fuel requirements for 575 sci 's
#3
Registered
Join Date: Jan 2003
Location: Stafford Va.
Posts: 2,806
Likes: 0
Received 0 Likes
on
0 Posts
I know on the newer SC 600 and 700 you can put the crap 87-89 in them and it will nock/ping and pull the timming back and HP but you can run it but I don't know if the computer on the 575 is good enough to not do harm on the 91 or higher fuel. It's not on their web site ?
#4
Airking
VIP Member
Join Date: Aug 2004
Location: Stafford Va.
Posts: 452
Likes: 0
Received 0 Likes
on
0 Posts
Fuel Type - Unleaded Premium - Minimum Posted Octane 91
(r+m)/2 or 96 RON * Mercury Racing does not recommend gasolines containing alcohol ---This imfo came from my Mercury Racing #8 575SCI Service Manual. I have been using 92 with 10% ethanol for several years now with no ill effects yet. I would never run fuel less than 91 octane except if nothing else is avalible, then only enough to run home using no boost and minimum RPM. Using less than 91 octane can reduse the block and heads to junk along with waiting too long to change the head gaskets. I have seen this twice now in the last 2 years on my friends boats.
(r+m)/2 or 96 RON * Mercury Racing does not recommend gasolines containing alcohol ---This imfo came from my Mercury Racing #8 575SCI Service Manual. I have been using 92 with 10% ethanol for several years now with no ill effects yet. I would never run fuel less than 91 octane except if nothing else is avalible, then only enough to run home using no boost and minimum RPM. Using less than 91 octane can reduse the block and heads to junk along with waiting too long to change the head gaskets. I have seen this twice now in the last 2 years on my friends boats.
#7
Charter Member #1171
Charter Member
how about a 10.5:1 motor !!!!???
__________________
I want to live in a world where a chicken can cross the road and not have its motives questioned.
I want to live in a world where a chicken can cross the road and not have its motives questioned.