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mc-engine@yahoogroups...
Jan 1, 2007 10:32 am
13047
... Hotting up the "metric" cruisers is now big business, rumors are that the 1600 Yamha Roadstar twin ( 4 valve heads ) can be coaxed to put out 120-125hp...
Ian
iwd@...
Jan 1, 2007 11:31 am
13048
... CV carbs are not as "responsive" to setting changes as direct pull carbs but at the end of the day the principles are all the same. Some CV's have an extra...
Ian
iwd@...
Jan 1, 2007 11:42 am
13049
On 01/01/07, Ian <iwd@...> wrote ... But not from a V-Rod, surely? 115 HP as std, IIRC. Otto...
... 4-valve chambers give their main benefit in width-of-powerband, essentially meaning--for a given peak horsepower rating--more LOW-END. I've read (perhaps...
It is not only difficult, it is likely to break the thing if you somehow succeed. I have seen five destroy their bottom ends at 110hp and the problem is ...
... Harley has positioned the V-Rod as a performance model. I have it on good authority that Yamaha spent a lot of time detuning their 1600 twin. It...
Ian
iwd@...
Jan 1, 2007 9:09 pm
13053
... But not from a V-Rod, surely? 115 HP as std, IIRC. ... And the Street Rod puts out 120hp - mostly from a different exhaust ? In the mega-engines stakes,...
RohanB
newboltz333@...
Jan 1, 2007 9:12 pm
13054
... Harley are very astute marketers, I'd guess it was designed as a 1300-1400cc motor. Starting at 1100 gives them somewhere to go and reduces warranty...
Ian
iwd@...
Jan 1, 2007 9:26 pm
13055
... size ... thanks but i really wanted some serious tech. i am already pulling 165 hp out of our v-rod on pump gas with a quickie port job. i was trying to...
... True ? That's impressive. ... Sorry, topics do tend to wander.............. Get ahold of Smith's "Scientific Design of Intake and Exhaust Systems". It's...
Ian
iwd@...
Jan 1, 2007 11:29 pm
13057
... i am already pulling 165 hp out of our v-rod on pump gas with a quickie port job. ... Wanna tell us how you tricked up the injection ?...
RohanB
newboltz333@...
Jan 2, 2007 6:39 am
13058
I am a small port guy within about a hundred limits but making ports bigger is not usually what works for me. I just increased the exhaust flow on a long ...
On 01/01/07, GeronimoPFudgemuffin@... ... The issue is not total port area, which is often no greater with 4 valves than with 2. The big difference is in...
Blair did a very useful paper titled 'Empiricism and Simulation in the Design of the High Performance Four-Stroke Engine' (SAE #983046) that has a lot of...
Hi Chris, Thanks for that. It turns out I've got a copy of it, but wasn't aware of it until I was prompted by your post to look for it. cheers, Michael...
Dan, You might be right that the slides are not exactly in the same position at the same rpm for differing throttle positions. However, I have found that ...
Ray, ... Actually I was saying that the cause of the slide carb tuning dilemma is the fact that there are many possible rpm for a given slide height. ... ...
... Derek, I don't think we really disagree, but the "whereas on a CV carb there is only one slide height for a given rpm" line got my attention. Besides, if...
Hi Michael I modelled (1/2) a TL1000R motor. I found a dyno plot from somewhere and persevered until I got a similar shape to the torque curve plot out of...
Hello all, The recent talk of ports and valves has led me to wonder what software the posters are using for engine simulation. I'm aware of only a few although...
this discussion and the website linked from it may be of interest to some. http://www.practicalmachinist.com/ubb/ultimatebb.php/topic/15/928. html cheers, ...
Hi guys, Back in the spring of 2003 I started working on a selftuning fuel injector modification device (well, back then the project started as a wideband...
Jim, It’s possible that the slide springs were too light on those CB350 carbs. However, if it ran right with the slide all of the way open from half the rpm...
Ian, I would say the exact opposite, since you can change the shape of the CO trace rather than just moving it up and down and/or canting it or the last few...
Julian, ... There are also wave phenomena that play into this. Typically the airbox is controlling reversion at some rpm that would otherwise cause big...
Howdy, It's for the Bonneville-bound 90cc pushrod Honda my buddies are building. We (they) are hoping to get around 10-grand out of it with a powerpeak...
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