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Hey guys, I've been working on this novel combustion cycle for the past 2 years and I recently presented the concept in Engine Expo in Stuttgart. Based on the responses that I got from the industry, I am not surprise if people are now thinking of building the prototype engines. Appreciate if...

I got confused a bit over the heat capacity of various gases. In my Bosch handbook, CO2 has cp of 0.82 and cv of 0.63. Nitrogen on the other hand has cp of 1.04 and cv of 0.74. From the property table it is clear that nitrogen has higher number if compared to CO2 but i am wondering on why many...

Anyone can verify the energy dissipated in braking an F1 car from 300km/h to 80km/h. Is it as high as 2000 kJ? Out of this 2000 kJ, how much can be recovered by KERS assuming that there is no limitation by FIA?

I need some reality check on whether my classical calculation is correct or not. I used some classical calculation that I got from a thermodynamics text book to calculate the work required to compress air. Scenario 1 40g/s of air being compressed at 3 bar Scenario 2 10g/s of air being...

Guys, I need to get an answer to a technical problem that I am having. I know that high sulfur fuel is very detrimental to 3 way catalyst and lean burn aftertreatment. Will the high sulfur fuel be detrimental to 2 way catalyst which removes only CO and HC? Will the formation of sulphate acts...

Hi everyone, I need some information on the items below: - 1) Compressed CNG from a high pressure tank at 200 bar, 25 degree C being injected into an engine cylinder through a DI injector. No regulator to bring down the feed pressure. What will be the temperature of the methane gas right after...

Hey guys, I know that FFV can run easily with ethanol, will it be possible to run FFV with M85 or M100 too?

Hi guys, I have this crazy idea about igniting diesel at around 10 bar with 1000K temperature in a bomb calorimeter. Do you guys think that this is possible? what will be the effect to ignition delay?

Hi, Is there anyone out there having an excel or simulation program which can calculate the exhaust mass flow rate going out of a cylinder for an engine with two 18-19mm diameter exhaust valve. I know that it involves a lot of variables but I am more interested in term of the overall range in...

Hey guys, I now have two cases of severe diesel knock that led to partial destruction of piston, head and block. Both the engines have the injectors removed and assembled again. Both engines have also accumulated quite a high mileage. One engine is an IDI and another one is a DI. I just want...

I am having a tough time to find the biggest CNG injector. I figure out that the biggest CNG injector can either be for truck or industrial applications. Is there anyone out there that can help me out in term of maximum flow and the injector dimension.

I am looking for cylinder pressure during induction stroke for an average NA engine? I am guessing that the vacuum is at its most when the piston reaches its maximum speed somewhere in the middle of the stroke.

Hey guys, I am not a material engineer. I need some help here, Test condition 1 Engine part made out of high silicone Aluminum is subjected to X MPa of stress for 5 hours until it failed. Test condition 2 Same engine part, subjected to 0.8X MPa of stress for 60 hours. Once the 60 hours of...

Guys, Is there any article that I can get from the internet that clearly shows the differences between tailpipe emission in Japan, US and Europe. I also need to compare the test cycle and sampling procedures. Thanks in advance

Everyone I am not a calibrator or electronic engineer, however, I need to conduct a study regarding the use of Motec ECU for conventional engine. I understand that Motec ECU is strong in term of aftermarket applications like racing or hot rod. However, I need to find out on whether Motec ECU...

Hi everyone, I came across the BMW M5 engine management system. It is kinda interesting how the ECU limits the maximum engine rev during cold start to 4000rpm only. Anyway, I am looking for the possibility in using the ECU to limit the engine rpm during -30 C cold start. My question is, at...

Hello everyone, I am looking for some information on the engine friction data at extremely cold temperature. It would also be helpful if there is also information about the friction difference using different oil viscosity grade. Thank you in advance.

Hi Guys, I have few questions here. I'm pretty sure that others in the industry have encountered the water pump cavitation problems during the engine testing and development. My question is, with the cavitation occuuring, does it actually lower the heat transfer to the head and block...

Gentlemen, I havent heard about Plasma exhaust aftertreatment for quite sometime. It has drawbacks for example, high power requirement, expensive, etc. However, I am pretty sure that the problems have solutions. With the emergence of 42v electrical system, tougher future emission...