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Home > Help Needed / General Tech Chat > Valve guide boss...

dan
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Near Lincoln

12th Oct, 2005 at 12:41:45pm

Valve guide boss...

Should it stay or should it go?

Been using the search button and seen a few without, and some mentions of just smoothing it out a bit (already got to this stage)

looking to run 1.5 rockers, 266 md, mg metro head, possibly with s/s valves

anyone got any opinions?

Tom Fenton
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

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TM legend.

Rotherham South Yorkshire

12th Oct, 2005 at 01:15:20pm

I'd say a compromise is needed between leaving some area for heat soak out of the guide itself, and enlarging the throat area.

I'm sure you know that on the turbo motor it is not as critical, especially on the inlet side. The exhaust side probably has more scope for improvement to aid gas flow out of the cyl into the turbo, but on the other hand this side is also a lot hotter, so could benefit from the area to sink the heat into.


On 29th Nov, 2016 madmk1 said:

On 28th Nov, 2016 Rob Gavin said:
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wil_h

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Betwix Harrogate and York

12th Oct, 2005 at 01:36:53pm

Well I've resisted having any 'porting' done to my head, and I haven't had problems making power.

However, this year I am having the bosses removed on inlet and exhaust.

As Tom says, on a turbo motor I reckon more is to be gained from working on the exhaust.

I'm leaving it to Morspeed to decide how much to remove.

Wil

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.

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