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mikuni carb kit for mg midget

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TheRocker Avatar
TheRocker Jonathan Abbinante
Las Vegas, NV, USA   USA
1961 Austin-Healey Bugeye Sprite "Rockers"
1973 MG Midget "Rocker"
Anyone ever done a conversion on a 1275? http://www.v-performance.com sells them but has know idea regarding my 73 Midget

anyone out there got a conversion how do you find the manifold, maybe like the one i posted? Thank you.

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trevorwj Avatar
trevorwj Trevor Jessie
Louisville, KY, USA   USA
Maybe contact APT about the manifold. www.aptfast.com



Midget 50th - A Spridget Event
It was a Blast!
http://sprite-midgetclub.org/

Kerr Avatar
Kerr Platinum Member Norm Kerr
Ann Arbor, MI, USA   USA
what problem are you aiming to solve by swapping from SUs to a Mikuni?

(I only ask because it might be really hard to find a manifold designed to fit one to a 1275, if you don't have any luck tracking down the one in the photos you'd posted)

Advertising hype aside, there isn't much in the way of "untapped power" to unleash swapping to different carburation, on an A series. Typically, larger carbs are fitted to get higher WOT hp numbers, but at the expense of torque in the lower RPM range, decreasing overall drivability. Useful in racing, and for advertising, but not so much on the street.

A lot of times the biggest area for gain is the head, not the carbs. An SU on the stock intake manifold is a straight shot into the head, but then the head breathing from the factory can be restrictive. In general, the biggest gains can come from porting (and raising compression ratio, and warmer cam profile).


N

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geezer Avatar
geezer Silver Member charles durning
Magee, MS, USA   USA
1958 MG Magnette ZB "Chick Magnette (sold)"
1967 Morris Minor 1000 Saloon (2-door) "Marvin"
1974 MG MGB GT
On the subject of the manifold, that is a common performance enhancement the Mini guys use. The manifold can be found at any of the Mini parts suppliers. Try MiniMania, Mini Spares, A Series Spares, 7 Ent. They all carry the manifold as well as the companion HIF44 carb tuned for the 1275. Some might even carry the Mikuni carb. The Mini guys rave about changing to the single carb for performance and driveabality.

I don't see why it wouldn't work in a Midget. My only concern on a Midget is hood clearance. For the Mini application the carb is tilted up slightly to clear the firewall.



Who's version of right are we talking about? When you get 10 LBC owners in a room you'll get 12 different answers.

trevorwj Avatar
trevorwj Trevor Jessie
Louisville, KY, USA   USA
Many midget owners in the UK prefer the single HIF44 carb. The only downside I can see to the Mikuni is the small float bowl.



Midget 50th - A Spridget Event
It was a Blast!
http://sprite-midgetclub.org/

Kerr Avatar
Kerr Platinum Member Norm Kerr
Ann Arbor, MI, USA   USA
The SU HIF44 is an excellent way to simplify carb set up (no balancing needed), and as Rover showed in mass production, worked very well on the '90s 1275 minis. As Charles pointed out, there is no current manifold made which avoids the hood clearance issue on a Midget, though. The easiest solution to that is a short dashpot from an HIF44 fitted to Volvos (I forgot which model, but a search on old threads on this website should clear that up for you). Some folks have modified mini manifolds to work by cutting/shaving, etc.

I've got twin SUs on my 1275 Midget, and a single HIF44 on my 1275 mini. Both run great and pull equally strongly. The vehicles weigh the same, and neither engine feels better than the other.

The desire to debate the pros/cons of single vs. double goes around and around, on various forums. There is certainly no downside to a single HIF44/HS6, and it is much simpler to set up (though, once the twins are set up there's no need to touch them again for 50k miles or so). In my experience, both are great and neither jumps up as remarkably superior.


N

geezer Avatar
geezer Silver Member charles durning
Magee, MS, USA   USA
1958 MG Magnette ZB "Chick Magnette (sold)"
1967 Morris Minor 1000 Saloon (2-door) "Marvin"
1974 MG MGB GT
Norm,

Thank you for your comments. Before I got my HIF44 single and manifold for my Morris i did some research on the HIF vs the HS2. The surface area of the 2 HS2 throttle plates is very close to the surface area of the single HIF44.HS6. Because of the constant depression design of the SU carb, the larger singles is very drive-able.

As I recall the carb flange can be surfaced so it is parallel with the head flange to get hood clearance. IIRC A Series Spares my now have a manifold for the Midget.

https://shop.aseriesspares.co.uk/product-category/carburettors-fuelling/su-carburettors/

They are pretty slow in answering e-mails. My best success is with calling as early as possible.

I believe their name on this forum is aseriesspares



Who's version of right are we talking about? When you get 10 LBC owners in a room you'll get 12 different answers.

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Jerram Avatar
Jerram Silver Member David Jerram
Reading, Berkshire, UK   GBR
Maniflow in the uk make a very good inlet to mate the single hif44 SU on the 1275 Sprite and Midget (avoiding bonnet clearance issues): http://www.maniflow.co.uk/index.php?view=product&from=162&product=1192



David J.

https://www.icloud.com/photostream/#A4532ODWyhgHM

wesleygarrard Avatar
wesleygarrard wesley garrard
Pekin, IL, USA   USA
1963 Volkswagen Beetle "Herbie"
1979 MG Midget 1500 "Pete"
Here is a thread on the Mikuni swap the wife and I did for her Midget.

https://www.mgexp.com/phorum/read.php?3,2605638

Although her Midget has the Triumph 1500 and we went dual carbs. For a dual carb application on a 1275, one could still use the factory manifold if the proper carb holders with the same bolt spacing as an HS2 were sourced.

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