Idle is high 13s
Cruise is 13.5 : 14.5
Light accel in the 14s
Wot 11 : 12
Engine was purchased off eBay only done say 20k. I’ve done 5k.
I’m going to get a bore scope and check the cylinders.
It’s a great runner I just think there is something strange about lack of timing and head temps.
Cheers
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The AFR all look fine from here but as mentioned, they are only an average between cylinders so this needs to be kept in perspective.
When you say lack of timing, what is your timing at total? You said 20 initial/ idle, which is fairly high with the level of cylinder pressure/ compression you have.. I run 27 locked but this is with a cam running about 115 degrees of overlap, where as a mild cam will not need anywhere near that level of timing.
I would imagine a good setup with good dynamic comp with mildish cam, say 40/60 or thereabouts to want about 12-16 initial and about 30-32 total. 16- 20 advance in the curve should be close to ok. If your dizzy hasn't been recurved, or not done correctly, then you will find your total timing could be real high. This has happened to me when I had a dizzy recurved- it was suppose to have 10 degrees advance in it- but they actually, mistakenly, put 16 degrees in it- so when I set my timing at 20 degrees I was actually running 36ish total, which was WAY too much for my engine.
If I were you I would check all the basics, confirm TDC, confirm advance actually in the dizzy.
BTW there is a reasonably good octane boost called OCTANIUM- its from VP fuels and can genuinely add quite a lot of octane to your fuel if needed. Might be worth a try.. from memory it was $27 per can when I bought it. Half a bottle will turn 40 litres of 98 into 102 octane. Just be mindful that its not safe for 02 sensors in high concentration (dont use a full can if you plan on running your 02 sensor).
Also, what induction you running? Do all 6 plugs look the same when pulled?
Edited by LC-GTR-1969, 19 March 2018 - 03:05 PM.