Isn't that Mahle technology very close to what Honda were doing in the 70's with CVCC? Honda were using a separate valve to provide the mixture to the pre-chamber though.
http://www.1stgencivic.org/1stgeneration_civic/photos/whatiscvcc7.jpg
Thanks for the eye-opener jsokal! I was dusting off the workpiece with compressed air but I guess particles could get embedded. Using alumina as a repellent is a new idea for me! What I was attempting to control the solder spread was actually to heat-oxidize the surface, mask and then grit blast...
I suspected the oxide problem from what I've been reading but I wasn't sure. It is the chromium that creates this passivation layer right? What confuses me is that even with a reducing gas (with hydrogen) I saw no discernible improvement.
I will definitely look into the active soldering alloys...
Pardon my possibly silly question but the following is a subject where I have little experience.
Due to other process limitations I have been forced to choose brazing/soldering to join thermocouple measuring points to stainless steel fittings (the thermocouples need to be gorunded).
A...
Warpspeed, you have caught my interest!
Yes, I'd like to design with low input voltage, very high output current. Inductance would have to be huge though to keep ripple small! (also, how small is small and how big is big???)
What I will try to build is a "box" to take input from a common MIG...
A (possibly foolish and overly ambitious) attempt to build a one-off high-current constant current source using the buck topology.
By high-current I mean electroplating/anodizing/TIG-welding currents (hence the above adjectives). I know these applications tolerate very high ripple currents but...
Hi,
Does anyone know where one can obtain a relatively large powdered iron core (preferably toroidal for EMI reasons and preferrably pretty cheap)? Everything I find on ebay is too small according to my limited knowledge/calculations and as far as I know buying single pieces in rather uncommon...
I have no idea what the term SFA means, but if tmoose meant "how far is camshaft timing from nominal" I haven't measured anything.
When the keyway was enlarged a year and a half ago the timing pulleys ended up offset a few degrees - I'd guess a few (less than 5) crankshaft degrees advanced with...
They are definitely unwilling to let go of the crankshaft! Had a beaten up Metro a couple of yers back, bought with a compression leak and managed to run (hard!) for a few months. I was going to change the block since I had a spare but had to give up because of the flywheel.
On the original...
I got my hands on the service manual which mentions a torque of just 80 ft lb for the bolt. It seems quite low compared to what people here have mentioned. I'll check the condition of the threads on the crank (those on the bolt are damaged) and if they're OK I'll risk tightening a bit more than...
Thanks to everybody for your advice and opinions.
I agree with the consensus that insufficient torque was the culprit.
I'll check if there's any damage to the crank but I'm a bit wary of machining it again - the keyway was already enlarged from 5 to 7 mm a year ago. And yes it costs a bit less...
Yes it could be harmonics, but on the other hand the repeat offender is a four cylinder which should run much smoother.
Damper and timing pulley are both stock, that's why I'm perplexed.
What's a good grade of loctite for such an application?
N
I am interested in understanding the reasons for failure of a woodruff key joining a crankshaft to the timing belt pulley. This has happened twice on the same engine and I would like to find a reliable solution.
The engine in question is a (late 80's) Japanese 1.3 litre inline four with dohc...
Thanks all for the input!
Piston speed at 9K works out at just under 14.9m/s which considering that this is not a race bike seems a reasonable limit.
Regarding the valvetrain I would have thought that the mass of the pushrods and the two rockers per valve would have detrimental effects. Now...
Other than destructive testing how would one go about determining the failure mode at extended high speed operation of an engine? (and the practical speed limit?)
The particular engine I'm thinking about (because I push it hard) is a 125cc single, 56.5x49.5mm bore and stroke, all ball/roller...
