Planet Minis

tormentandglory · 10-29-2008, 05:33 AM

Hi guys, I've been building a gpx150 with a TB V2 165 kit and I was just wondering if anyone could offer any input regarding compression ratio. I've cc'ed the engine and if I assemble it with a 0.75mm squish clearance, I'll end up with 10.6:1 comp.

I think thats a bit lower than what they usually go together at. I've reshaped the chamber slightly so the valves aren't shrouded and I've modified the piston slighty so there is no shrouding around the dome. I really should have measured it all before I started work on it.

I've never played with mini engines over 140cc and I'm not sure how high I can safely go with compression in this thing. I'll be using it on the road in a street legal z50.

How high are you guys going before you run into problems?

10-29-2008, 05:33 AM	#1 (permalink)
tormentandglory PM Newbie Join Date: Jun 2008 Location: melbourne, australia Posts: 47	Any recommendations for compression ratio on a V2 165? Hi guys, I've been building a gpx150 with a TB V2 165 kit and I was just wondering if anyone could offer any input regarding compression ratio. I've cc'ed the engine and if I assemble it with a 0.75mm squish clearance, I'll end up with 10.6:1 comp. I think thats a bit lower than what they usually go together at. I've reshaped the chamber slightly so the valves aren't shrouded and I've modified the piston slighty so there is no shrouding around the dome. I really should have measured it all before I started work on it. I've never played with mini engines over 140cc and I'm not sure how high I can safely go with compression in this thing. I'll be using it on the road in a street legal z50. How high are you guys going before you run into problems?

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