gingerprince
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| posted on 3/7/08 at 10:16 AM |
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Valve clearances on a 'blade
Hi
Whilst I've got my engine out and half in bits I've measured my valve clearances (I know they can be done in-situ, but whilst I'm
tinkering this is just another tinker I'm doing whilst I'm at it). All exhaust clearances were OK (all measured 0.008, range is
0.007-0.01). All inlets measured 0.004 (range is 0.005 to 0.007).
I'm assuming that given they're all identical that they've just been set wrong (or my feelers are inaccurate?) as they
wouldn't all wear identically would they?
Anyhow, I guess I need to re-shim the inlets, but just wondering what sort of impact this would have had in real terms - 0.001 doesn't sound
like a lot to me but is it in engineering terms?
I guess it would mean that inlets are open for slightly longer than they should be. Would I get less compression because of this? What other
effects? Will I get loads more power when I set them correctly? Will it really make any difference?
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Mr Whippy
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| posted on 3/7/08 at 10:24 AM |
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0.001?
on my vw engines I check by rocking the arm...if it rocks fine no adjustment needed
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02GF74
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| posted on 3/7/08 at 10:41 AM |
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are you measuring them correctly?
feeler guage won't be wrong, if in doubt either measure the leafs or try another.
the valves are made of identical material, do identical things and move as near as make no difference identical number of times - so why should they
not wear identically?
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gingerprince
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| posted on 4/7/08 at 07:58 AM |
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quote:
are you measuring them correctly?
I believe so. First time I've done it but it doesn't look like you can get it wrong if you follow the procedure. Line up timing marks,
confirm that cam is off-lobe, insert feeler, insert larger feeler until snug. On the inlet I can get 0.004 in easily. 0.005 won't go at all.
quote:
feeler guage won't be wrong, if in doubt either measure the leafs or try another.
Guess I could use the 0.004 and 0.001 together?
quote:
the valves are made of identical material, do identical things and move as near as make no difference identical number of times - so why should they
not wear identically?
Since you put it like that, I guess so  Just seemed a bit "too perfect".
So does anyone know what sort of real-world difference that sort of misadjustment would have?
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