... If you've got access to a dyno and are worried only in modifying stuff after the collectors, the best way to do it is to set it on the dyno and make run...
Reliability and cost of maintenance and rebuilds are driving customers away from the newer four strokes. A Friend in the UK said that 70% of the participants...
... Agreed, they're a mechanics dream. You regularly hear stories about owners who get less than an hour's riding ( in dust ) before having to get the head...
Ian
iwd@...
Jul 2, 2009 12:52 am
16031
Well you can't buy a two stroke here, more or less, but as we are considering adding a modern 4 stroke ( like > year 2000 ) to the stable, I'd like to hear a...
... XR400's are holding their resale value very well in Australia, this is partly because it's a Honda but mostly because they aren't as fragile is the latest...
Ian
iwd@...
Jul 2, 2009 3:14 am
16033
... here too, just starting to drop below $3000, worth more than XR600s and almost as much as an XR650R. As far as I can tell you can't kill them. ... OK that...
When the first of the fourstroke MX bikes first came out, everyone jumped onboard. Even I retired my CR250 based Supermoto in the interest of riding a CRF450....
... Starting to ?? They were hand grenades from day one here, sent more than one dealer down the tubes trying to keep up with warranty - one owner had 2 new...
Ian
iwd@...
Jul 2, 2009 4:52 am
16036
What are the issues with the aprilia engines? ... Starting to ?? They were hand grenades from day one here, sent more than one dealer down the tubes trying to...
... Crank failures due to oiling problems. One fix was to replace the O ring that joined the LH & RH oil galleries, BUT only if the engine had not been started...
Ian
iwd@...
Jul 2, 2009 5:26 am
16038
Well, there's not many here, and they don't get ridden that hard. but it has been a ticking clock waiting for them to explode. The early cases didn't have...
Brake Specfic Fuel Consumption Assuming one has all his carburetion/timing ducks in a nice row (healthy, well-tuned engine), given these three RPM waypoints: ...
I can hardly find fi 38 as bends but there is 5/4" or 1" tube. If i choose the diameter for the new exhaust that little different for the new 4-in-2 part,...
AFAIK best *specific* fuel consumption generally (always?) occurs at peak torque, and in fact the BSFC curve is roughly a mirror image of the torque curve. ...
Are you sure you aren't confusing BSFC with BMEP ? BSFC is Brake Specific Fuel Consumption which seems independent to torque whereas BMEP is Brake Mean...
Nope. BMEP is what produces torque. There is a direct relationship. BSFC is fuel per bhp per hour (in old units) and is the true efficiency. It is tends to ...
... Brake Specfic Fuel Consumption Assuming one has all his carburetion/timing ducks in a nice row (healthy, well-tuned engine), given these three RPM...
RohanB
newboltz333@...
Jul 2, 2009 11:11 pm
16046
Otto, This doesn't address your original question and I have never done any BSFC testing and I am also curious about it so consider this: We agree that BMEP =...
Good discussion and examples, although not motorcycle... <http://autospeed.com.au/cms/title_Brake-Specific-Fuel-Consumption/A_110216/ article.html>...
RohanB
newboltz333@...
Jul 3, 2009 12:06 am
16048
... You can't go from 38mm ( 1.5" ) to 32 or 25 and expect to maintain the same power output, you need to get as close as possible to existing size and then...
Ian
iwd@...
Jul 3, 2009 12:16 am
16049
... You'll often see the Chinese & Indian motorcycle manufacturers supply these figures. Cheers IAN See www.drysdalev8.com for : - Drysdale 750-V8...
Ian
iwd@...
Jul 3, 2009 12:39 am
16050
snipped and bottom posted ... ======================================================== Even at The best BSFC rpm, the BSFC is rotten at low throttle settings. ...
Especially with an over capacity but under used spark ignition gasoline engine your air specific efficiency will be terrible. What is required to make BSFC...
Pumping losses are indeed lower at lower rotational speeds but aerodynamic resistance is also less at lower crankshaft and vehicle speeds by the second order,...
I am have a good hunch all motorcycle engineers care...! And in some forms of racing it is critical..! You often see the techno gurus at a NASCAR, Indy...
A mate is contemplating using the longer stroke crank from the '90 model L GSXR 750 in the earlier short stroke '88 model J engine to give a capacity of about...
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