Page 2 of 2
Re: Kick starting poor compression
Posted: Sun Sep 11, 2016 8:03 pm
by Chris in Margate
Anything over 100 PSI is fine. Mine has been 105 for 2 years. Again, only an indicator.
Re: Kick starting poor compression
Posted: Sun Sep 11, 2016 9:55 pm
by Scooterdude
Chris in Margate wrote:Anything over 100 PSI is fine. Mine has been 105 for 2 years. Again, only an indicator.
of course gauges can vary considerably, mines a gunson from way back in the 70s so could be considerably out. As you say only an indicator.
Re: Kick starting poor compression
Posted: Mon Sep 12, 2016 8:57 am
by kennystag
Hi Mate,
80 PSI is plenty to start your engine, so do not panic. Probably stuck rings. Try bump starting it.
Cheers
Stag
Re: Kick starting poor compression
Posted: Mon Sep 12, 2016 9:44 am
by Chip Panfire
Thanks again for all the input and welcome to the forum Kenny.
Will try a push start next time I'm at the workshop.
Re: Kick starting poor compression
Posted: Mon Sep 12, 2016 11:35 am
by EddieStone
I built an engine recently that was right bu99er to start. Eventually noticed how little compression there was when I noticed I could turn the flywheel by hand easily. Stripped it down and found I'd used the wrong piston and it was about 3 oversizes too small!
Re: Kick starting poor compression
Posted: Tue Sep 13, 2016 7:25 am
by kennystag
Thanks for the welcome Chip Panfire, and good luck with your lammy.
Cheers
Stag
Re: Kick starting poor compression
Posted: Thu Sep 22, 2016 7:54 am
by johnduke
Hi , my 175 conversion pinks like mad at 45mph plus . Timings set 16 degrees just checked with compression tester 175psi
. squishe is only .85 so will add .5 to base or head (dont run ahead gasket at the moment). Think that i will have to remove metal from combustion chamber as well as gasket. As well as pinking i dont think kick start will last too long with this much compression . Dont want to remove engine to check head volume so what psi should i aim for? thanks John