| [ Total Views: 2599 | Total Replies: 16 | Thread Id: 45673 ] |
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 rozrob
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| posted on November 7th, 2005 at 10:01 AM |
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unleaded quiery
ok this has probably been asked before but i'll ask anyway. what do i have to do to get my kombi running on unleaded fuel without adding the
additive? is it a matter of getting hardened valve seats put into the heads? the reason i ask is because it looks like i'll have to get my heads
rebuilt in the near future would like to get it converted to unleaded if it aint to exey.:beer
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akean1
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| posted on November 7th, 2005 at 10:21 AM |
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http://forums.aussieveedubbers.com/viewthread.php?tid=42331&page=1#pid392691 check this thread, no need to change.
and another http://forums.aussieveedubbers.com/viewthread.php?tid=41417&page=1#pid382216
[ Edited on 7-11-2005 by akean1 ]
and another :thumb http://forums.aussieveedubbers.com/viewthread.php?tid=38983&page=1#pid354844
[ Edited on 7-11-2005 by akean1 ]
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PrettyBlueBug
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| posted on November 7th, 2005 at 10:34 AM |
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I took my Beetle to my mechanic on Friday last week because she's been running a bit ragged on idle and lacking a bit of power.... and I was told to
stop putting the additive into my fuel tank! They don't need it. I filled up this morning without it, so will see how she goes! Apparently it can
build up with a gel-like substance and cause probs in the carby, fuel filter, etc.
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Purple Martin
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| posted on November 7th, 2005 at 03:42 PM |
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vw heads don't need the seats hardened, they are already hard! Therefore they can run on unleaded without any additive.
I've heard that the additive makes the heads run a bit cooler, which seems to me to be a good thing in an air-cooled motor with a reputation for
valve troubles.
1959 red & white Beetle
1975 Kombi camper
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Secoh
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| posted on November 7th, 2005 at 09:54 PM |
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if it pings then use premium and retune it to that. That's all you have to worry about with unleaded and air cooled VW's.
If it aint broke,
Make it go faster!!  |
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Kombi Dad
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| posted on November 8th, 2005 at 08:15 PM |
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I find it strange then that Stan Pobjoy still recommends Flashlube in the 1380 that he built for my '63 single cab.
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 Bizarre
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| posted on November 8th, 2005 at 08:39 PM |
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Different people have different opinions
Personally i just use 95 Octane
Have been for a long time.
Others swear by Flashlube.
I think this is slightly different from Lead Replacement Petrol. (LRP). Flashlube is a upper head lubricant as opposed to thehard/spft valve
seats.
I think it is unanimous the LRP is crap.
If you feel better using Flashlube then use it
Futue te ipsum!!!
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rozrob
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| posted on November 14th, 2005 at 11:05 AM |
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well i think i'll just keep using that additive, might fork out that extra couple of cents for premium. I have tried a few different
aproaches,travelled most of the way round australia without any additives at all on unleaded with no short term effects. and a little while back even
tried using 2 stroke oil. the only reason i am a little concerned now is i got her compression tested the other day and the engine is not in great
shape. it goes like this cylinder 1) 100% 2)70% 3)75% 4)70%. so can't help thinking something caused ecesive wear on the engine.
Then again could be all the km's we've done in hot conditions. or a bit of neglect on my part.
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tom_1973
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| posted on November 16th, 2005 at 02:22 PM |
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| Quote: | Originally
posted by rozrob
ok this has probably been asked before but i'll ask anyway. what do i have to do to get my kombi running on unleaded fuel without adding the
additive? is it a matter of getting hardened valve seats put into the heads? the reason i ask is because it looks like i'll have to get my heads
rebuilt in the near future would like to get it converted to unleaded if it aint to exey.:beer
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Apparently there are "stellite" valves available these days which are more appropriate (harder) for unleaded fuel but I've accumulated a variety of
opinions on the issue - including the Muir section and the consensus seems to be that the valves themselves don't need to be any harder.
The key issue is the octane level. The octane level of the old 'super' or leaded fuel was high - 90+. High octane leves prevent pre-ignition in the
cylinders. Pre-ignition causes a pinging sound and is harmful to the engine. Lead was used partly to increase the octane level and partly to lubricate
valve seats.
If VW valves are hard enough to not worry about the lubrication bit, then we simply need to deal with octane levels: ie. use premium unleaded which
has a much higher octane level. This can also be solved by changing the compression of your engine - ideally done at the same time as your valve job.
If the compression is lowered then you can use regular unleaded. This basically involves adjusting the length the pistons travel within the
cylinders.
Personally, I'm interested in raising the compression, and staying with premium u/l for more power and a cleaner burn ... but it's a question of
economy too. |
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tom_1973
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| posted on November 16th, 2005 at 02:26 PM |
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| Quote: | Originally
posted by rozrob
it looks like i'll have to get my heads rebuilt in the near future would like to get it converted to unleaded if it aint to exey.:beer
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btw - i got a couple of quotes on having the compression changed and it varied from $500 for a straight compression change (good mechanic) to about
$1500 for a conversion to stellite valves and compression change (from someone who has since turned out to be really dodgy).
nonetheless, if that's what you decide to do then there are the figures i have. Personally, I'd just use premium and keep searching for an answer
about whether flashlube really does help or not. Muir believes that it only creates more pollution ... |
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 helbus
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| posted on November 16th, 2005 at 02:28 PM |
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We have run our Beetle on 91 unleaded for two years with no additive and no change in motor running
The Bus was run for about 5 years on Optimax and no additive with no problems.
And well duh we just run it on 95 unleaded with the Suby motor now, but I know that;s different.
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cab1303
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| posted on November 17th, 2005 at 12:07 AM |
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I have been running unleaded 95 since it came out but before then i was using optimax, and i have had no problems also adding an additive every 3rd or
4th fill. Does anyone else use unleaded 95 over optimax.
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Bizarre
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| posted on November 17th, 2005 at 06:50 AM |
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| Quote: | Originally
posted by cab1303
Does anyone else use unleaded 95 over optimax.
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yep :thumb
Futue te ipsum!!!
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PrettyBlueBug
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| posted on November 17th, 2005 at 07:32 AM |
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I mostly use Unleaded 95 in my Bug... was using Optimax, though every now and then I'll use it. I don't use any additives now. 
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Che Castro
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| posted on November 17th, 2005 at 08:25 AM |
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been running it on premium for the last 10,000 miles on a rebuilt engine. no problems with valves.
Jon
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helbus
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| posted on November 17th, 2005 at 12:05 PM |
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| Quote: | Originally
posted by cab1303
Does anyone else use unleaded 95 over optimax.
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We only use 95 in all our cars and bikes, except the KOC Beetle which is a little slut and only deserves 91 because it only runs on 3 1/2 cylinders.
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PrettyBlueBug
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| posted on November 17th, 2005 at 12:08 PM |
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| Quote: | Originally
posted by Helbus
| Quote: | Originally
posted by cab1303
Does anyone else use unleaded 95 over optimax.
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We only use 95 in all our cars and bikes, except the KOC Beetle which is a little slut and only deserves 91 because it only runs on 3 1/2 cylinders.
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Hahahaha poor thing.... :P
My 2nd car was a 1983 Ford Laser.... for a few months it was running on 1.5 cylinders, no idea how. :P
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