Holy shit mark those videos are crazy! I need to get a 68stg2r and switch to your tuning. Hopefully this summer :thumb:
Fingers Oval Bowl piston sound clips??
- Thread starter The Kansan
- Start date
Holy shit mark those videos are crazy! I need to get a 68stg2r and switch to your tuning. Hopefully this summer :thumb:
Wow that power comes on quick!!! Whats the lowest compression you recommend to run ? I was leaning towards 16.1
Its not a daily driver and i dont tow with it will be running 100 over injectors and a wagler AF cam . dont know the specs on it as of yet need to call on monday to see what options are. More of like a street/ strip truck.
Wish i knew how to read that.... LOL How do you measure head volume?? Feeling dumb... Im running .020 overbore and stock heads.
On the top part you read were Jon says 15.5 to 1 without pockets on cast is his low side he would use.
I see i was looking at the chart and was kinda confused. I see it now. Thanks! I sent you a pm ripmf666
https://www.youtube.com/watch?v=QHjU84o_W8s
This is by far the best sounding example of these pistons in my opinion, lol!!!:happy2:
This is by far the best sounding example of these pistons in my opinion, lol!!!:happy2:
Head volume varies from build to build and is the responsibility of the builder. As shown in the chart. Typical, non-piston volume is about 13cc and is what was used to calculate the various compression ratios.
If the builder recesses the valves, uses thicker gaskets or a slew of other things, it will affect the final compression ratio.
The limit on the cast compression ratio is structural. There isn't anywhere to remove material without compromising piston integrity. If you add valve pockets to the 15.5 bowls, you can get lower, but you need to talk to me beforehand so I can verify it will work.
Bottom line, the pistons are custom made to the customer's specifications. Unlike some others, I can maintain almost any CR with or without valve reliefs. 18.5:1 with reliefs, no problem.
If the builder recesses the valves, uses thicker gaskets or a slew of other things, it will affect the final compression ratio.
The limit on the cast compression ratio is structural. There isn't anywhere to remove material without compromising piston integrity. If you add valve pockets to the 15.5 bowls, you can get lower, but you need to talk to me beforehand so I can verify it will work.
Bottom line, the pistons are custom made to the customer's specifications. Unlike some others, I can maintain almost any CR with or without valve reliefs. 18.5:1 with reliefs, no problem.
https://vimeo.com/151237163
Here is a good one, pretty much doesn't sound like a Duramax anymore. almost sounds more like a 2 stroke Detroit here. 4" exh no muffler, profab manifolds.
Here is a good one, pretty much doesn't sound like a Duramax anymore. almost sounds more like a 2 stroke Detroit here. 4" exh no muffler, profab manifolds.
Thanks for the info! My heads have already been machined .005 once so i would imagine they will need some work on the valves to have enough clearance? So the thicker the gasket and if the valves are recessed that will lower final compression?
