary which like mixture, is screw adjustable rather than having to change springs. It also has an electric choke.
This model has a Teflon coated body, which is claimed to reduce the internal temperature of the carb by 6 degrees - useful in a rear engined beast where the engine compartment runs fairly warm.
450 cfm is a bit larger than the usual 390 cfm Holley used for PRV V6 conversions.
Both my Atmos have been successfuly running Weber DGAS with 38 mm chokes up until this conversion.
The Quick fuel is not nearly as tall as the DGAS, so we are machining the inlet manifold and moving the carb mount further rearward to better match manifold port lengths, with a 2 inch machined alloy mounting block welded to the inlet manifold and topped by the usual fibre insulating block. This will allow us to retain the original air cleaner, in which I run an Australian made SAAS model SF142RE free flow filter insert, designed for V8 hotrods (14 inch diameter and 2 inch depth).
The inlet manifold is also featuring a splitter to improve flow from each side of the carby to the respective inlet ports on each side, and the extra height from the manifold ports to the base of the carb will also increase gas velocity.
In my Mini racing days I my car had its carb mounted where the speedo used to be on a long manifold, and the improvement in low end torque in particular was amazing.
The lot will sit on a rebuilt engine with ported heads, slightly higher compression, the removal of all water heating to the inlet manifold and carb area, new rings/bearings, cams ground to about Stage 2 spec with spec help from Martin Faulks (thanks mate!), and a custom made extractor system each side running into separate mufflers with a balance tube, All of the porting has been designed to not only improve flow but to increase gas velocity.
The engine is now back together, and the inlet manifold and exhaust work underway.
My son, who runs a workshop in Auckland specialising in performance stuff, has been doing all the hard yards on this, fitting around his usual high workload.
I will post a heap of pix and a link to a video clip including sound once the work is complete - probably still 4-8 weeks away.
Meanwhile, I am suffering Alpine withdrawal systems, as my blue '90 Atmo has been in the paint shop since July for a full respray. The guy doing the work is Howard Savage, an Alpine whizz who worked on these cars from when they were new, and emigrated here from Ireland and now runs a paint and panel shop here. He did the repairs and total respray on my '86 after its mishap last year., and is also fitting the job around other work to help keep costs down, He did the repairs and total respray on my '86 after its mishap last year,
Great to have knowledge and experience on my doorstep!

Cheers
Graeme
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Re: OOOhh that's natty....

Postby purches graeme » Wed Feb 08, 2017 9:38 pm

Correction - the Black Diamond Quick Fuel carb reduces carb temperature by 6%, not 6 degrees.
Sorry for the blunder, which just goes to show, pobody's nerfect!
Cheers again
Graeme


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