Re: rt 225 piston choice
Posted: Wed Sep 11, 2019 4:22 pm
Adam_Winstone wrote:^... Hi guys,
Thanks for the replies.
I'm using one of the 72mm pistons (39mm compression height), which I am about to machine the head for, and have noted just how 'out' the AFR head's squish band profile is. Whilst I'm aware that these are not a great match for the standard dome profile, I'm surprised to see just how far out they are!
I machined a few of these previously, always reprofiling the squish to suit whatever piston I've used, but I'm wondering just what I can get away with as the high capacity means that I'll be increasing the combustion chamber volume to deliver the compression ratio that I'm after... and the more I remove to reprofile = the more that I then need to work out of the bowl.
If this is the standard profile piston then there must be a lot of people out there with the profile being a mile out... yet I don't read lots of threads about it, nor hear lots of people talking about running issues.
Cheers,
Adam
How do you go about checking the profile?