7 replies to this topic

[jonnyfawr]

Hi. I've been given a good clean HS6 carb (from a friends TR4).

I'm considering trying it out in place of my existing HS4.

I have the 1.75" manifold spacer and gaskets, fitted additional studs, but am missing the throttle connector.

 

It is obviously different to the HS4 piece, but cannot find anyting about what a single HS6 throttle looks like.

 

Does anyone know what one looks like, and where I might get one...either that or I make one myself

(plenty of twin HS6 kits, but cannot find a single HS6 setup)

 

Also it doesnt have the crankshaft breather connection, that the HS4 does...what do I do with the breather hose????

 

Any general comments on HS6 v HS4 would be appreciated too

 

thanks

Jonny

 

1989 998, stage1 kit, 12g206 head, roller tip rockers.

[BritishRacingGreen]

I don't think you'll find any gains by fitting the HS6 with your spec. The HS4 is a well sized carb for a 998 engine and is easily capable of fueling for your engine. Just out of interest why are you trying to fit a HS6?

[jonnyfawr]

just thought I would try it out...see if it made any difference!

 

Going to refurbish the HS4, and refit it if there is no difference

[BritishRacingGreen]

That's a fair enough reason!

 

You're looking for a HS6 Abutment Plate (there are a few examples if you google it) to mount the throttle cable. The breather could be incorporated into the air filter or inlet manifold, or taken to a 'Catch Can'.

 

You may have trouble finding a needle to run lean enough for the 998, but then I don't know what sort of needles the HS6 uses. They can all be ordered from the Burlen website.

[jpw1275]

I've only worked on twin set ups so is the throttle bit the same as a twin set up where the spring attaches ? If so I may have a spare lurking about

Cheers j

[jonnyfawr]

thanks for your responses guys...

This is what ive found.....looks spot on, except for the throttle spring attachment...but i could drill a small hole myself

[jpw1275]

Ah i see what you mean now..... i was thinking you meant part of the linkage.. cant see why it wouldnt work with a hole for the spring

cheers james

[Yams]

Car might not run too well with a HS6 due to the size on a 998. I tried a HIF44 on mine, very similar size (the Hs6 is just under 0.5mm larger) and it ran awful, felt like it only ran on 2 cylinders under 3k rpm.

Although the 12g206 head is a little larger than other 998 ones, (larger inlet valves and cc) i don't think it would be an ideal set-up. 

 

 

Yams