Originally Posted by
SqueegUK
Hi guys, me again. Seems like the temps on the temp gun I mentioned before were way out, if anything I was still a little too rich.
I had my first race today with my Hyper ST and Go 21 5 port, was awesome.
I had a nightmare of a final though. Engine died one the start line and then proceeded to be hard to start and then died everytime the revs got too low. When starting it would start, run for about 10 seconds and then die, no matter whether I had the throttle half, full or at idle?????
What could cause this?
It ran faultlessly otherwise during the qualifiers and temped at the end of each of those at around 240F with the ambient around the 65F to 70F mark
During the final I had to change the brand new plug I had put in before the 4 5 minute qualifiers with a new one to get it to run properly.
There is still good smoke to the point that it runs stupid rich when cold and the top of the piston and the roof of the button is really black, which I was told was good????
Why is it behaving this way and chewing up glow plugs like that? The glow plug I removed still works, but not all the way up the filament. I have used 3 glow plugs since last nights practise which I managed about 4 tanks only.
Just to recap, it is a Go 21 5 port (07 spec) running Mccoy MC-9 and Byron's 25% Gen 2. The engine has a little over 2 gallons now and still has really really good compression.
having the top of the piston completly black is not always good, this is a sure sign of running to rich, and all the build up just sticks to the top. when it is tuned right on the LSN the top will have a dark brown shade from the center of the piston towards the exaust, this area will have this color, also what shims are you running, correcting the squish can also correct this.