New Valves
Turbo Mini Forums

Hi guys hope you can help.

I've stripped the head right down & need to purchase new valves & guides, who do you recommend to purchase them from???

Also what grade material for each, 21NS stainless Valves, what Dia & matching bronze guides?

Do i need to fit new valve seats?

Great site & many thanks.

You will need to recut the valve seats if fitting new guides. If the valve seats are quite worn you could install a larger valve to help reclaim the seat.
What is the head used for & what is the current spec ? This will dictate whether you need to go to the extent of the stainless valves & bronze guides.

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Head is currently a standard turbo head, stripped it down this afternoon & found a bit of wear in the guides.
I'm in the very early stages of a 1293 fast road build, what do you recommend for valve sizes??

I run a machine shop so cutting new seats, fitting guides, skimming & porting is no problem, will be making my own mainfold to take a T2 turbo when i can source one.

My heads at work, can you tell me the distance between centres of the valves (Before any offset) in each chamber & are all 4 pairs the same???, I'm looking into CNC milling the chambers & need to cad the profile to work out the cc.

For a basic fast road head I'd put a larger 35.7mm inlet in, the standard ex size can be retained if the seats useable. All valve spacings are equal as accurate as they were machined by BL ...

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Do you know what that spacing is??? if not I'll have to wait till Monday.

Valve seat looks ok but can I cut 3 angles on a standard seat or will i need to go bigger?

thanks for your help Phil.

Edited by Myamini on 16th Jul, 2010.

I don't know offhand sorry. It's difficult to get a proper 3 angle seat on the standard size ex, going to a 30 or 31 will make it possible, but 31mm leaves little between the valves.

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For someone who rums a machine shop you sure do ask questions akin to a complete beginer .

just an observation,.

carl

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Surely this is what the site is for asking questions & getting advice from people like Phil who are far more expericenced than me.

If you want to start talking about down hole oil tool logging & the machinability of inconel 718 then I wont sound like a novice, everyone specializes in a certain field & until I'm better educated I'll ask for what i think is expert advice.

I asked who you purchase the parts from as I've had problems from certain suppliers & a few currently have a bad name.

Head is at work so I cant measure it so asked.

Please dont take any of the above as a moan I'm just trying to explain but it's come across wrong.

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