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Post by Phil Nottingham on Dec 10, 2015 19:00:39 GMT
Wadhams - unleaded
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Post by stantondavies on Dec 13, 2015 16:13:44 GMT
........................If it were mine I'd keep the exhaust seats on the wide side to assist heat dissipation. Take your time and don't rush it and it'll work out for you. Don't forget the stem seals! Thanks for a very useful post; I have ordered a new set of valves from JRW. Just one query: I didn't think there were stem seals on the exhaust valves. Were you perhaps thinking of the V8 when you wrote the reminder?
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Post by Phil Nottingham on Dec 13, 2015 17:27:09 GMT
No seals on IOE exhaust valves and inlet ones are very poor!
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Post by enigmas on Dec 13, 2015 20:19:23 GMT
No I wasn't Stanton, I was referring to the inlet side...the O rings. A good cyl head shop can also machine the top of the valve guides to take modern hat seals. The inlet side is subject to high vacuum on closed throttle. Unfortunately on an IOE engine the exhaust guides are in the block so machining these is more complicated and probably inaccessible whilst in situ. (On a V8 the process is straight forward and well worth doing)
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Post by stantondavies on Dec 13, 2015 23:28:32 GMT
I have renewed the inlet valve stems seals when I rebuilt the head.
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Post by enigmas on Dec 14, 2015 0:28:19 GMT
Well, you're in business then Stanton. Is it a big deal for you to check the rocker ends on the exhaust side for correct radius? If they're burred or ridged they won't rotate the valves. The rockers tips are usually setup to act on the valve stem slightly off centre...this enables valve rotation. The ends can be corrected with a linishing belt or using a belt sander held upside down in a vice. Arc the rocker end in the section between the drive pulley and the flat plate the belt runs on. This is an unsupported section where the belt will deflect downwards allowing a radius to be formed under pressure. It would also be worthwhile checking the inlet valve rockers whilst the head is off. As an aside, a smooth radius on the rocker tip also enables it to move smoothly across the face of the valve tip as it at first depresses the valve then controls its return. This is due to the 'arced' sliding action of the rocker tip as it lifts and closes the valve.
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