KH pipes

[Simon.Gardiner]

Pic of pipes on my FH - note how tight they are to the bottom of the timing chest compared to Will's pic of his KHA.
(Not that this means much - the 650 timing chest might be much lower than the 500...)

Bernie - should you need something to refer to (and if you've not got it already) there's an Ariel factory doc on setting up a sidecar for the swing-arm frame in the Doc Repository under 'Technical Papers'.

SG

[Bernie Blundell]

Cheers Simon, found the sidecar mounting document, wonder how close the FH pies are to the KH, also wonder about BSA A7.

[will_curry]

BSA pipes push into the head rather than fitting over stubs.

I've not been able to measure things properly yet but a quick look
suggests that the stubs on an FH head are slightly further apart than
those on a KH head and that the inter-stub angle is lightly bigger on
an FH. Hopefully on Saturday I'll be able to get measuring . . .

[Roger Gwynn]

We have drawings for both ex pipes.
The angle of splay from the c/l is 20 for KH and 30 for FH.
Distance from ex stub to bottom run of pipe is KH 13-9/16 FH 14-1/2
Ex ports are the same diameter
The drawing should show that they are close but would take a large a hammer to make them fit.

KH-FH ex pipe.docx

(19.96 KiB) Downloaded 61 times

[Simon.Gardiner]

That much difference in port angle might be tricky to deal with (from experience of trying to get a Triumph pipe to fit my old NH many moons ago).
Somewhere I've got a KH head, I'll see if I can find it over the weekend and compare directly with my spare FH head (and also have a good look at the mis-fit on my FH pipes but I don't think the port angle itself can be as much as 10 degrees out).

SG

[Bernie Blundell]

Many thanks gentlemen, very much food for thought there

[nevhunter]

Best if someone can show an original which I believe has a quick kink in it right near the Port.. Not easy to replicate. Nev

[Roger Gwynn]

Nev, I think you are thinking of the plunger/rigid pipes that changed in style about 1950 I think when they added the kink you mention, before then they were more of a flowing line. I may have them round the wrong way, I cannot remember and have not checked it out.

[paul.jameson]

In the interests of being (un)helpful, here are photos of 1952 factory pipes replicated by Tony Pegler on his ISDT KHA.

[Bernie Blundell]

Ahhh, that's more helpful than may be obvious Paul, I was wanting to run the silencer on the offside, to get the noise away from the intended 'chair' for 'herself'