scouse
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| posted on 21/2/03 at 08:28 AM |
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Valve Grinding
Hi Folks
Just got my head converted to unleaded (Xflow) so do I now need to grind the valves back in? And if I do what does that involve - I've got the paste
and suction thingy, could do with a few tips or other words of wisdom.
Many thanks
Scouse
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Fifer
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| posted on 21/2/03 at 09:02 AM |
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If your head has been converted, i'm surprised that they didnt Lap the valves in after grinding.
However, put a small amount of course paste on the valve seat (or start with fine if your valves are new) and useing the suction thingy as you call it
on the valve face, rotate the shaft of the tool useing the palms of your hands in a sort of "Cave man starting fire" motion, every few seconds,
change the position of the valve in the seat so that you are now lapping the valve on a diferent part of the seat. You may find that a small amount of
WD40 used with the paste assists the effort required when Lapping.
Once you move on to the fine paste, every now and then, stop and wipe the valve face to look at the surface. It should end up with an even smooth
surface all the way round, contacting all of the available valve seat area (at the correct angle if seats and valves have been matched correctly) with
no pit marks or areas that have not been in contact with the seats.
Remember to keep each valve in the same valve position as you ground it when installing the valves in the head and, ensure that all paste is
removed.
I guess that's about it.
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scouse
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| posted on 21/2/03 at 09:50 AM |
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Thanks Fifer,
When I say 'just had my head converted', it was almost a year ago now and it was dropped off as a bare head. Do I grind all 8 valves or would they
have only put new seats in the exhaust valves?
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Fifer
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| posted on 21/2/03 at 09:58 AM |
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You definatly need to Lap all 8 of them. Doesnt matter if they only fitted 4 exhaust or all of them, you must ensure that the valve and valve seat
faces are perfectly Lapped in. You would loose massive amounts of power and have poor starting if this job is not perfect.
cheers
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macspeedy
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| posted on 22/2/03 at 07:39 PM |
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valves
I'm getting a three angle seats cut by an engine builder makes for better flow if you can stretch that bit further..
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scouse
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| posted on 23/2/03 at 09:11 PM |
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Just spent the afternoon grinding in my valves - what a ball ache. Just got to build the engine up now
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theconrodkid
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| posted on 23/2/03 at 09:23 PM |
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if your balls ache your doing it wrong,i normaly use my hands
who cares who wins
pass the pork pies
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locost7-online.com
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| posted on 28/2/03 at 07:47 PM |
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I can do unleaded conversions including head overhaul on xflows
Std £100
3 angle seats blended throat( stage 1 flow) £140
Im a professional engine builder, guarenteed work 6 mts unlimited mileage.
mail me
rallyxtreme@btopenworld.com
Locost Xflow 150bhp injected! Sold :-(
Facebook blog https://www.facebook.com/Johns-Tiger-Avon-Build-814223212056368/
PLEASE NOTE THIS MEMBER IS NOT A TRADER.
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