What is the thermal efficiency of the compression stroke of the otto 4 cycle engine? For this question we will consider the motion of the piston from BDC to TDC, for simplicity we will assume no valve overlap and that both the intake and exhaust valves are closed when the piston starts coming up...
Hi Dicasto
Thank you for being the first poster to answer the question I posted back in June. Yes I was talking about termal efficiency. What is your source for a PD(postive Displacement) piston type compressor having a thermal efficiency of 82% at compression ratio’s below 3 to 1?
What...
Fabiom75
What kind of oil are you using? I recall in another forum, a similar problem, the problem went away when they changed to a non detergent synthetic oil. Apparently a lot of modern synthetic oils, especially the ones that advertise a long duration between oil changes have too much...
What is the thermal efficiency of an IC engine, strictly as an air pump? Turbochargers typically have a quoted efficiency of 90%, modern roots superchargers(Eaton) have a max of about 60%, a twin screw supercharger(Lysholm, Autorotor) is a little better, at about 70%.
Charles Taylor’s “The...
Hi Dave
Well I don’t have the precise answer for you, but cluchless upshifts are why people use dog engagement transmissions in the first place. Almost all racing motorcycles, and a lot of street ones upshift without the clutch. As I understand it, a downshift produces more stress on a...
Hi 2autoX
High dollar race engines are routinely preheated before startup to avoid the wear you speak of. This is done by using quick connect/disconnect fittings on the engine coolant hoses. The hoses are then connected to an electric immersion heater with a built in pump that heats the engine...
Hi
I’m looking for some guidance on building an individual throttle per cylinder setup for a street legal 60 degree V6 motor.
How should I size the throttle plates ? The motor has one intake valve and one exhaust valve, and electronic port fuel injection. The intake valve is 44mm. I’m assuming...
Joe
Tell us a little more about this engine. Is it a 60 degree V6? Does it have three crank throws(shared crankpin) or six crank throws(one crankpin per cylibder)?
Hi Antti
To get back to your original question about “Big Bang Motors” I hope the following section is of some interest.
It is from the Nov/Dec 1992 issue of the U.S. motorcycle magazine Road Racing World. The article was entitled “Shaking the Foundations of Our Universe” by Peter Clifford...
Hi Morewing
Thanks for your post. While I like the Adams book I have always had my doubts about it, for instance on page(p.35) he recommends cutting off one coil of a coil spring. All the other books, articles, about suspension modification I have read, condemn this practice.
Are you familiar...
MNRaptor
Can you tell us more about these spun rod bearings? Is it always the same rod journal that spins? Do you have an oiling diagram of this engine? and if so can you post it some where?
Do you still have the damaged bearings and/or rods? I read an article a long time ago which showed how...
Hi Guys
Thanks for the response. Okay here are my responses and some new questions
Responses
“What rule limits it to 25%?”
“…but a value of about 25% is about the practical limit. This compares to a well designed live rear axle rear suspension which often has over 100% anti-squat.” P.74 of...
Okay, first a dumb question and then hopefully a less dumb question, both about anti squat.
First question: Lots of references are made to anti squat in terms of percentage like 40% or 100%. But what does the percentage refer to? The total weight of the car? just the weight carried by the back...
Well, I don’t quite understand your objection to the common set up where the lower triple clamp carries all or most of the weight. But as to your question why this setup is so popular; I think the answer has to do with ease of adjustability/maintenance of the steering stem bearings.
On most...
