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Valve Guide Seal


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9 replies to this topic

#1 croc7

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Posted 21 June 2020 - 04:19 AM

All 8 locations or just intake? Some have said the exhaust valve stems need a little lubrication.

#2 Moke Spider

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Posted 21 June 2020 - 06:29 AM

All 8.

 

Oil on the Exhaust Valve stems can burn and so wear the stems & guides, also on the Exhaust Valve Seats will pit them real bad.



#3 imack

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Posted 21 June 2020 - 06:40 AM

All my heads have only ever had them on the intakes.
My latest head from MED only has them on the intakes too.

#4 whistler

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Posted 21 June 2020 - 08:00 AM

As Moke said.



#5 cal844

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Posted 21 June 2020 - 09:03 AM

Fit them on all 8 valves, also make sure you fit the MPI type

#6 Turbo Phil

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Posted 21 June 2020 - 09:19 AM

For anything Road going fit 8, for anything boosted or high output NA I only fit them on the inlets.

Phil.

#7 Ethel

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Posted 21 June 2020 - 03:26 PM

What's the reasoning with boost, Phil?



#8 andyapanel

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Posted 21 June 2020 - 04:05 PM

I use the uprated Minispares ones on all 8, but only because I take all the valves out when I decoke a head.

I understand the argument for only doing the inlets, but if you have got that far stripping the head, what the hell, they can't do any harm.



#9 Turbo Phil

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Posted 21 June 2020 - 09:31 PM

What's the reasoning with boost, Phil?


Temperature, the exhaust valves need all the lubrication they can get.

Phil.

#10 Ethel

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Posted 22 June 2020 - 07:24 AM

I wonder how much oil pressure differentials will allow when you're on boost? Though there could be all sorts of Bernoulli weirdness going on too.  






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