Syllabic weight of KW, TY, etc.
PE19/60
A long syllable in PQ, TQ is a syllable that contains (a) a long vowel, (b) a diphthong, (c) a vowel followed by any two (or more) consonants, including ty, hy, kw, hw.
On the other hand:
PE19/65 (ft. 166)
The penult was long and bore the accent when it contained (a) a long vowel, (b) a diphthong, (c) a vowel + any two consonants {other than >> [in pencil]} including originally ty-, q, hw, hy.
The only places of doubt are therefore in cases of ty, q {occas[ionally] hw, hy,} since these are sometimes reductions after accent-fixing of tty, kkw. The inflexional pronouns -tye, -qe are short. So kàritye, kàriqe.
PE19/88
Whereas initially hy, hw were simple, i.e. short or of normal consonantal duration, medially, being derived from two consonants, they remained long in PQ, and a vowel before them was held to constitute a metrically long syllable. This was sometimes shown by prefixing [= h] to the normal letter. Thus = initial hw [ƕ], = hw medial [ƕ̄]. In TQ the length was reduced.