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 Post subject: Big Fat New Carb for the MGB :)
PostPosted: Sat Dec 15, 2012 8:40 pm 
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Wizard

Joined: Thu Apr 19, 2007 7:45 pm
Posts: 3963
Location: Bucks
Since my last dyno session I've found that the old Weber 800 is too small for the Rover V8.

I first fitted a Weber 500 when the engine was carb + nitrous.
Then went up to a Holley 600dp for even more nitrous fun.
Then fitted the supercharger and needed more so fitted the Weber 800 cfm carb.

Now it seems that the new engine needs more still. Its a pretty well sorted engine and I've worked on engine VE of 90% at 5800 rpm. The new lump displaces 4.8 litres now. When i add in the boost factor calculation for the 13psi i want to use I need about 950cfm from the carb. So I've just got a Holley 1050cfm Dominator.

Its fookin huge !

I've just ordered the adaptor from the states to make it fit the blower.

No prizes for guessing which is the new carb :omgrofl:


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1975 MGB Rover V8 aka Slim Rabbit 9.62 @ 137.37 mph with 175 shot.
9.59 here I come !!!!


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 Post subject: Re: Big Fat New Carb for the MGB :)
PostPosted: Sat Dec 15, 2012 8:57 pm 
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Wizard

Joined: Fri Sep 09, 2005 3:10 pm
Posts: 564
Location: Clitheroe
My first guess would be the right hand one! :lol: :lol: :yes:

Now that's a mans size carb! :shock:

Ian

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Reliant Kitten, was NA and Nitrous;- 11.50@118 in 2014, now we'll see in 2015!


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 Post subject: Re: Big Fat New Carb for the MGB :)
PostPosted: Sat Dec 15, 2012 9:33 pm 
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Wizard

Joined: Thu Apr 19, 2007 7:45 pm
Posts: 3963
Location: Bucks
Oddified wrote:
My first guess would be the right hand one! :lol: :lol: :yes:

Now that's a mans size carb! :shock:


Ian



Darn it!!
You guessed right first time Ian :omgrofl:

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1975 MGB Rover V8 aka Slim Rabbit 9.62 @ 137.37 mph with 175 shot.
9.59 here I come !!!!


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 Post subject: Re: Big Fat New Carb for the MGB :)
PostPosted: Sun Dec 16, 2012 1:51 pm 
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Site Admin

Joined: Thu Feb 03, 2005 6:07 pm
Posts: 18701
Location: Doncaster
That's a lot of carb for such a small engine!!! :shock:

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Trev (The WIZARD of NOS)

30 years of nitrous experience and counting!!!!


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 Post subject: Re: Big Fat New Carb for the MGB :)
PostPosted: Sun Dec 16, 2012 5:38 pm 
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Learner

Joined: Sat May 07, 2011 6:34 pm
Posts: 231
Location: Cheshire
is the next size up just a bucket that pours fuel into the engine?

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 Post subject: Re: Big Fat New Carb for the MGB :)
PostPosted: Tue Dec 18, 2012 9:39 am 
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Wizard

Joined: Thu Apr 19, 2007 7:45 pm
Posts: 3963
Location: Bucks
It seems I need 926 cfm if I'm to run 14psi at 5800 rpm on a 4.8 :)

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1975 MGB Rover V8 aka Slim Rabbit 9.62 @ 137.37 mph with 175 shot.
9.59 here I come !!!!


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 Post subject: Re: Big Fat New Carb for the MGB :)
PostPosted: Thu Dec 20, 2012 7:31 pm 
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Wizard

Joined: Thu Apr 19, 2007 7:45 pm
Posts: 3963
Location: Bucks
Today I spent another £75 on gaskets and tuning parts for the big boy!

Total spend for the carb is now still under £200 so I'm very pleased :D

Now I'm playing the waiting game on the manifold adaptor from Holley ???

Their website says despatch within 2 days. I paid for this adaptor last Thursday and my purchase record still say's they havent posted it yet? But they have left positive feedback on Ebay. so thats good eh ??? :scratch:

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1975 MGB Rover V8 aka Slim Rabbit 9.62 @ 137.37 mph with 175 shot.
9.59 here I come !!!!


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 Post subject: Re: Big Fat New Carb for the MGB :)
PostPosted: Fri Dec 21, 2012 8:12 pm 
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Wizard

Joined: Fri Sep 09, 2005 3:10 pm
Posts: 564
Location: Clitheroe
mgbv8 wrote:
purchase record still say's they havent posted it yet? :scratch:


Most sellers don't click the despatched box on ebay when an items been sent, so i wouldn't use that as an indicator. Depending on who they use for shipping you'll more than likely get a letter from parcel force asking for import duty, a handling fee and vat before it will be released for delivery. In my experience it will take parcel force longer to send that letter out than it does for the goods to arrive in the uk! :beatstick:

Ian

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Reliant Kitten, was NA and Nitrous;- 11.50@118 in 2014, now we'll see in 2015!


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