9 replies to this topic

[maston]

Seen a nice HIF38 carb for sale, is this an upgrade from a HS4 ?

Thanks

[Mal_whitby]

Not really, there's a very minor performance benefit, very minor to the point that you won't feel it, and there's some other minor benefits, and if you didn't have a carb at all then buying a HIF38 would be more advisable than buying a HS4.

But if you currently have a HS4 that's working perfectly fine, I wouldn't go to the expense of a HIF.

[maston]

Not really, there's a very minor performance benefit, very minor to the point that you won't feel it, and there's some other minor benefits, and if you didn't have a carb at all then buying a HIF38 would be more advisable than buying a HS4.

But if you currently have a HS4 that's working perfectly fine, I wouldn't go to the expense of a HIF.

Thank you, I will leave my HS4 on then )

Ian

[huw_jenks]

The advantage of the HIF38 over the HS4 is that the HIF has a bimetalic strip which moves the jet to compensate for varying fuel density, which is supposed to make it more economical for the same performance. I don't know if it would be worth swapping to a HIF carb just for this benefit though...

[Big_Adam]

I've always liked a well modified HS4.

Mostly for this reason.

If something clogs it, you can take it apart on the car. A HIF you can't as the float and etc are on the bottom of the carb. UNLESS you are a hardcore racer where the force of cornering will kill your carb (HS4 with its offset bowl can stave the car of fuel on EXTREME corners) I'd stick with HS4 carb.

[TimmyG]

I've always liked a well modified HS4.

Mostly for this reason.

If something clogs it, you can take it apart on the car. A HIF you can't as the float and etc are on the bottom of the carb. UNLESS you are a hardcore racer where the force of cornering will kill your carb (HS4 with its offset bowl can stave the car of fuel on EXTREME corners) I'd stick with HS4 carb.

of course fitting a simple plastic fuel filter would avoid any need to open anything up in the first place.....

[Retro_10s]

Has anyone opened an HIf38 up and looked inside one to compare it to an HS4?

The body is a MUCH better casting than the HS4 - the inside is machined MUCH better than the HS4's, the mating surfaces are tonnes more accurate. There is an extra bearing inside the HIF38 dashpot to help with piston movement and lifespan of the part, The float bowl (as mentioned) is inside the carb rather than on the outside which supplies a more reliable flow of fuel, The bridge and jet top is - again - machined to a much finer standard than the HS4. The throttle return springs are stiffer helping with that pesky lazy throttle that worn out old Hs4's suffer from.

All HIf38's are a Newer, more efficient, and of a higher quality than HS4's. Nothing essentially 'wrong' with the Hs4, they're simple and reliable - but most are now worn, and the cost of buying a worn out Hs4+refurb kit comes to the same as a Good HIF38 that is newer and comes with a naturally higher quality of build and peformance/efficiency.

Either way, it's a case of keeping your carb well maintained and looked after. Whichever you go for *cough* reece fish carb thankyou please *cough*

[SamboMiNi]

How can i tell which carb i have?

[lrostoke]

HIF = no float bowl on the side

HS = float bowl on the side

[AVV IT]

How can i tell which carb i have?

Read this and learn......... http://www.theminifo...0