|
Title: 1971ccm Street-Turbo-Typ4 need some ideas Post by: Typ4-Boy on June 09, 2011, 20:27:15 pm Hey,
i`m from germany and just build non-charged engines, but now, i want to go new way for my own. So i want my first turbocharged engine. The last 3week, i read the "turbomania" and learn a lot about this topic. At this time, i build an 1200-stock-engine with an garrett gt15, just to learn, it will be a test-engine... now my idea for my daily-race in the city :D It will be a typ4-engine with -stock crankshaft and pistons/connection-rod -1,7l Heads with 42/35,5 valves ant optimised ports -double-valvesprings on the intakes -singel harder springs on the outtakes -56g TP-lifters And now, i`m not sure: -8.2:1 compression? and this parts i don`t know -turbocharger? garrett gt25? -camshaft? i like pauter-cams :D For the fuel-injektion, i`ve 2 double 42mm trottlesbodys with injektors I want from the engine a lot of power but driveable, from ~1700rpm to ~6500rpm must the engine be unbeliveable :D I hope someone understand my word and can help :) Best greetings von germany Title: Re: 1971ccm Street-Turbo-Typ4 need some ideas Post by: Peter on June 10, 2011, 18:49:35 pm hello,
i wish i could tell you, but dont have much experience myself.. I am building a turbo motor myself now, but i want it to turn more revs.. you have got to find the maps from the turbo and ask yourself how much power you want i found some good info on squirrel performance; they have a calculator based on engine size etc to give you an idea what turbo to take.. hope it helps a bit :) Title: Re: 1971ccm Street-Turbo-Typ4 need some ideas Post by: Torben Alstrup on June 10, 2011, 21:04:45 pm Definitely keep dual springs on both valves. - Especially if you use Pauter cams.
Depending on how high up you want max power, I would choose a Web 119 turbo or a 163 turbo. The latter can aid in the supply of over 300 hp out of a 2 liter if you make the combo right. CR. depends on how much you want to boost. - Say the 163 cam and 1 bar, 8,2 - 1 will be fine. If your chambers are perfect even 8,5 is possible. same cam/engine with 1,5 bar boost, and 8 - 1 is more like it. If you wanna pump 2 bar on it you need to reduce the CR to about 7,7 I think. (Havent made the math) Also, chose real 36 mm exh. valves instead of those cheapo 35,5 mm. Both valves and seats live longer. T Title: Re: 1971ccm Street-Turbo-Typ4 need some ideas Post by: volkskris on June 10, 2011, 21:52:35 pm talk to Armin Klein ;)
http://www.turboboxer.de/ (http://www.turboboxer.de/) Title: Re: 1971ccm Street-Turbo-Typ4 need some ideas Post by: Typ4-Boy on June 11, 2011, 10:41:57 am Hey,
thanks a lot, this are good informations. the next days i will read everything about turbomaps :) Then i can choose the turbo! And then i ask for the cam *g* But i don`t know why doublesprings on the exhaust-valves? Oh and i just want mendley valves, but you get mandleys just in 35,5 or 37,5 Greeting Title: Re: 1971ccm Street-Turbo-Typ4 need some ideas Post by: Torben Alstrup on June 11, 2011, 18:41:21 pm Yes I know. Step up and take either DelWest or Racemaster valves instead.
You do NOT want a floating exhaust valve in high rpm. The risk is not hitting a piston, but getting fuel mix out in the header under boost. Resulting in overheating the turbo hence failiure as a result. T Title: Re: 1971ccm Street-Turbo-Typ4 need some ideas Post by: Typ4-Boy on June 14, 2011, 19:43:31 pm Okey, now the engine ist almost ready, the compression ratio will be 8:1, the turbocharger will be a garret GT2871r with 71mm, 48trim, 0,60A/R. The cam will be a pauter turbo-grind.
Now the last thing witch makes me sure... how much boost pressure is good for daily driving? The Power i want from my engine is just at ~30psi! Its a lot, or? Greeting |