Rolls-Royce Silver Shadow II - Page 43

Q
Service
Bulletin
Bulletin number
Circulation list
Category C
N ON -AV.\ ILA BIL IT Y OF 100 (Rcrn OC r.!'A !'iE FU.SL
APPL IC A?LB TO:
Al l Rol ls -Roy ce a~ d Bent le y C ars .
IN ';:'RODU C'II O:~
ID) O LL S·
rf-\\ OY CE
.'v~ O TORS
Car Division
T SD t.171
1 00 (RON) Oct ane Fuel (know~ in th e Un it e 6 Kin g do ~ as Fiv e Star r~ cl )
is becc r'.;i ng ir.c rea si r.gly c:i ff icult to obt c.i !l. 97 ( RO::;) O cl:a r~o F ue J.
is avail a ble in most territories and cur~ e nt ~~ g ines with 8 :1 c om-
pression rati os have been ~ esi gn ed t n c op 0 with these lrn 1er oc tane
fu e ls. T his bu llet i n ha s been is ;:;u ed to d-2 sc~ :i.be th e pro ced -.i~ c. ',:~,_ j_c !. ~
sh ou l~ be ad opte d to en abl2 ea rl i2r ensincs to run sat is f ~c tcri l y ~~
these l o wer o ctane fuels.
DESC::.:ZlP'l'IQ!;
9: 1 compression r ati o e n gines wi l l norrr, c.l ly r t~ n ~a-::. :~ sfact o ril y C !'..
97 to 99 Oc tane Fu el an~ th e ign iti on ti ming on th2 a bo ve ca rs
sh o uld the re fore b e set to th e st an d~ =e sett in g.
There is the possibility, dep End ~nt ~pon op erat i ng ~onditi o ns a~~
the gen era l condition 0£ th e eng ine, that detonat ion ma y ccc ur.
Detonati on i s ?. co ndi tio :'."l s:,,,,hich manifests itself as a "ti ;1.kl ir_ -3"
noise from th e engine un~er c o nditi o ns of hea vy load at medu in en ; l.ne
sp ee ds. In the ev ent of a co rr-.pl a.in t of c"?et onc1 t :.. c n, th e f oll c-"1 11~ .;-
pr oc ecu re sh ould be adopted .
PR OCE DURE
1. Set th e igni ti on tim ing to the st andard se tti ng.
2. Det erm in e whether or not det onat io n i s evident, by ac cele r c~ting
the ca r up a steep incline in top gear with9ut eligaging kick-
aown. Det o nati on will usu a lly oc cur at e ngine speeds be twe en
2,0 00 and 3, 00 0 rpm.