f7ben Posted January 26, 2018 Share Posted January 26, 2018 Ok , added a base gasket and bolted her back together. Just measured combustion chamber volume again and its 27.6cc . This gives me a trapped comp ratio of 6.6 to 1 and a static ration of 12.1 to 1 This should live 87 octane if it had to but I will run 91 in it for added safety Quote Link to comment Share on other sites More sharing options...
Rod Posted January 26, 2018 Author Share Posted January 26, 2018 Just get a bottle of torco octane boost and keep It in the seat. Then you’re always good Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 1 minute ago, Rod Johnson said: Just get a bottle of torco octane boost and keep It in the seat. Then you’re always good I will do just that. I am much happier with these compression ratio's .......now I need to hope I didnt make the motor too peaky raising the port timing like I did Quote Link to comment Share on other sites More sharing options...
Rod Posted January 26, 2018 Author Share Posted January 26, 2018 29 minutes ago, f7ben said: I will do just that. I am much happier with these compression ratio's .......now I need to hope I didnt make the motor too peaky raising the port timing like I did It’s a 1000... it’ll be fine. Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 1 minute ago, Rod Johnson said: It’s a 1000... it’ll be fine. I think so too but I havent found anyone that have tried this with the stock 1000 cylinders. Quote Link to comment Share on other sites More sharing options...
Rod Posted January 26, 2018 Author Share Posted January 26, 2018 1 minute ago, f7ben said: I think so too but I havent found anyone that have tried this with the stock 1000 cylinders. If you aren’t competitively racing I doubt you’ll notice the difference as long as your port timing and pipes aren’t a huge mismatch Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 Just now, Rod Johnson said: If you aren’t competitively racing I doubt you’ll notice the difference as long as your port timing and pipes aren’t a huge mismatch thats my concern....stock pipes and higher port timing Quote Link to comment Share on other sites More sharing options...
Rod Posted January 26, 2018 Author Share Posted January 26, 2018 Just now, f7ben said: thats my concern....stock pipes and higher port timing I’ll sale you my D&D trail pipes and buy buddies PSI modblasters then we will both be g2g Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 8 minutes ago, Rod Johnson said: I’ll sale you my D&D trail pipes and buy buddies PSI modblasters then we will both be g2g I'd really love to pick up a set of Simon's CPR pipes but I only found one set and the gave wont budge of $500 for them Quote Link to comment Share on other sites More sharing options...
Frostynuts Posted January 26, 2018 Share Posted January 26, 2018 59 minutes ago, f7ben said: Ok , added a base gasket and bolted her back together. Just measured combustion chamber volume again and its 27.6cc . This gives me a trapped comp ratio of 6.6 to 1 and a static ration of 12.1 to 1 This should live 87 octane if it had to but I will run 91 in it for added safety What kinda compression are you seeing on the compression gauge, once it has been warmed up ? Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 1 minute ago, Frostynuts said: What kinda compression are you seeing on the compression gauge, once it has been warmed up ? Havent checked it warm yet. I got 145 cold...should be high 130's warm Quote Link to comment Share on other sites More sharing options...
Frostynuts Posted January 26, 2018 Share Posted January 26, 2018 (edited) I would think that should be safe enough for 91 octane. Hopefully your pipes aren,t to restrictive. Wonder what XCR1250 thinks of this ? Edited January 26, 2018 by Frostynuts Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 (edited) 2 minutes ago, Frostynuts said: I would think that should be safe enough for 91 octane. Hopefully your pipes aren,t to restrictive. Wonder what XCR1250 thinks of this ? Pipes are stock 1000 pipes and should be more than fine...the cranking compression numbers are pretty useless when determining what octane you need Edited January 26, 2018 by f7ben Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Skidooski Posted January 26, 2018 Platinum Contributing Member Share Posted January 26, 2018 Just out of curiosity what's your Port timing now for exhaust and transfers. Are you still below 200 on the exhaust? Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 3 minutes ago, Skidooski said: Just out of curiosity what's your Port timing now for exhaust and transfers. Are you still below 200 on the exhaust? How do I calculate that.....that is a duration number right? Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Skidooski Posted January 26, 2018 Platinum Contributing Member Share Posted January 26, 2018 26 minutes ago, f7ben said: How do I calculate that.....that is a duration number right? Yes it's measured in degrees starting from Top Dead Center. It's the total time exhaust is open. More exhaust duration means a higher exhaust Port roof and a shorter effective stroke http://www.macdizzy.com/update76.html Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 2 minutes ago, Skidooski said: Yes it's measured in degrees starting from Top Dead Center. It's the total time exhaust is open. More exhaust duration means a higher exhaust Port roof and a shorter effective stroke http://www.macdizzy.com/update76.html Top of exhaust port is 30mm from TDC and the port is 33mm tall .....not sure how to do the rest Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 got it.....duration should be 165.6 Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 Actually 194.4 , I had that backwards Quote Link to comment Share on other sites More sharing options...
Platinum Contributing Member Skidooski Posted January 26, 2018 Platinum Contributing Member Share Posted January 26, 2018 1 minute ago, f7ben said: Actually 194.4 , I had that backwards Below 200 shouldn't be too bad IMO but I I have only worked Rotax triples. Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 26, 2018 Share Posted January 26, 2018 2 minutes ago, Skidooski said: Below 200 shouldn't be too bad IMO but I I have only worked Rotax triples. gotcha Quote Link to comment Share on other sites More sharing options...
Rod Posted January 27, 2018 Author Share Posted January 27, 2018 Triple are the cats tits!! Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 27, 2018 Share Posted January 27, 2018 3 minutes ago, Rod Johnson said: Triple are the cats tits!! you never said what you want for the pipes faggot !!!!!!!!!!!!!!!!111111111111//??????????? Quote Link to comment Share on other sites More sharing options...
Rod Posted January 27, 2018 Author Share Posted January 27, 2018 1 minute ago, f7ben said: you never said what you want for the pipes faggot !!!!!!!!!!!!!!!!111111111111//??????????? I’ll let you know when I hear from buddy on these modblasters Quote Link to comment Share on other sites More sharing options...
f7ben Posted January 27, 2018 Share Posted January 27, 2018 1 minute ago, Rod Johnson said: I’ll let you know when I hear from buddy on these modblasters what rpm do those D&D wanna turn? Quote Link to comment Share on other sites More sharing options...
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