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MG MGB GT V8 Factory Originals Technical - HIF 8's?

Thinking of doing a custom project, just wondering if SU made HIF 8 (2" bore?) carburetors. If they did, what were they used on?
Thought about using HIF 6's, but they may not flow quite enough CFM. Or can the 6's be modified to flow more air?
Bill
bill jacobson

Bill
Not really my area - gave up HIF6s because they wre so inefficient in slow traffic - however the most cost effective way to increase breathing used to be short stub intakes with better airfilters (like the RV8 - I am sure you have an American version) - with the right needle they produced a lot more power than the GTV8.

All that said - believe there is a 2" version - but then you need all the manifolding.

Roger
London - Petrol $8 gallon.
RMW

Bill,

I think Jaguar used 2" SU carbs, possibly on the MkX cars. Might be interesting to look in that direction?

fwiw,

Alex
Alexander M

Bill,
S U did make carbs with a 2" bore (HF 8's). The only application I am aware of is by Rolls Royce in their V8 engines but there were undoubtedy others.

One standard 2" SU can flow about 330 CF/min acording to figures run by David Vizard some time ago.

What is the project by the way?

Pete.
Peter Thomas

Forgot to mention the use by Jaguar of the HD 8 types which are most likely more easily sourced.

Cheers , Pete.
Peter Thomas

Bill,

What about a couple of Harley carbs? Maybe a couple of big Mikunis?

http://www.mikuni.com/fs-carburetor.html
Carl Floyd

Thanks for the info guy's! Going to the ABFM tomorrow, I'll do some looking in the swap meet area and see if there are any Jag/Roll's carb's.

Peter, I have a M90 supercharger that "needs" to find a home! The M90 just happens to be the correct size for a 215 V8! The wheels have been turning in head about putting it on the V8 B. I would like to be able to fit it under the hood. I've done some rough measurement's, and I think I can make it work. However it'll require a lot of fabricating, such as a low-profile intake manifold, a smaller driven pulley, custom drive pulley, distributer-less ignition system, (clearance issue's between the drive snout and distributer) as well as a custom made induction system. Could be fun!

According to Eaton's web site, the M90 inlet flows at 550 CFM at 12000 rpm (blower speed). Two H6's flow approx 480 CFM, which is why I was interested in the H8's. At 330 CFM each they may a little large, however they'll only open to what engine demand is, so they just might work.

Carl, I didn't think about using Mukuni's. I know from working on snowmobile's that mukuni carb's are very tuneable. Seem's like there is an infinite amount of tuning parts for them. They're compact size would be a added bonus also.
bill jacobson

Bill, you really should contact me. I can help you out on this one I think, in fact I've been kicking around a design for an underslung intake for several years. As for carburation, have you considered EFI? As long as you are fabbing up an intake you might as well include injector bungs. It makes the whole job easier, especially the tuning.

Jim
(859) 816-2187
Jim Blackwood

Bill:

I have a set of two inch SU carbs that I used to run on the MGB. Look in page two of the following site for some pics. They are currently on a MGB manifold. I thought they were off a rover?!

http://www.cardomain.com/ride/2203663

Pete
Pete

Jim, I havn't ruled out fuel injection. Looks like there could be an issue with a low profile intake and having enough clearance at the blower housing to allow the injectors to be mounted at the proper angle. So they can spray towards the backside of the intake valve. Another suggestion I recieved would be to mount say 4 injectors at the backside of a throttle body, kind of a hybrid throttle body injection system.
I'll try and get a hold of you and go over some ideas.

Pete, those would look pretty good feeding a supercharger. It would give it that clasic British sports car look.
bill jacobson

Here's someone who seems to be a Mikuni fanatic who might be able to give some advice. Seems to be able to make them work pretty well on Triumphs!

http://www.prirace.com/induction.htm


Derek Nicholson

Bill,

'65 through '67 Austin Healey 3000s (BJ8) used 2" SUs.
'63 and '64 (BJ7) used 1 3/4 in SU.

Good luck on your project.

Al
Al Wulf

Thanks Al, It looks like I may be going the fuel injection route. I originally was going to go with the SU's.
Now that I started the process of fabricating an intake manifold, I can see that the blower housing will need to be further back for proper cylinder distribution. The blower inlet is at the rear. This dosn't leave much room for the carb's and adapting manifold they would require. It could be done, but it probably would be fairly restrictive on the intake side.
Fuel injection also as the added bonus in that it should be faily easy to build a cold air induction system. This should help keep blower outlet air temps down while under boost!
bill jacobson

This thread was discussed between 21/07/2006 and 28/07/2006

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