| Re: 2017 Winter Upgrade/Update thread |
Subject: Re: 2017 Winter Upgrade/Update thread by rklessdriver on 2016/12/2 20:02:35 Plan is to keep the compression ratio at 13.1 SCR but the new pistons will have a bigger dome on them because I am going to open the quench distance up more with a thicker head gasket as compared to the current configuration. The pistons are going to be a totally different design. Next week I will be at PRI and will be talking to GIBTEC Pistons about what I want to do v/s what they think I get away with doing. My biggest concern is the ring package. Right now I have a .043-1/16-3/16 and I want to go with a .043-.043-3mm. I plan to make some fairly large physical and functional design changes to the piston as well.... I plan to keep the vertical gas ported top ring land but want to do away with the accumulator groove between the top and second ring... that was the point of failure last time with my current Diamond Pistons. I want to use a little shorter wrist pin and use round wire lock retainers v/s the double wound spiro-locks I have now. This will allow me to use a thicker stronger pin at the same weight as current... or move some weight around to the piston if needed. The dome/valve reliefs will be a mirror image of the combustion chamber instead of the generic dome/valve reliefs I have now. Lastly I want to use a piston guided connecting rod.... instead of the traditional crank cheek guided rods. This is a big deal in max effort Naturally Aspirated engines... I want to see if it will work as well in power adder engines too. FYI her is a link to GIBTEC Pistons in case anyone is interested. All of their pistons are billet. We started using them in all our max effort stuff 2yrs ago and they are the best people I have ever worked with in regard to piston/ring design. http://gibtecpistons.com/ The cyl heads are going to be freshened up with new valve springs/retainers/locks. The valve job on the intake is going to be touched up lightly. The exhaust port is going to get some additional work as well as a totally different valve job which will be better suited to my use of nitrous as a power adder. Like wise the combustion chamber is going to have the quench areas hit with a "softening cut", which will help widen my tuning window with the bigger doses of nitrous to come in 2017. I am going to run the current camshaft at least another year. It was designed for a little more power than I am making now and I need a common point of reference with all the changes to the cyl heads and induction system we made this year and next year. I am really excited for next season. I think these changes I am making to the engine are going to be worth a surprising amount of power.... That extra power with the changes to the chassis should really make the car much, much faster. You will have to come out to the track with me again. Will |
