Woohoo...passed a NSW blue slip...but.....

phantom Wolfsburg Wizard

598 posts · joined Mar 2004 · 13 Jul 2004, 9:02 pm

#202683

After much work my 69 bug passed its blue slip today. thank god.

However the mechanic told me there was a lot of 'knocking at high revs' in the engine. When I told him I won't be hitting the highways a lot he said that was OK, but....

Can someone explain the problem to me (ie what is knocking, etc?), what it means, and how does that reflect the leftover life in the engine? I know to fix it would be pulling the engine, but is it a major repair? Thanks,.....

www.canberravw.com

PurpleT3 Fahrvergnugen

880 posts · joined Apr 2003 · 14 Jul 2004, 8:58 am

#202798

Knock or pinging is early detonation of the fuel in the cylinder ie the fuel explodes before the spark fires instead of burning. Knocking will severely reduce the life expectancy of the engine.

It does not necessarily require any disassembly of the engine. Knocking can be caused by several factors:
1)Using fuel with too low an octane rating for the compression ratio of the engine. Search the forum for posts on fuel for all the info on what people use, there are lots of them.
2)The timing is too advanced. Check that the timing is set correctly.
3)Overheating. If the engine is running hot pinging is more likely to occur. Check that all the tinware is in place and properly sealed up, even little things like the rubber boots over the spark plugs can make a difference. Make sure the fan is running properly.
4)Sticking valves. This is the only one which requires any disassembly of the engine and obviously requires removal of the heads. This is the last resort if the first three all check out OK.

So it is not necessarily a major repair. If you want the engine to last longer, I would get it fixed. Remember, you don't only hit high revs on the freeway but also driving around town so you will probably notice the knocking as you drive. Get your mechanic to do full tune up and service if they haven't already.

Ain't nothin' like the wind in your hair.

barls Administrator Causer of Chaos and Mayhem

9,473 posts · joined Jun 2004 · 14 Jul 2004, 9:03 am

#202804

you want to get this before it does too much damage to the pistons and causes a blow by. cause this what i had happen to me with my 1700:duh

“We all pay for life with death, so everything in between should be free.” Bill Hicks
the chaos project - click me

vw54 Administrator Always Waiting 4 Friday

16,723 posts · joined Aug 2002 · 14 Jul 2004, 9:12 am

#202810

TRy using shell Optimax... and dont flog the guts out of the engine on hills.

I read it on FACEBOOK so it must be true

http://forums.aussieveedubbers.com/viewtopic.php?tid=91278&page=1#pid848630

http://forums.aussieveedubbers.com/viewtopic.php?tid=63561&page=1#pid624099

http://forums.aussieveedubbers.com/viewtopic.php?tid=4832&page=1#pid452603

http://forums.aussieveedubbers.com/viewtopic.php?tid=60650&page=1#pid574409

barls Administrator Causer of Chaos and Mayhem

9,473 posts · joined Jun 2004 · 14 Jul 2004, 9:29 am

#202812

bp ultimate works as well ether of these two is what i run my dub on

“We all pay for life with death, so everything in between should be free.” Bill Hicks
the chaos project - click me

BiX Veteran Volks Folk

2,499 posts · joined Sep 2002 · 14 Jul 2004, 10:41 am

#202839

knocking could also mean something like a knwocking noise, ant may be due to bearings going etc

I have no sympathy for my car, only the wallet that pays for it!
Go hard or go home!!!!