Guest Posted February 26, 2018 Share Posted February 26, 2018 32 minutes ago, f7ben said: sure...SDI injects somewhere other than directly in the cylinder.....hence why its called SDI Correct so now you agree Polaris CFI is NOT DI it does not inject into the cylinder Quote Link to comment Share on other sites More sharing options...
Kev144 Posted February 26, 2018 Share Posted February 26, 2018 3 minutes ago, HSR said: Correct so now you agree Polaris CFI is NOT DI it does not inject into the cylinder I don't think Ben ever said polaris cfi was direct injection Quote Link to comment Share on other sites More sharing options...
Guest Posted February 26, 2018 Share Posted February 26, 2018 1 minute ago, Kev144 said: I don't think Ben ever said polaris cfi was direct injection Yes your right but he said that CFI Polaris sleds inject fuel into the top of the cylinder which would make it DI,,,, Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 1 minute ago, HSR said: Yes your right but he said that CFI Polaris sleds inject fuel into the top of the cylinder which would make it DI,,,, I quoted from Snowtech magazine that said they did. Quote Link to comment Share on other sites More sharing options...
Guest Posted February 26, 2018 Share Posted February 26, 2018 1 minute ago, f7ben said: I quoted from Snowtech magazine that said they did. Well there's your first mistake lol Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 4 minutes ago, HSR said: Well there's your first mistake lol Cat has injectors on thee CTEC injecting directly into the cylinder bore and it is called a Semi Direct Inject design There is significant confusion in the vernacular surrounding how these systems are defined. Maybe they should be also broken down into HPDI and LPDI Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 Quote Link to comment Share on other sites More sharing options...
Legend Posted February 26, 2018 Share Posted February 26, 2018 (edited) 10 minutes ago, f7ben said: The point is, those injectors are firing into the cylinder. NOT the combustion chamber or top of the cylinder. Which are ABOVE the exhaust ports. BTW if I recall correctly, under certain engine parameters, those injectors ALSO fire under the piston dome. Edited February 26, 2018 by Legend Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 1 minute ago, Legend said: The point is, those injectors are firing into the cylinder. NOT the combustion chamber or top of the cylinder. Which are ABOVE the exhaust ports. Yes and nobody refers to the ctec as DI....in fact its called DSI by cat and we all made a big stink about it being a low pressure system Quote Link to comment Share on other sites More sharing options...
Legend Posted February 26, 2018 Share Posted February 26, 2018 (edited) 2 minutes ago, f7ben said: Yes and nobody refers to the ctec as DI....in fact its called DSI by cat and we all made a big stink about it being a low pressure system I agree. Though I dont give a shit about it being low psi. IMO, I DONT want a DI sled or any gasoline engine for that matter. Edited February 26, 2018 by Legend Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 6 minutes ago, Legend said: I agree. Though I dont give a shit about it being low psi. IMO, I DONT want a DI sled or any gasoline engine for that matter. I'm torn over it....they offer incredible performance ,reliability and efficiency if executed correctly but I love to mod shit and they are near impossible to mod because of the fuel systems. Most times you end up adding aux injectors to supply additional fuel needs from the sounds of it. Quote Link to comment Share on other sites More sharing options...
awful knawful Posted February 26, 2018 Share Posted February 26, 2018 37 minutes ago, HSR said: Yes your right but he said that CFI Polaris sleds inject fuel into the top of the cylinder which would make it DI,,,, And him wrong again.... Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 3 minutes ago, awful knawful said: And him wrong again.... I just quoted an article....I already stated I have little experience with CFI-2 or 4 Quote Link to comment Share on other sites More sharing options...
Legend Posted February 26, 2018 Share Posted February 26, 2018 7 minutes ago, f7ben said: I'm torn over it....they offer incredible performance ,reliability and efficiency if executed correctly but I love to mod shit and they are near impossible to mod because of the fuel systems. Most times you end up adding aux injectors to supply additional fuel needs from the sounds of it. More complex, more weight, more heat, more expensive are cons. More performance? Maybe. More reliable? Not yet they arent. Not saying more unreliable in sleds though either. More efficent? Yeah, I give it that. Im not saying DI is bad. But I dont want it, YET. If a person trades in every 2-3 years, or has dealer do all the maintenence or work, sure no problem. But thats not me. Quote Link to comment Share on other sites More sharing options...
Guest Posted February 26, 2018 Share Posted February 26, 2018 I'm just happy to have argued with Benny and didn't get called fuckface once That's a win in my book Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 1 minute ago, HSR said: I'm just happy to have argued with Benny and didn't get called fuckface once That's a win in my book Legend and Tranzam took all my furry for the day Quote Link to comment Share on other sites More sharing options...
Dave Posted February 26, 2018 Share Posted February 26, 2018 10 minutes ago, HSR said: I'm just happy to have argued with Benny and didn't get called fuckface once That's a win in my book He sent me a pm...and called you fuckface. Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 7 minutes ago, DAVE said: He sent me a pm...and called you fuckface. Quote Link to comment Share on other sites More sharing options...
Legend Posted February 26, 2018 Share Posted February 26, 2018 8 minutes ago, f7ben said: Legend and Tranzam took all my furry for the day Furry? more like you got to the max!!! 1 Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 Honestly.....take a look at where the CFI injectors are....they spray into the transfer passage right below where the port is. Since it is low pressure there is no difference at all between that injector being there or directly in the cylinder. I'm not saying there arent significant fluid and thermal dynamic differences....just that as an overall system it makes little defined difference if they are there or 10mm higher and spraying directly into the cylinder Quote Link to comment Share on other sites More sharing options...
Guest Posted February 26, 2018 Share Posted February 26, 2018 25 minutes ago, DAVE said: He sent me a pm...and called you fuckface. LMFAO Quote Link to comment Share on other sites More sharing options...
Rod Posted February 26, 2018 Author Share Posted February 26, 2018 37 minutes ago, Legend said: More complex, more weight, more heat, more expensive are cons. More performance? Maybe. More reliable? Not yet they arent. Not saying more unreliable in sleds though either. More efficent? Yeah, I give it that. Im not saying DI is bad. But I dont want it, YET. If a person trades in every 2-3 years, or has dealer do all the maintenence or work, sure no problem. But thats not me. DI definitely adds performance on pump fuel. Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 Just now, Rod Johnson said: DI definitely adds performance on pump fuel. there is no doubt....can run more compression and more advanced timing at a leaner A/F and precisely controlled with incredible speed Quote Link to comment Share on other sites More sharing options...
Rod Posted February 26, 2018 Author Share Posted February 26, 2018 1 minute ago, f7ben said: there is no doubt....can run more compression and more advanced timing at a leaner A/F and precisely controlled with incredible speed Guys are getting crazy increases too with E85 on DI NA car engines too. Like 25 rwhp with just a fuel Quote Link to comment Share on other sites More sharing options...
f7ben Posted February 26, 2018 Share Posted February 26, 2018 1 minute ago, Rod Johnson said: Guys are getting crazy increases too with E85 on DI NA car engines too. Like 25 rwhp with just a fuel yup....not all fuel systems have capacity for e85 but with a content sensor you can run e30 or e50 or whatever your system will support and see nice gains Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.