Which fuel? Options

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Guest		#1 Posted : Wednesday, 21 March 2007 5:30:18 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		What's the best fuel to use in a 308 with a mild cam? And what's the best lead replacement additive? Cheers

Guest		#2 Posted : Wednesday, 21 March 2007 9:11:04 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		Hi Timbo, The best fuel to use depends more on your compression ratio, ignition timing and the amount of carbon inside the cylinders than it does on what cam you have in the car. Generally, PULP (95/96 Octane) or better will give you the best result

ozjason		#3 Posted : Wednesday, 21 March 2007 10:02:57 PM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 29/06/2005(UTC) Posts: 287		I pretty much agree with Qute on this one. One extra point, though... if you do decide to use an additive, then buy it in 1L containers (or larger) from automotive outlets, don't buy it in those little squirt bottles from servos. You'll save heaps. P
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HK1837		#4 Posted : Thursday, 22 March 2007 12:01:58 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 557 time(s) in 532 post(s)		Agree with Qute on the carbon issue. I run LPG on a stock HZ 308 (9.7:1). Was recently pinging it's head off. I 1/4 filled the flashlube bottle with metho (mixed with upper cylinder lubricant), upped the amount that goes in and give it a hard run up the e
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ozjason		#5 Posted : Thursday, 22 March 2007 12:27:28 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 29/06/2005(UTC) Posts: 287		Bryon, try switching the washer bottle outlet to the intake manifold, so you can give it a squirt by pushing the windscreen wiper button. :-) Jason.
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HK1837		#6 Posted : Thursday, 22 March 2007 3:39:27 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 557 time(s) in 532 post(s)		That's sort of what i'm thinking. But I was thinking of automating it a bit by using a MAP sensor, TPS and rev sensor so that it only works at mid-high throttle openings, reasonable revs and moderate vaccumm ie when the engine is working hard. That's when
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Guest		#7 Posted : Thursday, 22 March 2007 3:58:53 AM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		The reason I ask is because whether I use regular unleaded (91) or premium (98) I seem to get the same mileage out of a tank, if anything I get a bit less on the premium. As for the lubricant, I bought the motor about a year ago with only a few thousan

Guest		#8 Posted : Thursday, 22 March 2007 5:27:27 AM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		As a general rule, it shouldn't be necessary to decoke (to use an old term) a motor after only 15,000 k's. For it to be necessary after such a short time would indicate that something was seriously wrong. Are you adjusting your timing when swapping bet

Guest		#9 Posted : Thursday, 22 March 2007 4:21:38 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		Nah, not adjusting the timing. I'll have to give that a go. I tell ya what, I'd love to have one of you blokes living next door, but you'd need to build a new shed to store all the cartons of beer I'd owe ya.

HK1837		#10 Posted : Thursday, 22 March 2007 6:06:25 PM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,898 Thanks: 1 times Was thanked: 557 time(s) in 532 post(s)		Agree with Qute agin. I want to have it there permanently so I can run a little more timing available for dual fuel and not ping on LPG whilst towing or carrying a load. _______________________________________________________ If we all had the same (g
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Guest		#11 Posted : Thursday, 22 March 2007 9:04:16 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		Higher octane fuels are more stable under high pressure and heat, so may enable you to run more advance and compression. If you are already achieving max performance with a given octane then increasing the octane will not increase mileage or performance.

Guest		#12 Posted : Thursday, 22 March 2007 9:47:04 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		Timbo, where are you? One of us just might be next door to you... Cheers...Dave

Guest		#13 Posted : Friday, 23 March 2007 5:54:01 PM(UTC)
Rank: Guest Groups: Guests Joined: 2/09/2015(UTC) Posts: 43,977 Was thanked: 5 time(s) in 5 post(s)		Haha Qute, actually at the moment I'm living in my panno, so I could go and live next door to anyone. On the northern beaches in Sydney.

jabba		#14 Posted : Saturday, 24 March 2007 12:19:05 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 17/04/2005(UTC) Posts: 465		As mentioned, octane isn't (directly) power, just a measure of resistance to detonation. So a higher octane lets you tune more aggressively than a lower. Having said that, even different brands of fuel can give different results for the same octane. I
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