5 replies to this topic

[brad88]

engine is a 94 cooper 1275 with hif38 at the minute,
im looking to upgrade to twin su (hs4's)

1. is this wise?
2. whats involved in changing, have searched for a tutorial but not found one!
3. will i see any power gains from them?

sorry for all the questions, any help will be appreciated as always,
thanks very much,
brad

[lrostoke]

There's an Article by Calver in one of the mini mags concerning carbs on 1275's this month.

He actually mentions that the HIF38 will supply all that is needed for the sort of power a standard 1275 will produce.

Think main difference with twins is better throttle response.

Although twin HS4 maybe a bit overkill unless you plan on further modifications

Actually fitting isn't to difficult, as long as you have the correct manifold and a matched pair of right and left carbs. inc linkages.

Not the article in the magazine but worth a read

https://www.bmw-mani...20/ArticleV.cfm

Edited by lrostoke, 07 February 2009 - 06:15 PM.

[brad88]

cheers mate, i already have a full stage 1 kit fitted aswell, so slight modifications,
brad

[brad88]

bump

[lrostoke]

Just one thing you sure its an HIF38, and not a HIF44 ??

From Haynes should be a HIF44

Mini Cooper, 1275 cc, (12A) 1990-on
Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SU HIF44

A 44 will be plenty for a stage 1 tuned 1275

[brad88]

Just one thing you sure its an HIF38, and not a HIF44 ??

From Haynes should be a HIF44

Mini Cooper, 1275 cc, (12A) 1990-on
Carburettor type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SU HIF44

A 44 will be plenty for a stage 1 tuned 1275

nope definately a hif38 for sure, i originally thought it was a 44 but found out it was a 38 when ordering my stage 1 kit