What would a ball park figure for seat pressure be for small valves ? Head 30 mm and stem 5.5 mm for usage up to 13000 RPM. I know it depends on a range of...
... That's pure off road motorcycle porn !! 2 things amaze me about this video : - That they can get so far in 10 years, whilst there has obviously been a lot...
Ian
iwd@...
May 6, 2009 11:59 pm
15825
... 50 lbs is a good starting point for a 30mm valve, you are right, 80 lb + is for big valves ( usually 2 valve head 500's etc ). Cheers IAN See...
Ian
iwd@...
May 7, 2009 6:54 am
15826
Thanks for the reply Ian. I searched the web and my books and could not find anything more on this, however, when all else fails, read the manual. I have read...
You lately posted a curve to me, but didn't answer if that was a valve lift, or a somehow measured cam lift curve (what it seemed to be). With the right...
... I've played around with valve spring strengths a bit, the amazing thing is that you can hear the difference on the dyno, the engine sounds "crisper", even...
Ian
iwd@...
May 7, 2009 12:53 pm
15831
I was going to say the same thing. A cam train analysis software will tell you all you need. I had significant valve float when putting the higher performance...
The Honda has rockers with curved cam followers. The geometry changes depending on the valve length and base circle which make calculating things difficult. It...
Wallace, there is no need to calculate rocker/lobe/valve-geometry. You have to measure the valve lift curve, the movement the VALVE does, (not cam!) best would...
I have just installed an oil pressure gauge on my Honda 150. Same motor as all the XLl185 XL200 CB125 etc from 20 years ago. As I added an oil cooler, I...
I don't have a number but a friend has a triumph cub and a honda XR100. To check flow to the cub head and with engine running, he opened an oil line and oil...
I'm sorry Wallace, I'd like to be of help but I really couldn't see which one of the fourteen Wartsila-Sulzer RTA96-C conrods you bent. Would it be possible...
Howdy Blacky, glad to see you in here. How long have you been on this list? How's the Gamma project progressing? Have a nice week buddy Cheers Carsten...
... It's simple, really. Not worth it to straighten a little rod like that. You just pull a new one out of your spares kit, and off you go. They do come...
Has anyone had experience with damage to motorcycle engines from being flooded in muddy water? I would think after Katrina, for instance, this would come up,...
Paul Clark
paulcl@...
May 11, 2009 10:22 am
15842
Decades ago I had the opportunity to disassemble a 4-stroke that had been ran with valve grinding compound in the oil until it quit. It was as clean as could...
The Honda's do not have a oil pressure release valve. After a few more trials I started the motor. 100 plus PSI oil pressure at fast idle, 20 seconds later the...
Am I missing something here? Hondas of this type have roller bearing bigends, don't they? I'd've thought getting even 10psi would have been unlikely. Jordan ...
... Hi Jordan, AFAIK XL250 and 500 get their BE-rollers lubricated through oil collecting rings, so they can use pressure for the head. Cheers, Hans...
After some discussion the following may be an answer. The Honda does not have a pressure release valve and the oil flow is controlled by hole sizes feeding the...
Thanks Hans, I hadn't realised the plain bearing surfaces were pressure lubricated. I remember thinking, when the otherwise excellent XL250 came out, that the...
... At full noise, many of the roller brg engines will raise 30-35 psi, even though they only need 5-10 psi to operate. As mentioned, they don't usually run...
Ian
iwd@...
May 14, 2009 6:30 am
15849
Jordan <jwprincic@...> Wed, 13 May 2009 22:29:17 ... I had an XL500 for a while and fitted an CB250RS cam as it was a bit more aggressive. The 250RS...
http://thenewcaferacersociety.blogspot.com/2009/03/1985-was-on-way.html A month ago I was lucky to shoot the full article, original cut out of an "Cycle Guide"...
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