TheSamba.com :: View topic - VW buggy, engine runs not so good. PLEASE HELP!!

Tue Jan 07, 2014 8:24 am

Hi,
I made a buggy, but the engine does not work 100% good, I've tried many things, such as capacitors, new carb, ... but nothing helped. Have you an idea what the cause is?

Sorry for bad English.

Tue Jan 07, 2014 12:23 pm

It sounds like its not running on all cylinders. I would start with a compression test.

Tue Jan 07, 2014 1:18 pm

I agree that it doesn't look like it is running on all cylinders. Instead of doing a compression check just make sure the exhaust is getting hot where it comes out of each cylinder.

Tue Jan 07, 2014 3:13 pm

Does it by chance have a pertronics or a magnetic breaker setup?

Tue Jan 07, 2014 5:13 pm

re-check valve lash

Wed Jan 08, 2014 6:00 am

As far as I know, the compression is everywhere around 6 kg, we will once again arrange everything from inflammation to valve control. But is there anyone who know how long it should take to the choke valve is fully open? because this can also be set.

Wed Jan 08, 2014 7:47 am

pull each wire while running, check for spark
take new carb apart, check orifices, clean
Then check all that other shit

Wed Jan 08, 2014 11:04 am

Is it possible that the piston segments are worn out?

Wed Jan 08, 2014 12:27 pm

Piston rings?
Ya they could be worn out. That's why I suggested compression test, or do a leak down check.

Thu Jan 09, 2014 1:40 am

yes, piston rings is what I mean.
I have the compression test performed, and on every cylinder is a pressure of 6 kg. Is that enough?

Thu Jan 09, 2014 6:08 am

If 6kg is the same as 85psi I'd say it's worn out. Normally I look for a value over 100psi and equal across all cylinders.

These are all simple questions that would be best answered with a quick google search:
'what is good compression for a engine'
http://www.dummies.com/how-to/content/how-to-check-an-engines-cylinder-compression.html