5 replies to this topic

[Snowfruit]

I bought a new Minisport inlet manifold some time ago. This weekend I went to fit it with my original carburettor (on a 1989 Racing Green 998cc) which as far as I know is a HS4 (?).

Now the manifold has four studs in a rectangular arrangement where the carburettor has only two holes in sort of a diamond layout...

Am I right in thinking that the manifold has been made to fit more than one type of carb, and that I can mount my carb onto the two opposing studs of the manifold leaving the other tow unused? Or have I got the wrong manifold completely?

[Big_Adam]

Yes, the manifold will also fit a slightly larger carb (it's in one of my vizard books, too lazy to find it. sorry). As long as the carb fits you should be fine. Just remove the two extra studs.

[Snowfruit]

Thanks for that thats taken a load of my mind

[Snowfruit]

Just another thought... will there be a problem matching the hole (for the air) in the manifold to the one on the carb? i.e. square hole onto round hole? or will the flange cover this?

[Big_Adam]

eeeh? Square?

the onyl thing that matters is the hole in the carb and the hole in the manifold. If the one in the manifold is bigger then you're okay. If it's smaller then there is a restriction.

[Guess-Works.com]

yup, manifold designed to fit both HS and HIF type carbs, but the bottom left and top right are the ones you'll be fixing the HS to. The hole as standard will probably only be 1.1/2" in diameter in the manifold anyway as it's quite common to have to grind them out when using a larger 1.3/4" HS6 or HIF44. If it is bigger ( use the plastic spacer as a guide ) it will cause a little turbulence in the air flow, but will not impact performance to any great degree.