Roman Posted November 30, 2022 Share Posted November 30, 2022 True good point! Didnt think about overlap. Quote Link to comment Share on other sites More sharing options...
kpr Posted November 30, 2022 Share Posted November 30, 2022 maybe plausible its avoiding fuel going out the exhaust. orange is rough injection window at 9500rpm. around 4ms. some guesstimation and poor math says would take almost 1ms more to get to intake valve. but that doesn't take into account the intake valve would be shut at the time. and making it out the exhaust valve for that matter It did have a bad day when running at 300 but mostly through the low/midrange. lost all the power. possibly didn't like the fuel hanging around in the intake port, rather than going out exhaust. who knows, maybe majority of the fuel is going through on the overlap and mixes better. Interesting there is something in it though. have tried in the past with smaller cams and didn't do shit so left it locked to 400. 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted December 7, 2022 Share Posted December 7, 2022 @kpr I think the numbers on your otherwise magnificent MSpaint diagram are the wrong way around... So 450 BTDC end of injection means its happening earlier in the cycle not later Quote Link to comment Share on other sites More sharing options...
kpr Posted December 7, 2022 Share Posted December 7, 2022 Ah yes, that was the part i wasn't sure on. out of link manual, should have scrolled down further. kinda makes more sense, kinda doesn't Quote Link to comment Share on other sites More sharing options...
Roman Posted December 10, 2022 Share Posted December 10, 2022 Man this thing sounded awesome! So cool to see it back after a long break from drags, and 13.2 / 105.5mph in those conditions is friggen flying. Well done. 2 Quote Link to comment Share on other sites More sharing options...
rusty360 Posted January 2, 2023 Share Posted January 2, 2023 Bloody hell over 200hp N/A! That's farking awesome man! I need to read back though the thread and YouTube vids but what do ya reckon it would cost to build that engine? Quote Link to comment Share on other sites More sharing options...
kpr Posted January 2, 2023 Share Posted January 2, 2023 Nothing too exotic in the engine itself, other than the vvti setup of course. All off the shelf parts in the bottom end. Head mostly the same. but is a bit of money in getting the bigger valves in there. new seats and stuff. Once start adding all the supporting stuff on guess is going to be pretty spendy. dont really want to add it up haha. If counted the time Ive spent on it, that would be by far the biggest cost 1 1 Quote Link to comment Share on other sites More sharing options...
Roman Posted January 3, 2023 Share Posted January 3, 2023 I know that this is a punishing request, But it would be interesting to see how good the fuel economy can be with your vvti able to go into prius mode! Would be cool to: Drive at 100kph and see what load/rpm you end up at. Go to this load/rpm on the dyno and see how much horsepower is needed for cruising. Then adjust the vvti / ignition timing / air fuel to see how little fuel you can use to acheive this much horsepower. Might be that you can dethrottle the shit out of it by retarding the cam by heaps, so make 30hp at 70% throttle or whatever Will really get some internet people mad if your car gets exceptionally good fuel economy as well, haha. 2 4 Quote Link to comment Share on other sites More sharing options...
kpr Posted January 3, 2023 Share Posted January 3, 2023 I get asked punishing requests every day. just happened to read this before going to fill up at gasser. absolute zero effort to tune any thing for economy. and its borderline tuned properly for cruise atm. but put this here for reference next time is on dyno as i'll forget the numbers. yeah it pulls 4000rpm at 100k. so never going to be prius spec haha. its like a cyclone out, and road wasn't completely flat so somewhere. ran it both ways. probably 8.5% throttle is 100k on dead flat. vvti 40 degrees. so have 40 to go full prius/retard. the dyno hp readout doesn't have enough resolution to do cruise stuff. but using the torque numbers and running in a lower gear to mulitply the torque, for more resolution works well. 1 1 Quote Link to comment Share on other sites More sharing options...
BiTurbo228 Posted January 11, 2023 Share Posted January 11, 2023 Man that's impressive! A mate of mine has a 106 GTi race engine which is a not entirely dissimilar 1.6l, great flowing high revving engine. I thought his one was doing well making 197hp @ 8300 crank (147kw). On the VVT front, I wonder if you knew off the top of your head whether the pulley diameters were the same for the 16v and 20v VVT cams. If it is, then there's a slight chance that I might be able to pinch a 4AGE pulley for my 70s Rover 2600 engine (seems to be the same OD as the 16v 4AGE pulleys). I've been searching around but found a lot of conflicting information, usually regurgitated by people who haven't come across the real versions themselves. Quote Link to comment Share on other sites More sharing options...
kpr Posted January 15, 2023 Share Posted January 15, 2023 sorry just seen this. the cam pulley sizes are the same between 16v and 20v engines. 36 tooth. is the bigger round tooth pitch. i forget the numbers now. I couldn't find much that matched to pitch and tooth count when was hunting for pulleys awhile back. most were 40 tooth. or the smaller pitch 1 Quote Link to comment Share on other sites More sharing options...
Dudley Posted January 15, 2023 Share Posted January 15, 2023 Wadiyatalkinabeet Quote Link to comment Share on other sites More sharing options...
BiTurbo228 Posted August 10, 2023 Share Posted August 10, 2023 Love that your 'midrange' is about 5000-8000rpm 1 Quote Link to comment Share on other sites More sharing options...
kpr Posted August 11, 2023 Share Posted August 11, 2023 Was slightly intimidating pulling 10k after having the 7a in there, that was lucky to do 7500rpm 2 Quote Link to comment Share on other sites More sharing options...
sheepers Posted August 11, 2023 Share Posted August 11, 2023 I am continually blown away by the never ceasing progress you make with half an engine. Great work man, just great. 9 Quote Link to comment Share on other sites More sharing options...
Dudley Posted September 19, 2023 Share Posted September 19, 2023 Pretty good gainz for a crusty old 7age 1 1 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.